鲁山棚沟金矿床包裹体特征及找矿意义

棚沟金矿床赋存于华北古陆块南缘前寒武纪花岗岩中，在空间上受区域韧性剪切带中的燕山末期花岗斑岩控制。根据矿床地质特点判断属中低温热液型金矿。通过岩石矿物组合及包裹体组成、性质、同位素等测试，确定成矿物质来源于围岩，成矿流体来源于变质水且有岩浆水与雨水的混入。通过电子探针测定的岩矿组分，计算围岩成岩及变质温度，以及成矿温度、压力和沉淀条件，认为金矿床的成矿作用，主要表现为减压环境中的岩浆热液充填和交代蚀变，以及热液的泡腾作用。从找矿标志角度确定富ＣＯ２的泡腾包裹体群、液相高硫富ＨＣＯ－３、气相高ＣＯ２和高ＣＯ２／Ｈ２Ｏ比值等参数是寻找此类金矿的重要标志

THE FEATURES AND PROSPECTING SIGNIFICANCE OF THE INCLUSION OF PENGGOU GOLD DEPOSITS

The Penggou gold deposits hosted in the Precambrian granites of the southern margin in North China old landmass and were controlled by the terminal Yanshan granite porphyry in regional ductile shear zones in space. On the basis of geological characteristics of ore deposits,they belonged to the low to moderate hydrothermal gold deposits.By the association of rock and mineral, composition and property of the inclusion and testing of isotope etc.,the authors indicated that the mineralizing matter came from the wallrock, the mineralizing fluid came from the metamorphic water and mixed water of magmatic water and rainwater. According to the diagenetic and metamorphic temperature of wallrock, the temperature and pressure and precipitating condition of mineralization calculated on the components of rock and mineral determined by microprobe analysis, the authors have considered that the mineralization of gold deposits mainly displaied the magmatic hydrothermal filling and metasomatic alteration in the decompressional environment as well as hydrothermal effervescence action. The important signs prospecting this typal gold deposits are the effervescence inclusion group of the rich in CO 2, liquid phase high sulfur rich in HCO - 3,gaseous phase high in CO 2 and high proportionality of CO 2/H 2O etc.