Phase Relationship between Binary Granite and Upper Muscovite Granite Lately Found at Depth in Limu Ore-Field
详细信息
- 责任者：Liang Lei (China Nonferrous Metal Guilin Geology and Mining Co. ; Guilin 541004 ; China) ; Qin Zongguang
- 刊名：Mineral Resources and Geology
- 出版年：2013
- 卷期：27(4)
- 关键词：白云母花岗岩 ; muscovite granite ; 黑云母花岗岩 ; biotite granite ; 广西 ; Guangxi Province
- 页码：p.310-316
- 图表：1 illus., 2 tables, 7 refs.
- 分类号：0801
- issnNo：ISSN1001-5663
- isbnNo：CN45-1174/TD
摘要
Binary granite,which has a thickness of more than 190m,has been found at depth in Gougualei of Limu ore-field lately by bore hole survey.Base on the petrographic analysis and comparative analysis of bina- ry granite and upper muscovite granite,this paper believes that the upper part of the granite of second phase is muscovite granite which turns to be binary granite at depth through phase transition.The muscovite gran- ite in the upper and middle part of the rock body is mainly formed by binary granite through alteration and re- placement but is not formed by gravitational separation crystallization.Its grade of alteration is as the same as that of K-feldspathization zone which locates at the lower part of mineralization alteration zone of mineral- bearing granite mass in this area.The alteration of lithofacies of Nonporphyritic muscovite granite is the strongest among K-feldspathization zone and its location is the nearest to main mineralization alteration zone.The prospecting potential is great.The chemical analysis on various lithofacies suggests that the concentrated mineralization of W,Sn,Nb and Ta may be related to magmatic liquid-gas separation or magma splitting at depth.
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