| 苏州A型花岗岩的岩浆分异与成矿作用 |
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| 引用本文： | 汪建明,杨年强.苏州A型花岗岩的岩浆分异与成矿作用[J].岩石学报,1993,9(1):33-43. |
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| 作者姓名： | 汪建明 杨年强 |
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| 作者单位： | 江苏省地质矿产测试应用研究所，江苏省地质矿产测试应用研究所，江苏省地质矿产测试应用研究所，江苏省地质矿产测试应用研究所 南京 210018，南京 210018，南京 210018，南京 210018 |
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| 基金项目： | “七五国家重点科技攻关项目三级专题75-55-02-09B |
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| 摘 要： |
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| 关 键 词： | A型 花岗岩 结晶 成矿作用 岩浆 |
THE METALLOGENESIS AND MAGMATIC DIFFERENTIATION OF SUZHOU A-TYPE GRANITE |
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| Wang Jianming Yang Nianqiang Li Kangqiang Ding Guichun.THE METALLOGENESIS AND MAGMATIC DIFFERENTIATION OF SUZHOU A-TYPE GRANITE[J].Acta Petrologica Sinica,1993,9(1):33-43. |
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| Authors: | Wang Jianming Yang Nianqiang Li Kangqiang Ding Guichun |
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| Abstract: | Suzhou A-type granite shows distinct mineralogical and geochemical zonations. Meanwhile, two different types of ore deposits could be found along its marginal areas. If the granite body, as it is in direct contact with pelitic-arenaceous strata, shows such a zonatin: the inner phase is composed of K-feldspar granite, then it is gradually transformed outward through Ab-rich granite to niobitized biotite-rich granite at its outermost part. As it is in contact with limestone, the outer biotite-rich granite phase can no longer be found, instead of it, a zinc, iron (tin, fluorite) ore deposit of skarn type is formed in the outer contact zone. According to the studies of mineralogy, petrology, geochemistry and the investigations of melt inclusions of the zircon crystal of the granite, these zonations were caused by vigorous magmatic differentiation (liquid and crystalline fractionation). During the processes of magmatic differentiation, the ore forming materials are steadily migrating toward the marginal area and then concentrated there. As a good protective layer the pelitic-arenaceous rock formation will prevent the diffusion of the ore-bearing melts(fluids), thus they will be enriched inside the intrusive body to form niobite deposit of magmatic type, while those in contact with limestone, the Zn, Fe(Sn, fluorite) deposit of skarn type will be produced along the outer contact through the process of contact-infiltration metasomatism. |
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| Keywords: | A-type granite Liquid fractionation Crystal fractionation Metallogenesis Suzhou |
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