Abstract：
:Cenozoic climate cooling at the advent of the Eocene-Oligocene transition (EOT), ~33.7 Ma ago, was stamped in the ocean by a series of climatic events albeit the impact of this global climatic transition on terrestrial environments is still fragmentary. Yet archival constraints on Late Eocene atmospheric circulation are scarce in (tropical) monsoonal Asia, and the paucity of terrestrial records hampers a meaningful comparison of the long-term climatic trends between oceanic and continental realms. Here we report new sedimentological data from the Jianchuan basin (SE Tibet) arguing for wetter climatic conditions in monsoonal Asia at ~35.5 Ma almost coevally to the aridification recognized northwards in the Xining basin. We show that the occurrence of flash-flood events in semi-arid to sub-humid palustrine-sublacustrine settings preceded the development of coal-bearing deposits in swampy-like environments, thus paving the way to a more humid climate in SE Tibet ahead from the EOT. We suggest that this moisture redistribution possibly reflects more northern and intensified ITCZ-induced tropical rainfall in monsoonal Asia around 35.5 Ma, in accordance with recent sea-surface temperature reconstructions from equatorial oceanic records. Our findings thus highlight an important period of climatic upheaval in terrestrial Asian environments ~2-4 millions years prior to the EOT.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Sorrel P,Eymard I,Leloup PH,Maheo G,Olivier N,Sterb M,Gourbet L,Wang G,Jing W,Lu H,Li H,Yadong X,Zhang K,Cao K,Chevalier ML,Replumaz Adoi
10.1038/s41598-017-07766-9subject
Has Abstractpub_date
2017-08-10 00:00:00pages
7809issue
1issn
2045-2322pii
10.1038/s41598-017-07766-9journal_volume
7pub_type
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