Quaternary high-resolution opal record and its paleoproductivity implication at ODP Site 1143,southern South China Sea  

作　　者：WANG Rujian & LI Jian Laboratory of Marine Geology, MEO, Tongji University, Shanghai 200092, China 

出　　处：《Chinese Science Bulletin》2003年第4期363-367,共5页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.49946011 and 49999560);the National Key Basic Research Special Foundation Project(Grant No.G2000078500);by the Foundation for the Authors of National Excellent Doctoral Dissertation of China(Grant No.200l26);the Foundation for University Key Teachers by the Ministry of Education.

摘　　要：The correlation of opal content and MAR with oxygen isotopic records of benthonic foraminifera at Site 1143, southern South China Sea indicates that, since about 900 ka, the increasing opal content and MAR during the interglacial periods is inferred to reflect the higher surface productivity, for the intensified summer monsoon during the interglacial periods would result in the enhanced upwelling and nutrient supply. Time-sequence spectral analyses of oxygen isotopic record, opal content and MAR at intervals of 0900 ka reveal that the changes of surface productivity were dominantly forced by the variations of the earth orbital cycles.The correlation of opal content and MAR with oxygen isotopic records of benthonic foraminifera at Site 1143, southern South China Sea indicates that, since about 900 ka, the increasing opal content and MAR during the interglacial periods is inferred to reflect the higher surface productivity, for the intensified summer monsoon during the interglacial periods would result in the enhanced upwelling and nutrient supply. Time-sequence spectral analyses of oxygen isotopic record, opal content and MAR at intervals of 0900 ka reveal that the changes of surface productivity were dominantly forced by the variations of the earth orbital cycles.

关 键 词：中国南海 第四纪 蛋白石含量 MAR 古生产力 四膜虫 沉积物 氧同位素 

分 类 号：P736.3[天文地球—海洋地质]