文档介绍：分类号密级
中国地质大学(北京)
本科毕业论文
题目陕西略阳铧厂沟金矿构造控矿研究
英文题目The ore controlling structure of Huachanggou
gold deposit in Shanxi Province
学生姓名伍陶陶院(系)地球科学与资源学院
专业资源勘查工程(海外班)学号 01308028
指导教师刘家军职称教授
2012 年 5 月
摘要
铧厂沟金矿床位于秦岭造山带南部勉-略-宁三角地区勉-略断裂带以南。本文从矿床的构造情况对铧厂沟金矿进行分析,得出该金矿的发展受韧性剪切带控制,属于韧性剪切带型金矿。我们利用显微镜观察矿区矿物,矿区部分地层有明显的热液沉积特征。在显微镜下可以看到一些热液沉积的特征矿物,如电气石等,早期热液沉积所喷发的黄铁矿团块为金矿床矿源之一。我们在野外观察野外构造现象,分析矿区构造情况;采集野外标本,通过电子探针分析矿物成分,研究金矿的成矿环境。镜下观察矿物、及金赋存空间分析其构造成因。
矿床矿石矿物组成较简单,金属矿物以黄铁矿为主,其次为黄铜矿,有一定量的自然金;脉石矿物以石英、长石、铁碳酸盐为主。矿石构造以浸染状、脉状为主;矿石结构以自形、半自形、它形为主,其次为包含结构、假象结构等。
铧厂沟金矿床产于中一下泥盆统三河口群中,南部的碧口群亦有矿化带的存在。金矿化遍布整个矿区所有的岩性层,明显属于构造控矿,与所处的岩性层没有太大的关系。区域性韧性剪切带控制了矿床的展布,而次级韧脆性剪切带(控矿剪切带)控制了富矿体的分布,后期的脆性构造对矿体有一定的改造、破坏作用,同时也加强了金的再一次富集。强烈的变形构造机制是金矿床形成的主要动力学、运动学机制。韧性剪切带既是导矿构造,也是控矿、容矿构造。
韧性剪切带型金矿床中金的富集不仅在应变最强部位或韧性向脆性转换的部位,还可以在强变形带与弱变形域交接的部位。
关键词:铧厂沟金矿床;构造控矿;韧性剪切带;成矿模式
ABSTRCTE
The Huachanggou gold deposit is located in the south of Qinling Mountains orogenic belt south of Mian-Lue fault zone in Mian—Lue—Ning triangle area . This article analyzed the structure of Huachanggou gold deposit ,the development of the gold deposit,controlled by ductile shear zone, which belongs to the ductile shear zone type gold deposits. We use microscope to observe mining minerals, mining area part of the stratum has the obvious hot water sedimentary characteristics. Under the microscope to see some hydrothermal sedimentary characteristics of minerals, such as tourmaline, early hydrothermal eruption thunderstone as the source of gold deposit. We observed in the wild field structural phenomenon, analysis of structure of mining area; wild specimens collected by electron microprobe analysis, position, study of mineralization of the deposit environment. microscopic observation of minerals, and gold in spatial analysis of its tectonic origin.
Ore position is simple, the metal minerals are dominated by pyrite chalcopyrite, secondly, there is a certain amount of natural gold; gangue minerals quartz, feldspar, with iron ca