Mineralization Relevant to Repeated Crustal Melting: Taking the ZCGB, Gansu Province as an Example
详细信息
- 责任者：Li Hongwei (Department of Earth Sciences ; Sun Yat-Sen University ; Guangzhou 510275 ; China) ; Lou Feng
- 刊名：Earth Science Frontiers
- 出版年：2011
- 卷期：18(1)
- 关键词：深熔作用 ; anatexis ; 成矿作用 ; metallogenesis ; 甘肃 ; Gansu Province
- 页码：p.126-132
- 图表：5 illus., 2 tables, 40 refs.
- 分类号：1000
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
On the basis of the in-situ melting model of granite genesis, the authors re-encoded the geological, geochemical and mineralogical data concerning the Zhongchuan composite granite body (ZCGB) and found that the ZCGB was formed by repeated crustal melting in the earlier Mesozoic. According to the NNE fracture system developed within the ZCGB and the remnants of hydrothermal activity within the fractures, a remelting event was very likely to occur in Late Cretaceous to Early Cenozoic in the lower part of the Early Mesozoic granite layer. Repeated melting would increase oxygen fugacity f(O2) of magma system, leading U4+ to change into U6+ that would be not able to enter the lattice of silicates and thus be expelled out of the magma system during the hydrothermal stage, forming the "granite-type" uranium veins within the fracture in the old covering granite layers.
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