凌源市毛头坝水泥用石灰岩矿地质特征及成因类型探讨

研究区位于中朝准地台（Ⅰ）、燕山台褶带（Ⅰ4）、辽西台陷（Ⅰ14）、朝阳穹褶断束（Ⅰ1-24）的四官营子—沟门子盆地内。发现水泥用石灰岩矿层赋存于古生界寒武系中统张夏组一段、七段地层中,而且部分层位达到熔剂灰岩要求。为探明毛头坝水泥用石灰岩矿地质特征及成因类型，通过地质勘查及以往区域资料综合研究，区域地层呈倒转背斜构造形态，矿层严格受地层层位控制。矿石呈灰—深灰色，自然类型为灰色中厚—巨厚层鲕状灰岩矿石和灰色中厚层泥晶灰岩矿石两种类型。共圈定具有工业意义的Ⅰ级品矿层5条、Ⅱ级品矿层3条。矿床成因类型为海相沉积矿床。寒武系中统张夏组一段、七段地层的鲕状灰岩为找矿标志。本次水泥用石灰岩矿勘查在辽西地区尚属首次，填补了辽西地区在寒武系中统张夏组地层中寻找水泥用石灰岩矿层的空白。

Discussion on Geological Characteristics and Genetic Types of Cement Limestone Mine in Maotouba,Lingyuan City

The study area is located in the Sino Korean paraplatform (Ⅰ),Yanshan fold belt (Ⅰ4),West Liaoning depression(Ⅰ14),chaoyang dome fold break beam (Ⅰ1-24) within the basin of siguanyingzi～goumenzi.It is found that cement limestone deposits occur in the strata of the first and seventh member of the middle Cambrian zhangxia formation of the Paleozoic.And some layers meet the requirements of fluxing limestone.In order to find out the geological features and genetic types of the cement limestone mine of maotouba,through geological exploration and comprehensive study of previous regional data,the regional strata presents inverted anticline structure,and the ore layer is strictly controled by the stratum.The ore is gray dark gray,the natural type is gray medium thick~ thicker layer oolitic limestone ore and gray medium thick layer micritic limestone ore.Identify areas of industrial significance of fiveⅠ grade seams,threeⅡ grade seams.The genetic type of ore deposit is Marine sedimentary deposit.The oolitic limestone in the first and seventh member strata of the middle Cambrian zhangxia formation is a prospecting indicator.This is the first time for cement limestone explorationin western area of Liaoning province,It fills up the blank of looking for cement limestone in the middie Cambrian zhangxia formation in western area of Liaoning province.