The relative changes of a sea surface temperature in the South China Sea since the Pliocene

作     者：Dongjie Bi Daojun Zhang Shikui Zhai Xinyu Liu Chun Xiu Xiaofeng Liu Aibin Zhang 

作者机构：Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education College of Marine Geosciences Ocean University of China Zhanjiang Branch Institute of China National Offshore Oil Corporation (CNOOC) Limited 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2019年第38卷第3期

页      面：78-92页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：The National Science and Technology Major Project of China under contract No.2011ZX05025-002-03 the Project of China National Offshore Oil Corporation(CNOOC)Limited under contract No.CCL2013ZJFNO729 the National Natural Science Foundation of China under contract No.41530963 

主　　题：the ratios of magnesium to calcium concentrations benthonic foraminifera sea surface temperature paleoclimatic events 

摘      要：The reconstruction of sea surface temperature(SST) is a key issue in research on paleoceanography. The recently related studies are mainly concentrated on the Quaternary. The skeletons of a typical species of benthonic foraminifer(Amphistegina radiata) in the top 0–375.30 m interval of Well Xike-1 reef core, Shidao Island, the Xisha Islands, are uniformly selected. The ratios of magnesium to calcium concentrations and other indicators are analyzed by an electron microprobe analysis(EMPA) with the purpose of estimating the paleo-SSTs since the Pliocene and further investigating the periodic change law of paleoclimate in the South China Sea(SCS).Meanwhile, the geologic significance of paleoclimatic events in the SCS is discussed with global perspectives. The results indicate that the paleo-SSTs reconstructed by the ratios of magnesium to calcium concentrations in the SCS show a general periodic trend of high–low–high–low in values changes since the Pliocene. By comparison,the fluctuations of reconstructed paleo-SSTs are much stronger in the Quaternary. Moreover, the variations of the ratios of magnesium to calcium concentrations in the A. radiata skeletons have recorded a series of major paleoclimatic events since the Pliocene, of which the Quaternary glaciation events and the Arctic ice cap forming events during the late Pliocene are more significant. Thus, using the changes of the ratios of magnesium to calcium concentrations in the A. radiata skeletons from Well Xike-1 reef core to reflect the relative changes of paleo-SSTs is a relatively feasible and reliable way in the SCS, which is also proved by the correlation of drilling cores characteristics in this area.