中国地质2009，Vol.36Issue(5)：1110-1122,13.
华北板块北缘首例大型高品位隐伏斑岩型金矿床——内蒙古毕力赫金矿
The Bilihei gold deposit in Inner Mongolia: the first large-sized high-grade concealed porphyry Au deposit discovered on the northern margin of North China plate
摘要
Abstract
The Bilihei gold deposit(No.II ore zone) in Inner Mongolia,found by Gold Geological Institute of CAPF in 2006-2008,is one of the fatal breakthrough deposits supported by the Project of Supersedable Resource Prospecting of Critical Mines in China.It is located in the Mesozoic(Jurassic) continental facies volcanic basin on the northern margin of North China plate.The main characteristics of the deposit are as follows:(1) the concealed ore body occurs in the contact zone(mainly in the inner-contact zone) between granodiorite porphyry and volcanic rocks;(2) a large ore body 500m long,300m wide and averagely 52.85m thick was identified,which contains 21916 kg Au at the average grade of 4.5×10~(-6)(the highest grade being 54.76×10~(-6));(3) ores can be classified into altered granodiorite porphyry type and andesite porphyrite type,with the former type having typical unidirectional solidification texture(UST).There are only small amounts(<1%) of metallic minerals,such as pyrite,chalcopyrite and molybdenite,in the ore;gold mainly occurs in lumpy or veinlet quartz formed during alteration;(4) just like gold-rich porphyry copper deposits,the alteration shows obvious ring-shaped zoning;the concentric alteration zones from the inner part outwards and from early to late stages are successively the K-silicate zone,the quartz-sericite zone,and the propylitic zone;the structure-controlled argillic alteration locally occurs as patches,superimposed by other alteration zones;(5) the early ore-forming stage has very high temperature(>550℃),and the temperature of the middle-late stage is 108～375℃,194℃ on average.It is concluded that this deposit is a large-sized and high-grade independent and concealed porphyry Au deposit and is the first deposit of this kind discovered on the northern margin of North China plate.关键词
金矿床/大型/高品位/斑岩型/华北板块北缘/毕力赫/内蒙古Key words
gold deposit/ large size/ high-grade/ porphyry type/ northern margin of North China plate/ Bilihei/ Inner Mongolia分类
天文与地球科学引用本文复制引用
葛良胜,卿敏,张文钊,袁士松,段希刚,马满福,庞继尧,唐明国..华北板块北缘首例大型高品位隐伏斑岩型金矿床——内蒙古毕力赫金矿[J].中国地质,2009,36(5):1110-1122,13.基金项目
全国危机矿山接替资源勘查项目(200715011)和第二批全国危机矿山典型矿床及成矿规律总结研究项目(20089925)资助. （200715011）
