| 云南省马厂箐Cu-Mo-Au矿床花岗斑岩成矿地质证据 |
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| 引用本文：郭晓东,王治华,王 欣,刘 烊,周晓锋，王绍明.2010.Metallogenic evidence of granite porphyry in Machangqing porphyry-type Cu-Mo-Au deposit of Yunnan Province[J].Mineral Deposits,29(5):890~902 |
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| 基金项目:本文得到“十一五”国家攻关项目(编号：2006BAB01B10)和武警黄金指挥部专项基金(编号：HJ09-02)资助 |
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| 中文摘要:马厂箐铜钼（金）矿床是金沙江-哀牢山构造带内与喜马拉雅期富碱侵入岩有关的典型的斑岩型矿床之一，其铜钼（金）矿（化）体在空间上与花岗斑岩紧密相伴，且主要位于花岗斑岩脉（体）的上、下盘。花岗斑岩内发育有具斑岩型矿化特征的细网脉状、浸染状矿化，其上盘的（似）斑状花岗岩和下盘的向阳组围岩内均发育有脉状、细脉状矿化，且总体表现出向接触带附近花岗斑岩倾斜的特点。（似）斑状花岗岩中的矿化脉体北倾，围岩地层中的矿化脉体南倾。花岗斑岩脉（体）上、下盘的矿化脉体表现出越靠近接触带（花岗斑岩脉体）蚀变矿化越强、矿化体的规模越大、出现的频率越高，而远离接触带（花岗斑岩脉体）则蚀变矿化越弱、矿化体的规模越小、出现的频率越低。铜钼（金）的成矿时代与花岗斑岩的成岩时代较为一致，其同位素年龄集中在34～36 Ma。花岗斑岩含有源于富集地幔的镁铁质暗色微粒包体，并发育浸染状的黄铁矿化、磁铁矿化。暗色微粒包体及其寄主岩（花岗斑岩）具有同源性，且与壳_幔岩混合作用及成分分异有关，具有提供成矿物质、成矿流体的基础。因此，该区的铜钼（金）成矿与花岗斑岩有关。 |
| 中文关键词:地质学 花岗斑岩 成矿证据 斑岩型铜钼金矿床 马厂箐 云南 |
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| Metallogenic evidence of granite porphyry in Machangqing porphyry-type Cu-Mo-Au deposit of Yunnan Province |
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| Abstract:The Machangqing Cu-Mo-(Au) deposit is one of the typical porphyry-type deposits related to alkali-rich intrusive rocks of the Himalaya period in the alkali-rich rock belt of western Yunnan. Cu-Mo-(Au) mineralizations are closely associated with the granite-porphyry in space and are mainly located in the upper-lower wall of granite-porphyry dykes. Granite-porphyry assumes such porphyry metallogenic characteristics as fine stockwork and disseminated mineralization. The ore deposit mainly inclines to the granite-porphyry near the contact zone, the mineralized dykes of the porphyritoid granite incline to the north, and the mineralized dykes in host strata incline to the south. Mineralized dykes in the upper-lower walls show features that the nearer to the contact zone (the granite-porphyry dyke), the stronger the alteration, the bigger the mineralized body, and the easier the ore-prospecting work. On the contrary, the farer away from the contact zone (the granite-porphyry dyke), the weaker the alteration, the smaller the mineralized body, and the more difficult the ore-prospecting work. The metallogenic epoch of Cu-Mo-(Au) is the same as the granite-porphyry, and the isotope ages are focused on 35～36 Ma. The granite-porphyry contains dark microgranular dioritic xenoliths from the mantle, and has disseminated pyritization and magnetization. Dark microgranular dioritic xenoliths and their host rock granite-porphyry were derived from the same source, and were related to crust-mantle mixing and compositional differentiation, thus providing ore-forming materials and fluids. Therefore, copper-molybdenum mineralizations are related to the granite-porphyry. |
| keywords:geology, granite-porphyry, metallogenic evidence, porphyry-type Cu-Mo-Au deposit, Machangqing, Yunnan |
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