摘要
新帐房云英岩型钼矿产出在大兴安岭北段地区,属古亚洲洋成矿域、蒙古—鄂霍茨克洋构造域与古太平洋成矿域的叠合部位。海拉尔—新帐房断裂活动对于区域范围内侏罗纪成矿花岗岩侵位具有控制作用,细粒花岗岩内普遍发育云英岩化现象且矿化强度与云英岩化程度呈正相关。矿体均产于侏罗纪花岗岩内,呈北西向展布,透镜状产出,总体走向为145°,倾角为80°,平均品位0.22%,长约120m。辉钼矿为主要的硫化物,其次为黄铁矿、磁黄铁矿等。云英岩化花岗岩呈"右倾"型稀土元素配分模式并富集Nb、Ta、Zr、Hf等高场强元素,亏损大离子亲石元素。黄铁矿、辉钼矿等硫化物的S、Pb同位素分析结果显示,新帐房钼矿的硫同位素主要来自地球深部;Pb同位素反映成矿岩体为成矿提供了主要物质来源,同样具深部来源特征。研究结果认为新帐房钼矿具有典型云英岩型矿床地质特征,在大兴安岭北段地区有一定的找矿意义。
Distributed in the coincide position of Paleo-Asia Ocean, Mongol Okhotsk Ocean and Paleo-Pacific Ocean metallogenesis region, the northern Greater Khingan Mountains contained quantities of Mo deposits including Xinzhangfang Molybdenum Deposit. Detailed fieldwork reveals the Jurassic granite is controlled by the Hailar- Xinzhangfang fault and greisenization of the granites is positive correlated with mineralization of molybdenum. Both molybdenum mineralization and ore bodies distributed NW, inner Jurassic granite. Lens, with an average tenor of 0.22%, stretch over 120 m, had a strike of 145° and inclination of 80°. Molybdenite is the most important sulfides in the deposit, lesser pyrite and pyrrhotite also distributed. The granite enriched high field strength elements such as Nb.Ta.Zr. Hf and deleted large ion lithophile elements. S and Pb isotope test results of sulfides from the deposit show S element mainly from inner earth and Pb element, which is mainly derived from Jurassic granite, also from deep earth. Due to this research, the Xinzhangfang Molybdenum Deposit had typical geological features of greisenrelated type deposit and had prospecting meanings in the northern region of the Greater Khingan Mountains.
出处
《有色金属（矿山部分）》
2016年第5期17-23,共7页
NONFERROUS METALS(Mining Section）
基金
中国地质调查项目(12120113055600)
关键词
地质特征
花岗岩地球化学
S、Pb同位素
云英岩型钼矿
大兴安岭北段
geological features
granite geochemical features
S and Pb isotopes contents
greisen-related type deposit
the northern Greater Khingan Mountains
