Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane
An outstanding feature of the Mexican Cordilleran magmatic arc between Sonora and Chiapas is the presence of numerous plutonic and batholitic bodies of Cretaceous to Miocene ages. In this contribution, we investigated the petrogenesis and age of the gabbros from Jilotlán, Jalisco, in order to bette...
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Universidad Nacional Autónoma de México
2018-01-01
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| Series: | Revista Mexicana de Ciencias Geológicas |
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| Online Access: | https://rmcg.unam.mx/index.php/rmcg/article/view/646 |
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| author | Daniel Villanueva-Lascurain Gabriela Solís-Pichardo Peter Schaaf Teodoro Hernández-Treviño Josué Salazar-Juárez Pedro Corona-Chávez |
| author_facet | Daniel Villanueva-Lascurain Gabriela Solís-Pichardo Peter Schaaf Teodoro Hernández-Treviño Josué Salazar-Juárez Pedro Corona-Chávez |
| author_sort | Daniel Villanueva-Lascurain |
| collection | DOAJ |
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An outstanding feature of the Mexican Cordilleran magmatic arc between Sonora and Chiapas is the presence of numerous plutonic and batholitic bodies of Cretaceous to Miocene ages. In this contribution, we investigated the petrogenesis and age of the gabbros from Jilotlán, Jalisco, in order to better understand their genetic relation with the intruding and surrounding Late Cretaceous calc-alkaline mantle-type granitoids. Gabbros from Manzanillo (Colima), Tepalcaltepec, and Aquila (Michoacán) were also studied. The objective of this work is to contribute new findings to the tectonic setting and magma generation processes of the Cretaceous magmatic arc in the coastal Zihuatanejo terrane, which is part of the Guerrero terrane.
All gabbros are hornblende rich, which indicates hydrated con- ditions. Clinopyroxene crystals and hornblende pseudomorphs have plagioclase inclusions, suggesting exsolution by a rapid uplift. Geochemically, most gabbros are calc-alkaline. The relatively flat trace element patterns display incompatible element (LILE and LREE) en- richment relative to the less incompatible elements (HFSE and HREE), which show minor enrichment or are even depleted with respect to N-MORB. Positive Pb and Sr anomalies as well as LILE enrichment in comparison to HFSE and REE suggest a magmatic arc origin.
The Sr and Nd isotopic compositions indicate that the Jilotlán, Tepalcaltepec, and Manzanillo gabbros have a common source, comparable to N-MORB. Depleted mantle model ages (TDM) are similar for the gabbros and a quartz monzodiorite (averaging ~500 Ma) reflecting participation of a crustal component in their genesis. Isotopic data indicate that the gabbros could have been generated from a combination of mantle and crustal components. The existence of a Cretaceous, Barremian to Albian (~130–100 Ma), extensional arc proposed by other studies suggests that the gabbros were generated in a thinned crust setting.
Hornblende 40Ar/39Ar ages and U-Pb zircon ages of Jilotlán gabbros are undistinguishable at ~114 Ma, which indicates that they crystallized ~40 Ma earlier than the surrounding granitoids dated at ~70 Ma. The identical ages for both isotopic systems in the gabbros give evidence for their shallow emplacement and/or rapid uplift. The ~118 Ma (K-Ar hornblende) age of an andesite from the Tecalitlán Formation host rock suggests that the gabbros may represent the plutonic counterpart of this volcanosedimentary sequence.
The crystalline rocks of the study area are magmatically very primitive (initial epsilon Nd (εNdi) up to ~+7, TDM max. ~0.7 Ga), without evidence of evolved crustal components in comparison to the Puerto Vallarta batholith, located NW of the study area, which contains Precambrian crustal components (εNdi as low as ~-7, TDM up to ~1.55 Ga). This evidences different tectonic settings for these two areas. This study supports the hypothesis that a long-lived subduction zone (at least since the Early Cretaceous) generated poorly evolved arc rocks in a continental arc setting in the Guerrero terrane.
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| format | Article |
| id | doaj-art-de0294ee448d4f908cbae433a57114b2 |
| institution | DOAJ |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Universidad Nacional Autónoma de México |
| record_format | Article |
| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-de0294ee448d4f908cbae433a57114b22025-08-20T03:20:30ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022018-01-0133110.22201/cgeo.20072902e.2016.1.646Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terraneDaniel Villanueva-Lascurain0Gabriela Solís-Pichardo1Peter Schaaf2Teodoro Hernández-Treviño3Josué Salazar-Juárez4Pedro Corona-Chávez5Posgrado en Ciencias de la Tierra, Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico.Laboratorio Universitario de Geoquímica Isotópica (LUGIS), Instituto de Geología, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico.Laboratorio Universitario de Geoquímica Isotópica (LUGIS), Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico.Laboratorio Universitario de Geoquímica Isotópica (LUGIS), Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico.Posgrado en Ciencias de la Tierra, Instituto de Geología, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico.Instituto de Investigaciones en Ciencias de la Tierra, Universidad Michoacana de San Nicolás de Hidalgo, 58060 Morelia, Mich., Mexico. An outstanding feature of the Mexican Cordilleran magmatic arc between Sonora and Chiapas is the presence of numerous plutonic and batholitic bodies of Cretaceous to Miocene ages. In this contribution, we investigated the petrogenesis and age of the gabbros from Jilotlán, Jalisco, in order to better understand their genetic relation with the intruding and surrounding Late Cretaceous calc-alkaline mantle-type granitoids. Gabbros from Manzanillo (Colima), Tepalcaltepec, and Aquila (Michoacán) were also studied. The objective of this work is to contribute new findings to the tectonic setting and magma generation processes of the Cretaceous magmatic arc in the coastal Zihuatanejo terrane, which is part of the Guerrero terrane. All gabbros are hornblende rich, which indicates hydrated con- ditions. Clinopyroxene crystals and hornblende pseudomorphs have plagioclase inclusions, suggesting exsolution by a rapid uplift. Geochemically, most gabbros are calc-alkaline. The relatively flat trace element patterns display incompatible element (LILE and LREE) en- richment relative to the less incompatible elements (HFSE and HREE), which show minor enrichment or are even depleted with respect to N-MORB. Positive Pb and Sr anomalies as well as LILE enrichment in comparison to HFSE and REE suggest a magmatic arc origin. The Sr and Nd isotopic compositions indicate that the Jilotlán, Tepalcaltepec, and Manzanillo gabbros have a common source, comparable to N-MORB. Depleted mantle model ages (TDM) are similar for the gabbros and a quartz monzodiorite (averaging ~500 Ma) reflecting participation of a crustal component in their genesis. Isotopic data indicate that the gabbros could have been generated from a combination of mantle and crustal components. The existence of a Cretaceous, Barremian to Albian (~130–100 Ma), extensional arc proposed by other studies suggests that the gabbros were generated in a thinned crust setting. Hornblende 40Ar/39Ar ages and U-Pb zircon ages of Jilotlán gabbros are undistinguishable at ~114 Ma, which indicates that they crystallized ~40 Ma earlier than the surrounding granitoids dated at ~70 Ma. The identical ages for both isotopic systems in the gabbros give evidence for their shallow emplacement and/or rapid uplift. The ~118 Ma (K-Ar hornblende) age of an andesite from the Tecalitlán Formation host rock suggests that the gabbros may represent the plutonic counterpart of this volcanosedimentary sequence. The crystalline rocks of the study area are magmatically very primitive (initial epsilon Nd (εNdi) up to ~+7, TDM max. ~0.7 Ga), without evidence of evolved crustal components in comparison to the Puerto Vallarta batholith, located NW of the study area, which contains Precambrian crustal components (εNdi as low as ~-7, TDM up to ~1.55 Ga). This evidences different tectonic settings for these two areas. This study supports the hypothesis that a long-lived subduction zone (at least since the Early Cretaceous) generated poorly evolved arc rocks in a continental arc setting in the Guerrero terrane. https://rmcg.unam.mx/index.php/rmcg/article/view/646gabbropetrogenesisgeochronologyJilotlán plutonGuerrero terraneMexico. |
| spellingShingle | Daniel Villanueva-Lascurain Gabriela Solís-Pichardo Peter Schaaf Teodoro Hernández-Treviño Josué Salazar-Juárez Pedro Corona-Chávez Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane Revista Mexicana de Ciencias Geológicas gabbro petrogenesis geochronology Jilotlán pluton Guerrero terrane Mexico. |
| title | Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane |
| title_full | Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane |
| title_fullStr | Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane |
| title_full_unstemmed | Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane |
| title_short | Age and origin of the gabbros in the Jilotlán pluton, Jalisco: primitive magmatic rocks in the southern part of the Guerrero terrane |
| title_sort | age and origin of the gabbros in the jilotlan pluton jalisco primitive magmatic rocks in the southern part of the guerrero terrane |
| topic | gabbro petrogenesis geochronology Jilotlán pluton Guerrero terrane Mexico. |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/646 |
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