江西省大湖塘石门寺矿区超大型钨矿的发现及找矿意义
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摘要
江西省武宁县大湖塘石门寺超大型钨矿的成功勘查是我国地质找矿工作的重大发现。矿化类型划分为细脉浸染型、隐爆角砾岩型和石英大脉型。前者占总储量的74%,该类型以晋宁晚期黑云母花岗闪长岩为容矿围岩,以燕山中期酸性深成至浅成花岗岩为成矿母岩。矿体厚大且产状平缓,大致平行于黑云母花岗闪长岩与似斑状黑云母花岗岩株顶部的接触面分布,以外接触带为主(Ⅰ1矿体),水平投影面积1.50km2,单工程最大厚度389.33m,平均厚度143.67m,平均品位0.193%,厚度变化系数63.7%,品位变化系数115.8%。工业矿物主要为白钨矿、黑钨矿、黄铜矿、辉钼矿。矿石组构类型主要有结晶结构、交代结构、细脉状构造、浸染状构造,常见近矿围岩蚀变为黑鳞云母化、云英岩化、绿泥石化,成因类型属岩浆期后高中温热液矿床,工业类型可划归为细脉浸染型白钨矿。石门寺矿区以黑云母花岗闪长岩为容矿围岩的细脉浸染状白钨的发现,改变了以往只专注评价石英大脉型黑钨矿的找矿思路,为矿区及九岭矿集区实现钨多金属找矿突破指明了新的方向。
The successfully exploration of Shimensi super-large tungsten deposit,Dahutang area,Wuning county,Jiangxi Province,is an important discovery of the geological prospecting work in our country.The mineralization type of the deposit is divided into veinlet-disseminated type,cryptoexplosion breccia type and quartz thick vein type.The host rock of the veinlet-disseminated type deposit which accounting for about 14.86 percent of total reserves,are the Late Jinningian biotite granodiorites and the mineralization mother rock are the middle stage of Yanshan solid plutonic-hypabyssal granites.The orebodies are thick with gentle occurrence and appromately parallel to the contact surface of biotite granodiorite and the top of porphyraceous biotite granite stock.In addition,some features of the orebodies are described in this paper,such as external contact zone is important contact type(Ⅰ1 orebody),horizontal projective surface area is 1.50km2,maximum thickness of single engineering is 389.33m,average thickness and grade are respectively 143.67m and 0.193%,change coefficient of thickness and grade are 63.7% and 115.8%,respectively.Industrial minerals are scheelite,wolframite,chalcopyrite and molybdenite.Ore textures are mainly crystal structure,metasomatic texture,ore structures are mainly veinlet and disseminated and wall rock alteration are protolithionite,greisenization and chloritization.It is a postmagmatic hydrothermal deposit with high-middle temperature and is divided into veinlet disseminated scheelite.It is found that biotite granodiorite is the host rock of veinlet disseminated scheelite in Shimensi mining area,which change the prospecting thinking of paying more attention to quartz thick vein wolframite and point a new direction for tungsten polymetallic ore-search breakthrough in this area and Jiuling ore concentrating area.
The successfully exploration of Shimensi super-large tungsten deposit,Dahutang area,Wuning county,Jiangxi Province,is an important discovery of the geological prospecting work in our country.The mineralization type of the deposit is divided into veinlet-disseminated type,cryptoexplosion breccia type and quartz thick vein type.The host rock of the veinlet-disseminated type deposit which accounting for about 14.86 percent of total reserves,are the Late Jinningian biotite granodiorites and the mineralization mother rock are the middle stage of Yanshan solid plutonic-hypabyssal granites.The orebodies are thick with gentle occurrence and appromately parallel to the contact surface of biotite granodiorite and the top of porphyraceous biotite granite stock.In addition,some features of the orebodies are described in this paper,such as external contact zone is important contact type(Ⅰ1 orebody),horizontal projective surface area is 1.50km2,maximum thickness of single engineering is 389.33m,average thickness and grade are respectively 143.67m and 0.193%,change coefficient of thickness and grade are 63.7% and 115.8%,respectively.Industrial minerals are scheelite,wolframite,chalcopyrite and molybdenite.Ore textures are mainly crystal structure,metasomatic texture,ore structures are mainly veinlet and disseminated and wall rock alteration are protolithionite,greisenization and chloritization.It is a postmagmatic hydrothermal deposit with high-middle temperature and is divided into veinlet disseminated scheelite.It is found that biotite granodiorite is the host rock of veinlet disseminated scheelite in Shimensi mining area,which change the prospecting thinking of paying more attention to quartz thick vein wolframite and point a new direction for tungsten polymetallic ore-search breakthrough in this area and Jiuling ore concentrating area.
引文
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[3]杨明桂,曾勇.中国东南部几个区域地质问题[A].江西省地质学会编,加强地质工作促进可持续发展——2006年华东六省一市地学科技论坛论文集[C].南昌:江西科学技术出版社,2006:1-9.
[4]林黎,占岗乐,喻晓平.江西大湖塘钨(锡)矿田地质特征及远景分析[J].资源调查与环境,2006,27(1):25-32.
[5]林黎,余忠珍,罗小洪,等.江西大湖塘钨矿田成矿预测[J].东华理工学院学报,2006,增刊:139-142.
[6]左全狮.江西九岭西段大湖塘-李扬斗成矿区成矿地质条件分析及进一步找矿前景评价[J].资源环境与工程,2006,20(61):348-353.
[7]项新葵,汪石林,詹国年,等.赣北石门寺矿区钨多金属矿床成矿地质条件初步研究[J].地质找矿论丛,2012,27(2):143-155.
[8]江西省地质矿产局.江西省区域地质志[M].北京:地质出版社,1984:1399-409.
[9]钟玉芳,马昌前,佘振兵,等.江西九岭花岗岩类复式岩基锆石SHRIMP U-Pb年代学[J].地球科学-中国地质大学学报,2005,30(6):685-691.
[10]李献华,李正祥,葛文春,等.华南新元古代花岗岩的锆石U-Pb年龄及其构造意义[J].矿物岩石地球化学通报,2001,20(4):271-273.
[11]朱焱龄,李崇佑,林运准.赣南钨矿地质[M].南昌:江西人民出版社,1981:292-310.
[12]项新葵,汪石林,詹国年,等.石门寺“一区三型”钨铜钼矿床地质特征[J].浙江国土资源,2011,增刊:60-71.
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