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| DOI | 10.1016/j.oregeorev.2020.103565 |
| Biotite geochemistry deciphers magma evolution of Sn-bearing granite, southern Myanmar | |
| Li, Jin-Xiang; Fan, Wei-Ming; Zhang, Li-Yun; Ding, Lin; Yue, Ya-Hui; Xie, Jing; Cai, Fu-Long; Quan, Qiu-Yun; Sein, Kyaing | |
| 通讯作者 | Li, JX (通讯作者) |
| 发表日期 | 2020 |
| ISSN | 0169-1368 |
| EISSN | 1872-7360 |
| 卷号 | 121 |
| 英文摘要 | Hydrothermal Sn +/- W deposits are commonly formed by ore-forming fluids that exsolved from water-saturated granitic magmas. However, the timing of fluid exsolution and its influence on volatiles and ore-forming elements still remain confused. For this purpose, geochemical and O-H isotopic compositions of biotite from Late Cretaceous-Eocene granitic intrusions in the Sibumasu terrane (southern Myanmar) are presented. MnO content of biotite is a well negative correlation with the amount of biotite and whole-rock (La/Yb)(N) ratio, indicating that it could be a good index of granitic magma differentiation. Cl content of biotite from Paleocene granite shows an increased first and subsequently decreased trend with increasing MnO content (0.71-2.36 wt%), suggesting Cl enrichment by magma evolution and depletion by late-stage fluid exsolution. Fluid exsolution is also supported reduced Li contents of biotite and O-H isotopic compositions of residual magmatic water equilibrated with highMnO biotite (delta O-18 = 7.0 to 8.8 parts per thousand and delta D = -114 to -93.5 parts per thousand). All studied biotite grains from Late Cretaceous granite have low Cl contents (0.01-0.11 wt%), decreased Li with increasing MnO contents, and residual magmatic water-like O-H isotopic values (delta O-18 = 6.9 parts per thousand and delta D = -105 parts per thousand), indicating that their host granitic melts had undergone fluid exsolution. Importantly, a positive correlation between Sn and MnO contents in biotite suggests that magma differentiation is a dominant process for Sn enrichment. No depletion of Sn by fluid exsolution likely caused by low salinity fluids exsolved from Cl-poor granitic melts, which were estimated by low Cl contents of biotite (< 0.2 wt%). The reduced Nb and Ta contents in high-MnO biotite possibly resulted by fractionation of Nb/Ta-bearing minerals during late-stage magma evolution. Moreover, ore-forming fluids equilibrated with hydrothermal muscovite from Sn-bearing quartz veins have consistent O-H isotopic compositions (delta O-18 = 6.8-7.0 parts per thousand and delta D = -61.9 to -90.2 parts per thousand) with magmatic water, suggesting that ore-forming fluids probably exsolved from more evolved granitic melts with strong Sn and F enrichment. |
| 关键词 | A-TYPE GRANITESZIRCON U-PBLA-ICP-MSTECTONIC EVOLUTIONHYDROGEN ISOTOPEHYDROTHERMAL EVOLUTIONCHINA CONSTRAINTSAQUEOUS FLUIDSOXIDE MINERALSTIN |
| 英文关键词 | Biotite; Granite; O-H isotope; Fluid exsolution; Myanmar |
| 语种 | 英语 |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:000595169900001 |
| 来源期刊 | ORE GEOLOGY REVIEWS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/259799 |
| 推荐引用方式 GB/T 7714 | Li, Jin-Xiang,Fan, Wei-Ming,Zhang, Li-Yun,et al. Biotite geochemistry deciphers magma evolution of Sn-bearing granite, southern Myanmar[J]. 中国科学院青藏高原研究所,2020,121. |
| APA | Li, Jin-Xiang.,Fan, Wei-Ming.,Zhang, Li-Yun.,Ding, Lin.,Yue, Ya-Hui.,...&Sein, Kyaing.(2020).Biotite geochemistry deciphers magma evolution of Sn-bearing granite, southern Myanmar.ORE GEOLOGY REVIEWS,121. |
| MLA | Li, Jin-Xiang,et al."Biotite geochemistry deciphers magma evolution of Sn-bearing granite, southern Myanmar".ORE GEOLOGY REVIEWS 121(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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