Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico

Islas Marías archipelago is located 110 km NW of San Blas, Nayarit in the mouth of the Gulf of California. The archipelago is formed by San Juanito, María Madre, María Magdalena, and María Cleofas islands. The position of these islands represents a key point for paleogeographic and paleotectonic rec...

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Detalhes bibliográficos
Autores: Valerie Pompa-Mera, Peter Schaaf, Teodoro Hernández-Treviño, Bodo Weber, Gabriela Solís-Pichardo, Daniel Villanueva-Lascurain, Paul Layer
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2013
País:México
Recursos:Universidad Nacional Autónoma de México
Repositório:Redalyc-UNAM
OAI Identifier:oai:redalyc.org:57226227003
Acesso em linha:https://www.redalyc.org/articulo.oa?id=57226227003
Access Level:Acceso aberto
Palavra-chave:Ciencias de la Tierra
Mexico
Geochemistry
geochronology
paleogeography
Isla María Madre
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spelling Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, MexicoValerie Pompa-MeraPeter SchaafTeodoro Hernández-TreviñoBodo WeberGabriela Solís-PichardoDaniel Villanueva-LascurainPaul LayerCiencias de la TierraMexicoGeochemistrygeochronologypaleogeographyIsla María MadreIslas Marías archipelago is located 110 km NW of San Blas, Nayarit in the mouth of the Gulf of California. The archipelago is formed by San Juanito, María Madre, María Magdalena, and María Cleofas islands. The position of these islands represents a key point for paleogeographic and paleotectonic reconstructions of northwestern Mexico and of the tectonic evolution of Baja California Peninsula. María Madre is the largest island and covers an area of 145 km2. This study presents the first detailed geological map of the island together with geochemical and geochronological data of its lithological units. Isolated basement rocks are exposed along the western coast in the form of migmatites and orthogneisses of granodioritic to granitic compositions and middle Jurassic ages (163 - 170 Ma). In the west-central part, a metasedimentary sequence, with biotite ± garnet paragneisses and folded calcsilicate rocks with or without garnet bands of unknown ages, is exposed as a roof pendant of the underlying Cretaceous intrusions (80.8 - 83.4 Ma) of tonalitic to granitic compositions. These granitoids are cut by mafic and pegmatitic dikes. We named the overall assemblage of metamorphic and plutonic rocks as "Papelillo Complex" due to the predominant outcrops in the homonymous canyon. The Papelillo Complex is overlain by ignimbrites, volcanic breccias, and lava flows of rhyolitic compositions. 40Ar/39Ar geochronology in sanidines from these rocks yielded Cretaceous (71.6 – 80.6 Ma) and Tertiary (55.4 Ma) ages, suggesting contemporaneous volcanic and plutonic activity. This inference is confirmed by similar REE patterns in both units with typical distributions for a subduction-related magmatic arc environment. Towards the east, the igneous sequence is covered by Late Miocene to Pleistocene? marine and shallow marine deposits and towards the south by an Early Miocene? clastic continental sequence (informally named Isla Magdalena sandstone). Marine and shallow marine sediments were informally named "Ojo de Buey sequence" and subdivided into a lower and an upper member. Detrital zircon ages from both units display major peaks at ca. 83 Ma, indicating sedimentation mainly from plutonic and volcanic rocks of the same age. In the Ojo de Buey sequence, no zircons younger than Late Cretaceous were found. The Isla Magdalena sandstone, instead, shows a prominent peak at ~22 Ma, suggesting detritus from a different igneous source. The lithologies of Isla María Madre are similar to those from the Los Cabos Block in Baja California Sur and from central Sinaloa. The overall area forms part of a Cretaceous plutonic belt, which definitely rules out large latitudinal displacements for the southern Baja California Peninsula.Universidad Nacional Autónoma de México2013info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf1026-8774https://www.redalyc.org/articulo.oa?id=57226227003Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.30reponame:Redalyc-UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenhttp://www.redalyc.org/revista.oa?id=572Revista Mexicana de Ciencias Geológicasinfo:eu-repo/semantics/openAccessoai:redalyc.org:572262270032025-09-03T18:07:17Z
dc.title.none.fl_str_mv Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
title Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
spellingShingle Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
Valerie Pompa-Mera
Ciencias de la Tierra
Mexico
Geochemistry
geochronology
paleogeography
Isla María Madre
title_short Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
title_full Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
title_fullStr Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
title_full_unstemmed Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
title_sort Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
dc.creator.none.fl_str_mv Valerie Pompa-Mera
Peter Schaaf
Teodoro Hernández-Treviño
Bodo Weber
Gabriela Solís-Pichardo
Daniel Villanueva-Lascurain
Paul Layer
author Valerie Pompa-Mera
author_facet Valerie Pompa-Mera
Peter Schaaf
Teodoro Hernández-Treviño
Bodo Weber
Gabriela Solís-Pichardo
Daniel Villanueva-Lascurain
Paul Layer
author_role author
author2 Peter Schaaf
Teodoro Hernández-Treviño
Bodo Weber
Gabriela Solís-Pichardo
Daniel Villanueva-Lascurain
Paul Layer
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
Mexico
Geochemistry
geochronology
paleogeography
Isla María Madre
topic Ciencias de la Tierra
Mexico
Geochemistry
geochronology
paleogeography
Isla María Madre
description Islas Marías archipelago is located 110 km NW of San Blas, Nayarit in the mouth of the Gulf of California. The archipelago is formed by San Juanito, María Madre, María Magdalena, and María Cleofas islands. The position of these islands represents a key point for paleogeographic and paleotectonic reconstructions of northwestern Mexico and of the tectonic evolution of Baja California Peninsula. María Madre is the largest island and covers an area of 145 km2. This study presents the first detailed geological map of the island together with geochemical and geochronological data of its lithological units. Isolated basement rocks are exposed along the western coast in the form of migmatites and orthogneisses of granodioritic to granitic compositions and middle Jurassic ages (163 - 170 Ma). In the west-central part, a metasedimentary sequence, with biotite ± garnet paragneisses and folded calcsilicate rocks with or without garnet bands of unknown ages, is exposed as a roof pendant of the underlying Cretaceous intrusions (80.8 - 83.4 Ma) of tonalitic to granitic compositions. These granitoids are cut by mafic and pegmatitic dikes. We named the overall assemblage of metamorphic and plutonic rocks as "Papelillo Complex" due to the predominant outcrops in the homonymous canyon. The Papelillo Complex is overlain by ignimbrites, volcanic breccias, and lava flows of rhyolitic compositions. 40Ar/39Ar geochronology in sanidines from these rocks yielded Cretaceous (71.6 – 80.6 Ma) and Tertiary (55.4 Ma) ages, suggesting contemporaneous volcanic and plutonic activity. This inference is confirmed by similar REE patterns in both units with typical distributions for a subduction-related magmatic arc environment. Towards the east, the igneous sequence is covered by Late Miocene to Pleistocene? marine and shallow marine deposits and towards the south by an Early Miocene? clastic continental sequence (informally named Isla Magdalena sandstone). Marine and shallow marine sediments were informally named "Ojo de Buey sequence" and subdivided into a lower and an upper member. Detrital zircon ages from both units display major peaks at ca. 83 Ma, indicating sedimentation mainly from plutonic and volcanic rocks of the same age. In the Ojo de Buey sequence, no zircons younger than Late Cretaceous were found. The Isla Magdalena sandstone, instead, shows a prominent peak at ~22 Ma, suggesting detritus from a different igneous source. The lithologies of Isla María Madre are similar to those from the Los Cabos Block in Baja California Sur and from central Sinaloa. The overall area forms part of a Cretaceous plutonic belt, which definitely rules out large latitudinal displacements for the southern Baja California Peninsula.
publishDate 2013
dc.date.none.fl_str_mv 2013
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 1026-8774
https://www.redalyc.org/articulo.oa?id=57226227003
identifier_str_mv 1026-8774
url https://www.redalyc.org/articulo.oa?id=57226227003
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=572
dc.rights.none.fl_str_mv Revista Mexicana de Ciencias Geológicas
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Revista Mexicana de Ciencias Geológicas
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México
publisher.none.fl_str_mv Universidad Nacional Autónoma de México
dc.source.none.fl_str_mv Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.30
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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score 14,964248

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