Boron isotopic composition of tourmaline from massive sulfide deposits and tourmalinites

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Authors:Palmer, M. R.; Slack, J. F.
Author Affiliations:Primary:
Mass. Inst. Technol., Atmos. and Planet. Sci., Cambridge, MA 02139, United States
U. S. Geological Survey, United States
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 103(4), p.434-451. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1989
Note:In English. 160 refs.; 6 tables
Summary:Boron isotope ratios (11B/10B) were measured on 60 tourmaline separates from over 40 massive sulphide deposits and tourmalinites from a variety of geological and tectonic settings. The coverage of these localities is global (five continents) and includes the giant orebodies at Kidd Creek and Sullivan (Canada), Broken Hill (Australia), and Ducktown (USA). Overall, the tourmalines display a wide range in 11B values from -22.8 to +18.3permil. Possible controls over the boron isotopic composition of the tourmalines include: 1) composition of the B source; 2) regional metamorphism; 3) water/rock ratios; 4) sea-water entrainment; 5) T of formation, and 6) secular variations in sea- water delta11B. The most significant control appears to be the composition of the B source, particularly the nature of footwall lithologies; variations in water/rock ratios and sea- water entrainment are of secondary importance. The B isotope values seem especially sensitive to the presence of evaporites (marine and non-marine) and carbonates in source rocks to the massive sulphide deposits and tourmalinites. [Authors' abstract] [P.Br.]
Subjects:B-11/B-10; Boron; Geochemistry; Global; Isotopes; Massive deposits; Massive sulfide deposits; Metamorphic rocks; Minerals; Provenance; Ring silicates; Schists; Silicates; Stable isotopes; Sulfides; Tourmaline group; Tourmalinite
Abstract Numbers:90M/3086
Record ID:1993039360
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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