湖南黄沙坪矽卡岩矿物学特征及地质意义

发布时间：2018-07-10 10:51

本文选题：黄沙坪 + 矽卡岩　；参考：《现代地质》2016年05期

【摘要】：湘南黄沙坪多金属矿床位于南岭构造带中段北缘,属于矽卡岩型矿床。根据矽卡岩产出状态、矿物共生组合及岩相学特征,从早期到晚期可划分为矽卡岩阶段、退化蚀变阶段、早期硫化物阶段和晚期硫化物阶段。矽卡岩矿物主要为石榴石、辉石、符山石等;金属矿物主要为白钨矿、辉钼矿、磁铁矿、方铅矿、闪锌矿等。电子探针分析结果表明,石榴石为钙铝-钙铁榴石系列,从早期到晚期,石榴石具有由钙铝榴石逐渐向钙铁榴石演化的规律。且钙铁榴石普遍发育震荡环带,而环带结构可持续记录钙铁榴石物理化学条件演化的过程。同时两种石榴石中均含Sn的成分,但钙铁榴石中Sn的含量明显高于钙铝榴石。辉石为透辉石-钙铁辉石系列,而且由内接触带向外接触带,辉石中Fe和Mn的含量有逐渐升高的趋势。矽卡岩矿物学特征及矿物成分的变化表明,成矿流体至少经历了两次氧化还原性质的转变。矽卡岩矿物学特征,对W(Sn)-Mo-Bi等多金属的矿化具有重要的地质指示意义。
[Abstract]:Huangshaping polymetallic deposit in southern Hunan is located in the northern margin of the middle section of Nanling tectonic belt and belongs to skarn type deposit. According to the occurrence state of skarn, mineral symbiotic assemblage and petrographic characteristics, it can be divided into skarn stage, degenerative alteration stage, early sulfide stage and late sulfide stage from early to late stage. Skarn minerals are mainly garnet, pyroxene, fushanite and so on, while metal minerals are mainly scheelite, molybdenum, magnetite, galena, sphalerite and so on. The results of electron probe analysis show that garnet is a series of calcium aluminum-calcium ferrite garnet. From the early to the late period the garnet evolves from calcium aluminite to calcium iron garnet. The oscillatory zone is generally developed in calcium ferrite, and the structure of the ring can record the evolution of physicochemical conditions of calcium iron garnet. At the same time, both garnets contain Sn, but the content of Sn in calcium iron garnet is obviously higher than that in calcium aluminous garnet. The pyroxene is a diopside-calcium ferroxene series, and the contents of Fe and mn in the pyroxene tend to increase gradually from the inner contact zone to the outer contact zone. The mineralogical characteristics and mineral composition of skarn indicate that the ore-forming fluid has undergone at least two redox changes. The mineralogical characteristics of skarn play an important role in the mineralization of W (Sn) -Mo-Bi.
【作者单位】：中国地质大学(北京)科学研究院;湖南有色股份黄沙坪矿业分公司;
【基金】：湖南有色股份黄沙坪矿业分公司的大力支持
【分类号】：P578;P618.2

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