Abstract
The paper describes mineralogical characteristics of SiO2 inclusions in sublithospheric diamonds, which typically have complicated growth histories showing alternating episodes of growth, dissolution, and postgrowth deformation and crushing processes. Nitrogen contents in all of the crystals do not exceed 71 ppm, and nitrogen is detected exclusively as B-defects. The carbon isotope composition of the diamonds varies from δ13С = –26.5 to –6.7‰. The SiO2 inclusions occur in association with omphacitic clinopyroxenes, majoritic garnets, CaSiO3, jeffbenite, and ferropericlase. All SiO2 inclusions are coesite, which is often associated with micro-blocks of kyanite in the same inclusions. It was suggested that these phases have been produced by the retrograde dissolution of primary Al-stishovite, which is also evidenced by the significant internal stresses in the inclusions and by deformations around them. The oxygen isotope composition of SiO2 inclusions in sublithospheric diamonds (δ18O up to 12.9‰) indicates a crustal origin of the protoliths. The negative correlation between the δ18O of the SiO2 inclusions and the δ13C of their host diamonds reflects interaction processes between slab-derived melts and reduced mantle rocks at depths greater than 270 km.
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This study was carried out under government-financed project 0330-2016-0007 and was supported by the Russian Foundation for Basic Research, project no. 17-55-50062, under agreement 14.Y26.31.0018 with the Ministry of Education and Science of the Russian Federation.
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Zedgenizov, D.A., Ragozin, A.L., Kagi, H. et al. SiO2 Inclusions in Sublithospheric Diamonds. Geochem. Int. 57, 964–972 (2019). https://doi.org/10.1134/S0016702919090131
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DOI: https://doi.org/10.1134/S0016702919090131