南海新生代碳酸盐台地淹没事件记录的海底扩张  

SEA FLOOR SPREADING RECORDED BY DROWNING EVENTS OF CENOZOIC CARBONATE PLATFORMS IN THE SOUTH CHINA SEA

作　　者：吕炳全[1] 徐国强[1] 王红罡[1] 赵会民[1] 

机构地区：[1]同济大学海洋地质与地球物理系,上海200092

出　　处：《地质科学》2002年第4期405-414,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

摘　　要：本文通过对南海 4个碳酸盐台地及其淹没事件的分析来阐明南海海底扩张的演化史。南海碳酸盐台地出现在最大海底扩张期 ,淹没事件出现在海底扩张和地壳下降速率进一步加快时期 ,因而它记录了海底扩张的阶段性和不均一性。南海共经历了早中新世晚期(距今 1 7± 0 5Ma)、晚中新世早期 (距今 1 0 0～ 8 2Ma)和上新世早期 (距今 3 4～ 3 0Ma)等 3次大的淹没事件 ,表明南海经历了 3次大的海底扩张 。This paper depicted the history of sea floor spreading by analyzing the development of four carbonate platforms and their drowning events in the South China Sea. The carbonate platforms in the studied area usually appeared in the peak stage of sea floor spreading, while drowning events occurred during the acceleration period of sea floor spreading and crustal subsidence. Consequently, the phase and nonuniformity of sea floor spreading were recorded. Our study showed that the South China Sea experienced three major drowning events, namely, the late stage of Early Miocene (17 ± 0 5 Ma ago), the early stage of Late Miocene (10 0 ～ 8 2 Ma ago) and the early stage of Pliocene (3 4 ～ 3 0 Ma ago), indicating the existence of three major sea floor spreading in the studied area. The short term drowning events seemed to result from different kinds of geological processes related to sea floor spreading.

关 键 词：新生代 碳酸盐台地 淹没事件 海底扩张 南海 海平面变化 

分 类 号：P544.1[天文地球—构造地质学]