Boron isotopic composition of marine and nonmarine evaporite borates

Details Boron isotopic composition of marine and nonmarine evaporite borates Boron isotopic composition of marine and nonmarine evaporite borates

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1297s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 6, pp.1297-1301

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Here we present the results of the boron isotopic analysis of borates from some well-known marine and nonmarine evaporite deposits. Combining new analyses with analyses from the literature yields a mean 11 B value for nine marine evaporite borate analyses of 25 ± 4 permil ( 11 B / 10 B = 4.15 ± 0.02) and a mean for twenty-five nonmarine evaporite borates of -7 ± 10 permil ( 11 B / 10 B = 4.02 ± 0.04). Previous studies have shown that the boron isotopic composition of seawater ( 11 B ~ 40 permil , 11 B / 10 B ~ 4.20) is about four percent heavier than the boron isotopic composition of most crustal rocks and minerals. We suggest that our results for marine and nonmarine evaporite borates reflect this difference. Thus it should be possible to use boron isotopic composition as a tracer for boron of marine evaporitic origin. Applications include borate-bearing evaporite deposits and, perhaps, borate and/or borosilicate-bearing metamorphic rocks.

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