张家口南部碳酸盐岩地层对铅锌银多金属矿床的成矿制约

发布时间：2018-05-15 08:58

本文选题：碳酸盐岩地层 + 铅锌银多金属矿床　；参考：《石家庄经济学院》2015年硕士论文

【摘要】：张家口地区大地构造位置处于华北地台北缘,是河北省重要的铅锌银多金属矿产富集区。以往工作主要集中在张家口北部,已发现的蔡家营、青羊沟等大、中型铅锌矿均产出于北部内蒙地轴中。张家口南部中—上元古代碳酸盐岩盖层和燕山期中酸性岩体分布广泛,构造运动强烈,具备形成层控碳酸盐岩型和矽卡岩型铅锌银多金属矿床的优越地质条件。在碳酸盐岩地层对铅锌银多金属矿床的成矿制约问题上,由于研究程度较低,找矿工作长期以来未取得突破性进展。为了清楚地了解矿床地质特征,准确地划分矿床类型,系统地掌握成矿规律,有效地提供找矿方向,此次研究根据张家口地区地质成矿条件和收集的相关资料,将张家口南部与碳酸盐岩地层有关的铅锌银多金属矿床分布区作为研究区,涉及宣化区、赤城县、怀来县、涿鹿县等区域。研究区大地构造位置处于华北地台北缘中段燕山裂陷带内。本次工作建立在基础地质研究的基础上,了解研究区岩浆构造特征及演化规律、地层分布及其特征;以赋存在雾迷山组白云岩地层中的赤城梁家沟矿床和赋存在雾迷山组白云岩与燕山期中酸性岩体接触带的涿鹿孟家窑矿床为例进行研究,对所采集岩(矿)石样品进行室内镜下光、薄片鉴定,以及微量元素、稀土元素地球化学分析测试,初步厘定梁家沟矿床为MVT型铅锌银多金属矿床,孟家窑矿床为矽卡岩型铅锌银多金属矿床。同时,根据研究区地质地貌特点,在碳酸盐岩出露区选取3条路线地球化学剖面,以分析碳酸盐岩地层沉积环境和地层含矿性,厘定铅锌银多金属矿床与中—上元古代碳酸盐岩地层之间的成因联系及其对成矿的控制作用。研究认为区内高于庄组、雾迷山组白云岩发育于潮上带和潮间带环境,与铅锌银多金属矿床的形成关系密切,特别是角砾云岩,其溶孔和裂隙发育,有利于成矿热液的沉淀。本次工作为今后张家口南部地区与碳酸盐岩地层相关的铅锌银多金属矿床找矿预测提供理论依据。
[Abstract]:The tectonic location of Zhangjiakou area is located on the margin of North China platform, and is an important rich area of lead, zinc and silver polymetallic minerals in Hebei Province. The previous work was mainly concentrated in the northern part of Zhangjiakou. The large and medium-sized lead-zinc deposits such as Cai Jiaying and Qingyanggou have been found in the northern Inner Mongolia axis. The middle and upper Proterozoic carbonate caprocks and Yanshanian acid rock bodies in the south of Zhangjiakou are widely distributed and have strong tectonic movement, which have favorable geological conditions for the carbonate type and skarn type lead, zinc and silver polymetallic deposits controlled by cambium. Because of the low degree of research, no breakthrough has been made in prospecting for a long time in the problem of carbonate strata restricting the mineralization of lead-zinc-silver polymetallic deposits. In order to clearly understand the geological characteristics of the deposit, divide the deposit types accurately, master the metallogenic rules systematically, and provide the prospecting direction effectively, this study is based on the geological metallogenic conditions and the relevant data collected in Zhangjiakou area. The study area of lead-zinc-silver polymetallic deposits related to carbonate strata in the south of Zhangjiakou is concerned with Xuanhua area, Chicheng County, Huailai County, Zhuolu County and so on. The tectonic position of the study area is located in the Yanshanian rift belt in the middle of the North China platform. This work is based on the basic geological research to understand the characteristics of magmatic structure and evolution, stratigraphic distribution and characteristics in the study area. Taking the Chicheng Liangjiagou deposit in the dolomite strata of the Wumishan formation and the Zhuolu Mengjiayao deposit in the contact zone between the dolomite of the Wumishan formation and the Yanshanian intermediate acid rock mass as examples, The samples of rock (ore) stone collected were identified by indoor microscope, thin slice identification and geochemical analysis of trace elements and rare earth elements. It was preliminarily determined that the Liangjiagou deposit is a MVT type lead-zinc-silver polymetallic deposit. The Mengjiayao deposit is a skarn-type lead-zinc-silver polymetallic deposit. At the same time, according to the geological and geomorphological characteristics of the study area, three geochemical sections are selected in the carbonate outburst area to analyze the sedimentary environment of carbonate strata and the ore-bearing properties of the carbonate strata. The genetic relationship between the lead-zinc-silver polymetallic deposits and the Meso-Upper Proterozoic carbonate strata and their control over the mineralization are determined. It is considered that dolomite of Wumishan formation is developed in the upper tidal zone and intertidal zone environment, which is closely related to the formation of lead, zinc and silver polymetallic deposits, especially the breccia dolomite, whose dissolution pores and fractures develop, which is conducive to the deposit of ore-forming hydrothermal solution. This work provides a theoretical basis for prospecting and prediction of lead-zinc-silver polymetallic deposits related to carbonate strata in the southern area of Zhangjiakou.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2

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