Compositional variation and Sn isotope fractionation of cassiterite during magmatic-hydrothermal processes

被引:27
|
作者
Wu, Jinghua [1 ,2 ]
Li, Huan [1 ]
Mathur, Ryan [3 ]
Bouvier, Audrey [4 ]
Powell, Wayne [5 ,6 ]
Yonezu, Kotaro [2 ]
Zhu, Dapeng [1 ]
机构
[1] Cent South Univ, Sch Geosci & Info Phys, Key Lab Metallogen Predict Nonferrous Met & Geol E, Minist Educ, Changsha 410083, Peoples R China
[2] Kyushu Univ, Fac Engn, Dept Earth Resources Engn, Fukuoka 8190395, Japan
[3] Juniata Coll, Dept Geol, Huntingdon, PA 16652 USA
[4] Univ Bayreuth, Bayer Geoinst, D-95447 Bayreuth, Germany
[5] Brooklyn Coll, Dept Earth & Environm Sci, Brooklyn, NY 11210 USA
[6] CUNY, Grad Ctr, Earth & Environm Sci, New York, NY 10016 USA
基金
中国国家自然科学基金;
关键词
kinetic fractionation; fractionation factor; partition coefficients; Sn isotope reservoirs; Xianghualing deposit; NB-TA MINERALIZATION; SOUTH CHINA; TRACE-ELEMENTS; TIN ISOTOPES; GEOCHRONOLOGY; GEOCHEMISTRY; CONSTRAINTS; DEPOSIT; CRYSTALLIZATION; CHONDRITES;
D O I
10.1016/j.epsl.2023.118186
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Cassiterite (SnO2) precipitates over a wide physicochemical range during magmatic-hydrothermal processes. Significant variations in chemical and Sn isotopic compositions of cassiterite have been increasingly reported from hydrothermal deposits worldwide. However, the mechanisms responsible for such notable changes in cassiterite geochemistry remain to be fully addressed. Toward this end, we investigated the chemical and Sn isotopic compositions of distinct generations of cassiterite from a highly-evolved magmatic-hydrothermal-metallogenic system (Xianghualing Sn polymetallic deposit, South China). Cassiterite is widespread in the albite granite, greisen, skarn, and sulfide ore of this deposit, covering most of the known cassiterite-bearing rock/ore types. Based on distinct morphologies and mineral paragenesis, three generations of the Xianghualing cassiterite are identified: (1) Cst 1 occurs in albite granite and greisen; (2) Cst 2 occurs in skarn; and (3) Cst 3 is present in sulfide ore. A lattice strain model indicates that inter-element compositional differences of cassiterite are dual-controlled by cassiterite element partition coefficients and melt/fluid compositions for sufficient and deficient elements, respectively. The variations in Zr, Hf, Nb, and Ta elements in cassiterite are recognized as thermo-indicators of the melt/fluid physicochemical conditions. Their concentrations are influenced by pre-and syn-precipitated Zr-Hf-Nb-Ta-enriched minerals that have a wide crystallization temperature range. Due to differentiations of multiple cationic valences, concentrations and interelement ratios of Sb, Fe, V, and U can be utilized to monitor the relative melt/fluid redox state of different cassiterite generations. Tin stable isotopic compositions are notably fractionated in the Xianghualing cassiterite samples, with delta amuSn values relative to standard NIST 3161a ranging from-0.16%o to 0.19%0. By comparison with compiled Sn isotopes of other hydrothermal deposits, kinetic disequilibrium fractionation is proposed as the main control on cassiterite Sn isotopes fractionation. A Rayleigh fractionation model generates fractionation factors of 1.00010-1.00025, consistent with fractionation factors predicted by first principles calculations (1.00013 to 1.00037). Thus, progressive precipitation of Sn-enriched minerals due to the change of physicochemical conditions during magmatic-hydrothermal processes will cause lighter Sn isotopic compositions in residual melt/fluid. This study highlights that cassiterite chemical and Sn stable isotopes are novel indicators to magmatic-hydrothermal processes.(c) 2023 Elsevier B.V. All rights reserved.
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页数:14
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