Miocene drainage reversal of the Amazon River driven by plate–mantle interaction
Northern South America experienced significant changes in drainage patterns during the opening of the South Atlantic Ocean. Disappearance of a mega-wetland in the western Amazonian basins was followed by the formation of the eastward-draining Amazon River, which has been attributed to Andean uplift....
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ftcaltechauth:oai:authors.library.caltech.edu:q8zth-v9895 2024-06-23T07:56:47+00:00 Miocene drainage reversal of the Amazon River driven by plate–mantle interaction Shephard, G. E. Müller, R. D. Liu, L. Gurnis, M. 2010-12 https://doi.org/10.1038/NGEO1017 unknown Nature Publishing Group https://doi.org/10.1038/NGEO1017 oai:authors.library.caltech.edu:q8zth-v9895 eprintid:21468 resolverid:CaltechAUTHORS:20101221-085529930 info:eu-repo/semantics/openAccess Other Nature Geoscience, 3(12), 870-875, (2010-12) Structural geology tectonics and geodynamics info:eu-repo/semantics/article 2010 ftcaltechauth https://doi.org/10.1038/NGEO1017 2024-06-12T02:09:34Z Northern South America experienced significant changes in drainage patterns during the opening of the South Atlantic Ocean. Disappearance of a mega-wetland in the western Amazonian basins was followed by the formation of the eastward-draining Amazon River, which has been attributed to Andean uplift. However, South America's westward motion over cold, dense subducted slabs implies that regional subsidence and uplift east of the Andes may have been driven by mantle convection. Here we use a coupled model of mantle convection and plate kinematics to show that dynamic subsidence of up to 40 m Myr^(−1) initially formed the Amazonian mega-wetland. In our model, the sustained westward motion of continental South America over subducted slabs resulted in rebound of the Amazonian mega-wetland region at rates of up to 40 m Myr^(−1) after 30 million years ago, paired with continued subsidence of the eastern Amazonian sedimentary basins at 10–20 m Myr^(−1). The resulting progressive tilt of northern South America to the east enabled the establishment of the Amazon River, suggesting that mantle convection can profoundly affect the evolution of continental drainage systems. © 2010 Macmillan Publishers Limited. Received 01 April 2010; Accepted 22 October 2010; Published online 21 November 2010. Supported by StatOil, NSF Grant EAR-0810303 at Caltech and ARC Grant FL0992245 at Sydney. Author contributions: G.E.S. post-processed model output and developed palaeo-geography analysis and prepared the manuscript; R.D.M. supervised the project and contributed to the manuscript; L.L. prepared and executed numerical models and contributed to the manuscript; R.D.M. and M.G. conceived project ideas and gave technical and conceptual advice. Supplemental Material - ngeo1017-s1.pdf Article in Journal/Newspaper South Atlantic Ocean Caltech Authors (California Institute of Technology) Nature Geoscience 3 12 870 875 |
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Caltech Authors (California Institute of Technology) |
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topic |
Structural geology tectonics and geodynamics |
spellingShingle |
Structural geology tectonics and geodynamics Shephard, G. E. Müller, R. D. Liu, L. Gurnis, M. Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
topic_facet |
Structural geology tectonics and geodynamics |
description |
Northern South America experienced significant changes in drainage patterns during the opening of the South Atlantic Ocean. Disappearance of a mega-wetland in the western Amazonian basins was followed by the formation of the eastward-draining Amazon River, which has been attributed to Andean uplift. However, South America's westward motion over cold, dense subducted slabs implies that regional subsidence and uplift east of the Andes may have been driven by mantle convection. Here we use a coupled model of mantle convection and plate kinematics to show that dynamic subsidence of up to 40 m Myr^(−1) initially formed the Amazonian mega-wetland. In our model, the sustained westward motion of continental South America over subducted slabs resulted in rebound of the Amazonian mega-wetland region at rates of up to 40 m Myr^(−1) after 30 million years ago, paired with continued subsidence of the eastern Amazonian sedimentary basins at 10–20 m Myr^(−1). The resulting progressive tilt of northern South America to the east enabled the establishment of the Amazon River, suggesting that mantle convection can profoundly affect the evolution of continental drainage systems. © 2010 Macmillan Publishers Limited. Received 01 April 2010; Accepted 22 October 2010; Published online 21 November 2010. Supported by StatOil, NSF Grant EAR-0810303 at Caltech and ARC Grant FL0992245 at Sydney. Author contributions: G.E.S. post-processed model output and developed palaeo-geography analysis and prepared the manuscript; R.D.M. supervised the project and contributed to the manuscript; L.L. prepared and executed numerical models and contributed to the manuscript; R.D.M. and M.G. conceived project ideas and gave technical and conceptual advice. Supplemental Material - ngeo1017-s1.pdf |
format |
Article in Journal/Newspaper |
author |
Shephard, G. E. Müller, R. D. Liu, L. Gurnis, M. |
author_facet |
Shephard, G. E. Müller, R. D. Liu, L. Gurnis, M. |
author_sort |
Shephard, G. E. |
title |
Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
title_short |
Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
title_full |
Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
title_fullStr |
Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
title_full_unstemmed |
Miocene drainage reversal of the Amazon River driven by plate–mantle interaction |
title_sort |
miocene drainage reversal of the amazon river driven by plate–mantle interaction |
publisher |
Nature Publishing Group |
publishDate |
2010 |
url |
https://doi.org/10.1038/NGEO1017 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Nature Geoscience, 3(12), 870-875, (2010-12) |
op_relation |
https://doi.org/10.1038/NGEO1017 oai:authors.library.caltech.edu:q8zth-v9895 eprintid:21468 resolverid:CaltechAUTHORS:20101221-085529930 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1038/NGEO1017 |
container_title |
Nature Geoscience |
container_volume |
3 |
container_issue |
12 |
container_start_page |
870 |
op_container_end_page |
875 |
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1802650129944018944 |