摘要
综合新的区域资料,对影响莺歌海盆地发育的区域构造演化特征进行了系统分析,强调指出印支地块向东南方向的逃逸滑移过程中,次级地块的顺时针旋转极大地影响和控制了地块边缘盆地的发育。莺歌海盆地构造演化主要受控于红河断裂的左旋走滑和印支地块相对于华南地块的顺时针旋转作用,在此背景条件下,莺歌海盆地新生代以来的构造演化经历了3个阶段,即左旋走滑-伸展裂陷阶段、中下地壳韧性伸展-热沉降阶段和加速沉降阶段。莺歌海盆地构造演化动力学新模式的建立,对阐明南海西北部大陆边缘构造演化和盆地油气勘探均有重要意义。
Regional tectonic evolution affecting development of Yinggehai Basin is analyzed systematically by synthesis of new regional data.Authors consider that clockwise rotation of Indochina Block and inner secondary blocks during extrusion southeastwards of Indochina Block greatly affected and controlled basin generation in the margin of blocks.Tectonic evolution of Yinggehai basin was mainly controlled by sinistral strike slip and clockwise rotation of Indochina block relative to South China block,based on wiich three tectonic evolutionary phases are identified.They are sinistral strike-slip extension phase,ductile middle-lower crust extension and thermal subsidence phase,and accelerated subsidence phase.New dynamic evolutionary model on Yinggehai basin is of benefit to elucidate tectonic evolution of continental margin in the northwestern South China Sea and prospecting of oil and gas in the basin.
出处
《断块油气田》
CAS
2007年第2期33-35,共3页
Fault-Block Oil & Gas Field
关键词
莺歌海盆地
逃逸构造
伸展构造系统
地块旋转
Yinggehai Basin,extrusion tectonics,extension tectonic systems,block rotation.
