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

Qingchao Fan (1, 2, 3) , Zhaokai Xu (2, 3, 1, 4) , Kenneth G. Macleod (5) , Hans-Jürgen Brumsack (6) , Tiegang Li (7, 8) , Fengming Chang (3, 9, 10) , Shiming Wan (11) , Laurent Riquier (12) , Delong Fu (13, 14) , Zhendong Luan (3, 2, 11, 15) , Baichuan Duan (1) , Hongjin Chen (1, 16) , Wei Wang (1, 16) , Dhongil Lim (17)

1 CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071
2 CAS - Chinese Academy of Sciences [Beijing]
3 Center for Ocean Mega-Science [Qingdao]
4 Center for Excellence in Quaternary Science and Global Change [Xi'an]
5 Department of Geological Sciences, University of Missouri
6 ICBM - Institute for Chemistry and Biology of the Marine Environment
7 Key Laboratory of Marine Sedimentology and Metallogeny
8 Laboratory for Marine Geology,
9 IOCAS - CAS Institute of Oceanology
10 Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology [Qingdao]
11 Institute of Oceanology, Chinese Academy of Sciences [Qingdao]
12 iSTeP - Institut des Sciences de la Terre de Paris
13 College of Meteorology and Oceanography [Changsha]
14 National University of Defense Technology [China]
15 Key Laboratory of Marine Geology and Environment [China
16 UCAS - University of Chinese Academy of Sciences [Beijing]
17 South Sea Research Institute, Korea Institute of Ocean Science & Technology, Geoje 53201

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.

Mots clés: International Ocean Discovery Program; southern high latitudes; oceanic anoxic event 1d; volcanism; paleoenvironmental changes; International Ocean Discovery Program; International Ocean Discovery Program; International Ocean Discovery Program

Domaines: Planète et Univers [physics]; Sciences de la Terre

Qingchao Fan, Zhaokai Xu, Kenneth G. Macleod, Hans-Jürgen Brumsack, Tiegang Li, et al.. First Record of Oceanic Anoxic Event 1d at Southern High Latitudes: Sedimentary and Geochemical Evidence From International Ocean Discovery Program Expedition 369. Geophysical Research Letters, 2022, 49, 326, p. 56-76. ⟨10.1029/2021GL097641⟩. ⟨insu-03691305⟩