First Record of Oceanic Anoxic Event 1d at Southern High Latitudes: Sedimentary and Geochemical Evidence From International Ocean Discovery Program Expedition 369

International audience Oceanic anoxic event 1d (OAE 1d) has been well studied at northern low latitudes (i.e., in Tethys and the North Atlantic); however, the paleoenvironmental response to this event at high latitudes has not been documented and the triggering mechanism remains unknown. Here, we ad...

Full description

Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Fan, Qingchao, Xu, Zhaokai, Macleod, Kenneth G., Brumsack, Hans-Jürgen, Li, Tiegang, Chang, Fengming, Wan, Shiming, Riquier, Laurent, Fu, Delong, Luan, Zhendong, Duan, Baichuan, Chen, Hongjin, Wang, Wei, Lim, Dhongil
Other Authors: Institut des Sciences de la Terre de Paris (iSTeP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2022
Subjects:
Online Access:https://hal-insu.archives-ouvertes.fr/insu-03691305
https://hal-insu.archives-ouvertes.fr/insu-03691305/document
https://hal-insu.archives-ouvertes.fr/insu-03691305/file/Geophysical%20Research%20Letters%20-%202022%20-%20Fan%20-%20First%20Record%20of%20Oceanic%20Anoxic%20Event%201d%20at%20Southern%20High%20Latitudes%20Sedimentary.pdf
https://doi.org/10.1029/2021GL097641
Description
Summary:International audience Oceanic anoxic event 1d (OAE 1d) has been well studied at northern low latitudes (i.e., in Tethys and the North Atlantic); however, the paleoenvironmental response to this event at high latitudes has not been documented and the triggering mechanism remains unknown. Here, we address both of these shortcomings by presenting the first detailed sedimentary and multi-proxy geochemical record of the OAE 1d at southern high latitudes (60-62°S), obtained from sediments using Site U1513, IODP Expedition 369. Biostratigraphic and chemostratigraphic data support correlation of the interval studied with OAE 1d, and the sedimentary mercury proxy reveals that at least at Site U1513, OAE 1d is associated with the Central Kerguelen large igneous province volcanism. Furthermore, the significant increase in continental runoff and consequent terrigenous input from southwestern Australia in the southeastern proto-India Ocean might have resulted in regionally weakened bottom-water oxygenation and strengthened organic matter burial during OAE 1d.