湘东北虎形山钨铍多金属矿的控矿规律及找矿方向

Ore-controlling regularity and prospecting direction of Huxingshan W-Be polymetallic deposit in the northeast of Hunan Province

湘东北虎形山钨铍多金属矿是近年来发现的特大型钨铍矿床。通过矿区找矿工作及科研专题工作,对矿区的控矿规律及找矿方向有些肤浅认识:虎形山矿区主要矿种为钨矿,钨矿物以白钨矿、黑钨矿为主,铍矿作为伴生矿种,主要矿物为绿柱石。虎形山矿的成因经历了高→中低温→表生淋滤成矿三个阶段,而钨铍成矿属于早期气成高温热液阶段,含矿热液主要来源于深部侵入的酸性岩浆,沿近EW走向的F_1高倾角的逆冲推覆断裂构造侵入上升,在F_1的主构造带内及下盘赋矿。F_1下盘的寒武系牛蹄塘组灰岩段是钨铍成矿极为重要的赋矿层位,原因是层位中富含钙质,与热液交代易形成白钨矿体。以此为成矿模式,圈定了矿区F_1下盘隐伏岩体外接触带以含钙质地层为主的钨铍找矿靶区。

Huxingshan W-Be polymetallic deposit is located at the northeast part of Hunan Province,which is a super-large scale W-Be deposit found out in the recent years.Through the mining prospecting work and project research,the author has some superficial understanding of ore-controlling regularity and prospecting direction for the mining area as follows.The main mineral kinds in Huxingshan mining area are scheelite and wolframite,and beryllium minerals are accompanying mineral resources as the main mineral is beryl.Huxingshan mineralization process is divided into three stages,high temperature,low-moderate temperature and supergene leaching stages.Beryllium and tungsten mineralization is mainly belonged to the hydrothermal stage of high temperature,when hydrothermal fluid is derived from the deep acidic magma,which is generally intruding and rising along the F_1 thrust nappe system of high dip angle in near EW striking.The ore body is formed under F_1 main structural belt and its footwall.The limestone section of Liutitang group of Cambrian system is extremely important for totungsten and beryllium mineralization in the F_1 footwall because of the rich calcium materials which is metasomatosed with hydrothermal fluid to form scheelite easily.As a metallogenic model,the target area of tungsten and beryllium mineralization prospecting,with the calcium as the main layer,is determined out in the outside contact belt of the concealed magmatic rock mass in the F_1 footwall.