北山地区三道明水Cu-Zn矿床地质特征及矿床成因初探
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P618.41;P618.43

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The geologic feature and genetic mechanism of the Sandaomingshui Cu-Zn deposit in the Beishan area
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    摘要:

    三道明水矿床位于北山成矿带的西部,是近年来新发现的一个中型Cu-Zn矿。为了解该矿床成因类型及主要控矿因素,本文在前期勘探工作的基础之上,对其矿床地质特征,特别是蚀变矿化特征开展了野外及室内研究。根据热液蚀变、矿物组合及脉体间穿插关系的不同,可将三道明水矿床的蚀变和矿化划分为早、中、晚3期。其中,早期矿化以黄铁矿±黄铜矿±闪锌矿、黄铁矿-闪锌矿±黄铜矿组合,以及零星浸染状黄铁矿-黄铜矿-闪锌矿组合为特征,相关的热液蚀变为绿泥石±绢云母,显示出块状硫化物矿床的蚀变矿化特征;中期矿化为该矿床的主要成矿阶段,以浸染状黄铜矿-闪锌矿-黄铁矿组合为特征,相关蚀变为绢英岩化,含Cu、Zn矿物(黄铜矿、闪锌矿)形成于韧性变形过程中;晚期矿化主要以石英±黄铜矿±辉钼矿脉±黄铁矿脉、方解石脉发育为特征,蚀变不明显。基于上述蚀变矿化特征的观察,并通过与区域成矿作用的综合对比,认为三道明水矿床早期可能为块状硫化物型(VMS)矿化,中期经历了韧性剪切变形驱动下的热液改造,在主剪切带富集形成了工业矿体,晚期叠加了岩浆热液有关的Cu-Mo矿化。

    Abstract:

    The Sandaomingshui deposit, located at the western part of the Beishan district, is a recently discovered medium-sized Cu-Zn deposit. Aim to understand its genesis type and controlling factors, geological characteristic of the Sandaomingshui Cu-Zn deposit is studied in this paper. According to the alteration features, mineral assemblages and crosscutting relationships, the mineralization and alteration process have be divided into the early-(stage Ⅰ), middle-(stage Ⅱ) and late-mineralization (stage Ⅲ) stages. The early-mineralization stage is characterized by the occurring of pyrite±chalcopyrite±sphalerite and pyrite-sphalerite±chalcopyrite veins, and disseminated pyrite-chalcopyrite-sphalerite assemblage, with chlorite±sericite alteration occurred in wall rocks, which are similar to VMS-type deposits. The middle-mineralization stage, main mineralization stage, is marked by phyllic alteration and chalcopyrite-pyrite-sphalerite assemblage, in which Cu-Zn-rich minerals (chalcopyrite and sphalerite) occurred during ductile deformation. The late-mineralization stage is featured by the quartz±chalcopyrite±molybdenite±pyrite and calcite veins, with unconspicuous alteration, which were hosted by open fractures. According to the alteration and mineralization features of the Sandaomingshui Cu-Zn deposit and regional mineralization characteristics, Cu-Zn mineralization of the Stage Ⅰ was likely VMS-type. The stage Ⅱ Cu-Zn mineralization overprinted on the stage I and formed the major Cu-Zn orebodies of the Sandaomingshui, which was controlled by ductile shear zones. The stage Ⅲ Cu-Mo mineralization superposed on the earlier Cu-Zn mineralization.

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高树起,王云峰,王晓东,董珍,宗飞超,狄廷川,付旭,2021,北山地区三道明水Cu-Zn矿床地质特征及矿床成因初探[J].岩石矿物学杂志,40(6):1141~1154.

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  • 收稿日期:2020-06-02
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  • 在线发布日期: 2021-11-15
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