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Transition of Quaternary glacial cyclicity in deep-sea records at Nansha,the South China Sea

Transition of Quaternary glacial cyclicity in deep-sea records at Nansha, the South China Sea

作     者:汪品先 田军 成鑫荣 

作者机构:1. Key Laboratory of Marine Geology Ministry of Education Tongji University 200092 Shanghai China 

出 版 物:《Science China Earth Sciences》 (中国科学(地球科学英文版))

年 卷 期:2001年第44卷第10期

页      面:926-933页

核心收录:

学科分类:070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基  金:the National Natural Science Foundation of China (Grant No. 49999560) and NKBRSF Project (Grant No. 2000078500) 

主  题:Quaternary glacial cycles Mid-Pleistocene Revolution oxygen isotope stages Nansha area 

摘      要:High-resolution oxygen isotope records over the last 2249 ka (MIS 1-86) have been obtained from cores of the upper section (105.08 m) at ODP Site 1143 (water depth of 2772 m)drilled in the Nansha area, southern South China Sea. The sampling resolution is at about 2 ka intervals, resulting in one of the best oxygen isotope records over the global ocean. The oxygen isotope curves, displaying details in the Pleistocene glacial cycles, have revealed a nearly 300 ka long stage of transition from a predominant 40 ka to 100 ka periodicity. Therefore, the Mid-Pleistocene Revolution should be considered as a process of transition rather than an abrupt change. Within the 100 ka glacial cycles, the changes in tropical sea surface water were found to lead those in high-latitude ice sheet. Our comparisons show that the ice sheet expansion and the glacial stage extension in the Northern Hemisphere with the 100 ka cycles must have been driven not by ice sheet itself, but by processes outside the high latitudes of the Northern Hemisphere.

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