西准噶尔晚泥盆世新建岩石地层单位:塔克台组  

Taketai Formation:A New Lithostratigraphic Unit of Late Devonian in Western Junggar

作　　者：纵瑞文[1] 王志宏[1] 龚一鸣[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,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2015年第5期763-776,共14页Earth Science-Journal of China University of Geosciences

基　　金：新疆1:25万铁厂沟镇幅(L45C002001)与克拉玛依市幅(L45C003001)区调修测项目(No.1212011120502);西准噶尔克拉玛依后山地区深部地质调查试点项目(No.1212011220245);国家自然科学基金项目(No.41290260);高等学校博士学科点专项科研基金项目(No.20120145110012)

摘　　要：西准噶尔塔克台高原周围一套碎屑岩地层曾被划为下石炭统和布克河组(洪古勒楞组的晚出异名),但其岩性组合、沉积环境与化石面貌均与和布克河组或洪古勒楞组的定义不符,也难以归纳到区域上其他已知地层单元中,故以此建立一个新的岩石地层单位:塔克台组,并分为上、下2段:下段为火山碎屑岩夹火山岩,上段为正常碎屑岩、火山碎屑岩、钙质碎屑岩夹少量灰岩、火山岩和薄煤层.该组与下伏文洛克统沙尔布尔组呈角度不整合接触,上未见顶,多门类动植物化石的发现限定了该组的时代为晚泥盆世,形成于水体逐渐变浅的滨、浅海至沼泽环境.塔克台组与邻区同期的朱鲁木特组、洪古勒楞组为同时异相关系,晚泥盆世研究区海水从西向东侵入并退出是造成这种同时异相关系的主要原因.Based on the lithological association and sedimentary environments, the clastic stratal succession around the Taketai plateau in western Junggar is named as a new lithostratigraphic unit--Taketai Formation, which was previously assigned to the Early Carboniferous Hebukehe Formation. Taketai Formation can be subdivided into two members; the lower part is made up of volcanoclastic rocks intercalated with volcanic rocks, while the upper part is characterized by normal clastic rocks, volca- noclastic rocks and calcareous elastic rocks with a few limestones, volcanic rocks and thin coal seams. The Taketai Formation overlies the Wenlock Shaerbuer Formation in angular unconformity and its top is covered with Quaternary deposits. According to conodonts and other fossils preserved in the formation, Taketai Formation is considered to be the Late Devonian. It is formed from the littoral-neritic sea to swamp in a regression background. The same time-different stratum units of the Taketai Formation include the Zhulumute and Hongguleleng formations in adjacent regions, and it was caused by the Late Devonian marine transgression and regression from west to east in the study area.

关 键 词：塔克台组 晚泥盆世 岩石地层单位 和布克河组 洪古勒楞组 西准噶尔 地层学 沉积学. 

分 类 号：P535[天文地球—古生物学与地层学]