摘要
由于柴达木盆地西部地区所处的独特地理位置和构造环境,在形成与演化过程中受周边3条巨型断裂带(阿尔金走滑断裂带、南祁连断裂带和昆仑断裂带)的控制和制约,构造演化过程和耦合关系非常复杂。通过利用裂变径迹测年法确定柴达木盆地西北地区中生代末期以来主要经历了2次大规模的构造事件,并结合前人对阿尔金走滑断裂带活动模式的研究和柴达木盆地西北部构造特征的分析,认为柴达木盆地西北地区中生代末期以来发生过2期大规模的构造运动,分别在白垩纪中期和新近纪早期。这2期构造运动在阿尔金走滑断裂的表现为早期的深部韧性走滑运动和晚期的整体大规模走滑运动;在柴达木盆地西北地区表现为深层和表层2套不协调的构造样式。
The Qaidam basin with its unique geographical position and structural environment was controlled by three large size circumferential faults （Altun Tagh strike-slip fault, south Qilian fault and Kunlun fault） during its formation and evolution. The tectonic evolution and coupling relationship are very complicated. Based on fission track age dating of apatite and zircon, in combination with previous model of Altun Tagh strike-slip fault and structural feature of northwestern Qaidam basin, two tectonic events in northwestern Qaidam basin after last Mesozoic age were determined, corresponding to mid-Cretaceous and early Neogene, respectively. In these two tectonic events, the Altun Tagh strike-slip fault was shown as early ductile strike slip and whole extensive strike slip later, whereas there are two settings of asynchronous structural types in the northwestern Qaidam basin.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2010年第2期212-217,共6页
Natural Gas Geoscience
基金
国家科技重大专项“大型油气田及煤层气开发”(编号:2008ZX05025)
国家科技重大专项“深层有效储集体形成、分布规律与预测技术”(编号:2008ZX05008-003)联合资助
关键词
柴达木盆地
阿尔金走滑断裂带
构造演化
裂变径迹年龄
Qaidam basin
Altun Tagh strike-slip fault
Tectonic evolution
Fission track age dating.
