Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition

Bed II is a critical part of early Pleistocene Olduvai Gorge, Tanzania. Its deposits include transitions from humid to more arid conditions (with associated faunal changes), from Homo habilis to erectus, and from Oldowan to Acheulean technology. Bed II (~ 1.8–1.2 Ma) is stratigraphically and environ...

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Autores: McHenry, Lindsay J., Njau, Jackson K., Torre Sainz, Ignacio de la, Pante, Michael C.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/357199
Acceso en línea:http://hdl.handle.net/10261/357199
Access Level:acceso abierto
Palabra clave:Olduvai Gorge
Tephrostratigraphy
Tephrochronology
Pleistocene
Acheulean
Oldowan
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spelling Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transitionMcHenry, Lindsay J.Njau, Jackson K.Torre Sainz, Ignacio de laPante, Michael C.Olduvai GorgeTephrostratigraphyTephrochronologyPleistoceneAcheuleanOldowanBed II is a critical part of early Pleistocene Olduvai Gorge, Tanzania. Its deposits include transitions from humid to more arid conditions (with associated faunal changes), from Homo habilis to erectus, and from Oldowan to Acheulean technology. Bed II (~ 1.8–1.2 Ma) is stratigraphically and environmentally complex, with facies changes, faulting, and unconformities, making site-to-site correlation over the ~ 20 km of exposure difficult. Bed II tuffs are thinner, less evenly preserved, and more reworked than those of Bed I. Five marker tuffs (Tuffs IIA–IID, Bird Print Tuff (BPT)), plus local tephra, were collected from multiple sites and characterized using stratigraphic position, mineral assemblage, and electron probe microanalysis of phenocryst (feldspar, hornblende, augite, titanomagnetite) and glass (where available) composition. Lowermost Bed II tuffs are dominantly nephelinitic, Middle Bed II tuffs (BPT, Tuff IIC) have basaltic components, and upper Bed II Tuff IID is trachytic. The BPT and Tuff IID are identified widely using phenocryst compositions (high-Ca plagioclase and high-Ti hornblende, respectively), though IID was originally (Hay, 1976) misidentified as Tuff IIC at Loc 91 (SHK Annexe) in the Side Gorge. This work helps establish a high-resolution basin-wide paleolandscape context for the Oldowan–Acheulean transition and helps link hominin, faunal and archaeological records.This research was funded by grants from NSF (BCS-0852292 to McHenry), the L.S.B. Leakey Foundation, the University of Wisconsin-Milwaukee Research Growth Initiative, and the European Research Council (Starting Grants-283366 to de la Torre).Peer reviewedCambridge University PressNational Science Foundation (US)Leakey FoundationUniversity of Wisconsin-MilwaukeeEuropean CommissionTorre Sainz, Ignacio de la [0000-0002-1805-634X]202420242016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/357199reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/FP7/283366https://doi.org/10.1016/j.yqres.2015.10.005Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3571992026-05-22T06:33:51Z
dc.title.none.fl_str_mv Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
title Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
spellingShingle Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
McHenry, Lindsay J.
Olduvai Gorge
Tephrostratigraphy
Tephrochronology
Pleistocene
Acheulean
Oldowan
title_short Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
title_full Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
title_fullStr Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
title_full_unstemmed Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
title_sort Geochemical «fingerprints» for Olduvai Gorge Bed II tuffs and implications for the Oldowan-Acheulean transition
dc.creator.none.fl_str_mv McHenry, Lindsay J.
Njau, Jackson K.
Torre Sainz, Ignacio de la
Pante, Michael C.
author McHenry, Lindsay J.
author_facet McHenry, Lindsay J.
Njau, Jackson K.
Torre Sainz, Ignacio de la
Pante, Michael C.
author_role author
author2 Njau, Jackson K.
Torre Sainz, Ignacio de la
Pante, Michael C.
author2_role author
author
author
dc.contributor.none.fl_str_mv National Science Foundation (US)
Leakey Foundation
University of Wisconsin-Milwaukee
European Commission
Torre Sainz, Ignacio de la [0000-0002-1805-634X]
dc.subject.none.fl_str_mv Olduvai Gorge
Tephrostratigraphy
Tephrochronology
Pleistocene
Acheulean
Oldowan
topic Olduvai Gorge
Tephrostratigraphy
Tephrochronology
Pleistocene
Acheulean
Oldowan
description Bed II is a critical part of early Pleistocene Olduvai Gorge, Tanzania. Its deposits include transitions from humid to more arid conditions (with associated faunal changes), from Homo habilis to erectus, and from Oldowan to Acheulean technology. Bed II (~ 1.8–1.2 Ma) is stratigraphically and environmentally complex, with facies changes, faulting, and unconformities, making site-to-site correlation over the ~ 20 km of exposure difficult. Bed II tuffs are thinner, less evenly preserved, and more reworked than those of Bed I. Five marker tuffs (Tuffs IIA–IID, Bird Print Tuff (BPT)), plus local tephra, were collected from multiple sites and characterized using stratigraphic position, mineral assemblage, and electron probe microanalysis of phenocryst (feldspar, hornblende, augite, titanomagnetite) and glass (where available) composition. Lowermost Bed II tuffs are dominantly nephelinitic, Middle Bed II tuffs (BPT, Tuff IIC) have basaltic components, and upper Bed II Tuff IID is trachytic. The BPT and Tuff IID are identified widely using phenocryst compositions (high-Ca plagioclase and high-Ti hornblende, respectively), though IID was originally (Hay, 1976) misidentified as Tuff IIC at Loc 91 (SHK Annexe) in the Side Gorge. This work helps establish a high-resolution basin-wide paleolandscape context for the Oldowan–Acheulean transition and helps link hominin, faunal and archaeological records.
publishDate 2016
dc.date.none.fl_str_mv 2016
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/357199
url http://hdl.handle.net/10261/357199
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/FP7/283366
https://doi.org/10.1016/j.yqres.2015.10.005
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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