库鲁克塔格地区震旦系冰碛岩沉积环境及意义

库鲁克塔格地区震旦系发育三层冰碛岩,分别是贝义西组、特瑞爱肯组、汉格尔乔克组.通过对冰碛岩沉积特点的研究,分析沉积环境.贝义西组冰碛砾岩夹于细粒碎屑岩及火山岩间,冰碛砾岩呈块状、无层理,为海洋冰川沉积;特瑞爱肯组主要为冰碛泥砾岩和冰碛砾岩夹粉砂岩、灰岩,块状、无层理、可见大漂砾,为冰下沉积;汉格尔乔克组主要为冰碛泥砾岩和冰碛砾岩,偶夹杂砂砾岩、砂岩透镜体,块状、无层理,为冰下沉积,顶部可见冰碛纹泥层,为冰湖沉积.

SEDIMENTARY ENVIRONMENT OF THE NEOPROTEROZOIC IN QURUQTAGH REGION

Three layers of tillites are developed in the Beiyixi formation,Teriaikan formation and Hangeerqiaoke formation of the Neoproterozoic in Quruqtagh region.Analysis of the sedimentary environment is made according to the characteristics of deposition.In the Beiyixi formation,tillite conglomerate are interbedded with granule clastic rocks and volcanic rocks.The tillites are glacio-marine sedimentary with nubby,stratification-lack structure.In the Teriaikan formation,siltstone and limestone are thinly interbedded with tillite conglomerates.Several large drift conglomerates existed.The tillites are subglacial sedimentary with nubby,stratification-lack structure.In the Hangeerqiaoke formation,the main lithologies are tillite muddy gravel and tillite conglomerate.Several lenticular sandstone and sandy gravels can occasionally be seen.The deposits are nubby and stratification-lack subglacial sedimentary.On the top of the Hangeerqiaoke formation there is a glacio-lake sedimentary sequence with tillite and pelite.