新疆包古图斑岩型铜钼矿床容矿岩石及蚀变特征
Host-rocks and alteration characters of the Baogutu porphyry copper-molybdenum deposit in Xinjiang, NW China
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摘要: 新疆包古图斑岩型铜钼矿床位于西准噶尔晚古生代达拉布特岛弧南部。根据容矿岩石、热液蚀变和矿化特点，结合成矿元素Cu-Mo-(Au)组合特征，认为该矿床是斑岩型铜钼矿床。 研究识别出含矿岩体是一个岩性和岩相复杂的中性斑岩体，岩性主要为闪长岩、似斑状(石英)闪长岩、(石英)闪长玢岩、隐爆角砾岩和各种脉岩，有少量的花岗闪长岩，岩相从岩体中心向外依次为中心相、主体相和边缘相，稍晚形成的深部隐爆相叠加在上述各岩相上。浸染状和细脉浸染状矿化赋存于岩体各岩相尤其是深部隐爆相中，少量赋存于围岩中。热液蚀变填图和研究显示，蚀变从岩体中心向外依次为由钾硅酸盐化和石英绢云母化组成的叠加带、角岩化带和青磐岩化带，与Hollister的模式类似。矿体主要赋存于叠加带中，部分赋存于角岩化带中。包古图斑岩型铜钼矿床中性岩浆-流体活动控制着岩体的蚀变与矿化。Abstract: The Baogutu porphyry copper-molybdenum deposit locates in the Darbut magmatic arc of the western Junggar. Based on the host rocks, alterations in stock and wall-rocks, and disseminated and network mineralization, together with Cu-Mo-(Au) association, the Baogutu deposit is a porphyry copper-molybdenum deposit. Our research recognized that the Baogutu intrusion is an intermediate porphyry with several lithologies and lithofacies. The host rocks are diorite, porphyaceous (quartz) diorite, (quartz)diorite porphyry, minor granodiorite, related breccias and various dikes. We have recoginized the four lithofacies that are central, principal, and border phases from centre outwards and the related breccias phase which occurs in inner stock and wall-rocks and overprints the earlier other three phases. Disseminated and network mineralization mainly occurred inner the stock and minor in the outer wall-rocks. Alterations in stock and wall-rocks have overprinting zonation with blurry boundary. The alteration mapping in the Baogutu district shows that the three zones can be broadly distinguished according to the altered mineral assemblages. The concentric alteration zones from the inner outwards are successively the overprinting zone of the K-silicate zone and the quartz-sericite zone, hornfelsed zone, and the propylitic zone, being similar to the Hollister-type alteration model. Quartz-sericite zone overprints both the K-silicate zone and the hornfelsed zone. The ore bodies mostly occur in the overprinting zones of the K-silicate zone and the quartz-sericite zone, locally occurs in the hornfelsed zone. Our research suggests that the mineralization and alteration occurred in the Baogutu porphyry Cu-Mo deposit is closely related with the intermediate porphyry in which the deposit occurred.
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Key words:
- Porphyry copper-molybdenum deposit /
- Intermediate porphyry /
- Diorite /
- Alteration zoning /
- Baogutu /
- Xinjiang
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