Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 578, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2021.117331
Keywords
Cenomanian-Turonian boundary; osmium isotopes; carbon cycle; southern Tibet; transgression; mid-Cretaceous greenhouse
Categories
Funding
- National Natural Science Foundation of China [41774075, 41888101]
- TOTAL Endowment Fund
- CUG Wuhan Dida Scholarship
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This study presents a high-resolution osmium isotope record from the OAE2 interval in southern Tibet, China. The record reveals intensified volcanism associated with the global onset of OAE2 and a correlation with a cold event in the Northern Hemisphere. These findings suggest that enhanced ocean connectivity played a critical role in triggering OAE2 globally.
Oceanic Anoxic Event 2 (OAE2) exemplifies an episode of global oceanographic and climatic changes in the mid-Cretaceous greenhouse. However, the timing and mechanism of its global initiation remain elusive. Here we report a high-resolution initial osmium isotope (Os-187/Os-188(i), Os-i) and delta C-13(org) record from an expanded OAE2 interval in southern Tibet, China that was deposited in the Southern Hemisphere. The Os-i record documents episodic, intensifying volcanism with the highest intensity episode marked by a large Os-i excursion at similar to 94.5 Ma and a subsequent similar to 200 kyr Os-i minimum concomitant with a cooling interval, which is broadly synchronous with the Plenus Cold Event (PCE) recorded in the Northern Hemisphere. Also, the large Os-i excursion lags the onset of OAE2 by similar to 50 kyr and occurred during a near synchronous global transgression based on high-resolution correlation with other major OAE2 records. These results are interpreted as indicating that enhanced ocean connectivity played a critical role in helping trigger the global onset of OAE2 at similar to 94.5 Ma. (c) 2021 Elsevier B.V. All rights reserved.
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