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Jurassic to Tertiary tectonic, volcanic, and sedimentary evolution of the Southern Andean intra-arc zone, Chile (38-39°S): a survey

Authors
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Kemnitz,  Helga
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kramer,  W.
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Rosenau,  Matthias
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Kemnitz, H., Kramer, W., Rosenau, M. (2005): Jurassic to Tertiary tectonic, volcanic, and sedimentary evolution of the Southern Andean intra-arc zone, Chile (38-39°S): a survey. - Neues Jahrbuch für Geologie und Paläontologie Abhandlungen, 236, 1/2, 19-42.
https://doi.org/10.1127/njgpa/236/2005/19


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_233113
Abstract
In the Southern Andean arc, from Jurassic to Pliocene times, repeated periods of compressional and extensional tectonics coupled with subduction-related volcanism give the oppor­tunity to study the relationship between tectonism, magmatism, and sedimentation across a com­posite section between 38° and 39°S. Marine Jurassic formations are associated with calc-alkaline and subordinately alkaline volcanic rocks. The Miocene lacustrine sedimentation was accompanied and mainly ruled by calc-alkaline volcanic activity, which is documented by changes of the detrital composition. The more differentiated volcanism (tholeiitic, calc-alkaline, alkaline) during the Pliocene is related to transtensional tectonics. The stable calc-alkaline component of the Jurassic to Pliocene volcanism confirms a long-term stationary arc segment. This history further suggests that a con­tinuous evolution was modified by multiple source magmatic episodes associated with widening and narrowing in the arc.