ГеохимияГеохимия0016-7525The Russian Academy of Sciences1617710.31857/S0016-7525649948-957Research ArticleThe inclusions of SiO2 in sublithospheric diamondsZedgenizovD. A.zed@igm.nsc.ruRagozinA. L.zed@igm.nsc.ruKagiH.zed@igm.nsc.ruYurimotoH.<p>Department of Natural History Sciences</p>zed@igm.nsc.ruShatskyV. S.zed@igm.nsc.ruSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesNovosibirsk State UniversityGeochemical Research Center (GRC), Graduate School of Science, the Tokyo UniversityHokkaido University200920196499489572009201920092019Copyright © 2019, Russian Academy of Sciences2019<p>The specific features of the mineralogy of SiO<sub>2</sub> inclusions in sublithospheric diamonds are described in this study. Such diamonds are characterized by a complex growth history with stages of growth and dissolution and postgrowth processes of deformation and crushing. The nitrogen content in all studied crystals does not exceed 71 ppm and nitrogen is detected only as B-defects. The carbon isotope composition of diamonds varies widely from -26.5 to -6.7 of <sup>13</sup>С. SiO<sub>2</sub> inclusions associate with omphacitic clinopyroxenes, majoritic garnets, CaSiO<sub>3</sub>, jeffbenite and ferropericlase. All SiO<sub>2</sub> inclusions are coesite, which is often accompanied by micro-blocks of kyanite. These phases are suggested to represent the product of the retrograde transformation of the primary Al-stishovite. Significant internal stresses in the inclusions and deformations around them can be evidence of thise phase transformation. The heavier oxygen isotope composition of SiO<sub>2</sub> inclusions in sublithospheric diamonds (up to 12.9 <sup>18</sup>O) indicates the crustal origin of their protoliths. The observed anti-correlation of <sup>18</sup>O of SiO<sub>2</sub> inclusions and <sup>13</sup>C of their host diamonds reflects the processes of interaction of slab-derived melts with reduced mantle rocks at depths above 270 km.</p>diamondsinclusionsstishovitecoesitesublithospheric mantlesubductioncarbonoxygenалмазвключениястишовиткоэситсублитосферная мантиясубдукцияуглеродкислород[Зедгенизов Д., Рагозин А., Калинина В., Каги Х. (2016) Особенности минералогии кальциевых включений в сублитосферных алмазах. Геохимия (10), 919-930.][Zedgenizov D.A., Ragozin A.L., Kalinina V.V., H. Kagi (2016) The Mineralogy of ca-rich inclusions in sublithospheric diamonds. Geochem. Int. 54 (10), 890-900.][Зедгенизов Д., Шацкий В., Панин А., Евтушенко О., Рагозин А., Каги Х. (2015) Свидетельства фазовых переходов минеральных включений в сверхглубинных алмазах из месторождения Сао-Луис (Бразилия). Геология и геофизика 56, 384-396.][Литвин Ю.А., Спивак А.В., Кузюра А.В. 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