NEWLY DISCOVERED DAXIYINGZI Rb-Be DEPOSIT IN THE EASTERN SECTION OF THE NORTHERN MARGIN OF NORTH CHINA CRATON
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摘要:
辽宁省阜新市大喜营子矿床是华北克拉通北缘新发现的铷铍稀有金属矿床, 属花岗伟晶岩型矿床, 主要由黑云母花岗岩、钠长石花岗岩和天河石花岗伟晶岩组成. 含Rb和Be的主要矿石矿物为天河石和绿柱石, 赋存于天河石花岗伟晶岩中. 该矿床的成矿年龄为223 Ma左右. 地球化学特征表明该花岗岩为高分异I型花岗岩, 来源于中新元古界基底的高温部分熔融, 并有幔源岩浆注入. 大喜营子铷-铍矿床是形成于造山带背景下的过铝岩浆多金属矿床, 该矿的发现为华北克拉通北缘的找矿提供了新的方向.
Abstract:The Daxiyingzi Rb-Be deposit in Fuxin City of Liaoning Province is newly discovered in the northern margin of North China Craton, belonging to the granite-pegmatite type rare metal deposit, mainly composed of biotite granite, albite granite and amazonite granite pegmatite. The ore minerals containing Rb and Be are mainly amazonite and beryl, which are hosted in amazonite granite pegmatite. The metallogenic age of the deposit is about 223 Ma. The geochemical characteristics indicate that the granite is of highly fractioned I-type, which originated from the high-temperature partial melting of Meso-Neoproterozoic basement, with injection of mantle-derived magma. The peraluminous magmatic polymetallic deposit was formed in the orogenic belt setting. Its discovery provides a new direction for mineral exploration in the northern margin of North China Craton.
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Key words:
- Daxiyingzi Rb-Be deposit /
- amazonite /
- beryl /
- highly fractionated granite /
- North China Craton /
- Liaoning Province
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