河南省祈子堂金矿床地质特征与外围找矿方向

Geological characteristics and peripheral prospecting direction of Qizitang gold deposit in Henan Province

祈子堂金矿位于秦岭构造带北秦岭构造亚带秦岭地体东段,其构造体系属秦岭东西复杂构造带东段南支,四棵树大背斜南西翼,朱阳关—夏馆深大断裂的北东侧。通过对矿区地质特征、地球化学特征、矿化特征及围岩蚀变综合分析,总结了该矿床的成矿阶段及成矿因素,认为该矿床为热液蚀变岩型金矿床,确定了找矿标志,探讨了深部及外围找矿方向。研究表明:祈子堂矿区金矿体赋存于秦岭群雁岭沟组大理岩的构造破碎蚀变带中,矿体严格受断裂构造控制,矿区中东部有少量花岗岩脉,显示了区内有花岗岩类岩浆活动,判断其岩浆源应在深部,推断金的矿化作用与花岗岩类岩浆活动有密切的成因联系,本区岩浆仅提供热动力条件,它的成矿物质可能来源于围岩,围岩是秦岭群雁岭沟组白云石大理岩,围岩金丰度值低,有可能是经过渗滤、萃取作用而使Au元素进入含矿热流体,岩浆活动仅提供热动力,热液沿着区域深大断裂的次一级构造上升,萃取围岩成矿物质后在有利构造部位富集成矿。所有这些均显示了祈子堂地区具有良好的成矿条件,该区已知金矿床、矿点分布稳定,延续成带,具有良好的找矿前景。

The Qizitang gold deposit is located in the eastern part of the Qinling terrane in the North Qinling tectonic sub-zone of the Qinling tectonic belt.Its tectonic system belongs to the southern branch of the eastern section of the Qinling East-West complex tectonic belt,the southwestern wing of the Sikeshu large anticline,and the northeast side of Zhuyangguan-Xiaguan deep large fault.Based on the comprehensive analysis of geological characteristics,geochemical characteristics,mineralization characteristics and surrounding rock alteration of the mining area,the metallogenic stages and factors of the deposit are summarized.It is confirmed that the deposit is a hydrothermal altered rock-type gold deposit.The prospecting mark is determined.The exploration direction is discussed in the deep and peripheral areas.The study shows that the gold ore body in the Qizitang mine area is located in the structural fracture and alteration zone of the marble in the Yanlingou Formation of the Qinling Group.The ore body is strictly controlled by the fault structure.There are a few granite veins in the middle and eastern part of the mining area,indicating that there are magmatic activities of granites in the area.It is infereed that the magma source should be in the deep.It is considered that the gold mineralization has a close genetic relationship with the granitoid magmatism.The magma in this area only provides the thermodynamic condition,and its ore-forming materials may come from the dolomite marble of the Yanlingou Formation of the Qinling Group.The gold abundance value of the surrounding rock is low.It is inferred that the gold element enters the ore-bearing thermal fluid after infiltration and extraction.The magmatic activity only provides thermal power.The thermal fluid rises along the second-level structural facture zone of regional deep fault,and the mineralization materials of the surrounding rocks are extracted and the thermal fluid is enriched and accumulated in the favorable structural parts.All of these show that has there is a good metallogenic condition in Qizitang area.The known gold deposits and ore spots spread steadily and continue to form a belt in this area.There is a good prospecting perspective in the area.