摘要
在西天山的构造演化中，至少发生了三个变形旋回和六个变形世代的构造事件，并伴随着密切相关的沉积事件、变质事件和岩浆事件。这些变形序列的详细研究，为认识西天山地区地质发展历史和找矿方向提供了科学依据。
The tectonic evolution of west Tianshan includes three deformation cycles and six deformation generations, which bear close relationship with sedimentary,metamorphic and magmatic events.The first deformation generation(early palaeozoic or earlier) is characterised by tight fold, compression schistosity and injection of magma.The second generation(Silurian to Devonian) is indicated by ductile shearing and structural transposition and by melange zone and metamorphic zone of high pressure and low temperature.The third generation(Carboniferous to early Permain) results in nappe structure,superimposed fold, and metamorphism of lower greenschist factes.The fourth generation(late Permian to Triassic)is consistent with late orogenic extension and stress relaxation with resultant extensional fsults,tensile breccia,intrusion of A-type granite and extrusion of basaltic magma.Orogenic belt obducting and strike-slip faults are characteristic of the fifth deformation generation(Jurassic to Eogene).The sixth generation(Neogene to Quaternary) are characterrzed by block faulting with obducting and strike-slip movements.Based on the study of the deformation succession,theoretical bases are provided for understanding the geologic history and for prospecting mineral deposits of the West Tianshan area.
出处
《高校地质学报》
CAS
CSCD
1995年第1期41-49,共9页
Geological Journal of China Universities
关键词
变形序列
变形旋回
应变测量
西天山
新疆
Deformation succession, deformation cycle,strain measurement,fabric,westTianshan.
