甘肃北山公婆泉斑岩型铜矿地质地球化学特征及成因分析

发布时间：2018-06-18 12:50

本文选题：甘肃北山 + 斑岩型铜矿床　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：公婆泉铜矿位于甘肃—蒙古北山铜矿成矿带。前人对公婆泉铜矿的研究已经取得了一批宝贵的成果和资料,但对该矿床缺乏较系统地质和地球化学研究。本文以较多野外工作为基础,并与室内紧密结合,研究该矿床的地质地化特征及矿床成因,取得的主要认识如下：1、矿区斑岩类型为花岗闪长斑岩和英安斑岩。两类斑岩为高钾钙碱性系列岩石,微量元素蛛网图和球粒陨石标准化分布形式基本一致,具有同源性。斑岩富集大离子亲石元素(LILE),如Ba、Rb、Pb等元素均呈明显的正异常,相对亏损Nb、Ta等高场强元素(HFSE)。2、公婆泉铜矿成矿流体包裹体表明：铜矿的含矿石英脉中广泛发育4类流体包裹体：纯气相包裹体(Ⅰ型),纯液相包裹体(Ⅱ型),原生富液相气液两相包裹体(Ⅲa型)以及次生富液相气液两相包裹体(Ⅲb型)。成矿温度范围250℃-500℃之间,盐度峰值在2.0%-6.0%,密度范围0.75～1.0g/cm3,表明成矿流体具有中高温、低盐度以及低密度特征。激光拉曼探针分析表明,液相成分以H2O为主；气态成分以H2、N2、CH4为主。3、氢、氧、硫同位素分析表明,幔壳混合岩浆在上升、侵位时带来了大量的成矿物质Cu、S。岩浆分异出成矿流体沿着矿区构造断裂系统上升运移,由于压力突然释放造成含矿流体发生减压沸腾导致相态分离,使流体中金属卸载,减压沸腾可能是导致流体中金属卸载形成矿床的主要原因。
[Abstract]:The Gong Po spring copper deposit is located in the Gansu Mongolia Beishan copper mine metallogenic belt. The predecessors have obtained a lot of valuable achievements and data on the study of the Gong Po spring copper deposit, but it lacks systematic geological and geochemical studies on the deposit. The main understanding of the genesis of the bed is as follows: 1, the type of porphyry in the mining area is the granodiorite porphyry and the English an porphyry. The two type of porphyry is a high potassium calc alkaline series rock. The trace element cobweb map and the chondrite standard distribution form are basically the same and are homologous. The porphyry enriched large ion stone elements (LILE), such as Ba, Rb, and Pb, are all obvious. The positive anomalies, the relative loss of Nb, Ta and other high field strength elements (HFSE).2, the fluid inclusions in the Gong Po spring copper deposit indicate that 4 types of fluid inclusions are widely developed in the ore bearing vein of the copper ore: pure gas inclusions (type I), pure liquid inclusions (type II), primary rich liquid phase gas-liquid inclusions (type III a) and secondary rich liquid phase gas-liquid package The metallogenic temperature range is between 250 and -500 C, the peak of salinity is 2.0%-6.0% and the density range is 0.75 ~ 1.0g/cm3, indicating that the ore-forming fluid is characterized by middle temperature, low salinity and low density. The laser Raman probe analysis shows that the liquid component is mainly H2O, and the gaseous formation is based on H2, N2, CH4 as the main.3, hydrogen, oxygen, and sulfur isotope analysis shows that the mantle is the mantle. When the mixed magma is rising, a large amount of metallogenic material Cu is brought about by the emplacement, and the S. magma is separated out of the ore-forming fluid along the tectonic fault system of the mining area, and the pressure release of the fluid in the fluid is caused by the sudden release of pressure and the pressure release of the fluid in the fluid. The main reason for the deposit.
【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】：P618.41

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