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Petrography and tectonic provenance of the Permian Tunas Formation:Implications on the paleotectonic setting during the ClaromecóForeland Basin evolution,southwestern Gondwana margin,Argentina

引用

Journal of Palaeogeography 2022年第3期11卷 427-447页

作者： María Belén Febbo renata n.tomezzoli nora n.Cesaretti Giselle Choque natalia B.Fortunatti Guadalupe Arzadún Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Argentina Dpto.de Geología Universidad Nacional del SurAvenida Alem 1253B8000ICPBahía BlancaArgentina Centro de Geología Aplicada y Medio Ambiente(CGAMA CIC–UNS)Dpto.de GeologíaUniversidad Nacional del SurBahía BlancaArgentina Laboratorio de Paleomagnetismo“Daniel A.Valencio” Instituto de Geociencias BásicasAplicadas y Ambientales de Buenos Aires(IGEBA)Departamento de Ciencias GeológicasFacultad de Ciencias Exactas y Naturales(FCEyN)Universidad de Buenos Aires(UBA)Pabellón II(1428)CABAArgentina Laboratorio de Termocronología(La.Te Andes–COnICET) Las Moreras 310A4401XBAVaquerosSaltaArgentina

The Claromec o Basin is located at the south-western sector of the Buenos Aires province,*** basin is considered a foreland basin closely related to the evolution of the southwestern Gondwana *** contribution focuses on the provenance analysis of the Tunas Formation(Permian,Pillahuinc o Group),which represents the last filling stage for the Claromec o Foreland *** and tectonic provenance analyses were performed in sandstones recovered from subsurface(PAnG 0001 and PAnG0003 exploration wells)and outcrops located close to the basin center(Gonzales Chaves locality).In the subsurface,the analyzed succession is composed of medium-to fine-grained sandstones interbedded with tuffs,mudrocks,carbonaceous mudrocks and coal *** outcrops,the succession is dominated by mediumto fine-grained sandstones interbedded with *** composition patterns are distributed into the recycled orogen and transitionally recycled to mixed *** analyses,in addition to provenance and sedimentological studies,confirm that sedimentary material was derived from a mixed source,which largely comes from the Sierras Australes fold and thrust belt,located towards the W-SW,where the sedimentary succession is interbedded with volcanic *** Tunas Formation shows clear differences in its modal composition,paleocurrent direction and paleoenvironmental conditions with respect to the underlying units of the Pillahuinc o Group(Sauce Grande,Piedra Azul and Bonete formations).Source areas changed from cratonic to mixed fold belt/arc-derived material,suggesting variations in the Claromec o Basin configuration during the Late *** in the paleotectonic scenario during the deposition of the Tunas Formation have been interpreted as a consequence of a compressive post-collisional deformation event,the product of adjustment,accommodation and translation of terrains towards the equator during the Permian-Triassic to form Pangea.

关键词： Provenance area Petrography Tunas Formation ClaromecóForeland Basin Southwestern Gondwana margin Permian Upper Paleozoic

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