NEOPROTEROZOIC RIFTING HISTORY OF SOUTH CHINA SIGNIFICANCE TO RODINIA BREAKUP
NEOPROTEROZOIC RIFTING HISTORY OF SOUTH CHINA SIGNIFICANCE TO RODINIA BREAKUP
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发表时间：
2001
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通讯作者：
W. Jian
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作者：
W. Jian
华南新元古代盆地具有裂谷盆地的特征，其演化与罗迪尼亚裂解密切相关。1.盆地演化经历了四个主要发展阶段。（1）河流沿岸的-深水沉积阶段，（2）陆相-海相火山岩为主阶段，（3）大陆冰帽-大陆冰架海为主阶段，（4）碳酸盐和/或碳硅质沉积物形成阶段。2.高分辨离子探针（SHRIMP）测年结果表明，裂谷盆地的演化经历了4个阶段：（1）裂谷基底的形成;（2）地幔柱和地堑盆地的形成;（3）基底沉降和裂谷体充填;（4）被动沉降和裂谷盖层的形成。3.华南裂谷的研究表明：（1）新元古代晚期的裂谷作用是全球性的，Rodinia裂解后在各大陆周围形成了一批裂谷盆地。这一裂谷事件是澳大利亚与扬子分离（600 Ma~550 Ma）和劳伦提斯与华夏分离的主要原因。(2)华南地块位于冈瓦纳大陆东部、劳伦大陆和西伯利亚之间。
The Neoproterozoic basins in South China are characteristic of rift basins, and their evolutions are closely related to the breakup of Rodinia. 1. The basins evolution underwent four major development stages. (1)fluvial littoral to deeper water deposition stage; (2)continental to marine volcanic dominated stage, (3)continental ice cap to continental glacial shelf sea dominated stage, (4) carbonate and/or carbonaceous siliceous sediments formed stage. 2.The age determination by sensitive high resolution ion microprobe(SHRIMP) indicates that the evolution of rift basin experienced four stages:(1)the formation of the rift basement; (2)the formation of mantle plume and graben basin; (3)the subsidence of the basement and filling of the rift body, and (4)passive subsidence and formation of the rift cover. 3. The study of South China rift suggests that: (1) the rifting operated during the late Neoproterozoic was worldwide, which brought about a number of rift basins around individual continents after the breakup of Rodinia. This rifting event was responsible for the separation of Australia from Yangtze(600 Ma~550 Ma), and of Laurentia from Cathaysia. (2) The South China block lay between eastern Gondwanaland, Laurentia and Siberia.