Preliminary evidence for fractionation of stable chlorine isotopes in ore-forming hydrothermal systems

Chloride from fluid inclusions in hydrothermal minerals is found to have variable and distinctive δ37Cl values spanning the range -1.1ppm to +0.8ppm. In Mississippi Valley-type deposits of Tennessee, brines of high (>0ppm) and low (near -1ppm) δ37Cl are present. High-δ37Cl brines may be saline fo...

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Bibliographic Details
Published in:Geology (Boulder) 1989-03, Vol.17 (3), p.285-288
Main Authors: Eastoe, Christopher J, Guilbert, John M, Kaufmann, Ronald S
Format: Article
Language:English
Subjects:
Arizona
Australasia
brines
Chile
chloride ion
chlorine
Cl-37/Cl-35
copper ores
Economic geology
experimental studies
fractionation
genesis
geochemical controls
Geochemistry
Geology
halogens
isotopes
lead-zinc deposits
metal ores
mineral deposits, genesis
mississippi valley-type deposits
ore-forming fluids
Papua New Guinea
porphyry copper
South America
stable isotopes
Tennessee
United States
Utah
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Summary:Chloride from fluid inclusions in hydrothermal minerals is found to have variable and distinctive δ37Cl values spanning the range -1.1ppm to +0.8ppm. In Mississippi Valley-type deposits of Tennessee, brines of high (>0ppm) and low (near -1ppm) δ37Cl are present. High-δ37Cl brines may be saline formation waters, but low-δ37Cl brines remain unexplained. In porphyry copper deposits, both high-δ37Cl (0.8ppm, 0.3ppm) and low-δ37Cl(-1.1ppm, -0.7ppm) hypersaline brines of probable magmatic origin occur. High-salinity magmatic brines with low δ37Cl values contrast isotopically with high-δ37Cl, less concentrated brines responsible for quartz-sericite-pyrite assemblages.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(1989)017<0285:PEFFOS>2.3.CO;2