Stepwise paleoceanographic changes during the last deglaciation in the southern South China Sea Records of stable isotope and microfossils |
| |
| Authors: | Zhimin Jian Minben Chen Huiling Lin Pinxian Wang |
| |
| Institution: | (1) Laboratory of Marine Geology of State Education Commission, Tongji University, 200092 Shanghai, China;(2) Institute of Oceanography, Taiwan University, Taibei, China;(3) Institute of Marine Geology, Sun Yat-Sen University, Gaoxiong, China |
| |
| Abstract: | Quantitative analyses of microfossils and stable isotopic analysis were carried out for Core SCS-12 in the southwestern slope
of the South China Sea (SCS). A high-resolution paleoceanographic record for the last 13 ka was revealed with the AMS14C dates. The southern SCS has experienced stepwise paleoceanographic changes since the last deglaciation. The oxygen isotopic
stage 1/2 boundary around 12.05 ka B. P. and the end of the last deglaciation around 7.70 ka B.P. are two rapid change periods
(corresponding to the terminationIa and terminationIb, respectively), in between is a slow change period. The authors infer that the sea level stood at - 110 m before the terminationIa, roughly the same as today after the termination IB, and about - 50 m in between. Subsequently, the average winter sea surface temperature and salinity obviously increased while
paleo-productivity decreased since 12.05 ka B.P. The early Holocene CaCO3 preservation spike, coupled with a high abundance of pteropoda and CaCO3 content, occurred around 7.70 ka B. P.
Project supported by the National Natural Science Foundation of China (Grant Nos. 49576286 and 49732086). |
| |
| Keywords: | last deglaciation stepwise change stable isotope microfossils South China Sea |
| 本文献已被 SpringerLink 等数据库收录！ |
|
