湖北大悟娘娘顶钨铍矿地质特征及找矿方向

摘要

湖北大悟娘娘顶钨铍矿区处于华北板块与扬子板块之间的桐柏-大别造山带中部,区内元古宙地层出露广泛,岩浆活动频繁,构造具有多期次性.矿区内钨铍矿床产于花岗岩体接触带上,与燕山晚期娘娘顶岩体、鸡公山岩体密切相关.本文在分析了娘娘顶钨铍矿成矿地质背景和矿床地质特征的基础上,进行了勘查地球化学研究,圈定了2处化探异常,指出本区内燕山晚期花岗岩与地层、岩体间接触带及构造破碎带部位为重点找矿地带及找矿方向.本次研究既填补了武当-桐柏-大别成矿带钨铍矿相关矿产研究方面的空白,又首次描述了研究区内铍矿床的地质特征,补充了国内研究相对很少的铍矿床方面的内容,同时为研究区乃至大别山地区下一步钨镀矿种的勘查工作提供了一定的理论依据和指导意义.%The Niangniangding tungsten-beryllium mining area in Dawu County of Hubei Province is located in the middle of the Tongbai-Dabie orogenic belt between the North China plate and the Yangtze plate.Proterozoic strata outcropped in the area are widespread,magmatic activity is frequent,and the bleak structure is developed,which exhibits a multi-periodic characteristic in the area.The ore deposit occurs along the granite rock contact zone and has close relationship with the late Yanshanian Niangniangding and Jigongshan rock bodies.Based on an analysis of characteristics of metallgonenic geological setting,geological characteristics of the deposit and the two geochemical anomalies in the Niangniangding tungsten-beryllium ore deposit in this area,the paper puts forward the key ore-prospecting orientation,which points to areas of the contact zone between the late Yanshanian granite and strata,rock mass and tectonic fracture zone area.This study not only fills the blank of tungsten-beryllium deposits in Wudang-Tongbai-Dabie metallogenic belt and describes the geological features of beryllium deposit for the first time so as to supply material for the research but also provides a certain theoretical basis and guiding significance for the study area and even for the whole Dabie region so as to help further tungstenberyllium minerals exploration.