摘要
在平面应变等的一级近似假定下 ,恢复了边缘盆地拉分后印度板块与欧亚板块相对压缩量和南海、日本海盆地的拉分量。得出两板块碰撞时 ,其间缝合线在现今位置南约 2 6°(沿东经 85°方向 ) ,南海北岸在现今位置南约 14°,日本海北岸相对西南日本在南约 4 5°位置 ,而西南日本岛本身在现今位置南约 8 5°位置。印度板块和欧亚板块碰撞后 ,加速了后者向北退却 ,西北太平洋边缘发生右行剪切 ,在老第三纪 (或至早中新世末 )形成南海、日本海、菲律宾海、苏禄海及苏拉维西海等右行拉分裂谷 ,它们共同构成巨大的连锁右行拉分裂谷系统 ,以保持运动学平衡。秦岭和贝加尔 -斯塔诺夫左行剪切带为该系统派生的R′断裂。在全球构造上 ,欧亚板块向北退却与美洲板块南移是和谐的 。
Based on the premise of plain strain thinned crust for the first order approximation,the paleo tectonics of northwest Pacific margin at the beginning of collision between Indian and Eurasian Plates have been reconstructed in this paper.The suture between the two plates was located at 26° southward,the north coast of South China Sea at about 14° southward,the north coast of Japan sea at about 4.5° south and Southwest Japan Island at about 8.5° south to the their present positions respectivily.The collision of Indian Plate and Eurasian Plate accelerated the north retreat of Eurasian Plate,caused right shear along the margin from Sumatera to Far East of Russia and the opening of marginal basins including South China Sea,Sulu Sea,Celebes Sea,Philippine Sea,Japan Sea,Okhotsk Sea and so on.These basins constituted a huge chain dextral pull apart rift system in order to be balanced kinematically,Qinling and Bajkalj Stanovoj was the derived sinistral R'fault belt.Globally,the north retreat of Eurasia Plate possibly harmonized with south shift of North American Plate,and in the east margin of Pacific Plate,San Andreas Fault took dextral displacement.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2000年第3期185-190,共6页
Oil & Gas Geology
基金
国家自然科学基金项目
关键词
西北太平洋
边缘盆地
拉分盆地
断裂
右行剪切
Northwest Pacific Margin
marginal basin
pull apart basin
Bajkal Stanov Fault
San Andreas Fault
right lateral shear
