广西河池五圩矿田箭猪坡矿区主要成矿元素富集规律

箭猪坡矿床位于羌塘-扬子克拉通滇黔桂被动陆缘南盘江—右江裂谷盆地南丹坳陷带的东南缘,属湘中—桂中北(坳陷)成矿带桂中北成矿亚带芒场-大厂成矿带。主要含矿地层为下泥盆统塘丁组灰黑色条带状及薄层状绢云母泥岩,矿区内NNW向的张扭性断裂,是矿床的主要控矿构造,矿脉的产状及形态,严格受其控制。在总结前人认识基础上,通过野外地质工作以及分析该区的岩浆岩、矿物流体、矿化体特征、矿体空间分布、元素组合分布等,结合矿山探矿巷道揭露的矿化体,发现该区成矿元素富集以300号勘探线为中心,往两侧呈正态分布,在延深方向200 m高程处元素组合开始发生变化,Sb、Sn元素含量增高,且在-200 m高程处形成锡矿脉。研究结果不仅有助于了解矿液来源、元素富集规律、矿化过程等,而且为矿山下一步深部找矿提供了依据和靶区。

Enrichment regularity of main ore-forming elements in Jianzhupo mining area in Wuxu orefield,Hechi City,Guangxi

Jianzhupo deposit is located at the southeast margin of the Nandan Depression in the Nanpan River-Youjiang Rift Basin on the passive continental margin of Yunna-Guizhou-Guangxi of Qiangtang-Yangtze Craton.It belongs to Mangchang-Dachang metallogenic belt of Central-North Guangxi metallogenic subzone of Central Hunan-Central North Guangxi metallogenic zone.The main ore-bearing strata are gray-black banded and thin-bedded sericite mudstones of the Lower Devonian Tangding formation.The NW-trending tension-torsion fault is the main ore-controlling structure in the mining area,which has strictly controlled the occurrence and shape of ore veins.On the basis of the previous research result,and field geological work and analysis of the characteristics of magmatic rocks,mineral fluids,mineralization bodies,spatial distribution of orebodies and element assemblage distribution,with the combination of the orebodies exposed in the prospecting tunnel,it is found that the ore-forming elements are concentrated in the center of the prospecting line No.300 and are normally distributed on the both sides,and the element assemblage begins to change at 200 m elevation in the direction of deepening extension.Sb and Sn contents increase higher and a tin vein is formed at-200 m elevation.The study result is not only helpful to understand the source of ore fluid,the element enrichment regularity and mineralization process,but can also provide the basis and target area for the next deep prospecting work in the mine.