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Bibliographic Details
Main Author:	Carlos J. Chernicoff
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional Autónoma de México 2019
Subjects:	Ciencias de la Tierra edad U Pérmico Triásico Pb SHRIMP Argentina
Online Access:	https://www.redalyc.org/articulo.oa?id=57265242002 https://www.redalyc.org/journal/572/57265242002/ https://www.redalyc.org/journal/572/57265242002/html/ https://www.redalyc.org/journal/572/57265242002/57265242002.epub https://www.redalyc.org/journal/572/57265242002/movil https://doi.org/10.22201/cgeo.20072902e.2019.1.930
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El Corredor Magmático Intracratónico Pérmico-Triásico de la provincia de La Pampa, Argentina: nuevas edades U-Pb SHRIMP, composición isotópica de Hf e implicancias geodinámicas Carlos J. Chernicoff Eduardo O. Zappettini João O. Santos Neal McNaughton Ciencias de la Tierra edad U Pérmico Triásico Pb SHRIMP Argentina Se ha realizado un estudio y revisión de las unidades magmáticas que integran el Corredor Magmático Intracratónico PérmicoTriásico de La Pampa (CMPT-LP), centro-sur de Argentina. Se dan a conocer nuevas edades U-Pb SHRIMP, composición isotópica de Hf y composición química de algunas unidades integrantes del CMPT-LP: 1) Sienogranito Chacharramendi, edad 254.7 ± 1.3 Ma (Pérmico tardío, Lopingiano), edad modelo Hf de 1640 Ma con εHf promedio de -5.68; 2) Riolita Lihue Calel, 239.3 ± 1.5 Ma (Triásico Medio), edad modelo Hf de 1640 Ma con εHf promedio de -5.56. Esto indica que las dos unidades datadas fueron cristalizadas a partir de un fundido mantélico que incorporó corteza de edad statheriana tardía hasta calymmiana, tomando en cuenta también la edad modelo Nd de 1483 Ma del sector más distal (sudoriental) (Granito López Lecube) del CMPTLP obtenida por otros autores.Nuevos datos geoquímicos aquí aportados, analizados junto con datos geoquímicos previos, denotan la impronta o huella anorogénica –ambiente de intraplaca– del corredor magmático CMPT-LP, destacándose su consistencia con los granitos del tipo A. debido a la similitud de sus fuentes con aquéllas de las que derivan los basaltos de islas oceánicas (OIB), como queda evidenciado, p. ej., en los cocientes Y/Nb <1.2. La pertenencia de las rocas del CMPT-LP mayoritariamente al tipo de alto potasio también es consistente con su ocurrencia en un ambiente tectónico de intraplaca. El ambiente anorogénico del CMPT-LP contrasta con aquél de la etapa tardía del Grupo Choiyoi propiamente dicho, que si bien también está asociada a extensión pérmica tardía – triásica temprana, ocurre en el contexto orogénico propio del Arco Magmático Choiyoi. Por tal razón se analiza la conveniencia de excluir el CMPT-LP del Grupo Choiyoi, en el que hasta ahora estaba incluido. Asimismo se comparan brevemente los marcos tectónicos de las fajas orogénicas lindantes del CMPT-LP: fajas de San Rafael (o Sanrafaélica, o Arco-Retroarco Choiyoi) y Gondwánides Norpatagónicos. 2019 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57265242002 https://www.redalyc.org/journal/572/57265242002/ https://www.redalyc.org/journal/572/57265242002/html/ https://www.redalyc.org/journal/572/57265242002/57265242002.epub https://www.redalyc.org/journal/572/57265242002/movil https://doi.org/10.22201/cgeo.20072902e.2019.1.930 es http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.36

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