Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia)
The Valley of Lakes basin (Mongolia) contains a unique continental sedimentary archive, suitable for constraining the influence of tectonics and climate change on the aridification of Central Asia in the Cenozoic. We identify the sedimentary provenance, the (post)depositional environment and the pal...
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/12eb93b5-fecc-4837-8229-abfb4024e25e 2024-06-23T07:47:21+00:00 Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) Baldermann, Andre Wasser, Oliver Abdullayev, Elshan Bernasconi, Stefano Löhr, Stefan Wemmer, Klaus Piller, Werner E. Rudmin, Maxim Richoz, Sylvain 2021 application/pdf https://researchers.mq.edu.au/en/publications/12eb93b5-fecc-4837-8229-abfb4024e25e https://doi.org/10.5194/cp-17-1955-2021 https://research-management.mq.edu.au/ws/files/198999487/198647327.pdf http://www.scopus.com/inward/record.url?scp=85116386493&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Baldermann , A , Wasser , O , Abdullayev , E , Bernasconi , S , Löhr , S , Wemmer , K , Piller , W E , Rudmin , M & Richoz , S 2021 , ' Palaeo-environmental evolution of Central Asia during the Cenozoic : new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) ' , Climate of the Past , vol. 17 , no. 5 , pp. 1955-1972 . https://doi.org/10.5194/cp-17-1955-2021 article 2021 ftmacquarieunicr https://doi.org/10.5194/cp-17-1955-2021 2024-06-12T23:47:25Z The Valley of Lakes basin (Mongolia) contains a unique continental sedimentary archive, suitable for constraining the influence of tectonics and climate change on the aridification of Central Asia in the Cenozoic. We identify the sedimentary provenance, the (post)depositional environment and the palaeo-climate based on sedimentological, petrographical, mineralogical, and (isotope) geochemical signatures recorded in authigenic and detrital silicates as well as soil carbonates in a sedimentary succession spanning from ~ 34 to 21 Ma. The depositional setting was characterized by an ephemeral braided river system draining prograding alluvial fans, with episodes of lake, playa or opensteppe sedimentation. Metamorphics from the northern adjacent Neoarchean to late Proterozoic hinterlands provided a continuous influx of silicate detritus to the basin, as indicated by K-Ar ages of detrital muscovite (~ 798-728 Ma) and discrimination function analysis. The authigenic clay fraction is dominated by illite-smectite and "hairy"illite (K-Ar ages of ~ 34-25 Ma), which formed during coupled petrogenesis and precipitation from hydrothermal fluids originating from major basalt flow events (~32-29 and ~ 29-25 Ma). Changes in hydroclimate are recorded in δ18 O and δ13 C profiles of soil carbonates and in silicate mineral weathering patterns, indicating that comparatively humid to semi-arid conditions prevailed in the late(st) Eocene, changing into arid conditions in the Oligocene and back to humid to semi-arid conditions in the early Miocene. Aridification steps are indicated at ~ 34-33, ~ 31, ~ 28 and ~ 23 Ma and coincide with some episodes of high-latitude ice-sheet expansion inferred from marine deep-sea sedimentary records. This suggests that long-term variations in the ocean-atmosphere circulation patterns due to pCO2 fall, reconfiguration of ocean gateways and ice-sheet expansion in Antarctica could have impacted the hydroclimate and weathering regime in the basin. We conclude that the aridification in Central Asia was ... Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Macquarie University Research Portal Climate of the Past 17 5 1955 1972 |
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Open Polar |
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Macquarie University Research Portal |
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ftmacquarieunicr |
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English |
description |
The Valley of Lakes basin (Mongolia) contains a unique continental sedimentary archive, suitable for constraining the influence of tectonics and climate change on the aridification of Central Asia in the Cenozoic. We identify the sedimentary provenance, the (post)depositional environment and the palaeo-climate based on sedimentological, petrographical, mineralogical, and (isotope) geochemical signatures recorded in authigenic and detrital silicates as well as soil carbonates in a sedimentary succession spanning from ~ 34 to 21 Ma. The depositional setting was characterized by an ephemeral braided river system draining prograding alluvial fans, with episodes of lake, playa or opensteppe sedimentation. Metamorphics from the northern adjacent Neoarchean to late Proterozoic hinterlands provided a continuous influx of silicate detritus to the basin, as indicated by K-Ar ages of detrital muscovite (~ 798-728 Ma) and discrimination function analysis. The authigenic clay fraction is dominated by illite-smectite and "hairy"illite (K-Ar ages of ~ 34-25 Ma), which formed during coupled petrogenesis and precipitation from hydrothermal fluids originating from major basalt flow events (~32-29 and ~ 29-25 Ma). Changes in hydroclimate are recorded in δ18 O and δ13 C profiles of soil carbonates and in silicate mineral weathering patterns, indicating that comparatively humid to semi-arid conditions prevailed in the late(st) Eocene, changing into arid conditions in the Oligocene and back to humid to semi-arid conditions in the early Miocene. Aridification steps are indicated at ~ 34-33, ~ 31, ~ 28 and ~ 23 Ma and coincide with some episodes of high-latitude ice-sheet expansion inferred from marine deep-sea sedimentary records. This suggests that long-term variations in the ocean-atmosphere circulation patterns due to pCO2 fall, reconfiguration of ocean gateways and ice-sheet expansion in Antarctica could have impacted the hydroclimate and weathering regime in the basin. We conclude that the aridification in Central Asia was ... |
format |
Article in Journal/Newspaper |
author |
Baldermann, Andre Wasser, Oliver Abdullayev, Elshan Bernasconi, Stefano Löhr, Stefan Wemmer, Klaus Piller, Werner E. Rudmin, Maxim Richoz, Sylvain |
spellingShingle |
Baldermann, Andre Wasser, Oliver Abdullayev, Elshan Bernasconi, Stefano Löhr, Stefan Wemmer, Klaus Piller, Werner E. Rudmin, Maxim Richoz, Sylvain Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
author_facet |
Baldermann, Andre Wasser, Oliver Abdullayev, Elshan Bernasconi, Stefano Löhr, Stefan Wemmer, Klaus Piller, Werner E. Rudmin, Maxim Richoz, Sylvain |
author_sort |
Baldermann, Andre |
title |
Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
title_short |
Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
title_full |
Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
title_fullStr |
Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
title_full_unstemmed |
Palaeo-environmental evolution of Central Asia during the Cenozoic:new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) |
title_sort |
palaeo-environmental evolution of central asia during the cenozoic:new insights from the continental sedimentary archive of the valley of lakes (mongolia) |
publishDate |
2021 |
url |
https://researchers.mq.edu.au/en/publications/12eb93b5-fecc-4837-8229-abfb4024e25e https://doi.org/10.5194/cp-17-1955-2021 https://research-management.mq.edu.au/ws/files/198999487/198647327.pdf http://www.scopus.com/inward/record.url?scp=85116386493&partnerID=8YFLogxK |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_source |
Baldermann , A , Wasser , O , Abdullayev , E , Bernasconi , S , Löhr , S , Wemmer , K , Piller , W E , Rudmin , M & Richoz , S 2021 , ' Palaeo-environmental evolution of Central Asia during the Cenozoic : new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) ' , Climate of the Past , vol. 17 , no. 5 , pp. 1955-1972 . https://doi.org/10.5194/cp-17-1955-2021 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-17-1955-2021 |
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Climate of the Past |
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17 |
container_issue |
5 |
container_start_page |
1955 |
op_container_end_page |
1972 |
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1802651436213862400 |