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

• 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: CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Chinese Academy of Sciences Beijing (CAS), Center for Ocean Mega-Science Qingdao, Chinese Academy of Sciences Changchun Branch (CAS), Center for Excellence in Quaternary Science and Global Change Xi'an, Department of Geological Sciences, University of Missouri, University of Missouri Columbia (Mizzou), University of Missouri System-University of Missouri System, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Key Laboratory of Marine Sedimentology and Metallogeny, Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, Laboratory for Marine Geology, Université Paris Diderot - Paris 7 (UPD7), CAS Institute of Oceanology (IOCAS), Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology Qingdao, Chinese Academy of Sciences, Institute of Oceanology, Chinese Academy of Sciences Qingdao, 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), College of Meteorology and Oceanography Changsha, National University of Defense Technology China, Key Laboratory of Marine Geology and Environment China, Institute of Oceanology China, University of Chinese Academy of Sciences Beijing (UCAS), South Sea Research Institute, Korea Institute of Ocean Science & Technology, Geoje 53201
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: International Ocean Discovery Program; southern high latitudes; oceanic anoxic event 1d; volcanism; paleoenvironmental changes; [SDU]Sciences of the Universe [physics]; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Kerguelen; North Atlantic
• Online Access: https://insu.hal.science/insu-03691305; https://insu.hal.science/insu-03691305/document; https://insu.hal.science/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

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.