| 阳储岭斑岩钨钼矿床蚀变分带特征及与成矿作用关系的初步研究 |
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| 引用本文：.1988.A preliminary study on alteration zoning of the Yangchuling porphyry W-Mo deposit and its relationship to mineralization[J].Mineral Deposits,7(3):50~59 |
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| 中文摘要:阳储岭斑岩钨铝矿床热液蚀变具有明显分带特征，为一不同时问(阶段)的热液作用于同一空间的叠加中心式蚀变矿化模式。由斑岩体中心向外依次发育钾硅化一石英绢云母化一绿泥石碳酸盐化等蚀变带，与之相对应的矿化带为W(Mo)一Mo(W)一FeS2。蚀变矿化温度由斑体中心向外依次降低(310～230℃→260～200℃→170℃)，氧同位素分馏亦呈现出由强一弱一没有分馏的变化规律。说明本区热液蚀变矿化作用在斑岩体的中心部位最为活跃，强度最大。矿液是由斑岩俸中心向外逐渐扩散，至围岩由于变质岩系的屏蔽作用而中止在接触带处。 |
| 中文关键词:斑岩型钨锢矿床 叠加中心式蚀变矿化分带 蚀变与成矿关系 江西阳储岭 |
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| A preliminary study on alteration zoning of the Yangchuling porphyry W-Mo deposit and its relationship to mineralization |
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| Abstract:The Yangchuling porphyry W-Mo deposit lies at the connection of Jiuling upwarping zone in Northern Jiangxi and Lower Yangtze downwarping zone. The ore-related magmatic rocks were formed in Late Jurassic and emplaced in epimetamorphic series of Middle Proterozoic Shuangqiaoshan Group. The ore-forming intrusive body is a complex rock body formed through intrusion of cognate magma in identical period but different stages, accompanied by concealed decrepitation. The rocks are intermediate-acid-acid in nature, belonging to family 4-5. class 2 of Zavaritski’s chemical classification. Multi-stage petrogenic activities are associated with several times of alteration and mineralization. The W-Mo orebody occurs in middle and upper part as well as the top of the potphyry body, has no distinct boundary with the tuck body, takes stratoid or irregular forms, strikes northwestward and eastward with gentle dip angle. Ores are veinlet-disseminated in shape. The orebody is characterized by large size, small buried depth, low grade and easy mining and dressing. Hydrothermal alteration of the ore deposit shows obvious zoned characteristics, belonging to a superimposed central type alteration mineralization model resulting from the action of hydrothermal fluids of different periods (stages)on the same space. From the center of the porphyry body outward, there exist alteration iones in order of potash silicification→quartz sericitizati→chlorite carbonatization, with the corresponding mineralization zones being W(Mo)一Mo(W)一FeS2, the alteration mineralization temperature gradually decreases(310一230℃→260一200℃→170℃), and the oxygen isotope fractionation varies from strong through weak to no fractionation. The porphyry tungsten deposit in Mt. Pleasant, New Brunswick, Canada has similar alteration zoning model, and the wall rock alteration of the Lianhuashan porphyry tungsten deposit in Guangdong province is also characterized by superimposition of multi-stage alteration. It is therefore concluded that the complex alteration zoning model formed as a result of superposition of poly-phase and multi-stage alterations is a common character for hydrothermal alteration of porphyry tulngsten deposits. |
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