Deposition conditions for the indium-bearing polymetallic quartz veins at Sarvlaxviken, south-eastern Finland
Autor: | M. Valkama, A. Villar, Krister Sundblad, Curt Broman |
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Rok vydání: | 2018 |
Předmět: |
010504 meteorology & atmospheric sciences
Cassiterite ta1171 Geochemistry Mineralogy engineering.material 010502 geochemistry & geophysics 01 natural sciences Fluorite Hydrothermal circulation Geochemistry and Petrology Batholith engineering Fluid inclusions Inclusion (mineral) Vein (geology) Quartz Geology 0105 earth and related environmental sciences |
Zdroj: | Mineralogical Magazine. 82:S43-S59 |
ISSN: | 1471-8022 0026-461X |
DOI: | 10.1180/minmag.2017.081.024 |
Popis: | Polymetallic quartz veins, with up to 1500 ppm indium, have been discovered recently in the Sarvlaxviken area within the 1.64 Ga anorogenic multiphase Wiborg rapakivi batholith and adjacent 1.90 Ga Svecofennian crust in SE Finland. Evidence from primary fluid inclusions in the Sarvlaxviken area provides new information on the hydrothermal transport and depositional processes of metals in anorogenic granites. Fluid inclusions with variable aqueous liquid and vapour proportions (5–90 vol.% vapour) occur in quartz, cassiterite and fluorite belonging to three generations of polymetallic quartz veins. Microthermometry indicates that the veins were deposited at temperatures that range from ~500°C down to 2-F-Cl-S and metals. Fluid inclusions with low salinities dominate, but higher salinities are recorded in metal-rich parts of the veins. The turbulent fluid flow, with complex geometry and temperature-salinity patterns, may explain why sulfide and/or oxide opaque minerals occur irregularly, and are locally the dominating vein minerals, but disappear completely into barren parts of the quartz veins. All fluids are considered to have been generated by the F-rich Marviken granite (and related granite dykes), which show all geochemical criteria for an ore-fertile granite. The quartz veins investigated in the adjacent Svecofennian country rocks are considered to represent the very last stage of a fluid with similar characteristics to the fluid responsible for the ore formation in the Sarvlaxviken area, but that had cooled to |
Databáze: | OpenAIRE |
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