阿尔金断裂对柴达木盆地西南地区的影响——来自构造节理分析的证据  

Effect of Altyn Tagh Fault to Southwest Qaidam Basin:Evidences from Analysis of Joints Data

作　　者：尹成明[1] 任收麦[2] 田丽艳[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]国土资源部油气资源战略研究中心,北京100034 [3]吉林大学地质调查研究院,长春130061

出　　处：《吉林大学学报（地球科学版）》2011年第3期724-734,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40872127;40572135);国家油气专项项目(XQ-2004-01)

摘　　要：阿尔金断裂在100-85 Ma、40-25 Ma、10-8 Ma具有多期活动的特征。通过对柴达木盆地西南地区中-新生代地层中构造节理数据的采集、层面校正和综合分析,认为阿尔金断裂多期活动在柴达木盆地西南地区的表征存在差异：即晚白垩世断裂走滑活动对该地区的影响范围较窄,限于阿尔金山前附近;始新世上干柴沟组、中新世下油砂山组沉积之后,阿尔金断裂2期明显的走滑逆冲活动影响范围逐渐增大,可分别达到干柴沟、油砂山一带。这可能与南部青藏高原的多期推覆逆冲导致阿尔金断裂被动活化有关。因此,盆地西南地区油气勘探过程中阿尔金断裂3期走滑逆冲活动的影响值得重视。Altyn Tagh fault has experienced at least three periods strike-slip and thrust movement since 100-85 Ma,40-25 Ma,10-8 Ma respectively.In this paper,the author carried out joints data measurements in the Meso-Cenzoic strata of southwest Qaidam basin,and then deduced the stress direction applying the strata recovery technique to different formations.The results suggest that the effect of Altyn Tagh fault to southwest Qaidam basin is difference in various periods,that is,it is very narrow just along Altyn Tagh Mountains during Late Cretaceous,while it enlarge gradually to Ganchaigou anticline and Youshashan anticline during the Eocene Shangganchaigou epoch and Miocene Xiayoushashan epoch for two stages of strike-slip and thrust movement of Altyn Tagh fault.Perhaps,the structure joint phenomenon of Qaidam basin has some relationship with the multi-phase thrust of Tibet Plateau causing Altyn Tagh fault re-active at that time.Therefore,it is necessary to consider three strike-slip movements of Altyn Tagh fault in the exploration of petroleum produce of southwest Qaidam basin.

关 键 词：阿尔金断裂 柴达木盆地 构造 节理 

分 类 号：P548.7[天文地球—构造地质学]