| BI Dongjie,ZHANG Daojun,ZHAI Shikui,LIU Xinyu,XIU Chun,LIU Xiaofeng,ZHANG Aibin. 2019. The relative changes of a sea surface temperature in the South China Sea since the Pliocene. Acta Oceanologica Sinica, 38(3):78－92 |
| The relative changes of a sea surface temperature in the South China Sea since the Pliocene |
| 上新世以来南海海水表层温度（SST）的变化 |
| Received:November 15, 2017 |
| DOI：10.1007/s13131-019-1401-y |
| Key words:the ratios of magnesium to calcium concentrations benthonic foraminifera sea surface temperature paleoclimatic events |
| 中文关键词: Mg/Ca比值法 有孔虫（双盖虫） 古海水表层温度（SST） 古气候变化事件 |
| 基金项目: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. |
| Author Name | Affiliation | E-mail | | BI Dongjie | Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | | | ZHANG Daojun | Zhanjiang Branch Institute of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | ZHAI Shikui | Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | zhai2000@ouc.edu.cn | | LIU Xinyu | Zhanjiang Branch Institute of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | XIU Chun | Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | | | LIU Xiaofeng | Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | | | ZHANG Aibin | Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 重建古海水表层温度（SST）及其发展演化历史是古海洋学研究的重要内容之一。长期以来，古海水SST的恢复及历史重建主要集中在第四纪。本文取西沙石岛“西科1井”钻井岩心顶部375.30m层段，并统一选取其中典型的有孔虫（双盖虫）壳体化石，利用电子探针（EMPA）微区分析技术，分析获得Mg/Ca比值等指标，据此估算了南海上新世以来的SST变化历史，旨在探讨南海海区的古气候阶段性变化规律，并从全球变化的视角分析南海古气候变化与全球重大古海洋学事件之间的联系。研究结果表明，上新世以来南海SST总体呈“高温-低温-高温-低温-高温-低温”的旋回式变化，但自第四纪以来SST波动性变化加剧。有孔虫壳体中Mg/Ca比值变化记录了上新世以来的一系列全球重大古海洋事件，其中以第四纪大冰川事件和上新世晚期的北极冰盖形成事件最为显著。区域钻井岩心对比发现，利用“西科1井”岩心有孔虫壳体中Mg/Ca比值变化来反映南海古海水温度的相对变化具有很好的可行性和可靠性。 |
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