安徽宁国市西坞口铷矿床赋矿地质特征及找矿标志

GEOLOGICAL CHARACTERISTICS AND PROSPECTING CLUES OF RUBIDIUM DEPOSIT IN XIWUKOU,NINGGUO CITY,ANHUI PROVINCE

西坞口铷矿床是在西坞口矿区锡(钨)多金属矿开展普查工作中,首次发现的铷矿(化)体,对已圈定的铷矿(化)体与锡(钨)矿床对比发现,铷矿(化)体分布范围比锡(钨)矿体分布范围更大,埋藏更深,储量更大,二者为伴生矿床。该矿床产于背斜核部南华纪晚世南沱组(Nh_(2)n)、震旦纪早世两翼蓝田组(Z_(1)l^(1))中。铷的物质来源与燕山晚期岩浆作用密切相关,受隐伏岩体及围岩接触带控制。本文通过对西坞口铷矿床的赋矿地质特征、赋存状态、找矿标志进行分析,希望对今后在扬子陆块江南元古代造山带的北东端地区寻找云英岩型矿床具有一定的指导意义。西坞口铷矿床的发现,对本地区相邻地段寻找同类型矿床具有较好的借鉴作用。

The Xiwukou rubidium deposit is the first rubidium ore(mineralization)body discovered during the general survey of tin(tungsten)polymetallic ore deposit in the Xiwukou mineral district.The comparison between the delineated rubidium ore(mineralization)body and tin(tungsten)deposit shows that the rubidium ore(mineralization)body is larger in range,deeper underneath and bigger in reserve than tin(tungsten)ore body,and the two are associated with each other.The deposit occurs in the anticline core of the Nantuo Formation(Nh_(2)n)of Late Nanhua Period and in the two flanks of Lantian Formation(Z_(1)l^(1))of the Early Sinian.The source of rubidium is closely related to the late Yanshanian magmatism and controlled by concealed rock mass and wall rock contact zone.In this paper,the analysis of the ore-bearing geological characteristics,occurrence state and prospecting clues of the Xiwukou rubidium deposit is hoped to play a guiding role in exploration of greisen type deposit in the northeast end of the Jiangnan Proterozoic orogenic belt in the Yangtze landmass.The discovery of rubidium deposit in Xiwukou has a good reference for searching similar type of deposit in the adjacent part of this area.