胶东三山岛金矿断裂矿化蚀变分带的岩石矿物学依据

发布时间：2018-03-15 22:10

本文选题：三山岛金矿　切入点：断裂矿化蚀变带　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】：胶东地区是我国最大的金矿集中区,其矿床类型为岩浆期后中温热液的构造—蚀变岩金矿。在三山岛金矿带,近年又有北部海域金矿(约450吨)和西岭金矿(约350吨)两个超大型金矿的发现,其金矿的赋存与断裂蚀变岩带密切相关。本人选择《胶东三山岛金矿断裂矿化蚀变分带的岩石矿物学依据》为硕士论文题目,对三山岛金矿构造—蚀变—矿化规律进行研究,对于外围找矿具有一定意义。本研究生论文期间参加了多个研究项目:国家科技支撑计划项目“胶西北金矿深部找矿地球化学方法集成与示范”,山东黄金集团科研项目“玲珑金矿田东部断裂蚀变成矿体系三维研究与深部预测”和“玲珑矿田48、50号脉综合地质研究与深部成矿预测”等科研课题。在胶东开展了三次野外工作研究,并在室内系统整理和鉴定分析,获得了丰富的实际资料,尤其是采取了系统的三山岛深部钻孔的岩心资料,通过岩石学、矿物学定量观测的角度,深化胶东断裂矿化蚀变分带性研究工作,按时完成了硕士学位论文,取得的主要新认识和新进展如下:1、完成了三山岛金矿-375m中段与多钻孔的断裂构造蚀变岩分带编图。三山岛构造蚀变分带为:黄铁绢英岩带—黄铁绢英岩化碎裂岩带—(黄铁)绢英岩化花岗质碎裂岩带—强钾化花岗质蚀变岩带—弱钾化二长花岗岩带,这一分带情况在中段和钻孔剖面上能够吻合。通过中段结合钻孔资料分析,反应了矿区构造蚀变矿化的空间分布。2、研究了三山岛金矿区的断裂矿化蚀变带的岩石学矿物学标志。通过开展三山岛金矿典型钻孔资料的薄片鉴定研究,得知,从未蚀变花岗岩带到靠近断裂面,岩石类型由中细粒二长花岗岩、变辉长岩等逐渐变化为花岗质碎裂岩、碎裂岩、糜棱岩、黄铁绢英岩等。3、利用岩石化学分析资料,建立了断裂蚀变分带矿物交代剖面。结合地球化学分析,矿化蚀变带中矿物含量,由外向内,正长石含量先增后减,钠长石含量递减,钙长石含量先稳后减,石英含量先稳后增,说明蚀变类型主要为钾长石化、硅化、黄铁绢英岩化,也进一步证明了蚀变分带的准确性,深化了成岩成矿过程。
[Abstract]:Jiaodong area is the largest gold deposit concentration area in China. Its deposit type is tectonic-altered rock gold deposit of post-magmatic medium temperature hydrothermal solution. In recent years, two super-large gold deposits have been discovered in the northern sea area (about 450 tons) and Xiling gold deposits (about 350 tons). The occurrence of the gold deposit is closely related to the fault-altered rock belt. In this paper, the author chooses "the basis of rock mineralogy of the fault mineralization alteration zone" as the master thesis, and studies the tectonic-alteration and mineralization law of the Sanshandao gold deposit. It has certain significance for peripheral prospecting. During the period of this thesis, I participated in many research projects: the National Science and Technology support Program project "Integration and demonstration of geochemical methods for deep prospecting in Jiao Northwest Gold Mine", Shandong Gold Group Section. The research projects of "Three-dimensional study and deep prediction of fracture erosion system in eastern Linglong gold ore field" and "comprehensive geological study and deep metallogenic prediction of 48yue 50 vein in Linglong Orefield" have been carried out three times in Jiaodong. And through systematical analysis and analysis in the laboratory, abundant practical data are obtained, especially the core data of the deep borehole in Sanshan Island, and the angle of quantitative observation through petrology and mineralogy. To deepen the study of mineralization alteration zonation of Jiaodong fault and finish the master's thesis on time, The main new knowledge and new progress obtained are as follows: 1, completed the compilation of fracture structural alteration rock zoning in the middle segment -375m of Sanshandao gold deposit and multiple boreholes. The structural alteration zoning of Sanshandao is: Huangtaishinite belt-Huangtiesinite lithoclastic clastic rock. Zone-(Huang Tie) sericite granitic cataclastic rock belt-strong potash granitic altered rock belt-weak K _ 2O _ 2 granite belt, This subzone can be matched in the middle section and the borehole section. Through the middle section combined with the borehole data analysis, Reflecting the spatial distribution of structural alteration and mineralization in the mining area, the petrological mineralogical markers of the fault mineralization alteration zone in Sanshandao gold deposit are studied. Through the research on the thin section identification of typical borehole data of Sanshandao gold deposit, it is found that, Never altered granite was brought to near the fault surface, and the rock types changed gradually from medium-fine-grained monzonitic granite and metamorphic gabbro to granitic cataclastic rock, cataclastic rock, mylonite, yellow sericite, etc., and the petrochemical analysis data were used. The mineral metasomatism profile of the faulted altered zone is established. According to the geochemical analysis, the mineral content in the mineralized alteration zone increases first and then decreases from outside to inside, while the albite content decreases, and the calcium feldspar content first stabilizes and then decreases. The quartz content first stabilizes and then increases, which indicates that the alteration types are mainly potassium feldspar, silicification and yellow sericite lithology, which further proves the accuracy of the altered zones and deepens the diagenesis and metallogenic process.
【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】：P618.51

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