Foraminiferal responses to major Pleistocene paleoceanographic changes in the southern South China Sea

Zhimin Jian (1) , Pinxian Wang (1) , Min-Pen Chen (2) , Baohua Li , Quanhong Zhao (1) , Christian Bühring (3) , Carlo Laj (4, 5) , Hui-Ling Lin (6) , Uwe Pflaumann (3) , Yunhua Bian (1) , Rujian Wang (1) , Xinrong Cheng

1 Tongji University
2 Institute of Oceanography [Taipei]
3 Institut für Geowissenschaften [Kiel]
4 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
5 CLIMAG - Climat et Magnétisme
6 NSYSU - National Sun Yat-sen University

A detailed age model for core 17957‐2 of the southern South China Sea was developed based on δ18O, coarse fraction, magnetostratigraphy, and biostratigraphy for the last 1500 kyr. The δ18O record has clear ∼100‐kyr cycles after the Mid‐Pleistocene Revolution (MPR) at the entrance of marine isotopic stage (MIS) 22. Planktonic foraminifera responded to the MPR immediately, showing the increased sea surface temperature (SST) and dissolution after the MPR. Benthic foraminifera did not respond to it until the Brunhes/Matuyama boundary. Since the MPR, the depth of thermocline gradually became shallower until MISs 6–5. This major change within MISs 6–5 was also reflected in the decreased SSTs and increased productivity and Deep Water Mass. Thus two major Pleistocene paleoceanographic changes were found: One was around the MPR; the other occurred within MISs 6–5, which speculatively might be ascribed to the reorganization of surface and deep circulation, possibly induced by tectonic forces.

Domaines: Océanographie

Zhimin Jian, Pinxian Wang, Min-Pen Chen, Baohua Li, Quanhong Zhao, et al.. Foraminiferal responses to major Pleistocene paleoceanographic changes in the southern South China Sea. Paleoceanography, 2000, 15 (2), pp.229-243. ⟨10.1029/1999PA000431⟩. ⟨hal-03118508⟩