胶西北招平断裂带地质特征及控矿规律研究

发布时间：2018-05-11 01:20

本文选题：招平断裂 + 金矿　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：招平断裂带是胶西北金矿集区的三大主断裂之一,而且胶西北地区的三大断裂控制了胶东80%以上的金矿储量,这么大规模的金矿集中在胶西北地区必定有其特殊的区域地质背景和特殊的控矿规律。本文选取胶西北地区招平断裂带上的四个金矿床——玲珑金矿、大尹格庄金矿、夏甸金矿和谢家沟金矿,首先对其地质特征—矿体特征、矿石类型、组构特征、矿物类型、金的赋存状态和围岩蚀变六个方面进行归纳总结;对四个金矿床的年代学、主量元素、微量元素和稀土元素地球化学数据进行了分析。年代学研究表明招平断裂带金矿主要成矿年龄介于130~110Ma之间,金矿受同一地壳演化控制,具有相同的大地构造背景。主量元素特征显示招平断裂带的岩石样品均显示出高钾、贫钛及磷、过铝质、钙碱性的特征;微量元素特征显示成矿物质来源具有多样性,可能为壳幔混合来源;稀土元素特征显示所有样品均表现出轻稀土富集、重稀土亏损的平缓“右倾”曲线分配型式。根据地球化学特征对岩石成因及形成环境探讨认为,燕山早期的成岩作用与晚期的成矿作用关系密切,具有相同的岩浆来源,可能为同一岩浆活动的先后产物,招平断裂带金矿床花岗岩及蚀变岩可能形成于挤压造山带构造背景下。本文从构造控矿和脉岩控矿两个方面对招平断裂带的控矿规律进行了研究,招平断裂带区域上主要受到郯庐断裂带中生代强烈构造岩浆活动的影响,其断裂构造为成矿提供了容矿空间;招平断裂带部分矿体与脉岩在空间上的相依性和物质来源的同源性,表明招平招平断裂上的金矿床与脉岩有着密切的联系。所以,脉岩可以作为招平断裂带的找矿标志。
[Abstract]:The Zhaoping fault zone is one of the three major faults in the gold accumulation area of northwestern Jiao, and the three faults in the northwestern area control over 80% of the gold reserves in Jiaodong. There must be a special regional geological background and a special ore-controlling law for such a large gold deposit concentrated in the northwestern Jiao area. In this paper, four gold deposits, Linglong gold deposit, Dayingezhuang gold deposit, Xiadian gold deposit and Xie Jiagou gold deposit in Zhaoping fault zone of northwestern Jiao are selected. Firstly, the geological characteristics, ore types, fabric characteristics and mineral types of the gold deposits are analyzed. The occurrence state of gold and the alteration of surrounding rock are summarized and the geochemistry data of the four gold deposits are analyzed in terms of geochronology, principal elements, trace elements and rare earth elements. The chronological study shows that the main metallogenic age of the Zhaoping fault zone is between 130~110Ma and the gold deposit is controlled by the same crustal evolution and has the same tectonic background. The characteristics of main elements show that the rock samples of Zhaoping fault zone all show the characteristics of high potassium, poor titanium and phosphorus, peraluminous, calc-alkaline, trace element characteristics show that the source of ore-forming material is diverse, which may be the mixed source of crust and mantle. The characteristics of rare earth elements show that all samples show light rare earth enrichment, and the distribution pattern of "right dip" curve of heavy rare earth deficiency is gentle. According to the geochemical characteristics of the petrogenesis and formation environment, it is considered that the early Yanshanian diagenesis is closely related to the late mineralization and has the same magma source, which may be the product of the same magmatic activity. The granites and altered rocks of the Zhaoping fault zone may have been formed in the tectonic setting of the compressional orogenic belt. In this paper, the ore-controlling law of Zhaoping fault zone is studied from two aspects of tectonic ore control and vein rock ore-control. The area of Zhaoping fault zone is mainly affected by the Mesozoic tectonic magma activity in the Tanlu fault zone. The fault structure provides ore-bearing space for mineralization, the spatial dependence of some orebodies and dike rocks and the homology of material sources in Zhaoping fault zone indicate that the gold deposits on Zhaoping fault are closely related to dike rocks. Therefore, dike rock can be used as a prospecting marker of Zhaoping fault zone.
【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

【参考文献】