Mieczysław F Pazdur
Dados Biográficos
| ID | 5597045 |
|---|---|
| NOME | Mieczysław F Pazdur |
| PRENOMES | Mieczysław F |
| SOBRENOME | Pazdur |
| ASSINATURA | PAZDUR M F |
| AFILIAÇÕES | Institute of Physics, Silesian Politechnic, Gliwice, Poland |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 32 |
| TOTAL DE CITAÇÕES | 134 |
| TOTAL COMO AUTOR | 32 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1978 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 1996 |
| ÍNDICE H | 7 |
Lake-level and groundwater-level changes in the Lake Gosciąż area, Poland
Lake Gosciąz is located in the zone of the maximum extent of the last ice sheet. Distinct lake terraces and deposits related to the lateglacial transgression do not exist. Detailed examination of annually laminated sediments and landforms revealed three phases of higher water level and storage, represented by shore features, by littoral, deltaic and bog deposits, and by higher rates of lacustrine deposition in the pelagic zone. Holocene lake tran…
A Data Acquisition System for Proportional Counters at Gliwice
We present here the principal ideas of a new, fully computerized data acquisition system with pulse-rise background reduction, developed in the Gliwice Radiocarbon Laboratory, and our first results. The new system uses a microprocessor-controlled pulse and coincidence analyzer for acquisition of data from 3 of 4 proportional counter sets. The analyzer acquires and stores information on the pulse's amplitudes and rise-times and their coincidence w…
Radiocarbon and Thermoluminescence Studies of the Karst Pipe Systems in Southwest England and South Wales
Paleokarst forms in raised beach deposits of Southwest England and South Wales and generally known as “pipes” were dated by 14 C and thermoluminescence (TL) methods. Current geological opinion is that these pipes are features that developed under the cover of periglacial-solifluctional deposits due to periglacial conditions prevalent in the Late Devensian. In the present study, TL was used to determine the age of quartz grains forming the raised …
Ecological Chronology of Nuclear Fuel Cycle Sites
We compared 14 C levels in annual growth rings of pine trees around the Tomsk nuclear fuel reprocessing plant (NFRP) and the Chernobyl nuclear power plant (NPP). At the Chernobyl site, samples were taken from the control area (within a 30-km radius zone around the site) to a distance of 80 km. In Tomsk, we collected samples between 8–10 km and 10–15 km from the site, taking into account prevailing wind directions. Background samples were collecte…
A Computer-Based Database for Radiocarbon Dates of Central Andean Archaeology
We established a database of 14 C dates from archaeological sites of the Central Andes region of Peru, Ecuador and Bolivia on an IBM PC-compatible microcomputer running on an MS-DOS operating system using software package dBASE IV, version 1.1. Relevant data are stored in three DBF-type database files. The file ANDY.DBF contains information on dates and samples; REFERENC.DBF contains references to relevant publications and CALAND.DBF contains cal…
The Younger Dryas Cold Event—Was It Synchronous Over the North Atlantic Region
Determined independently from annually laminated ice cores and lake sediments, and German pines, the calendar ages of Younger Dryas (YD) boundaries significantly disagree with one another. 14 C dates, plotted vs. calendar ages for samples from different sediments, also reveal distinct offsets. The adjustment of varve chronologies to synchronize the boundaries of the YD nearly cancels the discrepancies between 14 C data, and supports the synchroni…
Paleoclimatic Implications of Radiocarbon Dating Of Speleothems from the Cracow-Wieluń Upland, Southern Poland
We report preliminary results of a long-term systematic study intended to gather paleoclimatic records from precisely dated speleothems. The research project is limited to speleothems deposited in caves of the Cracow-Wieluń Upland, the largest and best-explored karst region in Poland, covering ca . 2900 km 2 with >1000 caves. Speleothem samples were selected from collections of the Geological Museum of the Academy of Mining and Metallurgy in Crac…
Gliwice Radiocarbon Dates XI
The following list presents results of dating archaeological samples from Poland processed between 1979 and 1985. Three carbon dioxide-filled proportional counters (L1, L2 and L3) of different sizes were used for dating (Pazdur et al. 1982). Procedures for sample pretreatment, counting, statistical analysis and age calculations were essentially the same as previously described (Pazdur et al. 1982, 1985). All results are reported as conventional 1…
Gliwice Radiocarbon Dates Xii
The following list presents results of dating archaeological samples from excavations in Africa. Most results reported in this list were obtained from 1982 to 1993 for international research projects studying the origin and early development of food-producing cultures in northeastern Africa, including the Nile basin and the Sahara. Detailed information on these projects may be found in the series of conference proceedings edited by Krzyżaniak and…
Jablines Le Haut Château (Seine-et-Marne)
Ce volume est le premier de la série « Archéologie et grands travaux », créée au sein des DAF afin d’accueillir les publications des opérations de sauvetage de grande ampleur, et en majeure partie financée par les responsables de ces aménagements en milieu rural et urbain. Découvert à l’occasion des fouilles effectuées préalablement à la construction de la ligne d’interconnexion des TGV, le site de Jablines a révélé une mine néolithique de silex …
Possibilities for Reconstructing Radiocarbon Level Changes During the Late Glacial by Using a Laminated Sequence of Gościaż Lake
Laminated sediments of Gościaż Lake can be used as an independent source of material for calibrating the radiocarbon time scale. The varve chronology is based on three long cores from the deepest part of the lake, with one additional core from the second deepest part. From pollen and Cladocera spectra and stable isotope and chemical content sequences, we have determined the Allerød(AL)/Younger Dryas(YD) and Younger Dryas/Preboreal(PB) boundaries …
Holocene deltaic sequence in the Saloum estuary, Senegal
The 2250 km 2 Saloum delta, south of Dakar, Senegal, consists of a Holocene sedimentary sequence deposited during five evolutionary stages: submerged postglacial ria, funnel-like estuary, barred estuary, cuspate delta, and reverse estuary. The passage from one stage to another was marked by the deposition of sedimentary units consisting of shelly sands, silty or sandy clays, and an extensive thick green mud. Muds in the lower strata, dating betwe…
Systematic Biases in Results of the International Collaborative Study and Their Probable Sources
Results of the International Collaborative Study show an unexpectedly large scatter of individual dates as well as systematic biases. Very high values of linear correlation coefficients are observed for all results of Stage 2 and for benzene samples of Stage 1. We observed moderate correlations for carbonate samples and the lowest for natural samples of wood and peat of Stage 3. The correlation is practically negligible among results obtained in …
Further Investigations on 14 C Dating of Calcareous Tufa
Systematic studies on 14 C dating of tufa profiles in southern Poland have resulted in developing a simple phenomenological model which enables us to estimate the reservoir correction factor of 14 C dates of individual carbonate samples. We made further studies to test model assumptions and to verify relationships between the value of reservoir correction factor T R and 13 C content of tufa carbonate. Two new study sites, Rudawa and Szklarka, are…
Radiocarbon and Varve Chronologies of Annually Laminated Lake Sediments of Gościαz Lake, Central Poland
A sequence of annually laminated sediments of the Gościαz Lake spans ca 13,000 yr and is actually the longest known continuous sequence in the world. 14 C age measurements were performed on organic and carbonate fractions of bulk samples of laminated sediments from core GO. Accurate measurements of varve thickness performed on the lower part of cores G1 and G2 were used to establish a floating varve chronology covering ca 10,000 yr. Matching of c…
Improvement of the Procedure for Probabilistic Calibration of Radiocarbon Dates
A set of computer procedures for probabilistic calibration of 14 C dates was developed at the Gliwice Radiocarbon Laboratory for the IBM PC compatible microcomputer. The program comprises three main options: 1) calibration of a single 14 C date, 2) calibration of a set of arbitrary dates, 3) calibration of a set of related dates. Results of calibration are presented in the form of graphs and numeric data, including tables of selected quantiles an…
Improved Precision 14C Measurements and Natural 14C Variations Around 10,000 Cal BP
Thirty-one samples of 5 tree rings from a single oak trunk with 300 tree rings were measured with improved precision to study natural 14 C variations in the period from ca 9750 – 10,050 cal bp. Negative correlation was found between Δ 14 C values and tree-ring indices. The pattern of 14 C changes in the studied interval closely resembles the changes observed in several periodically spanned intervals within the limits of high-precision calibration…
Stable Isotopes of Holocene Calcareous Tufa in Southern Poland as Paleoclimatic Indicators
The isotopic composition of oxygen in freshwater calcareous tufa seems to be a sensitive indicator of past climatic changes. Results of measurements of δ c 18 O and δ c 13 C in tufa samples dated with the 14 C method are used to reconstruct Holocene climatic changes in southern Poland. Values of δ c 18 O obtained on tufa samples from four sites (Raclawka, Rzerzuŝnia, Trzebienice, Sieradowice) representing different hydrodynamic conditions of tufa…
Radiocarbon Dating of Holocene Calcareous Tufa in Southern Poland
Calcareous tufa from five sites in southern Poland, representing several most typical conditions of tufa sedimentation, were chosen for 14 C, 13 C, and 18 O measurements. These tufas were deposited in a high-energy turbulent stream (the Racławka site), in streams with moderate but variable flow (Rzerzuśnia and Trzebienice), and in semilimnic conditions (Sieradowice site). Sediments of the Gliczarów site represent spring travertines. In all but th…
Drastic Increase of Background in the Gliwice Radiocarbon Laboratory During Late April, 1986, and its Time Changes
Preliminary observations of changes of the background of three proportional counters during May and June, 1986, are presented. Some isotopes contributing to the rise of background were identified on the basis of their half-life determinations
C Dating of Calcareous Tufa from Different Environments
14 C dates of carbonate and organic matter fractions are compared with a series of calcareous tufa samples from selected sites representing different geochemical environments and associated with different bedrocks. Results obtained in this study indicate values of apparent age ranging from 940 ± 110 yr for calcareous tufas associated with Pleistocene sediments to 2000 ± 110 yr and even ca 4000 yr for tufas from sites associated with Jurassic or C…
Early Slavonic Settlements and Navigation at the Mouth of the Odra River
An attempt is presented to establish an absolute chronology of early Slavonic habitation in the region of the mouth of the Odra River up to the Baltic and to find associations with a series of stave boats and dugouts of different levels of technology and navigation. The methodology of the research project is presented and some conclusions of a general nature are drawn from the results already obtained
Regional Suess Effect in the Upper Silesia Urban Area
The study of a regional Suess effect is based on three sets of samples of atmospheric CO 2 : 1) a series of samples collected at the same site in Gliwice from 1980 to 1984, 2) samples collected simultaneously at different sites within the limits of an urban and industrial region of Upper Silesia, and 3) samples collected simultaneously outside this region along an eastern direction. Results of 14 C concentration measurements show systematic decre…
Contamination Studies on Mollusk Shell Samples
A series of shell samples has been studied to determine the magnitude and mechanisms of carbon exchange between shells and their environment. Laboratory contamination experiments included the storing of shell samples in acid and calcareous environments of different 14 C concentrations as well as studies of carbon exchange in the course of thermal recrystallization in solid state in an atomosphere of carbon dioxide. The applicability of differenti…
Gliwice Radiocarbon Dates X
The following list contains all age measurements of paleoenvironmental samples made from 1978 to the end of 1982 for the IGCP 158 Project “Paleohydrological changes in the temperate zone in the last 15,000 years,” Subproject B “Lake and mire environments” (Berglund, 1979), initiated by Bjorn Berglund and Leszek Starkel in 1976. The aim of this project was to reconstruct environmental changes related to climate and human activity in the temperate …
Improvement of the Procedure for Probabilistic Calibration of Radiocarbon Dates
A set of computer procedures for probabilistic calibration of 14 C dates was developed at the Gliwice Radiocarbon Laboratory for the IBM PC compatible microcomputer. The program comprises three main options: 1) calibration of a single 14 C date, 2) calibration of a set of arbitrary dates, 3) calibration of a set of related dates. Results of calibration are presented in the form of graphs and numeric data, including tables of selected quantiles an…
Contamination Studies on Mollusk Shell Samples
A series of shell samples has been studied to determine the magnitude and mechanisms of carbon exchange between shells and their environment. Laboratory contamination experiments included the storing of shell samples in acid and calcareous environments of different 14 C concentrations as well as studies of carbon exchange in the course of thermal recrystallization in solid state in an atomosphere of carbon dioxide. The applicability of differenti…
Radiocarbon Dating of Holocene Calcareous Tufa in Southern Poland
Calcareous tufa from five sites in southern Poland, representing several most typical conditions of tufa sedimentation, were chosen for 14 C, 13 C, and 18 O measurements. These tufas were deposited in a high-energy turbulent stream (the Racławka site), in streams with moderate but variable flow (Rzerzuśnia and Trzebienice), and in semilimnic conditions (Sieradowice site). Sediments of the Gliczarów site represent spring travertines. In all but th…
Regional Suess Effect in the Upper Silesia Urban Area
The study of a regional Suess effect is based on three sets of samples of atmospheric CO 2 : 1) a series of samples collected at the same site in Gliwice from 1980 to 1984, 2) samples collected simultaneously at different sites within the limits of an urban and industrial region of Upper Silesia, and 3) samples collected simultaneously outside this region along an eastern direction. Results of 14 C concentration measurements show systematic decre…
Paleoclimatic Implications of Radiocarbon Dating Of Speleothems from the Cracow-Wieluń Upland, Southern Poland
We report preliminary results of a long-term systematic study intended to gather paleoclimatic records from precisely dated speleothems. The research project is limited to speleothems deposited in caves of the Cracow-Wieluń Upland, the largest and best-explored karst region in Poland, covering ca . 2900 km 2 with >1000 caves. Speleothem samples were selected from collections of the Geological Museum of the Academy of Mining and Metallurgy in Crac…
Possibilities for Reconstructing Radiocarbon Level Changes During the Late Glacial by Using a Laminated Sequence of Gościaż Lake
Laminated sediments of Gościaż Lake can be used as an independent source of material for calibrating the radiocarbon time scale. The varve chronology is based on three long cores from the deepest part of the lake, with one additional core from the second deepest part. From pollen and Cladocera spectra and stable isotope and chemical content sequences, we have determined the Allerød(AL)/Younger Dryas(YD) and Younger Dryas/Preboreal(PB) boundaries …
Gliwice Radiocarbon Dates VII
The following list contains the measurements of archaeologic samples made during 1978 and 1979 using carbon-dioxide-filled proportional counters. Most of the samples were dated with counter No. 3 (L3) filled to 1 or 2 atm pressure (Mościcki and Zastawny, 1977). Our counter No. 1 (L1) previously described (Mościcki and Zastawny, 1976) has been remounted and is now operating at 2 atm pressure of carbon dioxide. Samples measured with this counter ha…
Gliwice Radiocarbon Dates IV
All samples described in this date list have been measured since July 1973 to Oct 1975 using carbon dioxide filled proportional counters. Most of samples have been dated with Counter No. 1 (LI) as in our previous list (Mościcki and Zastawny, 1976). Some samples were measured with Counter No. 3 (L3), with a total volume of 1.51 and background and NBS oxalic acid standard counting rate of respectively, 3.50 or 4.00 cpm and 10.05 or 20.40 cpm when f…
A Computer-Based Database for Radiocarbon Dates of Central Andean Archaeology
We established a database of 14 C dates from archaeological sites of the Central Andes region of Peru, Ecuador and Bolivia on an IBM PC-compatible microcomputer running on an MS-DOS operating system using software package dBASE IV, version 1.1. Relevant data are stored in three DBF-type database files. The file ANDY.DBF contains information on dates and samples; REFERENC.DBF contains references to relevant publications and CALAND.DBF contains cal…
The Younger Dryas Cold Event—Was It Synchronous Over the North Atlantic Region
Determined independently from annually laminated ice cores and lake sediments, and German pines, the calendar ages of Younger Dryas (YD) boundaries significantly disagree with one another. 14 C dates, plotted vs. calendar ages for samples from different sediments, also reveal distinct offsets. The adjustment of varve chronologies to synchronize the boundaries of the YD nearly cancels the discrepancies between 14 C data, and supports the synchroni…
Jablines Le Haut Château (Seine-et-Marne)
Ce volume est le premier de la série « Archéologie et grands travaux », créée au sein des DAF afin d’accueillir les publications des opérations de sauvetage de grande ampleur, et en majeure partie financée par les responsables de ces aménagements en milieu rural et urbain. Découvert à l’occasion des fouilles effectuées préalablement à la construction de la ligne d’interconnexion des TGV, le site de Jablines a révélé une mine néolithique de silex …
Gliwice Radiocarbon Dates V
Most of the dates reported in this list were obtained between November 1975 and December 1976. All samples were subjected to standard de Vries pretreatment. Age calculations are based on a contemporary value equal to 0.95 of the activity of NBS oxalic acid standard and on the Libby value for the half-life of radiocarbon. Results are reported as conventional radiocarbon dates in years before ad 1950. All measurements were made with our L1 counter …
Gliwice Radiocarbon Dates XI
The following list presents results of dating archaeological samples from Poland processed between 1979 and 1985. Three carbon dioxide-filled proportional counters (L1, L2 and L3) of different sizes were used for dating (Pazdur et al. 1982). Procedures for sample pretreatment, counting, statistical analysis and age calculations were essentially the same as previously described (Pazdur et al. 1982, 1985). All results are reported as conventional 1…
C Dating of Calcareous Tufa from Different Environments
14 C dates of carbonate and organic matter fractions are compared with a series of calcareous tufa samples from selected sites representing different geochemical environments and associated with different bedrocks. Results obtained in this study indicate values of apparent age ranging from 940 ± 110 yr for calcareous tufas associated with Pleistocene sediments to 2000 ± 110 yr and even ca 4000 yr for tufas from sites associated with Jurassic or C…
Lake-level and groundwater-level changes in the Lake Gosciąż area, Poland
Lake Gosciąz is located in the zone of the maximum extent of the last ice sheet. Distinct lake terraces and deposits related to the lateglacial transgression do not exist. Detailed examination of annually laminated sediments and landforms revealed three phases of higher water level and storage, represented by shore features, by littoral, deltaic and bog deposits, and by higher rates of lacustrine deposition in the pelagic zone. Holocene lake tran…
Ecological Chronology of Nuclear Fuel Cycle Sites
We compared 14 C levels in annual growth rings of pine trees around the Tomsk nuclear fuel reprocessing plant (NFRP) and the Chernobyl nuclear power plant (NPP). At the Chernobyl site, samples were taken from the control area (within a 30-km radius zone around the site) to a distance of 80 km. In Tomsk, we collected samples between 8–10 km and 10–15 km from the site, taking into account prevailing wind directions. Background samples were collecte…
Radiocarbon and Varve Chronologies of Annually Laminated Lake Sediments of Gościαz Lake, Central Poland
A sequence of annually laminated sediments of the Gościαz Lake spans ca 13,000 yr and is actually the longest known continuous sequence in the world. 14 C age measurements were performed on organic and carbonate fractions of bulk samples of laminated sediments from core GO. Accurate measurements of varve thickness performed on the lower part of cores G1 and G2 were used to establish a floating varve chronology covering ca 10,000 yr. Matching of c…
Gliwice Radiocarbon Dates X
The following list contains all age measurements of paleoenvironmental samples made from 1978 to the end of 1982 for the IGCP 158 Project “Paleohydrological changes in the temperate zone in the last 15,000 years,” Subproject B “Lake and mire environments” (Berglund, 1979), initiated by Bjorn Berglund and Leszek Starkel in 1976. The aim of this project was to reconstruct environmental changes related to climate and human activity in the temperate …
Gliwice Radiocarbon Dates IX
The following list contains most of the measurements of geologic samples made during 1979 and 1980 using carbon-dioxide-filled proportional counters. Samples with laboratory numbers > 1000 were counted with counter No. 1 (L1), and those with numbers
Gliwice Radiocarbon Dates VI
Results presented in this date list have been obtained from Jan 1977 to Dec 1977, but some earlier measurements are also included. All calculations are based on a contemporary value equal to 0.95 of the activity of NBS oxalic acid standard and on the Libby value for the half-life of radiocarbon. Ages are reported as conventional radiocarbon dates in years before AD 1950. No corrections for 13 C/ 12 C ratio were made for measurements reported in t…
A Data Acquisition System for Proportional Counters at Gliwice
We present here the principal ideas of a new, fully computerized data acquisition system with pulse-rise background reduction, developed in the Gliwice Radiocarbon Laboratory, and our first results. The new system uses a microprocessor-controlled pulse and coincidence analyzer for acquisition of data from 3 of 4 proportional counter sets. The analyzer acquires and stores information on the pulse's amplitudes and rise-times and their coincidence w…
Gliwice Radiocarbon Dates Xii
The following list presents results of dating archaeological samples from excavations in Africa. Most results reported in this list were obtained from 1982 to 1993 for international research projects studying the origin and early development of food-producing cultures in northeastern Africa, including the Nile basin and the Sahara. Detailed information on these projects may be found in the series of conference proceedings edited by Krzyżaniak and…
Drastic Increase of Background in the Gliwice Radiocarbon Laboratory During Late April, 1986, and its Time Changes
Preliminary observations of changes of the background of three proportional counters during May and June, 1986, are presented. Some isotopes contributing to the rise of background were identified on the basis of their half-life determinations
Gliwice Radiocarbon Dates VIII
The following list sums up the results of radiocarbon dating of geologic samples obtained mostly during 1978 and 1979. Measurements have continued with the same proportional counters, pretreatment procedures, carbon dioxide purification, measurement and calculation as described previously (Pazdur et al , 1982). Ages are reported as conventional radiocarbon dates in years before ad 1950. No corrections for 13 C/ 12 C ratio were made for samples re…
Age Reporting of Very Old Samples
Problems of the statistical interpretation of radiocarbon age measurements of old samples are discussed, based on the notion of fiducial probability distribution. A probability density function of age has been given. A detailed discussion of different facets of the probability distribution of age has led us to the confirmation of the use of 2σ as the best limiting value between the regions of finite and infinite dates. It has been proposed to mak…
Gliwice Radiocarbon Dates IV
All samples described in this date list have been measured since July 1973 to Oct 1975 using carbon dioxide filled proportional counters. Most of samples have been dated with Counter No. 1 (LI) as in our previous list (Mościcki and Zastawny, 1976). Some samples were measured with Counter No. 3 (L3), with a total volume of 1.51 and background and NBS oxalic acid standard counting rate of respectively, 3.50 or 4.00 cpm and 10.05 or 20.40 cpm when f…
Gliwice Radiocarbon Dates V
Most of the dates reported in this list were obtained between November 1975 and December 1976. All samples were subjected to standard de Vries pretreatment. Age calculations are based on a contemporary value equal to 0.95 of the activity of NBS oxalic acid standard and on the Libby value for the half-life of radiocarbon. Results are reported as conventional radiocarbon dates in years before ad 1950. All measurements were made with our L1 counter …
Age Reporting of Very Old Samples
Problems of the statistical interpretation of radiocarbon age measurements of old samples are discussed, based on the notion of fiducial probability distribution. A probability density function of age has been given. A detailed discussion of different facets of the probability distribution of age has led us to the confirmation of the use of 2σ as the best limiting value between the regions of finite and infinite dates. It has been proposed to mak…
Gliwice Radiocarbon Dates VI
Results presented in this date list have been obtained from Jan 1977 to Dec 1977, but some earlier measurements are also included. All calculations are based on a contemporary value equal to 0.95 of the activity of NBS oxalic acid standard and on the Libby value for the half-life of radiocarbon. Ages are reported as conventional radiocarbon dates in years before AD 1950. No corrections for 13 C/ 12 C ratio were made for measurements reported in t…
Gliwice Radiocarbon Dates VII
The following list contains the measurements of archaeologic samples made during 1978 and 1979 using carbon-dioxide-filled proportional counters. Most of the samples were dated with counter No. 3 (L3) filled to 1 or 2 atm pressure (Mościcki and Zastawny, 1977). Our counter No. 1 (L1) previously described (Mościcki and Zastawny, 1976) has been remounted and is now operating at 2 atm pressure of carbon dioxide. Samples measured with this counter ha…
Gliwice Radiocarbon Dates VIII
The following list sums up the results of radiocarbon dating of geologic samples obtained mostly during 1978 and 1979. Measurements have continued with the same proportional counters, pretreatment procedures, carbon dioxide purification, measurement and calculation as described previously (Pazdur et al , 1982). Ages are reported as conventional radiocarbon dates in years before ad 1950. No corrections for 13 C/ 12 C ratio were made for samples re…
Gliwice Radiocarbon Dates IX
The following list contains most of the measurements of geologic samples made during 1979 and 1980 using carbon-dioxide-filled proportional counters. Samples with laboratory numbers > 1000 were counted with counter No. 1 (L1), and those with numbers
Contamination Studies on Mollusk Shell Samples
A series of shell samples has been studied to determine the magnitude and mechanisms of carbon exchange between shells and their environment. Laboratory contamination experiments included the storing of shell samples in acid and calcareous environments of different 14 C concentrations as well as studies of carbon exchange in the course of thermal recrystallization in solid state in an atomosphere of carbon dioxide. The applicability of differenti…
Gliwice Radiocarbon Dates X
The following list contains all age measurements of paleoenvironmental samples made from 1978 to the end of 1982 for the IGCP 158 Project “Paleohydrological changes in the temperate zone in the last 15,000 years,” Subproject B “Lake and mire environments” (Berglund, 1979), initiated by Bjorn Berglund and Leszek Starkel in 1976. The aim of this project was to reconstruct environmental changes related to climate and human activity in the temperate …
C Dating of Calcareous Tufa from Different Environments
14 C dates of carbonate and organic matter fractions are compared with a series of calcareous tufa samples from selected sites representing different geochemical environments and associated with different bedrocks. Results obtained in this study indicate values of apparent age ranging from 940 ± 110 yr for calcareous tufas associated with Pleistocene sediments to 2000 ± 110 yr and even ca 4000 yr for tufas from sites associated with Jurassic or C…
Early Slavonic Settlements and Navigation at the Mouth of the Odra River
An attempt is presented to establish an absolute chronology of early Slavonic habitation in the region of the mouth of the Odra River up to the Baltic and to find associations with a series of stave boats and dugouts of different levels of technology and navigation. The methodology of the research project is presented and some conclusions of a general nature are drawn from the results already obtained
Regional Suess Effect in the Upper Silesia Urban Area
The study of a regional Suess effect is based on three sets of samples of atmospheric CO 2 : 1) a series of samples collected at the same site in Gliwice from 1980 to 1984, 2) samples collected simultaneously at different sites within the limits of an urban and industrial region of Upper Silesia, and 3) samples collected simultaneously outside this region along an eastern direction. Results of 14 C concentration measurements show systematic decre…
Drastic Increase of Background in the Gliwice Radiocarbon Laboratory During Late April, 1986, and its Time Changes
Preliminary observations of changes of the background of three proportional counters during May and June, 1986, are presented. Some isotopes contributing to the rise of background were identified on the basis of their half-life determinations
Stable Isotopes of Holocene Calcareous Tufa in Southern Poland as Paleoclimatic Indicators
The isotopic composition of oxygen in freshwater calcareous tufa seems to be a sensitive indicator of past climatic changes. Results of measurements of δ c 18 O and δ c 13 C in tufa samples dated with the 14 C method are used to reconstruct Holocene climatic changes in southern Poland. Values of δ c 18 O obtained on tufa samples from four sites (Raclawka, Rzerzuŝnia, Trzebienice, Sieradowice) representing different hydrodynamic conditions of tufa…
Radiocarbon Dating of Holocene Calcareous Tufa in Southern Poland
Calcareous tufa from five sites in southern Poland, representing several most typical conditions of tufa sedimentation, were chosen for 14 C, 13 C, and 18 O measurements. These tufas were deposited in a high-energy turbulent stream (the Racławka site), in streams with moderate but variable flow (Rzerzuśnia and Trzebienice), and in semilimnic conditions (Sieradowice site). Sediments of the Gliczarów site represent spring travertines. In all but th…
Radiocarbon and Varve Chronologies of Annually Laminated Lake Sediments of Gościαz Lake, Central Poland
A sequence of annually laminated sediments of the Gościαz Lake spans ca 13,000 yr and is actually the longest known continuous sequence in the world. 14 C age measurements were performed on organic and carbonate fractions of bulk samples of laminated sediments from core GO. Accurate measurements of varve thickness performed on the lower part of cores G1 and G2 were used to establish a floating varve chronology covering ca 10,000 yr. Matching of c…
Improvement of the Procedure for Probabilistic Calibration of Radiocarbon Dates
A set of computer procedures for probabilistic calibration of 14 C dates was developed at the Gliwice Radiocarbon Laboratory for the IBM PC compatible microcomputer. The program comprises three main options: 1) calibration of a single 14 C date, 2) calibration of a set of arbitrary dates, 3) calibration of a set of related dates. Results of calibration are presented in the form of graphs and numeric data, including tables of selected quantiles an…
Improved Precision 14C Measurements and Natural 14C Variations Around 10,000 Cal BP
Thirty-one samples of 5 tree rings from a single oak trunk with 300 tree rings were measured with improved precision to study natural 14 C variations in the period from ca 9750 – 10,050 cal bp. Negative correlation was found between Δ 14 C values and tree-ring indices. The pattern of 14 C changes in the studied interval closely resembles the changes observed in several periodically spanned intervals within the limits of high-precision calibration…
Systematic Biases in Results of the International Collaborative Study and Their Probable Sources
Results of the International Collaborative Study show an unexpectedly large scatter of individual dates as well as systematic biases. Very high values of linear correlation coefficients are observed for all results of Stage 2 and for benzene samples of Stage 1. We observed moderate correlations for carbonate samples and the lowest for natural samples of wood and peat of Stage 3. The correlation is practically negligible among results obtained in …
Further Investigations on 14 C Dating of Calcareous Tufa
Systematic studies on 14 C dating of tufa profiles in southern Poland have resulted in developing a simple phenomenological model which enables us to estimate the reservoir correction factor of 14 C dates of individual carbonate samples. We made further studies to test model assumptions and to verify relationships between the value of reservoir correction factor T R and 13 C content of tufa carbonate. Two new study sites, Rudawa and Szklarka, are…
Holocene deltaic sequence in the Saloum estuary, Senegal
The 2250 km 2 Saloum delta, south of Dakar, Senegal, consists of a Holocene sedimentary sequence deposited during five evolutionary stages: submerged postglacial ria, funnel-like estuary, barred estuary, cuspate delta, and reverse estuary. The passage from one stage to another was marked by the deposition of sedimentary units consisting of shelly sands, silty or sandy clays, and an extensive thick green mud. Muds in the lower strata, dating betwe…
Jablines Le Haut Château (Seine-et-Marne)
Ce volume est le premier de la série « Archéologie et grands travaux », créée au sein des DAF afin d’accueillir les publications des opérations de sauvetage de grande ampleur, et en majeure partie financée par les responsables de ces aménagements en milieu rural et urbain. Découvert à l’occasion des fouilles effectuées préalablement à la construction de la ligne d’interconnexion des TGV, le site de Jablines a révélé une mine néolithique de silex …
Possibilities for Reconstructing Radiocarbon Level Changes During the Late Glacial by Using a Laminated Sequence of Gościaż Lake
Laminated sediments of Gościaż Lake can be used as an independent source of material for calibrating the radiocarbon time scale. The varve chronology is based on three long cores from the deepest part of the lake, with one additional core from the second deepest part. From pollen and Cladocera spectra and stable isotope and chemical content sequences, we have determined the Allerød(AL)/Younger Dryas(YD) and Younger Dryas/Preboreal(PB) boundaries …
Gliwice Radiocarbon Dates XI
The following list presents results of dating archaeological samples from Poland processed between 1979 and 1985. Three carbon dioxide-filled proportional counters (L1, L2 and L3) of different sizes were used for dating (Pazdur et al. 1982). Procedures for sample pretreatment, counting, statistical analysis and age calculations were essentially the same as previously described (Pazdur et al. 1982, 1985). All results are reported as conventional 1…
Gliwice Radiocarbon Dates Xii
The following list presents results of dating archaeological samples from excavations in Africa. Most results reported in this list were obtained from 1982 to 1993 for international research projects studying the origin and early development of food-producing cultures in northeastern Africa, including the Nile basin and the Sahara. Detailed information on these projects may be found in the series of conference proceedings edited by Krzyżaniak and…
Geology (27 obras) · Radiocarbon dating (27 obras) · Paleontology (20 obras) · Geography (16 obras) · Geology and Paleoclimatology Research (15 obras) · Archaeology (14 obras) · Chemistry (13 obras) · Mineralogy (11 obras) · Physical geography (10 obras) · Archaeology and ancient environmental studies (9 obras)