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    Boron isotopes in tourmaline as a tracer of metasomatic processes in the Bamble sector of Southern Norway

    Access Status
    Fulltext not available
    Authors
    Bast, R.
    Scherer, E.
    Mezger, K.
    Austrheim, H.
    Ludwig, T.
    Marschall, H.
    Putnis, Andrew
    Lowen, K.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Bast, R. and Scherer, E. and Mezger, K. and Austrheim, H. and Ludwig, T. and Marschall, H. and Putnis, A. et al. 2014. Boron isotopes in tourmaline as a tracer of metasomatic processes in the Bamble sector of Southern Norway. Contributions to Mineralogy and Petrology. 168 (1069): pp. 1-21.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-014-1069-4
    ISSN
    0010-7999
    URI
    http://hdl.handle.net/20.500.11937/35594
    Collection
    • Curtin Research Publications
    Abstract

    The Bamble sector of southern Norway comprises metagabbros and metasediments that were metasomatically altered to various extents during a late stage of the Sveconorwegian orogeny (~1.06 Ga). The infiltration of highly saline brines along veins led to penetrative scapolitizationand albitization on a regional scale and the local deposition of Fe–Ti oxides. Typical secondary mineralassemblages include either scapolite + apatite + amphibole + phlogopite + tourmaline, or albite + epidote + calcite + chlorite + white mica, indicating that the fluids introduced large amounts of Na, Cl, Mg, Ca, K, P, and B to the system. Metasomatic tourmalines associated with different alteration stages as identified by variations in majorelement composition and initial 87Sr/86Sr were analyzedfor B isotopic compositions to constrain possible sources and the evolution of the hydrothermal fluid(s). Measured d11B values range from -5 to +27 ‰ relative to SRM-951, suggesting marine evaporites interlayered with various amounts of continental detritus and pelagic clay as a possible B source reservoir. The influence of a seawater-derived component is clearly indicated by the heavy B isotope signature of tourmaline related to Al–Mg-rich metapelites. In contrast, negative d11B values can be explained by the influence of pneumatolytic fluids associated with granitic pegmatites. On a regional scale (i.e., several km), d11B values in tourmaline vary widely, whereas variations within a single outcrop (tens of m) are typically small and can be ascribed to different generations of tourmaline related to several fluid pulses.

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