首页|Unmixing detrital zircon U-Pb ages reveals tectonic and climatic depositional influences on the Carboniferous Ansilta Formation,Calingasta-Uspallata Basin,Western Argentina

Unmixing detrital zircon U-Pb ages reveals tectonic and climatic depositional influences on the Carboniferous Ansilta Formation,Calingasta-Uspallata Basin,Western Argentina

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The Late Paleozoic Ice Age(LPIA)was a principal control of sedimentation across Gondwana from the late Devonian through early Permian.We assess the hypothesis that glacial to interglacial transitions in west-ern Argentina were the primary control influencing sediment routing patterns among the various Carboniferous-Permian basins in western Argentina.The Carboniferous Ansilta Formation consists of gla-ciomarine,nearshore,and fluvial systems deposited during the LPIA along the eastern margin of the Calingasta-Uspallata Basin in Argentina.The lower,glacially influenced succession of the Ansilta Formation records at least five glacial advances;the upper succession of consists of progradational shal-low marine,deltaic,and fluvial strata.We combine 1225 new U-Pb zircon ages from six samples of the Carboniferous Ansilta Formation in the Calingasta-Uspallata Basin with 5864 U-Pb ages from 147 pub-lished samples in the detritalPy-mix forward mixture model to characterize provenance shifts.For the gla-cially influenced lower Ansilta Formation,sediment was derived locally from the Protoprecordillera,which was a prominent highland with alpine glaciers flowing west and east into the Calingasta-Uspallata and Paganzo basins,respectively.Thus,there was little or no connection between these two basins during Serpukhovian-Bashkirian glaciation.The fluvial/deltaic upper Ansilta had distal sediment sources in the Sierras Pampeanas.Furthermore,our results support the collapse of the Protoprecordillera topographic barrier,enabling drainage patterns connecting the Paganzo and Calingasta-Uspallata basins by late Pennsylvanian-early Permian time.

Late Paleozoic Ice AgeArgentinaCalingasta-Uspallata BasinAnsilta FormationDetrital zircon provenance

J.R.Malone、J.E.Malone、J.L.Isbell、D.H.Malone、J.P.Craddock、K.N.Pauls

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Department of Geological Sciences,Jackson School of Geosciences,University of Texas at Austin,Austin,TX 78712,USA

Iowa Geological Survey,University of Iowa,Iowa City,IA 52240,USA

Department of Geosciences,University of Wisconsin-Milwaukee,Milwaukee,WI 53211,USA

Department of Geography,Geology and the Environment,Illinois State University,Normal,IL 61790-4400,USA

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USA's National Science FoundationUSA's National Science FoundationUSA's National Science FoundationALC

144355715592311729219NSF-EAR 1649254

2024

10.1016/j.gsf.2024.101807

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(4)
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