E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Magmatic, Metamorphic and Geothermal Processes|
|Published online||07 June 2019|
13C-depleted moissanites in subduction-related rocks: tracers of slab fluids in the Earth’s mantle and a new diamond exploration tool
PNK GeoScience, Tampa, Florida, USA
2 Department of Geological Sciences, University of Florida, Gainesville, Florida, USA
* Corresponding author: email@example.com
A magnesian low-Ti shoshonite dike intruding Archean Norwegian Terrane includes numerous grains of black, blue and gray moissanite (SiC). Moissanite contains inclusions of native Si, Fe and Al, Fe-Cr carbides, Fe-Cr-Mn alloys and diamond. The range of observed δ13C values (-24.8 to -29.6‰) is similar to ophiolite-hosted SiC, lower mantle diamonds and slab-derived biogenic carbon. Norwegian moissanites may have been formed during interaction of Earth’s mantle with carbonaceous slab fluids under extremely reducing conditions as suggested by native metal and carbide inclusions. 13C-depleted moissanite can be used as a new exploration tool for sub-lithospheric diamonds in Archean to Phanerozoic accreted terranes and mobile belts.
© The Authors, published by EDP Sciences, 2019
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