太行山南段桃园铜矿成因矿物学研究

发布时间：2018-02-10 22:02

本文关键词： 桃园铜矿标型特征成因矿物学矿床成因　出处：《石家庄经济学院》2015年硕士论文　论文类型：学位论文

【摘要】：桃园铜矿床位于河北内丘县与临城县交界处,大地构造位置属中朝准地台的山西断隆东部,太行拱断束赞皇穹断束西侧。区内主要出露地层为古元古界甘陶河群。本次研究在掌握矿床地质特征基础上,运用成因矿物学理论,对本矿区不同成矿阶段的黄铁矿、黄铜矿、闪锌矿的标型组合、形态标型特征、成分标型特征以及物性标型特征进行分析,确定本矿床成矿物理化学条件、成矿物质来源及矿床成因。通过野外地质勘探和室内测试研究,主要取得的认识有:黄铜矿、黄铁矿、闪锌矿为本矿区主要的金属矿物,根据测试分析,表明黄铁矿、黄铜矿和闪锌矿中稀土元素分布不均,表现为Eu和Ce亏损。主量元素电子探针结果表明,黄铜矿、黄铁矿、闪锌矿中硫皆亏损,说明其形成于硫逸度较低的环境中,由于硫逸度低,导致As元素进入黄铁矿(黄铜矿、闪锌矿)晶格,产生代换。根据矿化蚀变期次及矿物共生组合,可将黄铁矿分为三个世代,黄铁矿的微量元素的分析结果显示本矿区黄铁矿为岩浆热液成因。黄铁矿硫同位素测试结果表明桃园铜矿硫源的深源性,说明硫源主要来源于地幔。根据闪锌矿主量元素电子探针结果计算,桃园铜矿中闪锌矿中Fe S含量在15.9%~17.50%。说明早期闪锌矿的岩浆热液为高-中温。由闪锌矿微量元素计算结果 In/Ga值小于1,说明晚期闪锌矿的岩浆热液为中-低温。综上桃园铜矿床的成因类型为火山-次火山热液型矿床。
[Abstract]:Taoyuan copper deposit is located at the junction of Neiqiu County and Lincheng County, Hebei Province. The west side of the Zanhuang Dome of Taihang arch fault bundles. The main outcrop in the area is the Paleoproterozoic Gan Gan River Group. Based on the geological characteristics of the deposits, this study applied genetic mineralogical theory to the pyrite and chalcopyrite in different metallogenic stages of the mine. The typomorphic assemblage, morphological typomorphic characteristics, composition typomorphic characteristics and physical property typomorphic characteristics of sphalerite are analyzed to determine the ore-forming physicochemical conditions, ore-forming source and ore genesis of the deposit. The main knowledge obtained is that chalcopyrite, pyrite and sphalerite are the main metallic minerals in the mine. According to the test and analysis, it is shown that the distribution of rare earth elements in pyrite, chalcopyrite and sphalerite is uneven. The results of electron probe showed that the sulfur in chalcopyrite, pyrite and sphalerite were all depleted, which indicated that they were formed in the environment with low sulfur fugacity, which resulted in the entry of as into pyrite (chalcopyrite, chalcopyrite, chalcopyrite, chalcopyrite) due to the low sulfur fugacity. Sphalerite) lattice, resulting in substitution. According to the mineralization alteration stage and mineral symbiotic assemblage, pyrite can be divided into three generations, The analysis of trace elements in pyrite shows that the pyrite is magmatic hydrothermal origin, and the sulfur isotope test of pyrite indicates that the sulfur source of Taoyuan copper deposit is deep source. It shows that the sulfur source is mainly derived from the mantle. Based on the electron probe results of the major elements of sphalerite, The content of Fe S in sphalerite in Taoyuan Copper Mine is 15.9 ~ 17.50. It shows that the magmatic hydrothermal fluid of the early sphalerite is high to medium temperature. The In/Ga value of trace elements calculated from the sphalerite is less than 1, which indicates that the magmatic hydrothermal fluid of the late sphalerite is medium-low temperature. The genetic type of the upper Taoyuan copper deposit is volcanic-subvolcanic hydrothermal deposit.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41

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