Boron isotope variations during fractional evaporation of sea water: new constraints on the marine vs. nonmarine debate
Examination of boron isotopes, elemental B, Br, and Li in brines, and coprecipitated salts during fractional evaporation of sea water shows that Br, Li, and B in the evaporated sea water have lower concentrations than expected, as determined from mass-balance calculations. The deficiency is found beyond a degree of evaporation of ~30 and is associated with a gradual increase in the δ 11 B values of the evaporated sea water, from 39‰ to 54.7‰. The boron isotope composition of sea water (δ 11 B = 39‰) is significantly higher than that of continental water (δ 11 B = -3‰ ± 5‰). Salt deposits may be depleted in 11 B by 20‰ to 30‰ relative to their parent brines. These variations suggest that boron isotopes can be used to determine the origin (marine vs. nonmarine) of brines and ancient evaporitic environments. -from Authors
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- Geochemistry & Geophysics
- 37 Earth sciences
- 04 Earth Sciences
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Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Geochemistry & Geophysics
- 37 Earth sciences
- 04 Earth Sciences