新疆卡拉麦里碰撞带南缘志留--泥盆纪沉积学研究新进展  

New research progress on Silurian and Devonian sedimentation in the southern margin of the Kalamaili collision belt,Xinjiang

作　　者：蔡雄飞[1] 廖群安[1] 王富明[2] 樊光明[1] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室、中国地质大学地球科学学院,武汉430074 [2]四川省地质矿产勘查开发局区域地质调查队,成都610213

出　　处：《华东地质》2016年第2期113-119,共7页East China Geology

基　　金：中国地质调查局地质调查项目“新疆东准噶尔卡拉麦里1∶50000(L45E017020、L45E017021、L45E018020、L45E018021、L45E016022)等5幅区调”(项目编号:1212011120508)

摘　　要：志留纪、泥盆纪是研究新疆卡拉麦里碰撞带发展、演化的关键时期。本文通过研究该区志留—泥盆纪的沉积学特征,认为志留纪白山包组为"风暴海"远岸沉积,而非单纯的"海滩"、"浅海"沉积。泥盆纪卡拉麦里组下段发现的重力流浊流沉积序列以及重力流水道相沉积,表明沉积环境为斜坡相—半深海相,而非"滨海相"。晚泥盆世克安库都克组发现的陆相磨拉石,显示陆一陆碰撞造山阶段的沉积,这些沉积记录了盆地形成、演化和造山过程,丰富了新疆卡拉麦里构造演化的研究内容,确定洋壳俯冲、陆陆碰撞的时间应为晚泥盆世。The Silurian and Devonian periods were critical ages for the development and evolution of the Kalamaili collision belt.By studying the Silurian and Devonian sedimentation in the southern margin of Kalamaili collision belt,it is concluded that the Baishanbao Formation in Silurian period should belong to infralittoral sediment called storm surge rather than sediment of beach or shallow sea.The gravity flow turbidite sequences and gravity flow drainage channel deposit discovered in the lower segment of the Kalamaili Formation indicate a sedimentary environment of slope to bathyal facies rather than littoral facies.Continental molasse discovered in the late Devonian Keankuduke Formation represents the sedimentary of continent-continent collisional orogeny,which records the formation,evolution and orogenic process of the basin.The result in this study not only enriches the research content of tectonic evolution in the Kalamaili collision belt,but confirms that oceanic crust subduction and continent-continent collision happened in late Devonian

关 键 词：碰撞带南缘 沉积学 志留一泥盆纪 克拉麦里 新疆 

分 类 号：P588.2[天文地球—岩石学]