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Article

Femtosecond Laser Ablation-ICP-Mass Spectrometry and CHNS Elemental Analyzer Reveal Trace Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam

1
NAWI Graz Geocentre, University of Graz, 8010 Graz, Austria
2
Climate Geochemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
3
Department of Earth and Planetary Sciences, Macquarie University, Sydney NSW 2109, Australia
4
Géosciences Montpellier, UMR 5243, CNRS & Université Montpellier, 34095 Montpellier, France
*
Authors to whom correspondence should be addressed.
Minerals 2018, 8(6), 234; https://doi.org/10.3390/min8060234
Received: 7 May 2018 / Revised: 22 May 2018 / Accepted: 28 May 2018 / Published: 29 May 2018
(This article belongs to the Special Issue Mineralogy and Geochemistry of Gems)
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. View Full-Text
Keywords: danburite; trace elements; REE; femtosecond LA-ICP-MS; CHNS elemental analyzer; pegmatites; skarn danburite; trace elements; REE; femtosecond LA-ICP-MS; CHNS elemental analyzer; pegmatites; skarn
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MDPI and ACS Style

Huong, L.T.-T.; Otter, L.M.; Förster, M.W.; Hauzenberger, C.A.; Krenn, K.; Alard, O.; Macholdt, D.S.; Weis, U.; Stoll, B.; Jochum, K.P. Femtosecond Laser Ablation-ICP-Mass Spectrometry and CHNS Elemental Analyzer Reveal Trace Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam. Minerals 2018, 8, 234. https://doi.org/10.3390/min8060234

AMA Style

Huong LT-T, Otter LM, Förster MW, Hauzenberger CA, Krenn K, Alard O, Macholdt DS, Weis U, Stoll B, Jochum KP. Femtosecond Laser Ablation-ICP-Mass Spectrometry and CHNS Elemental Analyzer Reveal Trace Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam. Minerals. 2018; 8(6):234. https://doi.org/10.3390/min8060234

Chicago/Turabian Style

Huong, Le T.-T., Laura M. Otter, Michael W. Förster, Christoph A. Hauzenberger, Kurt Krenn, Olivier Alard, Dorothea S. Macholdt, Ulrike Weis, Brigitte Stoll, and Klaus P. Jochum. 2018. "Femtosecond Laser Ablation-ICP-Mass Spectrometry and CHNS Elemental Analyzer Reveal Trace Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam" Minerals 8, no. 6: 234. https://doi.org/10.3390/min8060234

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