Gelvam A Hartmann

Biographic Data

ID1643402
NAMEGelvam A Hartmann
GIVEN NAMESGelvam A
FAMILY NAMEHartmann
SIGNATUREHARTMANN G A
AFFILIATIONSUniversidade Estadual de Campinas (UNICAMP)
ORCID0000-0001-6078-3893
VERIFIEDYes
TOTAL WORKS6
TOTAL CITATIONS5
WORKS AS AUTHOR6
WORKS AS EDITOR0
FIRST PUBLICATION YEAR2007
LATEST PUBLICATION YEAR2022
H-INDEX2

  • Quaternary ironstones in the Xingu River, eastern Amazonia (Brazil)

    Open AccessMarília Prado Freire, Ana Maria Góes et al.ARTICLEQuaternary Research2022

    Using a multimethod approach, including polarized light microscopy (PLM), scanning electron microscopy (SEM) with X-ray energy dispersive spectroscopy (EDS), SEM with mineral liberation analyzer (MLA), X-ray diffraction (XRD), and Raman spectroscopy, we examined sub-recent ferruginous crusts in the Xingu River in the Amazon Basin that have formed since the Early Pleistocene (

  • Formation Processes of the Late Pleistocene Site Toca da Janela da Barra do Antonião – Piauí (Brazil)

    Ximena S Villagrán, Gelvam A Hartmann et al.ARTICLEPaleoAmerica2021Cited by: 2References: 12

    Archaeological research of late Pleistocene sites in northeastern Brazil has rarely analyzed site formation processes from a geoarchaeological perspective. This has contributed to the long-held debate over the reliability of Pleistocene ages and the anthropic origin of stone tools and combustion features. In this work, we combine high-resolution geoarchaeological methods to study the formation processes of the Toca da Janela da Barra do Antonião …

  • The response of a dune succession from Lençóis Maranhenses, NE Brazil, to climate changes between MIS 3 and MIS 2

    Open AccessAndré Zular, André O Sawakuchi et al.ARTICLEQuaternary International2020

  • Revisiting Alice Boer

    Open AccessAstolfo Gomes De Mello Araujo, J K Feathers et al.ARTICLEGeoarchaeology2020Cited by: 1References: 29

    The Alice Boer site, located in Southeastern Brazil, was considered to be one of the oldest sites in the Americas, and a strong candidate for being a pre‐Clovis site. Ages obtained by researchers during the 1970s and 1980s put the site inside a chronological range between 2 and 14 ka, eventually reaching as old as 30 ka or even 130 ka. Between 2010 and 2012, our research team revisited the site to improve the knowledge of Paleoindian occupation i…

  • The “Lagoa do Camargo 1” Paleoindian site

    Open AccessAstolfo Gomes De Mello Araujo, Julio Cesar Paisani et al.ARTICLEGeoarchaeology2017Cited by: 2References: 8

    Lagoa do Camargo 1, a Paleoindian archaeological site located in southeast Brazil dated between 10.5 and 8.3 ka, was studied using a variety of analyses: artifact and charcoal frequencies, soil morphology and micromorphology, magnetic analysis, optically stimulated luminescence, and radiocarbon dating. Our results show that the sandy tropical Oxisol present at the site was accumulated by episodic erosion and accumulation of materials along the sl…

  • Arqueomagnetismo e datação arqueomagnética

    Open AccessGelvam A Hartmann, Marisa Coutinho Afonso et al.ARTICLERevista do Museu de Arqueologia e…2007

    O campo magnético da Terra oscila em várias escalas de tempo tanto em direção quanto em intensidade. As oscilações na escala de tempo arqueológico (1,7X 103 a 1X104 anos) são de origem interna (no núcleo externo, líquido e condutor), têm abrangência regional (~200.000 km2) e correspondem à parte das variações seculares do campo geomagnético. O estudo dessas variações em diferentes partes do globo permite construir curvas de referência. Quando bem…