题名: The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions
作者: Li, Shenghu1; Li, Jiankang2; Chou, I-Ming1; Jiang, Lei1; Ding, Xin3
刊名: JOURNAL OF ASIAN EARTH SCIENCES
出版日期: 2017-04-15
卷号: 137, 期号:2017, 页码:180-193
关键词: Fractional crystallization ; Hydrothermal diamond-anvil cell ; Silicate melt inclusions ; Granite ; Yichun Ta-Nb deposit
通讯作者: Chou I-Ming(周义明)
英文摘要: The 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary
关键词[WOS]: MINIMUM WATER CONTENTS ; RARE-METAL GRANITES ; DIAMOND-ANVIL CELL ; JIANGXI PROVINCE ; EASTERN TRANSBAIKALIA ; EVOLUTION ; SYSTEM ; ENRICHMENT ; EXAMPLES ; COMPLEX
收录类别: SCI
语种: 英语
WOS记录号: WOS:000398876600008
Citation statistics:
内容类型: 期刊论文
版本: 预印本
URI标识: [http://ir.idsse.ac.cn/handle/183446/1934]  
Appears in Collections:深海科学与工程研究所_深海科学研究部_深海极端环境模拟研究实验室_期刊论文


作者单位: 1.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:
Li, S.H.,Li J.K.,Chou I-Ming,et al. The formation of the Yichun Ta-Nb deposit, China through fractional crystallization of magma indicated by fluid and silicate melt inclusions[J]. Journal of Asian Earth Science,2016,137(2017):180-193.
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