High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina
The duration and geographic extent of Carboniferous glacial events in southern Gondwana remain poorly constrained despite recent evidence for a more dynamic glacial history than previously considered. We report 10 high-precision (2σ ± <0.1%) U-Pb ages for the Permian-Carboniferous Paganzo Group,...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v122_n9-10_p1480_Gulbranson http://hdl.handle.net/20.500.12110/paper_00167606_v122_n9-10_p1480_Gulbranson |
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paper:paper_00167606_v122_n9-10_p1480_Gulbranson2023-06-08T14:38:51Z High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina Argentina Chronostratigraphy Climate history Climate shifts Depositional environment Dryland Fluvial deposits Glacial history High-precision Late Paleozoic Permian Radiometric calibrations Regime shift Regional climate Sub-humid U-Pb ages Western region Calibration Clay deposits Deposits Feldspar deposits Lead Glacial geology age determination aridity calibration Carboniferous geochronology glaciation paleoclimate precision uranium-lead dating Argentina Blanco Basin Paganzo Basin The duration and geographic extent of Carboniferous glacial events in southern Gondwana remain poorly constrained despite recent evidence for a more dynamic glacial history than previously considered. We report 10 high-precision (2σ ± <0.1%) U-Pb ages for the Permian-Carboniferous Paganzo Group, NW Argentina, that redefine the chronostratigraphy of the late Paleozoic Paganzo and Río Blanco Basins, and significantly refine the timing of glacial events and climate shifts in the western region of southern Gondwana. Radiometric calibration of the Paganzo Group indicates three pulses of Carboniferous glaciation in the mid-Visean, the late Serpukhovian to earliest Bashkirian, and between the latest Bashkirian to early Moscovian. An abrupt shift in depositional style from high-sinuosity single-storied fluvial deposits and clay-rich paleosols to low-sinuosity multistoried feldspathic fluvial deposits intercalated with eolianites and calcic paleosols is constrained to the latest Moscovian and earliest Kasimovian. These constraints indicate a relatively abrupt climate shift from humid-subhumid to nonseasonal semiarid regional climate conditions that occurred significantly earlier than previously inferred (Early Permian). This period of high-latitude aridity was contemporaneous with a shift to dryland depositional environments and a major vegetation regime shift documented throughout the Pangean paleotropics in the Pennsylvanian. © 2010 Geological Society of America. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v122_n9-10_p1480_Gulbranson http://hdl.handle.net/20.500.12110/paper_00167606_v122_n9-10_p1480_Gulbranson |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Chronostratigraphy Climate history Climate shifts Depositional environment Dryland Fluvial deposits Glacial history High-precision Late Paleozoic Permian Radiometric calibrations Regime shift Regional climate Sub-humid U-Pb ages Western region Calibration Clay deposits Deposits Feldspar deposits Lead Glacial geology age determination aridity calibration Carboniferous geochronology glaciation paleoclimate precision uranium-lead dating Argentina Blanco Basin Paganzo Basin |
| spellingShingle |
Argentina Chronostratigraphy Climate history Climate shifts Depositional environment Dryland Fluvial deposits Glacial history High-precision Late Paleozoic Permian Radiometric calibrations Regime shift Regional climate Sub-humid U-Pb ages Western region Calibration Clay deposits Deposits Feldspar deposits Lead Glacial geology age determination aridity calibration Carboniferous geochronology glaciation paleoclimate precision uranium-lead dating Argentina Blanco Basin Paganzo Basin High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| topic_facet |
Argentina Chronostratigraphy Climate history Climate shifts Depositional environment Dryland Fluvial deposits Glacial history High-precision Late Paleozoic Permian Radiometric calibrations Regime shift Regional climate Sub-humid U-Pb ages Western region Calibration Clay deposits Deposits Feldspar deposits Lead Glacial geology age determination aridity calibration Carboniferous geochronology glaciation paleoclimate precision uranium-lead dating Argentina Blanco Basin Paganzo Basin |
| description |
The duration and geographic extent of Carboniferous glacial events in southern Gondwana remain poorly constrained despite recent evidence for a more dynamic glacial history than previously considered. We report 10 high-precision (2σ ± <0.1%) U-Pb ages for the Permian-Carboniferous Paganzo Group, NW Argentina, that redefine the chronostratigraphy of the late Paleozoic Paganzo and Río Blanco Basins, and significantly refine the timing of glacial events and climate shifts in the western region of southern Gondwana. Radiometric calibration of the Paganzo Group indicates three pulses of Carboniferous glaciation in the mid-Visean, the late Serpukhovian to earliest Bashkirian, and between the latest Bashkirian to early Moscovian. An abrupt shift in depositional style from high-sinuosity single-storied fluvial deposits and clay-rich paleosols to low-sinuosity multistoried feldspathic fluvial deposits intercalated with eolianites and calcic paleosols is constrained to the latest Moscovian and earliest Kasimovian. These constraints indicate a relatively abrupt climate shift from humid-subhumid to nonseasonal semiarid regional climate conditions that occurred significantly earlier than previously inferred (Early Permian). This period of high-latitude aridity was contemporaneous with a shift to dryland depositional environments and a major vegetation regime shift documented throughout the Pangean paleotropics in the Pennsylvanian. © 2010 Geological Society of America. |
| title |
High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| title_short |
High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| title_full |
High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| title_fullStr |
High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| title_full_unstemmed |
High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina |
| title_sort |
high-precision u-pb calibration of carboniferous glaciation and climate history, paganzo group, nw argentina |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v122_n9-10_p1480_Gulbranson http://hdl.handle.net/20.500.12110/paper_00167606_v122_n9-10_p1480_Gulbranson |
| _version_ |
1768545536440270848 |