西北地质Issue(2)：150-158,9.
新疆西北部和什托洛盖盆地构造演化与后期走滑冲断改造
Tectonic Evolution,Strike-slip and Thrust Reformation of Hoxtolgay Basin in Northwestern Xinjiang,China
摘要
Abstract
Hoxtolgay basin,located in northwestern Xinjiang,is a Mesozoic-Cenozoic sedimentary basin developed on the thrust nappe system of the west Junggar orogenic belt formed in late Pale-ozoic.There exists an ongoing debate in understanding of the basin prototype and its evolutionary history in Mesozoic-Cenozoic period.To restore the history of formation and evolution,and de-termine the type of the basin,research ideas of reformed basin was applied to analysis of forma-tion and development of the basin,the comprehensive geological studies and seismic structural a-nalysis were carried out as well.Results show that the formation and evolution of Hoxtolgay Ba-sin in Mesozoic-Cenozoic age is mainly influenced by west Junggar orogeny,and can be subdivided into at least three basin formation and reformation periodssince Triassic,respectively Indosinian,Yanshanian and Himalayan period.The prototype of the basin in Indosinianis a compressional de-pression controlled by the east-westtrending Xiemisitaishan piedmont thrust fault,and developed an extensional depression with a large scale subsidence in Yanshan period.At late Yanshanian, the basin was strongly reformed by folding and thrusting,and the north-south ramp framework of the basin wasformed.The sedimentary area of the basin was greatly narrowed and restricted to the middle depression belt of the basin in late Yanshanian to Himalayan period,and mainly exhib-ited the characteristics of the reactivity and inheritance of the pre-existing faults.Although the tectonic stress fields and basin features are different in different stages of formation and develop-ment of the basin,their regional tectonic stress fields are generally the same or similar in the later stage of each basin development,mainly due to Xiemisitaishan Piedmont fault thrusting south-ward and Daerbute sinistral transpressional faulting.It is therefore concluded that Hoxtolgay ba-sin is generally a strike-slip and thrust reformed basin caused by the changes of the regional tec-tonic stress fields in the process of basin evolution.关键词
构造演化/应力场/走滑/冲断改造/和什托洛盖盆地Key words
tectonic evolution/stress field/strike-slip and thrust reformation/Hoxtolgay basin分类
天文与地球科学引用本文复制引用
孙自明..新疆西北部和什托洛盖盆地构造演化与后期走滑冲断改造[J].西北地质,2015,(2):150-158,9.基金项目
中国石化科技攻关项目“西部山前构造带构造建模与有利区带评价”(P07051) （P07051）
