湘西两溪口金矿床地质特征及找矿标志

湘西两溪口金矿床位于雪峰弧形构造隆起带中段。该矿床目前研究仅限于成矿背景分析,未能深入剖析其矿床地质特征。本文通过两溪口金矿床地质勘查工作,对该矿床区域成矿构造背景、矿床地质、地球化学特征等方面进行研究,分析矿床成因、研究其成矿规律、梳理总结找矿标志,为研究区进一步找矿提供参考。认为研究区金矿化主要产在青白口系冷家溪群小木坪组(Qbx)中厚层状粉砂质板岩及板溪群马底驿组(Qbm)中—上部钙质紫红色板岩或条带状紫色板岩中,矿化类型为石英脉及构造蚀变岩型,矿(化)体受构造控制明显。本文建立了以地球化学特征、赋矿层位、控(容)矿构造、围岩蚀变特征为野外工作找矿标志,揭示研究区内找矿潜力较大。

Geological characteristics and prospecting indicator of the Liangxikou gold deposit in Western Hunan Province

The Liangxikou gold deposit in Western Hunan located in the middle of the gold-antimony-tungsten comprehensive mineralization zone in Xuefeng arc structural uplift. This paper aims to sort out the geological exploration data of Liangxikou gold deposit, study the regional metallogenic tectonic background, metallogenic law, geological and geochemical characteristics of the deposit, analyze ore genesis of this deposit, summarize the prospecting signs of the mining area, and provide direction and reference for prospecting in this area. It is considered that gold mineralization in this area mainly occurs in the medium-thick silty slate of the Xiaomuping formation of Lengjiaxi group of the Qingbaikou system and calcium bearing purplish red slate or banded purple slate in middle-upper part of the Madiyi formation of Banxi group. The mineralization type is quartz vein and structural altered rock type, and ore body is obviously controlled by structure. The geochemical characteristics, ore bearing horizon, ore controlling structure and wall rock alteration characteristics are established as the prospecting indicators for further field work. It reveals that there is great prospecting potential in the study area.