Microtektites in the Middle Pleistocene deep-sea sediments of the South China Sea  

作　　者：赵泉鸿 翦知湣 李保华 成鑫荣 汪品先 

出　　处：《Science China Earth Sciences》1999年第5期531-535,共5页中国科学（地球科学英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 49676287, 49732060).

摘　　要：This is a preliminary study on the microtektites that were found in large numbers from the interval between 7.80 and 8.10 m depth of core S095-17957-2 (10°53.9’N, 115°18.3’E, water depth 2 195 m), northern Nansha area of the South China Sea. The microtektites vary in shape, with spherules predominating, and are commonly less than 1 mm in diameter, transparent or semitransparent, brownish in color, with bubbles inside. Based on coarse fraction stratigraphy and foraminifera/nanofossil biostratigraphical events the microtektite layer was assigned to nearly the Bm-hes/Matuyama magnetic reversal boundary (some 0.78 MaBP). Obviously, the present microtektites, and those found from the middle Pleistocene of the Indian Ocean, Australia and loess of northern China, were products of the same impact event and therefore, are useful as a reliable mark in Quaternary stratigraphy, as well as in paleoclimatic studies.This is a preliminary study on the mierotektites that were found in large numbers from the interval between 7.80 and 8.10 m depth of core SO95-17957-2 (10°53.9′N, 115°18.3′E, water depth 2195m), northern Nansha area of the South China Sea. The microtektites vary in shape, with spherules predominating, and are commonly less than 1 mm in diameter, transparent or semitransparent, brownish in color, with bubbles inside. Based on coarse fraction stratigraphy and foraminifera/nanofossil biostratigraphieal events the microtektite layer was assigned to nearly the Brunhes/Matuyama magnetic reversal boundary (some 0.78 MaBP). Obviously, the present mierotektites, and those found from the middle Pleistocene of the Indian Ocean, Australia and loess of northern China, were products of the same impact event and therefore, are useful as a reliable mark in Quaternary stratigraphy, as well as in paleoclimatic studies.

关 键 词：MICROTEKTITES coarse FRACTION GEOLOGICAL age SOUTH China Sea. 

分 类 号：P736.2[天文地球—海洋地质]