摘要
长江中下游海相三叠系膏盖层中含有很大比例的大、中型铜（金）、铁、多金属矿床。膏盐层不仅是铜（金）、铁矿床的主要赋矿层位之一，而且是部分成矿金属的矿源层；膏盐层还为燕山期岩浆提供部分钠质、钾质及挥发组分，影响岩浆演化的方向，改变了含矿流体的性质；另外，从岩体和矿床中金属硫化物中流同位素重硫成分的增高，说明在成者、成矿过程中，膏盐层是硫的供应者之一。因此膏盐层与铜（金）、铁、多金属矿床之间存在着特殊的成因联系。
A great ptuportion of large and medium sized Cu(Au), Fe polymetal deposits yields inthe marine Triassic evaporite horizons in the Middle-Lower Yangtze area. Evaporite horizons(anhydrite-gypsum with more or less halite, intercalated lamihal dolomites and limestones ) inthe area are not only the hosting sediments of the Cu, Fe ores, but also their material source ofthe ores. In addition, the evaporite horizons also supplied alkaline and volatile components tothe Yanshania magma, effected its evolution trend; converted the character of ore-forming flu-ids, and increase the δ34S value of the magmatic rocks. It might be also an important sulphuricsupply to the sulphide minerals in the metallogenic precess. The close relationship between themarine Triassic evaporite horizon with the Cu (Au ), Fe polymetal deposits is discussed in this paper.
出处
《火山地质与矿产》
1995年第2期32-41,共10页
Volcanology & Mineral Resources
基金
国家攀登项目!30-12
国家自然科学基金!490272104
关键词
铜矿床
铁矿床
金矿床
膏盐层
地层
marine Triassic evaporite, Cu (Au ), Fe polymetal deposits, Middle-Lower Yangtze area
