TY - JOUR
T1 - Upper Plate Controls on the Formation of Broken Foreland Basins in the Andean Retroarc Between 26°S and 28°S
T2 - From Cretaceous Rifting to Paleogene and Miocene Broken Foreland Basins
AU - Zapata, S.
AU - Sobel, E. R.
AU - Del Papa, C.
AU - Glodny, J.
N1 - Funding Information:
We acknowledge the Deutsche Forschungsgemeinschaft (DFG, Grant STR373/34‐1) and the Brandenburg Ministry of Sciences, Research and Cultural Affairs, Germany, for funding this study as part of the International Research Training Group IGK2018(StRATEGy). We also acknowledge the German‐Argentine University Network (DAHZ/CUAA), the Argentinean science foundation (CONICET), and CICTERRA for their funding and support. We would especially like to thank M. Strecker for helpful discussions, G. Aranda and P. Payrola for assistance with samples, and A. Bergner, H. Wichura, V. Torres, and A. Gutierrez for their administrative support. The reviewers Brian K. Horton and David M. Pearson are acknowledged for their constructive comments.
Funding Information:
We acknowledge the Deutsche Forschungsgemeinschaft (DFG, Grant STR373/34-1) and the Brandenburg Ministry of Sciences, Research and Cultural Affairs, Germany, for funding this study as part of the International Research Training Group IGK2018(StRATEGy). We also acknowledge the German-Argentine University Network (DAHZ/CUAA), the Argentinean science foundation (CONICET), and CICTERRA for their funding and support. We would especially like to thank M. Strecker for helpful discussions, G. Aranda and P. Payrola for assistance with samples, and A. Bergner, H. Wichura, V. Torres, and A. Gutierrez for their administrative support. The reviewers Brian K. Horton and David M. Pearson are acknowledged for their constructive comments.
Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Marked along-strike changes in stratigraphy, mountain belt morphology, basement exhumation, and deformation styles characterize the Andean retroarc; these changes have previously been related to spatiotemporal variations in the subduction angle. We modeled new apatite fission track and apatite (U-Th-Sm)/He data from nine ranges located between 26°S and 28°S. Using new and previously published data, we constructed a Cretaceous to Pliocene paleogeographic model that delineates a four-stage tectonic evolution: extensional tectonics during the Cretaceous (120–75 Ma), the formation of a broken foreland basin between 55 and 30 Ma, reheating due to burial beneath sedimentary rocks (18–13 Ma), and deformation, exhumation, and surface uplift during the Late Miocene and the Pliocene (13–3 Ma). Our model highlights how preexisting upper plate structures control the deformation patterns of broken foreland basins. Because retroarc deformation predates flat-slab subduction, we propose that slab anchoring may have been the precursor of Eocene–Oligocene compression in the Andean retroarc. Our model challenges models which consider broken foreland basins and retroarc deformation in the NW Argentinian Andes to be directly related to Miocene flat subduction.
AB - Marked along-strike changes in stratigraphy, mountain belt morphology, basement exhumation, and deformation styles characterize the Andean retroarc; these changes have previously been related to spatiotemporal variations in the subduction angle. We modeled new apatite fission track and apatite (U-Th-Sm)/He data from nine ranges located between 26°S and 28°S. Using new and previously published data, we constructed a Cretaceous to Pliocene paleogeographic model that delineates a four-stage tectonic evolution: extensional tectonics during the Cretaceous (120–75 Ma), the formation of a broken foreland basin between 55 and 30 Ma, reheating due to burial beneath sedimentary rocks (18–13 Ma), and deformation, exhumation, and surface uplift during the Late Miocene and the Pliocene (13–3 Ma). Our model highlights how preexisting upper plate structures control the deformation patterns of broken foreland basins. Because retroarc deformation predates flat-slab subduction, we propose that slab anchoring may have been the precursor of Eocene–Oligocene compression in the Andean retroarc. Our model challenges models which consider broken foreland basins and retroarc deformation in the NW Argentinian Andes to be directly related to Miocene flat subduction.
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U2 - 10.1029/2019GC008876
DO - 10.1029/2019GC008876
M3 - Research Article
AN - SCOPUS:85087778540
SN - 1525-2027
VL - 21
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
IS - 7
M1 - e2019GC008876
ER -