Femtosecond laser ablation-ICP-mass spectrometry and CHNS elemental analyzer reveal trace element characteristics of Danburite from Mexico, Tanzania, and Vietnam

Le Thi-Thu Huong, Laura M. Otter, Michael W. Förster, Christoph A. Hauzenberger, Kurt Krenn, Olivier Alard, Dorothea S. Macholdt, Ulrike Weis, Brigitte Stoll, Klaus Peter Jochum

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    6 Citations (Scopus)
    9 Downloads (Pure)

    Abstract

    Danburite is a calcium borosilicate that forms within the transition zones of metacarbonates and pegmatites as a late magmatic accessory mineral. We present here trace element contents obtained by femtosecond laser ablation-inductively coupled plasma (ICP)-mass spectrometry for danburite from Mexico, Tanzania, and Vietnam. The Tanzanian and Vietnamese samples show high concentrations of rare earth elements (∑REEs 1900 µg∙g−1 and 1100 µg∙g−1, respectively), whereas Mexican samples are depleted in REEs (<1.1 µg∙g−1). Other traces include Al, Sr, and Be, with Al and Sr dominating in Mexican samples (325 and 1611 µg∙g−1, respectively). Volatile elements, analyzed using a CHNS elemental analyzer, reach <3000 µg∙g−1. Sr and Al are incorporated following Ca2+ = Sr2+ and 2 B3+ + 3 O2− = Al3+ + 3 OH + □ (vacancy). REEs replace Ca2+ with a coupled substitution of B3+ by Be2+. Cerium is assumed to be present as Ce4+ in Tanzanian samples based on the observed Be/REE molar ratio of 1.5:1 following 2 Ca2+ + 3 B3+ = Ce4+ + REE3+ + 3 Be2+. In Vietnamese samples, Ce is present as Ce3+ seen in a Be/REE molar ratio of 1:1, indicating a substitution of Ca2+ + B3+ = REE3+ + Be2+. Our results imply that the trace elements of danburite reflect different involvement of metacarbonates and pegmatites among the different locations.

    Original languageEnglish
    Article number234
    Pages (from-to)1-15
    Number of pages15
    JournalMinerals
    Volume8
    Issue number6
    DOIs
    Publication statusPublished - Jun 2018

    Bibliographical note

    Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • danburite
    • trace elements
    • REE
    • femtosecond LA-ICP-MS
    • CHNS elemental analyzer
    • pegmatites
    • skarn

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