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Control of melt structures on Cu-An mineralization in basic-ultrabasic complexes of northern China
Yuan WM(袁万明); Yuan, WM; Mo, XX
2000
发表期刊ACTA GEOLOGICA SINICA-ENGLISH EDITION
卷号74期号:4页码:786-794
通讯作者Chinese Acad Sci, Inst High Energy Phys, Beijing 100080, Peoples R China ; China Univ Geosci, Beijing 100083, Peoples R China
摘要Based on systematic analyses of 72 samples of different basic-ultrabasic rocks, the present paper discusses the relationship between melt structure and Cu and Au mineralization. It is found that if the NBO/T, NBO, M2+, FeO and MgO values are relatively high and the T, M3+, Fe2O3, and CaO values are low the basic-ultrabasic melt will be favourable to Cu (Ni) mineralization, but if the former are low and the latter are high it is favourable to Au metallization. Cu ions occupy dominantly octahedra in basic-ultrabasic melt and the higher the NBO/T, NBO and M2+ values, the more the octahedra in the melt. Au element mainly takes the form of Aut ions in basic-ultrabasic melt and the Au+ ions constitute tetrahedral sites together with Fe3+ ions. Therefore, low M2+ and high Fe3+, i.e. high oxygen fugacity, can promote the enrichment of Au+ ions and Au mineralization. Components M+ (other than Au+), Al2O3 and SiO2 in basic-ultrabasic melt have no effect on metallogenetic species. As mentioned above, in relevant diagrams distribution areas of the characteristic values of ore-free melt and those of ore-forming melt are overlapped in different degrees, which possibly indicates that not all the magmas have mineralizing ability. It can be well distinguished whether basic-ultrabasic rocks are favourable to Cu or Au mineralization or they are just ore-free rocks by analysing integrated diagrams of the characteristic values of the magmatic melt structure.
文章类型Article
关键词melt structure Cu-Au mineralization basic-ultrabasic complex
学科领域Geology
研究领域[WOS]Geology
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语种英语
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000166691900007
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238483
专题多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Yuan WM,Yuan, WM,Mo, XX. Control of melt structures on Cu-An mineralization in basic-ultrabasic complexes of northern China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2000,74(4):786-794.
APA 袁万明,Yuan, WM,&Mo, XX.(2000).Control of melt structures on Cu-An mineralization in basic-ultrabasic complexes of northern China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,74(4),786-794.
MLA 袁万明,et al."Control of melt structures on Cu-An mineralization in basic-ultrabasic complexes of northern China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 74.4(2000):786-794.
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