An experimental study of tin partition between melt and aqueous fluid in F/Cl-coexisting magma

Hu, Xiaoyan; Bi, Xian‐Wu; Shang, Liang; Hu, Ruizhong; Cai, Guanqiang; Chen, You‐Wei

doi:10.1007/s11434-009-0008-7

Cited by 15 publications

(2 citation statements)

References 59 publications

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“…Very few experimental data exist to assess whether Sn may have efficiently degassed from mafic magmas, as the available studies are restricted to S-free and predominantly chlorideor fluoride-bearing felsic systems (Keppler and Wyllie, 1991;Duc-Tin et al, 2007;Hu et al, 2008Hu et al, , 2009. These studies reported D Sn fluid/melt in the range of 0 to 10, with generally increasing values with increasing Cl concentration, which was consistent with the data obtained from coexisting natural fluid and melt inclusions (Zajacz et al, 2008).…”

Section: The Role Of CL and S In The Solubility And Transportation Of Metalssupporting

confidence: 72%

Vapor Transport and Deposition of Cu-Sn-Co-Ag Alloys in Vesicles in Mafic Volcanic Rocks

Hunter

Zajacz

et al. 2020

Economic Geology

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Metallic sublimates coated by sulfides and chlorides line the vesicle walls of mafic volcanic lava and bombs from Kīlauea, Vesuvius, Etna, and Stromboli. The metallic sublimates were morphologically and compositionally similar among the volcanoes. The highest concentrations of S and Cl occurred on the surface of the sublimates, while internally they had less than 1 wt % S and Cl in most cases, leading us to classify them as alloys. The major components of the alloys were Cu, Sn, Co, and Ag based on electron microprobe analyses and environmental scanning electron microscope element maps. Alloy element maps showed a covariance of Cu-Sn, while Co and Ag concentrations varied independently. Laser ablation-inductively coupled plasma-mass spectrometry analysis of matrix glass and melt inclusions in bombs from Stromboli showed appreciable amounts of Cu, Co, and Sn. We propose a model for the origin of the metallic grains, which involves syneruptive and posteruptive magma degassing and subsequent cooling of the basalt vesicles. During syneruptive vapor phase exsolution, volatile metals (Cu, Co, and Sn) partition into the vapor along with their ligands, S and Cl. The apparent oxygen fugacity (fO2) in these vapor bubbles is low because of the relative enrichment of the exsolved gas phase in H2 relative to H2O in silicate melts, due to the much higher diffusivity of the former in silicate melts. The high fH2 and low fO2 induces the precipitation of metal alloys from the vapor phase. Subsequently, the reducing environment in the vesicle dissipates as the cooling vapor oxidizes and as H2 diffuses away. Then, metal-rich sulfides (and chlorides) condense onto the outer surfaces of the metal alloy grains either due to a decrease in temperature or an increase in fO2. These alloys provide important insights into the partitioning of metals into a magmatic volatile phase at low pressure and high temperature.

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Section: The Role Of CL and S In The Solubility And Transportation Of Metalssupporting

confidence: 72%

Vapor Transport and Deposition of Cu-Sn-Co-Ag Alloys in Vesicles in Mafic Volcanic Rocks

Hunter

Zajacz

et al. 2020

Economic Geology

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“…No fluorite has been found in the vein dikes, implying a low F content in the parent magma. Experimental results show that granitic melts with high F content could extract and enrich Sn and W in the melt [80,81], and the partition coefficient of tin between aqueous and silicate melt would increase significantly when the F content in the melt were below 1 wt.% [80]; therefore, the decrease in F and increase in Cl content is favorable to the partition of Sn and W into aqueous fluid [80,81]. High salinity fluid inclusion hosted in hydrothermal quartz indicates a higher Cl in the water-rich melt; thus, the immiscibility between low F, waterrich, and water-poor silicate melts may lead to Sn and W enrichment in the water-rich melt.…”

Section: Fluid Exsolution From the Melt And Characteristics Of The Pr...mentioning

confidence: 99%

The Mechanism of Fluid Exsolution and Sn–W Precipitation: Example from the Hongling Pb–Zn Polymetallic Deposit and the Surrounding Area in Northern China

Shan,

Xie,

et al. 2023

Minerals

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Metal migration and precipitation in hydrothermal fluids are important topics in economic geology. The Hongling polymetallic deposit comprises one of the most important parts of the Huanggangliang–Ganzhuermiao polymetallic metallogenic belt, which is in eastern Inner Mongolia. Except for lead–zinc skarn, minor cassiterite in the skarn and disseminated W–Sn mineralization in granitic rocks have also been found. The dominant Sn–W mineralization is in the northern part of the deposit, occurring as disseminated wolframite and cassiterite in aplite hosted in Mesozoic granite porphyry. The aplite together with pegmatite K-feldspar–quartz comprises vein dikes hosted in the granite porphyry, providing evidence for the transition from melt to fluid. The veins, dikes, and Sn–W mineralization in the aplite provide an opportunity to investigate fluid exsolution and the mechanics of metal precipitation. Based on field observations, the micrographic and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) results of the vein dikes, chronology, and the whole-rock geochemistry of the host rock, together with the fluid inclusion results, this paper discusses the characteristics of the causative magma, the mechanics of fluid exsolution and W–Sn precipitation. Our results show that the causative magma is of highly fractionated A-type granite affinity and has an intrusive age of late Mesozoic (133.3 ± 0.86 Ma). The magmatic evolution during shallow emplacement led to immiscibility between highly volatile, high-silica, and W- and Sn-enriched melts from the parent magma, followed by fluid exsolution from the water-rich melt. The alkaline-rich fluid exsolution led to a change in the redox state of the magma and the chilling of the melt. Fluid boiling occurred soon after the fluid exsolution and was accompanied by the degassing of CO2. The boiling and escape of CO2 from the fluid led to changes in fluid redox and W and Sn precipitation; thus, the W and Sn mineralization are mostly hosted in causative intrusions or peripheral wall rocks, which can be used as indicators for Sn–W exploration in the area.

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Tracing the evolution and distribution of F and Cl in plutonic systems from volatile-bearing minerals: a case study from the Liujiawa pluton (Dabie orogen, China)

Zhang

Holtz

et al. 2012

Contrib Mineral Petrol

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An experimental study of tin partition between melt and aqueous fluid in F/Cl-coexisting magma

Cited by 15 publications

References 59 publications

Vapor Transport and Deposition of Cu-Sn-Co-Ag Alloys in Vesicles in Mafic Volcanic Rocks

Vapor Transport and Deposition of Cu-Sn-Co-Ag Alloys in Vesicles in Mafic Volcanic Rocks

The Mechanism of Fluid Exsolution and Sn–W Precipitation: Example from the Hongling Pb–Zn Polymetallic Deposit and the Surrounding Area in Northern China

Tracing the evolution and distribution of F and Cl in plutonic systems from volatile-bearing minerals: a case study from the Liujiawa pluton (Dabie orogen, China)

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