Инд. авторы:	Agasheva E.V., Kolesnichenko M.V., Malygina E.V., Agashev A.M., Zedgenizov D.A.
Заглавие:	Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia
Библ. ссылка:	Agasheva E.V., Kolesnichenko M.V., Malygina E.V., Agashev A.M., Zedgenizov D.A. Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia // LITHOSPHERE. - 2021. - Vol.2021. - Iss. 1. - Art.7866657. - ISSN 1941-8264.
Идентиф-ры:	DOI: 10.2113/2021/7866657; РИНЦ: 46864774; РИНЦ: 46864774; WoS: 000666569500007;
Реферат:	eng: The water content in the garnet and clinopyroxene in the mantle eclogites from the V. Grib kimberlite pipe (Arkhangelsk Diamondiferous Province, NW Russia) was analysed using Fourier transform infrared spectrometry. The results show that all clinopyroxene grains contained structural water at concentrations of 39 to 247 ppm, whereas two garnet samples contained detectable water at concentrations of 211 and 337 ppm. The low-MgO eclogites with oceanic gabbro precursors contained significantly higher water concentrations in the omphacites (70-247 ppm) and whole rock (35-224 ppm) compared to those with oceanic basalt protoliths (49 73 ppm and 20-36 ppm, respectively). The incorporation of water into the clinopyroxene may be associated with vacancies at the M2 site, Al in the tetrahedral position, and the elements that filled the M2 site (mostly Na and Ca). The highest water content in the omphacite was detected in a nonmetasomatised sample and was assumed to represent residual water that survived during subduction. Other eclogite samples showed signs of modal and/or cryptic metasomatism and contained less water in the omphacites compared to the nonmetasomatised sample. The water content was heterogeneous within the eclogite section of the sampled lithospheric mantle. The lack of distinct and uniform correlations between the indices of eclogite modification and their water content indicated that the saturation with water was disturbed during their residence within the lithospheric mantle.
Ключевые слова:	H2O; GARNET; HYDROXYL; ARKHANGELSK REGION; SUBCONTINENTAL MANTLE; DIAMONDIFEROUS ECLOGITES; UDACHNAYA KIMBERLITE; NOMINALLY ANHYDROUS MINERALS; XENOLITHS; METASOMATISM;
Издано:	2021
Физ. хар-ка:	7866657
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