| BI Dongjie,ZHANG Daojun,ZHAI Shikui,LIU Xinyu,XIU Chun,LIU Xiaofeng,ZHANG Aibin.The relative changes of a sea surface temperature in the South China Sea since the Pliocene[J].Acta Oceanologica Sinica,2019,38(3):78-92 |
| 上新世以来南海海水表层温度（SST）的变化 |
| The relative changes of a sea surface temperature in the South China Sea since the Pliocene |
| 投稿时间：2017-11-15 |
| DOI：10.1007/s13131-019-1401-y |
| 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 |
| 英文关键词:the ratios of magnesium to calcium concentrations benthonic foraminifera sea surface temperature paleoclimatic events |
| 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. |
| 作者 | 单位 | E-mail | | 毕东杰 | 中国海洋大学, 海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 山东 青岛 266100 | | | 张道军 | 中海石油(中国)有限公司, 湛江分公司研究院, 广东 湛江 524057 | | | 翟世奎 | 中国海洋大学, 海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 山东 青岛 266100 | zhai2000@ouc.edu.cn | | 刘新宇 | 中海石油(中国)有限公司, 湛江分公司研究院, 广东 湛江 524057 | | | 修淳 | 中国海洋大学, 海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 山东 青岛 266100 | | | 刘晓锋 | 中国海洋大学, 海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 山东 青岛 266100 | | | 张爱滨 | 中国海洋大学, 海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 山东 青岛 266100 | |
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| 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。 |
| 英文摘要: |
| 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. |
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