Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México

The Losero Formation is exposed in the Guanajuato Mining District, conformably overlying the Guanajuato conglomerate. Most of the up-to-date studies of the Losero Formation have indicated that this formation corresponds to a Cenozoic volcanic sequence. Howe - ver, sedimentological, petrographic and...

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Autores: María Jesús Puy-Alquiza, Raúl Miranda-Aviles, Maricela Cruz-Cruz, Ofelia Pérez-Arbizu, Marina Vega-González, Gabriela Ana-Zanor
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Redalyc-UNAM
OAI Identifier:oai:redalyc.org:94332984001
Acceso en línea:https://www.redalyc.org/articulo.oa?id=94332984001
Access Level:acceso abierto
Palabra clave:Ciencias de la Tierra
Guanajuato
Provenance
Geochemistry
Losero Formation
Tectonic setting
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spelling Geochemistry and depositional environment of the Losero Formation in the Mesa Central, MéxicoMaría Jesús Puy-AlquizaRaúl Miranda-AvilesMaricela Cruz-CruzOfelia Pérez-ArbizuMarina Vega-GonzálezGabriela Ana-ZanorCiencias de la TierraGuanajuatoProvenanceGeochemistryLosero FormationTectonic settingThe Losero Formation is exposed in the Guanajuato Mining District, conformably overlying the Guanajuato conglomerate. Most of the up-to-date studies of the Losero Formation have indicated that this formation corresponds to a Cenozoic volcanic sequence. Howe - ver, sedimentological, petrographic and geochemical evidence that supports a sedimentary or volcanic origin has not been discussed extensively. We present a comprehensive geological analysis which includes collection of samples and elaboration of eight stratigraphic columns, followed by laboratory studies including petrography, trace element determinations using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and mineralogy by X-ray diffraction and Scanning Electron Microscopy (SEM). The petrographic analysis revealed that the Losero Formation is constituted by litharenite and arkose, mostly derived from granitic and metamorphic basement rocks typical of the interior of a craton. Primary sedimentary structures include ripples, antidunes, Àute and groove casts, cross and parallel lamination, desiccation cracks and soft-sediment deformation structures interpreted as seismites. These ¿ndings demonstrate that the sandstones were deposited by supercritical and subcritical Àows as well as by unidirectional Àows within channels and bars in a river system. Elemental ratios critical of provenance (La/Sc, Th/Sc, La/Cr, Th/Cr and Ba/Sc) are similar to sediments derived from weathering of mostly felsic rocks. Using QmFLt and QtFL ternary diagrams allowed to infer that the sandstones of the Losero Formation were deposited in an active continental margin. Modal analysis of the samples indicates a recycled orogen and dissected arc. Most evidence suggests that the deposit was accumulated in a Àuvial environment with conditions ranging from shallow to deep water. Based on these data and ¿eld observations, the sandstones from the Losero Formation can be considered as part of the distal facies of the Guanajuato Conglomerate.Sociedad Geológica Mexicana, A.C.2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf1405-3322https://www.redalyc.org/articulo.oa?id=94332984001Boletín de la Sociedad Geológica Mexicana (México) Num.3 Vol.66reponame:Redalyc-UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenhttp://www.redalyc.org/revista.oa?id=943Boletín de la Sociedad Geológica Mexicanainfo:eu-repo/semantics/openAccessoai:redalyc.org:943329840012025-09-03T18:09:01Z
dc.title.none.fl_str_mv Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
title Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
spellingShingle Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
María Jesús Puy-Alquiza
Ciencias de la Tierra
Guanajuato
Provenance
Geochemistry
Losero Formation
Tectonic setting
title_short Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
title_full Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
title_fullStr Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
title_full_unstemmed Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
title_sort Geochemistry and depositional environment of the Losero Formation in the Mesa Central, México
dc.creator.none.fl_str_mv María Jesús Puy-Alquiza
Raúl Miranda-Aviles
Maricela Cruz-Cruz
Ofelia Pérez-Arbizu
Marina Vega-González
Gabriela Ana-Zanor
author María Jesús Puy-Alquiza
author_facet María Jesús Puy-Alquiza
Raúl Miranda-Aviles
Maricela Cruz-Cruz
Ofelia Pérez-Arbizu
Marina Vega-González
Gabriela Ana-Zanor
author_role author
author2 Raúl Miranda-Aviles
Maricela Cruz-Cruz
Ofelia Pérez-Arbizu
Marina Vega-González
Gabriela Ana-Zanor
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
Guanajuato
Provenance
Geochemistry
Losero Formation
Tectonic setting
topic Ciencias de la Tierra
Guanajuato
Provenance
Geochemistry
Losero Formation
Tectonic setting
description The Losero Formation is exposed in the Guanajuato Mining District, conformably overlying the Guanajuato conglomerate. Most of the up-to-date studies of the Losero Formation have indicated that this formation corresponds to a Cenozoic volcanic sequence. Howe - ver, sedimentological, petrographic and geochemical evidence that supports a sedimentary or volcanic origin has not been discussed extensively. We present a comprehensive geological analysis which includes collection of samples and elaboration of eight stratigraphic columns, followed by laboratory studies including petrography, trace element determinations using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and mineralogy by X-ray diffraction and Scanning Electron Microscopy (SEM). The petrographic analysis revealed that the Losero Formation is constituted by litharenite and arkose, mostly derived from granitic and metamorphic basement rocks typical of the interior of a craton. Primary sedimentary structures include ripples, antidunes, Àute and groove casts, cross and parallel lamination, desiccation cracks and soft-sediment deformation structures interpreted as seismites. These ¿ndings demonstrate that the sandstones were deposited by supercritical and subcritical Àows as well as by unidirectional Àows within channels and bars in a river system. Elemental ratios critical of provenance (La/Sc, Th/Sc, La/Cr, Th/Cr and Ba/Sc) are similar to sediments derived from weathering of mostly felsic rocks. Using QmFLt and QtFL ternary diagrams allowed to infer that the sandstones of the Losero Formation were deposited in an active continental margin. Modal analysis of the samples indicates a recycled orogen and dissected arc. Most evidence suggests that the deposit was accumulated in a Àuvial environment with conditions ranging from shallow to deep water. Based on these data and ¿eld observations, the sandstones from the Losero Formation can be considered as part of the distal facies of the Guanajuato Conglomerate.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 1405-3322
https://www.redalyc.org/articulo.oa?id=94332984001
identifier_str_mv 1405-3322
url https://www.redalyc.org/articulo.oa?id=94332984001
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv http://www.redalyc.org/revista.oa?id=943
dc.rights.none.fl_str_mv Boletín de la Sociedad Geológica Mexicana
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Boletín de la Sociedad Geológica Mexicana
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedad Geológica Mexicana, A.C.
publisher.none.fl_str_mv Sociedad Geológica Mexicana, A.C.
dc.source.none.fl_str_mv Boletín de la Sociedad Geológica Mexicana (México) Num.3 Vol.66
reponame:Redalyc-UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
institution UNAM
reponame_str Redalyc-UNAM
collection Redalyc-UNAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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