Tectonic controls over mineralization in the Shilipu area of Qixia County
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摘要:
晚侏罗世—早白垩世, 受古太平洋板块俯冲影响, 胶东地区岩浆活动异常活跃, 为胶东地区金矿的形成提供了物源及热源。通过研究栖霞周边金矿区资料, 各NE向断裂如西林-陡崖断裂、栖霞断裂、马家窑断裂等均表现为左旋走滑特征。该断裂活动特征直接影响并控制了该地区如笏山、庄子、山城、马家窑等金矿矿体的形态特征和赋存特征。十里堡矿区内主控矿断裂为矿区中部近EW向具左行走滑的逆冲断裂。经过大量钻探工作, 发现8条矿体, 在其东段及西段均形成了蚀变岩型金矿, 矿体严格受该断裂控制, 矿石主要为碎裂岩、糜棱岩等。中段矿体赋存于该断裂由陡变缓的转折部位, 在压扭性的运动下, 该部位为张性, 提供了成矿空间, 形成了充填石英脉型的金矿体, 与围岩界限清晰。据钻孔资料及周边矿床与构造特征, 推测深部应仍有多层含金石英脉发育。
Abstract:Affected by the subduction of Paleo-Pacific plate during Late Jurassic-Early Cretaceous, magmatic activities were strong in the Jiaodong area.The research results of the gold deposits in the Qixia county show that the NE-trending faults, such as the Xilin-Douya Fault and Qixia Fault all occur in a sinistral strike-slip pattern.The movements of the faults directly control the shape and occurrence of the ore bodies of gold, for examples the Hushan, Zhuangzi, Shancheng ore deposits in the county.In the Shilipu mining district, the main ore-controlling fault is a thrust of sinistral strike-slip, where 8 gold ore bodies have been discovered.The ores in both the east and west segments of the EW fault belong to the type of a broken-altered rock, and the ore bodies in the middle segment, where is the turning point of fault incline angle from steep to gentle, are dominated by quartz vein type of gold.If it is a thrust, the turning point will be tensile and conductive to mineralization.According to the drilling data and the data from surrounding ore deposits, it is speculated that multiple layers of gold-bearing quartz veins may occur in the region.
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Key words:
- Qixia fault /
- sinistral strike-slip /
- gold deposit /
- Shilipu Qixia
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