RESP  > 地球快报-2018年第10期
DOI: 10.1016/j.gca.2017.10.011
篇名:
Formation of hydrothermal tin deposits: Raman spectroscopic evidence for an important role of aqueous Sn(IV) species
作者: Schmidt, Christian
通讯作者: Schmidt, C (reprint author), GFZ German Res Ctr Geosci, Sect 4-3, D-14473 Potsdam, Germany.
发表期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN: 0016-7037
EISSN: 1872-9533
出版年: 2018
卷: 220, 页码:499-511
发表日期: 2018
语种: 英语
领域: 地球科学 ; 资源环境 ; 气候变化
英文摘要: The speciation of tin and the solubility of cassiterite in H2O + HCl were determined at temperatures to 600 degrees C using in situ Raman spectroscopy. In addition, information on the fluid-melt partition of Sn was obtained at 700 degrees C and indicated a preference of the fluid only at HCl concentrations that are much higher than in fluids exsolved from natural felsic melts. Dissolution of cassiterite generally resulted in formation of Sn(IV) species unless reduced conditions were generated by hydrogen permeation or carbohydrates in the starting material. The prevalent aqueous Sn(IV) species was [SnCl4(H2O)(2)](0), with additional [SnCl3(H2O)(3)](+) and [SnCl5(H2O)](-). The only detectable Sn(II) species was very likely [Sn(II)Cl-3](-). Cassiterite solubility increased with HCl concentration and was generally high in H2O+HCl fluids, with no strong dependencies on temperature, pressure, or the oxidation state of tin in the fluid. The Sn( IV) concentrations at 500 and 600 degrees C determined from the integrated v(1)[Sn(IV)-Cl] band intensity are in good agreement with literature data on the cassiterite solubility in H2O + HCl at oxygen fugacities along the hematite-magnetite buffer. The combined results from previous experimental studies and this study demonstrate that HCl molality is a crucial parameter for hydrothermal mobilization and transport of tin and for cassiterite precipitation, and that pH, pressure and temperature are less important. Current models on hydrothermal tin deposit formation need to be augmented to include Sn(IV)-Cl complexes as significant tin-transporting species. Irrespective of the oxidation state of tin in the fluid, cassiterite precipitates due to reaction of the hydrothermal fluid with the wall rock (greisen or skarn formation), dilution (mixing with meteoric water) or a decrease in the HCl activity in the aqueous liquid by boiling. A redox reaction is only required for tin transported as Sn( II) to be converted to Sn(IV). (C) 2017 Elsevier Ltd. All rights reserved.
英文关键词: Tin ; Solubility ; Speciation ; Hydrothermal fluids ; Raman spectroscopy
收录类别: SCI-E
WOS记录号: WOS:000416502300029
WOS关键词: 600 DEGREES-C ; LA-ICP-MS ; FLUID INCLUSIONS ; TUNGSTEN DEPOSITS ; HIGH-TEMPERATURES ; HIGH-PRESSURES ; SILICATE MELT ; SPECIATION ; SYSTEMS ; CASSITERITE
WOS学科: Geochemistry & Geophysics
WOS研究方向: Geochemistry & Geophysics
Citation statistics:
被引频次[WOS]:1   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
条目标识符: http://119.78.100.173/handle/2MONF3CL/87300
Appears in Collections:地球快报-2018年第10期

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Recommended Citation:
Schmidt, Christian. Formation of hydrothermal tin deposits: Raman spectroscopic evidence for an important role of aqueous Sn(IV) species[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,220:499-511.
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