贵州天柱大河边地区寒武系“九门冲组”“灰岩夹层”来源浅析——以天柱寨脚重晶石矿勘查区为例  

Analysis of Material Source of‘Limestone Interlayer’in Jiumenchong Formation,Cambrian System in Dahebian Area of Tianzhu County,Guizhou——Zhaijiao Barite Ore in Tianzhu is Taken as an Example

作　　者：杨光忠[1] 罗邦良 杨贵龙 林泽渊 王文杰[1] YANG Guang-zhong;LUO Bang-liang;YANG Gui-long;LIN Ze-yuan;WANG Wen-jie(Geological Party,Guizhou Bureau of Geology and Mineral Exploration&Development,Kaili 556000,Guizhou,China)

机构地区：[1]贵州省地矿局101地质大队,贵州凯里556000

出　　处：《贵州地质》2022年第3期245-250,261,共7页Guizhou Geology

基　　金：贵州天柱坪地向斜重晶石矿床找矿模式与深部三维预测研究(黔地矿科合〔2021〕24号)。

摘　　要：据《中国区域地质志·贵州志》(2017),寒武系九门冲组定义为有机质灰岩(偶)夹炭质粘土岩,天柱大河边地区寒武系划归黔东南地层分区的三都小区,牛蹄塘组—变马冲组乃至杷榔组—乌训组,因岩性均为炭质黏土岩及炭质粉砂岩而统称为渣拉沟组。天柱寨脚重晶石矿勘查所划分的“九门冲组”,主要岩性为炭质黏土岩夹0-8层(套)灰岩建造,厚度分别从几十厘米至14.23 m不等,产出部位高低不定,而且灰岩建造普见典型的滑塌滑移变形构造,结合乌训组滑塌角砾岩建造中包含来自其相变地层——台缘相清虚洞组的鲕粒灰岩成分的地质依据,综合分析认为,“九门冲组”中的“灰岩夹层或建造”应为外来滑塌滑移迁入。建议将老堡组之上的牛蹄塘组—“九门冲组”—变马冲组合并为渣拉沟组。而杷榔组和乌训组因岩性特征明显易于识别,应予保留。According to‘China Regional Geology-Guizhou’(2017),Jiumenchong formation of Cambrian system is defined as organic limestone carbonaceous clay rock,the Cambrian system in Dahebian area of Tianzhu has been put under Sandu zone of southeast Guizhou layer,from Niutitang formation to Bianmachong formation,even Balang formation to WUxun formation were called Zhalagou formation because the lithology is carbonaceous clay rock and carbonaceous siltstone.The lithology of Jiumenchong formation in Zhaijiao barite exploration were 0 to 8 layer in carbonaceous clay rock limestone formation,the thickness varies from dozens of centimeters to 14.23m,the occurrence height was uncertainly,slump slip deformation structure can be found in limestone formation.Because oolitic limestone was found in platform margin facies which is the phase change stratum in slump breccia formation,it was thought the limestone interlayer of Jiumenchong formation should be outside slump and slip immigration.It’s suggested to combine Niutitang formation,Jiumenchong formation and Bianmachong formation on the Laobao formation to be Zhalagou formation.Balang formation and Wuxun formation are easy to recognize and should be kept for their obvious features.

关 键 词：九门冲组 灰岩建造 滑塌滑移变形 渣拉沟组 天柱大河边 

分 类 号：P619.251[天文地球—矿床学] P534.41[天文地球—地质学]