库鲁克塔格地区南华系贝义西组沉积环境及对南华纪裂谷盆地演化的指示  

Sedimentary Environment of Nanhuaan Bayisi Formation in Quruqtagh Domain and its Implications on the Evolution of the Nanhua Rift Basin

作　　者：魏震[1] 郭瑞清[1] 赵新生[1] 孙敏佳[2] 吕彪[1] 王克卓 

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830046 [2]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [3]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830011

出　　处：《新疆地质》2016年第3期331-337,共7页Xinjiang Geology

基　　金：中国地质调查局新疆兴地塔格阿匍口地区1:5万(K45E014010;K45E014011;K45E015010;K45E015011;K45E016011)等5幅区调项目(1212011120477)资助

摘　　要：为恢复南华纪初期库鲁克塔格地区的古地理环境和构造背景,利用该区贝义西组岩石特征、沉积构造和粒度分析等资料,对其非冰期沉积环境进行了系统分析。结果表明,贝义西组自下而上发育残坡积相、冲洪积扇扇根和扇中亚相、扇三角洲平原和前缘亚相、滨岸的临滨亚相及浅海相,为持续的海进过程,属拉伸背景下的沉积,符合裂谷盆地的沉积序列。其沉积环境很快由陆相演化至海相,缺乏湖相沉积,说明裂解迅速,指示南华纪早期库鲁克塔格可能处于Rodinia超大陆边缘。结合前人资料认为,其可能是三叉裂谷系一个伸向塔里木克拉通的分支。The sedimentary environment of nonglacial strata of Bayisi formation is discussed in this paper based on the data of its petrology, sedimentary structures, and grain size analysis etc.,shed light on the paleogeography and tectonic set- ting of early Nanhua in Quruqtagh domain.The results show that it is principally divided into residual slope facies,alluvi- al pluvial fan facies,fan delta facies,coastal and shallow sea facies,reflect a transgression process and indicated this basin was in a extensional setting.Its depositional sequence same to rift basin,but it has a high rates of extension,varying deposi- tional environment from land to marine quickly and lack of lacustrine facies,combined with previous data we can draw the conclusion that Quruqtagh was a branch into Tarim craton belong to a three armed rift system and sited at the margin of Rodinia supercontinent at early Nanhua.

关 键 词：库鲁克塔格 贝义西组 沉积环境 裂谷盆地 

分 类 号：P542[天文地球—构造地质学] P512.2[天文地球—地质学]