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Cassiterite crystallization experiments in alkali carbonate aqueous solutions using a hydrothermal diamond-anvil cell

文献类型：期刊论文

作者Liu, Yongchao2; Li, Jiankang2; Chou, I-Ming1
刊名AMERICAN MINERALOGIST
出版日期2020-05-01
卷号105期号:5页码:664-673
ISSN号0003-004X
关键词Cassiterite alkali carbonate pegmatite crystallization hydrothermal diamond-anvil cell
DOI10.2138/am-2020-7118
英文摘要Ore-forming fluids enriched in alkali carbonate are commonly observed in natural melt and fluid inclusions associated with tin mineralization, particularly in granitic pegmatite. However, the roles of alkali carbonates remain unclear. Hence, to investigate the roles of alkali carbonate, herein, cassiterite (SnO2) crystallization experiments in SnO2-Li2CO3-H2O and SnO2-Na2CO3-H2O systems were conducted using a hydrothermal diamond-anvil cell. The results showed that SnO2 could dissolve into the alkali carbonate aqueous solution during heating, and long prismatic cassiterite crystals grew during the subsequent cooling stage at average rates of 0.61 x 10(-6) to 8.22 x 10(-6) cm/s in length and 3.40-19.07 mu m(3)/s in volume. The mole fraction of cassiterite crystallized from the SnO2-Li2CO3-H2O system ranges from 0.03 to 0.41 mol%, which depends on the Li2CO3 content dissolved in the aqueous solution. In situ Raman analysis of the alkali carbonate-rich aqueous solution in the sample chamber suggests that the dissolution of SnO2 can be attributed to the alkaline conditions produced by hydrolysis of alkali carbonate in which Sn(OH)(6)(2-) may be a potential tin-transporting species. The cassiterite crystallization conditions obtained in our SnO2-alkali carbonate-H2O systems primarily fell within the 400-850 degrees C and 300-850 MPa temperature and pressure ranges, respectively; furthermore, cassiterite crystallization ended in rare metal pegmatite-forming conditions. These crystallization features of cassiterite are similar to those formed in tin-mineralized granitic pegmatites. It indicates that an alkali carbonate-rich aqueous solution or hydrous melt can work as a favorable transport medium for tin and provides the necessary conditions for cassiterite crystallization in granitic pegmatite, bearing the roles in decreasing the viscosity of hydrous melts and enhancing the solubility of SnO2 in ore-forming melts or fluids. These roles of alkali carbonate can also be extended for the mineralization of other rare metals (e.g., Li and Be) in granitic pegmatite.
WOS关键词LA-ICP-MS ; INTERNAL EVOLUTION ; GRANITE-PEGMATITE ; FLUID INCLUSIONS ; RAMAN-SPECTRA ; TIN ; SOLUBILITY ; SPECIATION ; TRANSPORT ; DEPOSIT
资助项目National Key R&D program of China[2019YFC0605200] ; National Key R&D program of China[2016YFC0600208] ; National Natural Science Foundation of China[41872096] ; Chinese National Non-profit Institute Research Grant of CAGS-IMR[JYYWF201814] ; Key Frontier Science Program of Chinese Academy of Sciences[QYZDY-SSW-DQC008]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者MINERALOGICAL SOC AMER
WOS记录号WOS:000530656700007
资助机构National Key R&D program of China ; National Natural Science Foundation of China ; Chinese National Non-profit Institute Research Grant of CAGS-IMR ; Key Frontier Science Program of Chinese Academy of Sciences
源URL[http://ir.idsse.ac.cn/handle/183446/7570]  
专题深海科学研究部_深海极端环境模拟研究实验室
通讯作者Li, Jiankang
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya 572000, Hainan, Peoples R China
2.Chinese Acad Geol Sci, Inst Mineral Resources, MNR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Yongchao,Li, Jiankang,Chou, I-Ming. Cassiterite crystallization experiments in alkali carbonate aqueous solutions using a hydrothermal diamond-anvil cell[J]. AMERICAN MINERALOGIST,2020,105(5):664-673.
APA Liu, Yongchao,Li, Jiankang,&Chou, I-Ming.(2020).Cassiterite crystallization experiments in alkali carbonate aqueous solutions using a hydrothermal diamond-anvil cell.AMERICAN MINERALOGIST,105(5),664-673.
MLA Liu, Yongchao,et al."Cassiterite crystallization experiments in alkali carbonate aqueous solutions using a hydrothermal diamond-anvil cell".AMERICAN MINERALOGIST 105.5(2020):664-673.

入库方式： OAI收割

来源：深海科学与工程研究所

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