摘要
通过对东昆仑山木孜塔格—鲸鱼湖断裂在青藏高原北部陆内变形过程中形成的构造形迹、沉积建造、新生代火山活动、地球物理场变化综合研究,以野外第一手资料重建该过程的演化历史,认为木孜塔格—鲸鱼湖断裂是青藏高原北部陆内变形过程遗留的重要地质证据,卫星遥感图像上显示极为明显,它具有重要的区域构造意义。首先,发育大规模由北向南的叠瓦式逆冲推覆构造,新近纪由南向北沿构造带分布着东西向平行排列的"堑垒"相间式断陷盆地;其次还见有大量中性火山岩浆沿该断裂及其次级断裂溢出分布,成因分析表明其来源于陆内俯冲作用;第三,该断裂的走向延伸线上现今还发生较大规模的地震活动。综合分析表明,该断裂作为与柴达木地块南部构造边界断裂彼此平行的南东东向大型走滑断裂带,具有左行走滑构造分量,应是青藏高原北缘亚洲大陆向北东逃逸的主要断裂系统。
Through the comprehensive research of structural features and sedimentary formation and volcanic activity of Cenozoic Era and the change of geophysics field and geotectonic movement which were formed in the process of intra-continental deformation variant of the northern Tibetan plateau, through the fracture of Muztag-Cetacean lake of eastern Kunlun mountain. We reconstruct the development history of the process through combatively true outdoor first-hand datum. We think that the fracture of Muztag-Cetacean Lake is an important remained geological evidence of the process of continental deformation of the northern Tibetan plateau, which is very clear on the satellite remote sensing image and which has an important regional structural meaning. Besides the imbricate thrust nappe structures which are formed from north to south on a large scale. Neocene stratum distributed west-east faulted basin of graben and horst intermittent model of parallel distributed which are in the line of structural zone from south to north. At the same time there is a lot of moderate volcanic lava erupted from Muztag-Cetacean Lake fracture and it's under grade fracture structure. The source come from continental conducted action from the analysis of volcanic rocks origin. Besides, there is seismic activity on a large scale in the strike stretching line of this fracture. Comprehensive analysis indicates that Muztag-Cetacean Lake fracture as a large north-east-east directing strike-slip fracture zone which is parallel with the fracture of structural margin of south Chasidim block should has structural part of left strike-slip, which is the main fractural system of Asia continent to the north margin of Tibetan plateau which escaped to northeastern direction.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2004年第4期418-427,共10页
Geotectonica et Metallogenia
基金
中国地质调查局地质调查项目(编号:1999130009191)资助.
关键词
东昆仑
木孜塔格—鲸鱼湖断裂
逆冲推覆构造
变形序列
陆内变形
eastern Kunlun
fracture zone of Muztag-Cetacean Lake
nappe
deformation sequence
intra-continental deformation variant
