SiC-dominated ultra-reduced mineral assemblage in carbonatitic xenoliths from the Dalihu basalt, Inner Mongolia, China
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Abstract:
Sic and associated ultra-reduced minerals were reported in various geological settings, however, their genesis and preservation mechanism are poorly understood. Here, we reported a Sic-dominated ultra-reduced mineral assemblage, including Sic, Tic, native metals (Si, Fe, and Ni) and iron silicide, from carbonatitic xenoliths in Dalihu, Inner Mongolia. All minerals were identified in situ in polished/thin sections. Sic is 20–50 μm in size, blue to colorless in color, and usually identified in the micro-cavities within the carbonatitic xenolith. Four types of Sic polytypes were identified, which are dominated by β-SiC (3C polytype) and 4H polytype followed by 15R and 6H. These Sic are featured by 13C-depleted isotopic compositions (δ13C = –13.2 to –22.8‰, average = –17.7‰) with obvious spatial variation.Keywords:
Xenolith
Assemblage (archaeology)
Inner mongolia
Xenolith
Protolith
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