赣东北朱溪钨铜矿区中生代花岗岩与成矿研究

发布时间：2018-03-27 11:45

本文选题：朱溪　切入点：钨矿　出处：《中国地质大学(北京)》2017年硕士论文

【摘要】：朱溪钨铜床是近年来发现的一个世界级超大型矿床,其形成机制引起了国内外众多学者的兴趣。近年来,随着研究工作的深入,在矿床地质特征、区域岩浆岩特征等方面都取得了很大进展。由于朱溪钨铜矿床成矿作用的复杂性,该矿床的研究仍存在诸多问题。如朱溪矿区岩浆岩的岩石学特征、朱溪矿区岩浆岩与成矿的关系、朱溪矿区及其周围地区岩浆岩的期次划分、朱溪矿区与成矿相关的岩浆岩与华南主要钨矿相比的特殊性。基于这一背景,本文从岩浆岩与成矿的角度出发。研究矿区各类岩浆岩的岩相学特征、岩石地球化学特征,结合同位素年代学和同位素地球化学,探讨了朱溪矿区岩浆岩岩石学特征及其与成矿的关系。从岩浆岩的角度出发,回答“朱溪为何可以形成如此大规模的钨矿?”这一核心问题。本文取得的主要研究成果和认识如下:(1)朱溪矿区与成矿密切相关的岩石类型主要为绢云母化黑云母花岗岩、白云母花岗岩、白云母花岗斑岩、二云母花岗岩等。其中,绢云母化黑云母花岗岩主要与矽卡岩型矿化有关,二云母花岗岩主要与云英岩型矿化和绢云岩型矿化有关。(2)朱溪矿区的黑云母花岗岩、白云母花岗岩、白云母花岗斑岩、二云母花岗岩是同源岩浆岩,属于分异程度较高的,高Si、过铝质高钾钙碱性系列的S型花岗岩。(3)朱溪矿区及其外围地区燕山期岩浆活动主要分为三期:第一期岩浆活动发生在160Ma左右,主要与Cu、W、Mo矿化相关;第二期活动发生在150Ma左右,主要与W矿化相关;第三期发生在130Ma左右,尚未发现有关矿化。(4)朱溪矿区及其外围地区燕山期岩浆活动构造背景为洋陆汇聚导致的陆内俯冲。大规模岩浆活动开始于160Ma左右,εHf(t)值为-5.7~-9.9。到了150Ma左右,相比有了一定的幔源物质加入,εHf(t)值为-4.9~-8.9。130Ma左右,有了更多的幔源物质加入,其εHf(t)值为-5~1.5。(5)结合矿床学和岩石地球化学,初步总结朱溪矿区岩浆岩的独特性。
[Abstract]:Zhuxi tungsten copper deposit is a world-class superlarge deposit discovered in recent years. Its formation mechanism has aroused the interest of many scholars at home and abroad. Great progress has been made in the characteristics of regional magmatic rocks. Due to the complexity of mineralization of the Zhuxi W-Cu deposit, there are still many problems in the study of the deposit, such as the petrological characteristics of the magmatic rocks in the Zhuxi mining area. The relationship between magmatic rocks and mineralization in Zhuxi mining area, the division of magmatic rocks in and around Zhuxi mining area, and the particularity of magmatic rocks related to mineralization in Zhuxi mining area compared with the main tungsten deposits in South China. From the point of view of magmatic rock and metallogenesis, this paper studies the petrographic and geochemical characteristics of various magmatic rocks in the mining area, combined with isotopic chronology and isotope geochemistry. The petrological characteristics of magmatic rocks in Zhuxi mining area and their relationship with mineralization are discussed. From the point of view of magmatic rocks, the answer is given, "Why did Zhuxi form such a large scale tungsten deposit?" "this core problem. The main research results and understandings obtained in this paper are as follows: 1) the rock types closely related to mineralization in Zhuxi mining area are sericite biotite granite, Muscovite granite, Muscovite granitic porphyry, and Muscovite granitic porphyry. Among them, sericite biotite granites are mainly related to skarn type mineralization, and dimicite granites are mainly related to quartz type mineralization and sericite type mineralization. Muscovite granitic porphyry, dimica granite are homologous magmatic rocks, which belong to the higher degree of differentiation. The Yanshanian magmatism in the Zhuxi mining area and its periphery is divided into three stages: the first stage of magmatic activity occurs around 160Ma, which is mainly related to the mineralization of Cu-wo Mo; The second stage occurred in 150Ma, mainly related to W mineralization, and the third occurred in 130Ma. The tectonic setting of Yanshanian magmatic activity in the Zhuxi mining area and its periphery is the intra-continental subduction caused by oceanic continental convergence. The large-scale magmatic activity began around 160Ma, and the 蔚 Hfft) value was -5.7- 9.9. Compared with a certain mantle-derived material, the 蔚 Hft) value is -4.9 ~ 8.9.130 Ma, and more mantle source material is added, and its 蔚 Hft1. 5) value is -51.5.55) in combination with mineralogy and petrogeochemistry, the uniqueness of the magmatic rocks in the Zhuxi mining area is preliminarily summarized.
【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】：2017
【分类号】：P612;P588.121

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