南海南部普林虫与“中更新世革命”  

Mid-Pleistocene Revolution Recorded by Pulleniatina obliquiloculata in the Southern South China Sea

作　　者：徐建[1] 汪品先[1] 黄宝琦[2] 翦知湣[1] 

机构地区：[1]同济大学海洋地质教育部重点实验室,上海200092 [2]北京大学环境学院,北京100871

出　　处：《地球科学（中国地质大学学报）》2004年第1期7-14,共8页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展规划项目 (No .G2 0 0 0 0 785 0 0 ) ;国家自然科学基金项目 (No .499995 60 ) .

摘　　要：对南海南部ODP 114 3站 2 .1Ma以来沉积物中的浮游有孔虫群进行研究 ,发现在冲绳海槽及南海北部普遍被认为是黑潮标志种的Pulleniatinaobliquiloculata在中更新世革命 (MPR)前后对冰期旋回的响应截然相反 ;且在MPR之后的变化与南海北部和冲绳海槽相反 ,即冰期时含量高而间冰期时低 .交叉频谱分析和相位分析的结果也证实了ODP 114 3站P .obliquiloculata与全球冰量变化之间的上述关系 .该种在MPR前后冰期旋回的转变 ,可能是由于MPR之后南海南部在冰期时切断了与印度洋之间的海水交换 ,或者是冰期时海水盐度增加等因素引起的上部水体结构的重大改观所致 .Planktonic foraminifers from ODP Site 1143, southern South China Sea (SCS), were analyzed to reveal their response to glacial cycles in the past 2.1 Ma. Pulleniatina obliquiloculata, a widely-accepted indicator of the Kuroshio, shows completely reverse fluctuations, with high abundance in glacials, in southern SCS to those in the Okinawa trough and northern SCS since the Mid-Pleistocene Revolution (MPR). Before the MPR, P. obliquiloculata is abundant in interglacial intervals. Cross-spectral and phase analyses between P. obliquiloculata and δ^(18)O confirmed the observations depicted above. The authors ascribed the transition of P. obliquiloculata's response to glacial cycles in southern SCS to a profound change in the regional upper ocean structure, probably related to glacial separation of the southern SCS from the Indian water and to higher surface salinity during glacial times after the MPR.

关 键 词：冰期旋回 中更新世革命 MPR 南海南部 浮游有孔虫群 沉积物 普林虫 

分 类 号：P736[天文地球—海洋地质]