摘要
陕西金堆城斑岩钼矿床是中国最大的钼矿床之一，按照脉体相互切割关系，成矿过程可分为两期十个阶段。矿区内流体包裹体研究表明：成矿流体以富ＣＯ２为特征，温度介于８３℃～４１２℃之间，盐度介于２７５～４２５ｗｔ％ＮａＣｌ和０６１～１７ｗｔ％ＮａＣｌ两个区间内，具有典型的双配分模式特征。氢、氧同位素资料研究表明成矿物质主要来自岩浆流体。晚阶段有大量雨水混入热液流体中，导致流体的温度、盐度和δ１８ＯＨ２Ｏ、δＤ值降低，引起了成矿流体中的钼金属沉淀，形成了金堆城超大型斑岩钼矿床。
The Jinduicheng Porphyry Molybdenum Deposit, Shanxi Province is one of the largest molybdenum deposits in China. Based on the observation of the cross-cut ting sequence of veins, the whole ore-forming process can be divided into two periods and ten stages. The analysis of fluid inclusions in quartz indicates that the ore-forming hydrothermal system is rich in CO 2. The average homogenization temperature ranges from 83 to 412℃. The salinty of metallogenetic fluid manifests bimodal distribution pattern with two ranges from 27.5 to 42.5wt%NaCl and from 0 61 to 17wt%NaCl equiv. The values of oxygen and hydrogen isotope show that the major source of metallogentic element is magmatic fluid. At the last stage large amount of meteoric water was mixed into the hydrothermal system, leading to decrease of temperature, salinity,δ 18 O H 2O and δD, and to precipitation of molybodnite which formed the main body of the super-large Jinduicheng molybdenum deposit .
出处
《高校地质学报》
CAS
CSCD
1998年第4期423-431,共9页
Geological Journal of China Universities
基金
国家自然科学基金
南京大学内生金属矿床成矿机制国家重点实验室资助
关键词
斑岩钼矿床
成矿流体
包裹体
钼矿床
矿床成矿
porphyry molybdenum deposit, ore-forming fluid, inclusions, Jinduicheng
