湖北麻城双庙关金矿床地质特征及找矿方向

双庙关金矿床是湖北麻城地区新发现的金矿床,位于桐柏—大别构造带内。矿体赋存于北东向—北东东向破碎蚀变带中,局部产于近东西向的石英脉中,矿体产状及品位稳定,矿石类型主要为蚀变岩型,石英脉型金矿次之。矿体围岩主要为片麻状二长花岗岩,其次为变辉长岩脉。通过研究双庙关金矿床成矿地质条件和矿床的主要控矿因素,认为该矿床为构造蚀变岩型金矿床,矿体受北东向构造破碎带控制,找矿方向为北东向破碎带内发育的硅化、褐铁矿化(黄铁矿化)变质地质体。通过双庙关金矿与卸甲沟金矿的成矿地质条件对比,认为两者同属于构造蚀变岩型金矿,找矿方向认识对开拓桐柏—大别金矿找矿思路有一定的指示意义。

Geological characteristics and prospecting direction of Shuangmiaoguan gold deposit, Macheng city, Hubei Province

Shuangmiaoguan gold deposit is a newly discovered gold deposit in Macheng area, Hubei Province,where is located in the Wudang-Tongbai-Dabie tectonic belt. Many ore bodies occurs in the NE-NEE fracture alteration zone, and fewoccurs in the nearly EW quartz vein.The occurrence and grade of the ore body are stable. The ore type is mainly altered rock type gold deposit, fewis quartz vein type gold deposit. The surrounding rock of the ore body is mainly gneissic adamellite, secondly is metagabbro vein.Based on the study of the metallogenic geological conditions and the main ore controlling factors of the Shuangmiaoguan gold deposit, it is considered that the deposit is a structural altered rock type gold deposit. The ore body is controlled by the NE structural fracture zone, and the prospecting direction is the silicified and ferritized (pyritized) metamorphic geological body developed in the NE fracture zone.According to the comparison of metallogenic geological conditions between Shuangmiaogon gold deposit and Xiejiagou gold deposit, it is considered that both of them belong to structural altered rock type gold deposit.The the prospecting direction is of significance to the exploration of tungsten ore in Tongbai Dabiemetallogenic belt.