摘要
小寺沟斑岩钼(铜)矿床成矿温度和成矿压力较高(分别为290~390℃和0.36~0.52GPa),并且从早阶段到晚阶段有降低的趋势。包裹体盐度有高、低两类,高盐度>30wt%NaCl,低盐度<20wt%NaCl,显然,两类包裹体是由盐度为20~30wt%NaCl的热液经沸腾作用而形成。热液中大量HCO_3^-,HS^-,S^(2-),F^-,Cl^-等组分可与成矿元素形成络合物,使成矿元素得以在热液中运移。当热液演化至晚期,由于温度、压力的降低以及酸碱度的变化使络合物分解,成矿物质同时沉淀富集。
It is shown that mineralized temperatures and pressures of the Xiaoshigou porphyry-type molybdenum (copper) ore deposit are higher, 293-390℃ and 0.36-0.52GPa respectively and gradually decrease from the earlystage to the late stage. Inclusions are of higher salinities (>30 wt% NaCleqiv.) and lower salinities (<20 wt% NaCl eqiv.) formed by boiling ofthe hydrothermal fluid of its salinities with about 20-30 wt% NaCl eqiv..A lot of compositions such as HCO_3^-, HS^-, S^(2-), F^-, Cl^- etc. in thehydrothermal fluid may be combined with ore-forming elements to formcomplexes which are carried in the hydrothermal fluid. As a result of thedecrease in temperature and pressure and the change in pH value,complexes were decomposed and ore-forming elements were participatedand concentrated.
基金
国家自然科学基金
关键词
钼矿
铜矿
斑岩矿床
液包体
molybdenum ore deposit
copper ore deposit
porphyry-type ore deposit
inclusion
ore-forming fluid
Hebei