滇东北巧家小河铅锌矿床地质特征与成因研究

发布时间：2018-05-29 01:10

本文选题：矿床地质特征 + 地球化学　；参考：《昆明理工大学》2017年硕士论文

【摘要】：小河铅锌矿勘查区地处的滇东北地区,位于扬子板块西缘昆阳裂谷的东缘,其大地构造位置属于扬子准地台(I级)滇东台褶带(II级),是云南省重要的富铅锌成矿地区。该矿床位于鲁甸与巧家两县交界牛栏江边,规模为小型。前人对小河铅锌矿矿床地质、矿床成因方面的研究较少。通过野外地质调查及室内测试分析,对小河铅锌矿矿床的地层、岩性、构造、矿物组合、蚀变等地质特征进行了研究。含矿岩系元素地球化学特征对成矿环境具有指示意义,对矿区赋矿围岩进行了微量及稀土元素地球化学特征研究,并对金属硫化物矿物进行电子探针分析,尝试利用地球化学方法揭示矿区成矿环境。因此,本次研究对鲁甸-巧家地区铅锌矿床的勘查起到积极作用,有助于完善滇东北铅锌矿的成矿理论。论文主要获得以下认识:1、查明了小河铅锌矿矿床地质特征。矿床含矿岩系岩石类型主要有细晶白云岩、硅质细晶白云岩、硅质岩、内碎屑微晶白云岩等。含矿岩系受强烈构造运动改造而广泛出现动力变质并伴随热液蚀变现象,常见自构造角砾岩至碎粉岩等动力变质岩。小河铅锌矿主要矿体按其产出部位及产状可以划分三种矿化类型:顺层接触面型、层间破碎带型和断裂破碎带型。2、含矿岩系地层地球化学特征指示晚震旦世灯影期的沉积环境为还原的海相沉积环境,并提供一部分的成矿物质。3、基于矿床地质特征和矿床元素地球化学特征,认为小河铅锌矿床为中低温热液型矿床。
[Abstract]:The Xiaohe Pb-Zn exploration area is located in the northeast of Yunnan, located in the eastern margin of the Kunyang rift on the western margin of the Yangtze plate. Its tectonic location belongs to the Yangzi quasi platform of grade I) the Taifold belt of eastern Yunnan is of grade II, which is an important lead-zinc-rich metallogenic area in Yunnan Province. The deposit is located in Ludian and Qiaojia counties at the edge of the Niulan River, a small scale. Previous researches on the geology and genesis of Xiaohe lead-zinc deposit are few. Through field geological investigation and laboratory test and analysis, the geological characteristics of Xiaohe lead-zinc ore deposit, such as strata, lithology, structure, mineral assemblage and alteration, are studied. The geochemical characteristics of elements in ore-bearing rock series are instructive to the metallogenic environment. The geochemical characteristics of trace and rare earth elements in the ore-bearing surrounding rock are studied, and the electron probe analysis of metallic sulphide minerals is carried out. This paper attempts to reveal the metallogenic environment by geochemical method. Therefore, this study plays an active role in the exploration of lead and zinc deposits in Ludian-Qiaojia area, and helps to improve the metallogenic theory of lead and zinc deposits in northeast Yunnan. In this paper, the geological characteristics of the Xiaohe lead-zinc deposit have been identified by the following understanding: 1. The rock types of ore-bearing rock series are mainly fine-grained dolomite, siliceous rock, microclastic dolomite and so on. Dynamic metamorphism and hydrothermal alteration are widely seen in the ore-bearing rock series due to strong tectonic movement. Dynamic metamorphic rocks such as from structural breccia to comminuted rocks are common. The main orebodies of Xiaohe lead-zinc ore body can be divided into three types according to their occurrence position and occurrence: the type of bedding contact surface, The stratigraphic geochemical characteristics of ore-bearing rock series indicate that the depositional environment of the late Sinian Dengying period is a reduced marine sedimentary environment. Based on the geological characteristics of the deposit and the geochemical characteristics of the deposit elements, it is considered that the Xiaohe lead-zinc deposit is a middle-low temperature hydrothermal deposit.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.4

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