新疆青河库布苏金矿元素质量迁移规律研究及成矿环境分析

发布时间：2018-07-02 22:47

本文选题：新疆库布苏金矿 + 元素质量迁移　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：库布苏金矿大地构造位置处于西伯利亚板块与哈萨克斯坦-准噶尔板块接壤部位,中亚造山带中段,东准噶尔金成矿带。该区经历了晚古生代重要的碰撞造山运动,发生了强烈的后碰撞构造变形-岩浆活动-成矿作用。本文针对库布苏金矿床,以矿床地质、岩石地球化学特征为基础,主要依据勘查地球化学理论、元素质量迁移理论,结合成矿流体来源分析,对库布苏金矿元素质量迁移规律、特征勘查指示元素、成矿环境、找矿方向进行详细研究,本论文主要获得以下认识:1、库布苏金矿北矿带赋矿闪长玢岩岩石化学特征为富钠、低钾、高铁镁、钙碱性、准铝质到过铝质,蚀变闪长玢岩中REE在热液蚀变过程整体都发生了富集,Eu负异常更加显著,说明热液流体本身具有较强的Eu负异常特征,库布苏金矿床成矿流体成矿环境应为较高温度和还原环境。2、库布苏金矿质量迁移计算结果表明,库布苏金矿赋矿闪长玢岩脉、石英钠长斑岩脉及围岩的元素组分均发生了不同程度的带入和带出,发生明显带入有成矿伴生元素Au、As、Bi、Ag、Sb,常量元素K2O、Si O2;发生明显带出的有微量元素Ba、Sr、Cu,常量元素Mg O、Na2O、Fe2O3、Ca O。3、在三条剖面中,元素质量迁移的空间变化各异即元素迁移程度和迁移范围均有不同,受岩浆热液作用带入的成矿及伴生元素Au、As迁移程度大,迁移范围较大,Sb、Bi迁移程度较小,迁移范围也很大;Na2O、Mg O明显带出,迁移范围广。说明库布苏金矿是受到了岩浆热液和变质热液的共同作用而成矿。与金成矿有密切关系的特征成矿指示元素有,带入的为As、W、Sb、Bi,带出的为Mg、Na。受热液成矿流体作用,Au及其伴生元素的带入范围和带入程度,自西(165线)向东(105线)呈增大趋势,反映出从165线开始,沿1号矿脉向东金的带入程度增强,成矿环境更有利于金的沉淀。表明库布苏金矿北矿带沿着1号脉从105勘探线向东及深部有较大成矿前景。4、进一步认识库布苏金矿成矿环境,成矿流体性质浅成、中高温、低盐度、富CO2的还原性流体,主成矿阶段流体温度转变为中温,使金发生沉淀的流体应以岩浆晚期热液为主。成矿流体以岩浆水为主,也有大气水混入。
[Abstract]:The tectonic position of Kubusu gold deposit is located at the border of Siberian plate and Kazaka-Junggar plate, the middle section of Central Asian orogenic belt and the East Junggar gold metallogenic belt. The area experienced an important late Paleozoic collisional orogenic movement with strong post-collision tectonic deformation-magmatic activity and mineralization. Based on the geological and petrogeochemical characteristics of the Kubusu gold deposit, based on the theory of exploration geochemistry, the theory of mass migration of elements, and the analysis of the source of ore-forming fluid, the law of mass migration of elements in the Kubusu gold deposit is studied in this paper. The characteristics of prospecting indicator elements, metallogenic environment and prospecting direction are studied in detail. In this paper, we have obtained the following understanding: 1. The ore-bearing diorite porphyrite in the northern Kubusu gold deposit is characterized by rich sodium, low potassium, high ferric magnesium, calc-alkaline, rich in sodium, low potassium, high iron and magnesium, calc-alkaline. The REE in the altered diorite porphyrite is enriched with negative EU anomaly in the whole hydrothermal alteration process, which indicates that the hydrothermal fluid itself has a strong EU negative anomaly, and the REE in the altered diorite porphyrite is characterized by the negative EU anomaly in the whole hydrothermal alteration process, which indicates that the hydrothermal fluid itself has a strong EU negative anomaly. The ore-forming fluid metallogenic environment of Kubusu gold deposit should be higher temperature and reductive environment .2.The result of mass migration calculation of Kubusu gold deposit shows that the ore-bearing diorite porphyrite vein is located in Kubusu gold deposit. The element components of quartz sodium porphyry vein and surrounding rock have been brought in and taken out to different degrees, and have obviously brought into the ore-forming associated element, Au-As-BibiaAg-Sb, major element K _ 2O-Si _ 2O _ 2, and the obvious trace elements, such as the trace element Baanzru Cuand, the major element mg _ OO _ 2O _ (Na _ 2O) Fe _ 2O _ 3Ca _ 2O _ 3, have occurred in three sections. The spatial variation of mass migration of elements is different, that is, the degree and range of element migration are different. The degree of mineralization and associated element Au-As migration brought by magmatic hydrothermal process is large, and the migration range is larger than that of SbPBI migration. The migration range of Na _ 2O _ 2O _ 2 mg _ O is also very large and the migration range is wide. It shows that the Kubusu gold deposit was formed by the interaction of magmatic hydrothermal fluid and metamorphic hydrothermal solution. The characteristic ore-forming indicator elements which are closely related to gold mineralization are as _ (WN) _ (SB) _ (Bi) and mg ~ (2 +) Na _ (Na). From the west (165) to the east (105), the range and extent of the introduction of au and its associated elements into the ore-forming fluid of the hydrothermal solution show an increasing trend, which shows that the extent of the introduction of au and its associated elements to Dongjin along the No. 1 ore vein is increased from 165 to 105. The metallogenic environment is more favorable for gold precipitation. The results show that the north ore belt of Kubusu gold deposit has a great metallogenic prospect along the first vein from No. 105 to east and deep. The ore-forming environment, ore-forming fluid, ore-forming fluid with shallow, medium high temperature, low salinity and rich CO _ 2 in Kubusu gold deposit are further recognized, and the ore-forming fluid is rich in CO _ 2. In the main metallogenic stage, the fluid temperature changes to medium temperature, and the fluid that precipitates gold should be mainly late magmatic hydrothermal solution. The ore-forming fluid is dominated by magmatic water and mixed with atmospheric water.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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