中国中始新世—早更新世构造事件与应力场

TECTONIC EVENTS AND STRESS FIELDS OF MIDDLEEOCENE- EARLY PLEISTOCENE IN CHINA

中始新世—渐新世(52—23．3Ma)的华北构造期是以太平洋板块朝NWW方向位移为主要特征,使我国大陆受到近东西向的挤压,造成一系列近南北向的褶皱、逆掩断层和许多走向近东西的正断层、单断箕状盆地。此构造事件的发生可能与始新世末期北美、加勒比海和东太平洋的大量微玻璃陨石的坠落、冲击有关。中新世--早更新世(23．3~0．7Ma)的喜马拉雅构造期是以印度—澳大利亚板块与菲律宾海板块向北推移为主要特征,造成喜马拉雅山和日本列岛南部的俯冲带,使我国西部发育走向近东西的褶皱、逆掩断层系,而在东部地区则形成许多走向近南北的深切地幔的正断层系.并使南海与日本海再次张开。出现洋壳。喜马拉雅构造事件可能与印度洋、南亚、澳大利亚附近地区的微玻璃陨石群的冲击有关。

The Pacific tectonic event (Middle Eocene - Oligocene . 52-23.3 Ma) was character ized by the WNW moving direction of the Pacific Ocean plate . as a result . the China conti nent was undergoen the ESE orientation compression, formed a series of near north south trending folds,thrusts and many near east west trending normal faults and simple faulted basins. The occurrence of that event may be related to the dropping and impact of micro-tektites in North American. Caribbean Sea and Eastern Pacific Ocean in the end of Eocene epoch. The Himalayan tectonic event (Miocene - Early Pleistocene. 23.3 - 0.7 Ma) was charcterized by the north toward moving of Indian - Australian Plate and Philippine Sea Plate, formed the Himalaya Mountain and the subduction of southern Japan Islands, as a result, developed almost east - west trending fold and thrust system in western China, formed many north south trending normal fault system which cut into mantle, and let the South China Sea and Japan Sea to respread and the arising of the ocean crust. The Hi malayan event is related to the impact of micro-tektites around the Indian Ocean.