Intrusion Sequence of Carbonatite Dykes and REE Accumulation Mechanism in Bayan Obo District
详细信息
- 责任者：Yang Kuifeng (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Fan Hongrui
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(5)
- 关键词：碳酸岩 ; carbonatites ; 稀土矿床 ; rare earth deposit ; 内蒙古 ; Inner Mongolia
- 页码：p.1523-1529
- 图表：illus., 2 table,s 32 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Three types of carbonatite dykes including dolomite, calcite and coexisted dolomite-calcite are distinguished by mineralogical composition in Bayan Obo rare earth element(REE) deposit district. Incision contact shows that intrusion of calcite carbonatite dykes were later than dolomite type, which indicated that carbonatite magma in Bayan Obo district had special evolution trend from dolomite through coexisted to calcite type. Moreover the content of light rare earth element(LREE) in carbonatite dykes gradually increasing with the proportion of calcite minerals from dolomite through coexisted to calcite type. Geochemical data also shows that long term crystallizational differentiation was the inner mechanism of REE(especially LREE) accumulation in the residual magma.