东天山三道岭地区泥盆纪岩石地层单位厘定

Division of the Devonian Lithostratigraphic Units in Sandaoling area,Eastern Tianshan

1:25万三道岭幅区调项目对前人在该区建立的各组级岩石地层单元进行了梳理和对比研究。参照《新疆维吾尔自治区岩石地层》(1999)指导意见,建立研究区地层统一的填图单元。该区泥盆系岩石地层研究取得如下进展:将泥盆系划分为下泥盆统大南湖组、中泥盆统头苏泉组和上泥盆统康古尔塔格组;将下涝坝芨芨台子一带和布尔汗库都克南部一带原大南湖组厘定为下石炭统黑山头组和上石炭统七角井组;通过锆石U-Pb定年,将巴里坤萨尔乔克一带中泥盆统头苏泉组重新厘定为上奥陶统乌列盖组;下涝坝乡312省道北原下石炭统雅满苏组下部厘定为康古尔塔格组,上部厘定为下石炭统黑山头组,二者呈整合接触。对研究区泥盆系岩石地层单位的研究,确定了各组分布范围和地质时代,对确立研究区地层层序,提高地层划分及对比精度具重要意义。

Based on lithology, facies,tectonic division and paleontological data, 1：250 000 regional geological surveying of Sandaoling divided Devonian strata into three lithostratigraphic units ： Dananhu Formation,Tousuquan Formation and Kangguertage Formation,and revised the area of the former Dananhu Formation as Heishantou formation and Qijiaojing formation.According to zircon U-Pb dating,the geological age of former Tousuquan Formation in Saerqiaoke was revised as Wuliegai Formation of the Late Ordovician;The project also found contact relationship of strata between Kangguertage Formation and Heishantou formation were conformity.The research of Devonian stratigraphic unit in study area confirmed the distribution range of every formation and their geological age,which is very important for us to establish the stratigraphic sequences in study area,and improve the accuracy of stratigraphic division and comparison.