内蒙古浩布高铅锌铜矿床地质特征研究与成矿预测

发布时间：2018-03-21 18:13

  本文选题：浩布高矿床　切入点：矽卡岩型矿床　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：浩布高铅锌铜矿床位于内蒙赤峰的北部,得天独厚的地质构造背景使得本区拥有优异的成矿条件。通过对浩布高矿区的区域地质和矿床地质特征研究,结合岩石、矿床地球化学特征进行分析总结,本文主要取得了以下认识:(1)梳理了浩布高铅锌铜矿的控矿因素,包括控矿构造、赋矿地层和空间以及矿石特征。得出浩布高矿区的主要控矿构造是广泛分布在矿区的一系列NE向断裂构造,为成矿期构造;矿体主要赋存于中酸性侵入岩与大石寨组大理岩的接触形成的矽卡岩带上及其附近;常见的矿石结构有自形、半自形结晶结构、固溶体分离结构和交代结构等;构造以脉状、细脉状填充构造为主,浸染状构造和条带状构造也比较常见。(2)通过对浩布高采集样品的硫同位素测试数据分析,分析样品矿物硫化物的δ~(34)S值表现出塔式分布的特点,表明S同位素在成矿作用过程中基本处于一种分馏平衡的状态;样品中δ~(34)S值最低位-5‰,最高为0.6‰;平均值为-1.48‰,表现出幔源硫的特征,且其来源单一,主要来自地幔深部的岩浆。(3)浩布高铅锌铜矿床铅同位素组成特征的μ值和ω值较低,这表明矿石铅可能来源于富钍亏铀的源区,总体上表现出上地幔物质来源特征且在岩浆侵入时混染了部分地壳的物质。通过对比分析代表成岩物质来源的钾长石Pb同位素组成特征发现,浩布高矿床矿区成岩物质和成矿物质的来源可能相同,他们均来自造山带和地幔物质。(4)H-O同位素分析表明,浩布高矿床矿区的成矿热液有岩浆气水热液和大气降水两个来源,矿区成矿热液在前期主要为岩浆气水热液,到后期大气降水则逐渐转变成为成矿热液的主要来源。(5)成矿规律研究表明,浩布高矿床的形成受到地层、构造和岩浆岩等多方面因素的综合制约。表现为有利的地层下受到含矿的岩浆气水热液通过渗透交代作用在有利的部位(大理岩的层间断裂或轴部的虚脱部位)聚集成矿。浩布高矿床的找矿预测模式有助于矿区找矿工作的部署,在北东向构造带内寻找多金属矿产前景较好。
[Abstract]:The Haobugao lead-zinc copper deposit is located in the northern part of Chifeng, Inner Mongolia. The unique geological tectonic background makes the area have excellent metallogenic conditions. The geochemical characteristics of the deposit are analyzed and summarized. In this paper, the following understanding is obtained: 1) the ore-controlling factors, including the ore-controlling structure, of the Haobugao lead-zinc copper deposit are combed. It is concluded that the main ore-controlling structures in Haobugao mining area are a series of NE-trending fault structures widely distributed in the ore area, which are metallogenic structures. The ore bodies mainly occur in the skarn belt formed by the contact between the intermediate-acid intrusive rocks and the marble of Dashizhai formation, the common ore structures are self-shaped, semi-automorphic, solid-solution and metasomorphic, etc. Based on the analysis of the sulfur isotopic data of the samples collected from Haobugao, it is found that the 未 ~ (34) S value of the mineral sulfides of the samples shows the characteristics of tower distribution. The results show that the S isotope is basically in a fractionation equilibrium state during mineralization, the lowest value of 未 ~ (34) S in the sample is -5 鈥，

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