河南大河沟—掌耳沟锑矿田地质特征及找矿潜力初评

Geological characteristics of Dahegou-Zhangergou antimony field and evaluation on prospecting potential, Henan

大河沟—掌耳沟锑矿田位于我国重要锑成矿带之一的东秦岭北锑—汞矿带的东部。迄今为止,矿田内已发现中型锑矿床1个,小型锑矿床3个,锑矿点9个。作者在收集矿田以往勘查和科研资料成果的基础上,对成矿地质背景、矿床地质特征、地层的含矿性、硫同位素特征、矿物包裹体特征以及成矿环境等进行了分析,发现成矿受地层和构造双重控制作用明显,矿床(点)均产于古元古界秦岭群雁岭沟组中,矿体的分布严格受朱阳关—夏馆深大断裂及次一级构造的控制。因此,矿床的成因可归纳为与低温热液有关的层控矿床,即多成因—多阶段复合成因的层控矿床,具有广阔和良好的找矿前景。

Dahegou - Zhangergou antimony orefield is located in the east of Sb - Hg metallogenic belt in northern part of East Qinling Mountain which is one of important antimony metallogenic belts. Up to now, one medium - sized, three small - sized antimony deposits, nine antimony deposit points, and so many other deposits have been found there. The authors consider that mineralization is obviously controlled by strata and tectonic, and that the deposit points occurred in Qinling Group, Yanlinggou formation, lower Proterozoie, and that the distribution of ore bodies are strictly controlled by Zhuyangguan - Xiaguan deep fracture and secondary tectonic, on the basis of previous survey and research results collected and analysis of geological setting, deposit geological characteristics, stratic ore - bearing, characteristics of sulphur isotope, characteristics of ore body inclusions, and metallogenic environment. So ore genesis is attributed to epithermal stratabound ore deposit, which is also called polygenetic - multistage stratabound ore deposit. All these discoveries indicate good prospects for mineral exploration.