The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization

Gravity and seismic studies enabled us to establish the major features of the shallow crustal structure beneath Chichinautzin Range. Accordingly, the Chichinautzin Range evolved above Mesozoic calcareous rocks lying on a metamorphic basement. To the north and south this basement is downfaulted. Neve...

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Autores: José Oscar Campos-Enríquez, Javier Francisco Lermo-Samaniego, Yanet Teresa Antayhua-Vera, Marcos Chavacán, Victor-Manuel Ramón-Márquez
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Redalyc-UNAM
OAI Identifier:oai:redalyc.org:94340680013
Acceso en línea:https://www.redalyc.org/articulo.oa?id=94340680013
Access Level:acceso abierto
Palabra clave:Ciencias de la Tierra
seismicity
Mexico Basin
Chichinautzin Range
Aztlán Fault System
shallow crustal model
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spelling The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterizationJosé Oscar Campos-EnríquezJavier Francisco Lermo-SamaniegoYanet Teresa Antayhua-VeraMarcos ChavacánVictor-Manuel Ramón-MárquezCiencias de la TierraseismicityMexico BasinChichinautzin RangeAztlán Fault Systemshallow crustal modelGravity and seismic studies enabled us to establish the major features of the shallow crustal structure beneath Chichinautzin Range. Accordingly, the Chichinautzin Range evolved above Mesozoic calcareous rocks lying on a metamorphic basement. To the north and south this basement is downfaulted. Nevertheless the north dipping faults downward displace the basement to larger depths (2 to 3 km) in the Mexico and Toluca basins. In the Morelos Basin, the basin is shallower. As block-faulting evolved, the basement edge migrated southwards, thus widening an E-W oriented major depression south of the Mexico Basin. In particular, gravity modeling enabled us to integrate the different faults mapped up to today in and around the Chichinautzin Range into a fault system that can be correlated from the Nevado de Toluca. This system will be referred to collectively as the Aztlán Fault System. The Xicomulco, Aztec (central and major fault) and La Pera faults are featured by seismicity. Orientation and dips obtained from simple and composite mechanisms indicate NW-SE to N-S extension with minor E-W left-lateral movement. In particular, seismicity extends down to the brittle-ductile transition crustal zone (maximum hypocentral depths of about 15 km) but consequently the major faults, considering their length, should reach lower crustal levels (approximately 40 km). This system is a major active fault system of at least 100 km in length and 30 – 40 km in width, with a density of approximately 10 E-W faults in 30 km, and local extension of about 10 %. In conjunction with pre-existing NW-SE and NE-SW faults, this E-W fault system would have intensely fractured the crust beneath the Sierra de Chichinautzin. This high degree of fracturing would have enabled the relatively fast emplacement of large quantities of volcanic material to give rise to the Chichinautzin Range, closing the Mexico Basin to the south. The gravity model shows how the different styles of structures north and south of the Chichinautzin Range (extensional and compressive) accommodate themselves. In particular, faults of the Taxco-San Miguel de Allende system affect the basement of the Morelos Basin well further south.Sociedad Geológica Mexicana, A.C.2015info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf1405-3322https://www.redalyc.org/articulo.oa?id=94340680013Boletín de la Sociedad Geológica Mexicana (México) Num.2 Vol.67reponame: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:943406800132025-09-03T18:08:48Z
dc.title.none.fl_str_mv The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
title The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
spellingShingle The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
José Oscar Campos-Enríquez
Ciencias de la Tierra
seismicity
Mexico Basin
Chichinautzin Range
Aztlán Fault System
shallow crustal model
title_short The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
title_full The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
title_fullStr The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
title_full_unstemmed The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
title_sort The Aztlán Fault System: control on the emplacement of the Chichinautzin Range volcanism, southern Mexico Basin, Mexico. Seismic and gravity characterization
dc.creator.none.fl_str_mv José Oscar Campos-Enríquez
Javier Francisco Lermo-Samaniego
Yanet Teresa Antayhua-Vera
Marcos Chavacán
Victor-Manuel Ramón-Márquez
author José Oscar Campos-Enríquez
author_facet José Oscar Campos-Enríquez
Javier Francisco Lermo-Samaniego
Yanet Teresa Antayhua-Vera
Marcos Chavacán
Victor-Manuel Ramón-Márquez
author_role author
author2 Javier Francisco Lermo-Samaniego
Yanet Teresa Antayhua-Vera
Marcos Chavacán
Victor-Manuel Ramón-Márquez
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
seismicity
Mexico Basin
Chichinautzin Range
Aztlán Fault System
shallow crustal model
topic Ciencias de la Tierra
seismicity
Mexico Basin
Chichinautzin Range
Aztlán Fault System
shallow crustal model
description Gravity and seismic studies enabled us to establish the major features of the shallow crustal structure beneath Chichinautzin Range. Accordingly, the Chichinautzin Range evolved above Mesozoic calcareous rocks lying on a metamorphic basement. To the north and south this basement is downfaulted. Nevertheless the north dipping faults downward displace the basement to larger depths (2 to 3 km) in the Mexico and Toluca basins. In the Morelos Basin, the basin is shallower. As block-faulting evolved, the basement edge migrated southwards, thus widening an E-W oriented major depression south of the Mexico Basin. In particular, gravity modeling enabled us to integrate the different faults mapped up to today in and around the Chichinautzin Range into a fault system that can be correlated from the Nevado de Toluca. This system will be referred to collectively as the Aztlán Fault System. The Xicomulco, Aztec (central and major fault) and La Pera faults are featured by seismicity. Orientation and dips obtained from simple and composite mechanisms indicate NW-SE to N-S extension with minor E-W left-lateral movement. In particular, seismicity extends down to the brittle-ductile transition crustal zone (maximum hypocentral depths of about 15 km) but consequently the major faults, considering their length, should reach lower crustal levels (approximately 40 km). This system is a major active fault system of at least 100 km in length and 30 – 40 km in width, with a density of approximately 10 E-W faults in 30 km, and local extension of about 10 %. In conjunction with pre-existing NW-SE and NE-SW faults, this E-W fault system would have intensely fractured the crust beneath the Sierra de Chichinautzin. This high degree of fracturing would have enabled the relatively fast emplacement of large quantities of volcanic material to give rise to the Chichinautzin Range, closing the Mexico Basin to the south. The gravity model shows how the different styles of structures north and south of the Chichinautzin Range (extensional and compressive) accommodate themselves. In particular, faults of the Taxco-San Miguel de Allende system affect the basement of the Morelos Basin well further south.
publishDate 2015
dc.date.none.fl_str_mv 2015
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=94340680013
identifier_str_mv 1405-3322
url https://www.redalyc.org/articulo.oa?id=94340680013
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.2 Vol.67
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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