TY - JOUR
T1 - Sedimentary record of regional deformation and dynamics of the thick-skinned southern Puna Plateau, central Andes (26-27°S)
AU - Zhou, Renjie
AU - Schoenbohm, Lindsay M.
AU - Sobel, Edward R.
AU - Carrapa, Barbara
AU - Davis, Donald W.
N1 - Funding Information:
This work is supported by an NSERC Discovery Grant to L.M. Schoenbohm. R. Zhou acknowledges support from DAAD ( Deutscher Akademischer Austauschdienst ), Geological Society of America Foundation and American Association of Petroleum Geologists Foundation . We thank the Materials Research Department at the GSI Helmholtz-Zentrum (Darmstadt, Germany) for heavy ion irradiation. Thorough, critical and constructive reviews by Jonas Kley and Andrew Leier have significantly improved this manuscript. We also thank Editor An Yin for editorial handling and constructive comments.
Publisher Copyright:
© 2015 Elsevier B.V..
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The Puna Plateau, adjacent Eastern Cordillera and the Sierras Pampeanas of the central Andes are largely characterized by thick-skinned, basement-involved deformation. The Puna Plateau hosts ~N-S trending bedrock ranges bounded by deep-seated reverse faults and sedimentary basins. We contribute to the understanding of thick-skinned dynamics in the Puna Plateau by constraining regional kinematics of the poorly understood southern Puna Plateau through a multidisciplinary approach. On the southeastern plateau, sandstone modal composition and detrital zircon U-Pb and apatite fission-track data from Cenozoic strata indicate basin accumulation during the late Eocene to early Oligocene (~38-28 Ma). Provenance analysis reveals the existence of a regional-scale basin covering the southern Puna Plateau during late Eocene to early Oligocene time (~38-28 Ma) that was sourced from both the western plateau and the eastern plateau margin and had a depocenter located to the west. Petrographic and detrital zircon U-Pb data reveal erosion of proximal western and eastern sources after ~12 Ma, in mid-late Miocene time. This indicates that the regional basin was compartmentalized into small-scale depocenters by the growth of basement-cored ranges continuing into the late Miocene (~12-8 Ma). We suggest that the Cenozoic history of the southern Puna Plateau records the formation of a regional basin that was possibly driven by lithospheric flexure during the late Eocene to early Oligocene, before the growth of distributed basement-cored ranges starting as early as the late Oligocene.
AB - The Puna Plateau, adjacent Eastern Cordillera and the Sierras Pampeanas of the central Andes are largely characterized by thick-skinned, basement-involved deformation. The Puna Plateau hosts ~N-S trending bedrock ranges bounded by deep-seated reverse faults and sedimentary basins. We contribute to the understanding of thick-skinned dynamics in the Puna Plateau by constraining regional kinematics of the poorly understood southern Puna Plateau through a multidisciplinary approach. On the southeastern plateau, sandstone modal composition and detrital zircon U-Pb and apatite fission-track data from Cenozoic strata indicate basin accumulation during the late Eocene to early Oligocene (~38-28 Ma). Provenance analysis reveals the existence of a regional-scale basin covering the southern Puna Plateau during late Eocene to early Oligocene time (~38-28 Ma) that was sourced from both the western plateau and the eastern plateau margin and had a depocenter located to the west. Petrographic and detrital zircon U-Pb data reveal erosion of proximal western and eastern sources after ~12 Ma, in mid-late Miocene time. This indicates that the regional basin was compartmentalized into small-scale depocenters by the growth of basement-cored ranges continuing into the late Miocene (~12-8 Ma). We suggest that the Cenozoic history of the southern Puna Plateau records the formation of a regional basin that was possibly driven by lithospheric flexure during the late Eocene to early Oligocene, before the growth of distributed basement-cored ranges starting as early as the late Oligocene.
KW - Apatite fission-track thermochronology
KW - Basin analysis
KW - Puna Plateau
KW - Regional deformation
KW - Thick-skinned deformation
KW - Zircon U-Pb geochronology
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U2 - 10.1016/j.epsl.2015.11.012
DO - 10.1016/j.epsl.2015.11.012
M3 - Article
AN - SCOPUS:84954386894
SN - 0012-821X
VL - 433
SP - 317
EP - 325
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
ER -