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The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions
Li, Shenghu1; Li, Jiankang2; Chou, I-Ming1; Jiang, Lei1; Ding, Xin3; Chou I-Ming(周义明)
2017-04-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume137Issue:2017Pages:180-193
AbstractThe Yichun Ta-Nb deposit, which is located in Jiangxi Province, South China, can be divided into four lithological zones (from bottom upward): two-mica granite, muscovite granite, albite granite, and lepidolite-albite granite zones. It remains controversial whether these distinct vertical zones were formed through late magmatic-hydrothermal metasomatic alteration or fractional crystallization of magma. To investigate the evolution mechanism of rock-and ore-forming fluid in this deposit, we studied fluid and melt inclusions in quartz and lepidolite in these four granite zones. These fluid inclusions are mainly composed of H2O-NaCI, and have homogenization temperatures ranging from 160 C to 240 C, with densities between 0.86 and 0.94 g/cm(3) and salinities between 0.5 and 6.5 wt% NaCI equivalent. Raman spectroscopic analyses showed that the daughter minerals contained in silicate melt inclusions are mainly quartz, lepidolite, albite, muscovite, microcline, topaz, and sassolite. From the lower to upper granite zones, the albite contents in silicate melt inclusions increase, while the muscovite contents decrease gradually until muscovite is substituted by lepidolite in the lepidolite-albite granite zone. Additionally, the calculated densities of the silicate melt inclusions exhibit decreasing trends from bottom upward. The total homogenization temperatures of silicate melt inclusions, which were observed under external pressures created in the sample chamber of a hydrothermal diamond-anvil cell, decreased from 860 C in the lower lithological zone to 776 C in the upper lithological zone, and the initial melting ltemperatures of solid phases were 570-710 degrees C. The calculated initial H2O contents of granitic magma showed an increasing trend from the lower (similar to 2 wi% in the two-mica granite zone) to the upper granitic zones (similar to 3 wt% in the albite granite zone). All of these features illustrate that the vertical granite zones in the Yichun Ta-Nb deposit formed through the continuous fractional crystallization of the granitic magma. Additionally, the low H2O contents and gradual enrichment of incompatible elements (F, B, Li, Ta, Nb, etc.) in the residual granitic magma favored the formation of a granite -type Ta-Nb deposit. (C) 2016 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordFractional Crystallization Hydrothermal Diamond-anvil Cell Silicate Melt Inclusions Granite Yichun Ta-nb Deposit
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.jseaes.2016.11.016
Indexed BySCI
Language英语
WOS KeywordMINIMUM WATER CONTENTS ; RARE-METAL GRANITES ; DIAMOND-ANVIL CELL ; JIANGXI PROVINCE ; EASTERN TRANSBAIKALIA ; EVOLUTION ; SYSTEM ; ENRICHMENT ; EXAMPLES ; COMPLEX
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000398876600008
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version预印本
Identifierhttp://ir.idsse.ac.cn/handle/183446/1934
Collection深海科学研究部_深海极端环境模拟研究实验室
Corresponding AuthorChou I-Ming(周义明)
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, 28 Luhuitou Rd, Sanya 572000, Peoples R China
2.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, 26 Baiwanzhuang St, Beijing 100037, Peoples R China
3.China Univ Geosci, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Li, Shenghu,Li, Jiankang,Chou, I-Ming,et al. The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,137(2017):180-193.
APA Li, Shenghu,Li, Jiankang,Chou, I-Ming,Jiang, Lei,Ding, Xin,&Chou I-Ming.(2017).The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions.JOURNAL OF ASIAN EARTH SCIENCES,137(2017),180-193.
MLA Li, Shenghu,et al."The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions".JOURNAL OF ASIAN EARTH SCIENCES 137.2017(2017):180-193.
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