柴北缘鱼卡断陷构造变形特征及变形环境  

Deformation Characteristics and Environment of Iqe Fault Depression in Northern Margin of Qaidam Basin

作　　者：曾春林[1] 姜波[1] 彭德华[2] 张飞燕[1] 汪焰华[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《中国煤炭地质》2008年第10期28-30,共3页Coal Geology of China

摘　　要：在鱼卡断陷及其周边构造变形系统观测的基础上,结合构造岩和构造煤显微构造分析,探讨了鱼卡断陷的构造变形特征及变形环境。研究表明,盆缘断裂构造变形强烈,具有强烈的塑性变形特征,反映了较高的应力—应变环境;而盆内断裂变形较弱,以脆性变形为主,反映出地壳浅层次构造变形环境的特征。区内至少经历了近NS向和NE向两期不同方向的挤压应力作用,但以近NS向的构造挤压作用为主,对煤层赋存状态具有较为强烈的改造和控制作用。Based on systematic observation of the Iqe fault depression and its circumjacent structural deformation, combined with micro-structural analysis on tectonites and tectonieally deformed coals, characteristics of structural deformation and environment of Iqe fault depression have been discussed. The results show that basin edge faults possesses characteristics of strong plastic deformation which reflects higher stress-strain environment; while faults in basin proper have weak deformation which reflects tectonic deformation environment of shallow crust. Iqe fault depression experienced 2 stages of different direction stresses, one was near NS direction, and the other was NE direction. The near NS stress was the main stress and has rather strong reforming and controlling effects on occurrence of coal seam.

关 键 词：柴达木 鱼卡断陷 构造变形 

分 类 号：P618.110.2[天文地球—矿床学]