石油与天然气地质 ›› 2000, Vol. 21 ›› Issue (3): 185-190.doi: 10.11743/ogg20000301

• 前沿探索 •    下一篇

西北太平洋边缘新生代盆地成因(中):连锁右行拉分裂谷系统

许浚远, 张凌云   

  1. 中国地质大学石油系,湖北武汉430074
  • 收稿日期:1999-11-16 出版日期:2000-09-25 发布日期:2012-01-16
  • 基金资助:

    国家自然科学基金项目

GENESIS OF CENOZOIC BASINS IN NORTHWEST PACIFIC MARGIN(2): LINKED DEXTRAL PULL-APART BASIN SYSTEM

Xu Junyuan, Zhang Linyun   

  1. Department of Petroleum Geology, China University of Geosciences, Wuhan
  • Received:1999-11-16 Online:2000-09-25 Published:2012-01-16

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26°(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,东太平洋边缘形成诸如圣安德列斯右行平移断裂。

关键词: 西北太平洋边缘, 边缘盆地, 拉分盆地, 贝加尔-斯塔诺夫断裂, 圣安德列斯断裂, 右行剪切

Abstract:

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 Chian 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.

Key words: Northwest Pacific Margin, marginal basin, pull-apart basin, Bajkal-Stanov Fault, San Andreas Fault, right-lateral shear

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