Sheared peridotite xenolith from the *** kimberlite pipe,Arkhangelsk Diamond Province,Russia:Texture,composition,and origin

作     者：Alexey Vladimirovich Kargin Lyudmila Vyacheslavovna Sazonova Anna Andreevna Nosova Vladimir Anatolievich Pervov Elena Vladimirovna Minevrina Vladimir Anatolievich Khvostikov Zhanna Petrovna Burmii 

作者机构：Institute of Geology of Ore DepositsPetrographyMineralogyand GeochemistryRussian Academy of Sciences(IGEM RAS) Lomonosov Moscow State University Departamento de Geologia.Sociedade Mineira de Catoca Institute of Technological Problems of Microelectronics and Ultrapure MaterialsRussian Academy of Sciences 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2017年第8卷第4期

页      面：653-669页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：financially supported by the Program for Development MSU supported by the Russian Foundation for Basic Research, project Nos.15-05-03778a and 16-05-00298a 

主　　题：Sheared peridotite Mantle metasomatism Kimberlite Olivine Garnet Clinopyroxene 

摘      要：The petrography and mineral composition of a mantle-derived garnet peridotite xenolith from the *** kimberlite pipe（Arkhangelsk Diamond Province,Russia） was *** on petrographic characteristics,the peridotite xenolith reflects a sheared *** sheared peridotite experienced a complex evolution with formation of three main mineral assemblages：（1） a relict harzburgite assemblage consist of olivine and orthopyroxene porphyroclasts and cores of garnet grains（Gar1） with sinusoidal rare earth elements（REE） chondrite C1 normalized patterns;（2） a neoblastic olivine and orthopyroxene assemblage;（3） the last assemblage associated with the formation of clinopyroxene and garnet marginal zones（Gar2）.Major and trace element compositions of olivine,orthopyroxene,clinopyroxene and garnet indicate that both the neoblast and clinopyroxene-Gar2 mineral assemblages were in equilibrium with a high Fe-Ti carbonate-silicate metasomatic *** nature of the metasomatic agent was estimated based on high field strength elements（HFSE） composition of olivine neoblasts,the garnet-clinopyroxene equilibrium condition and calculated by REE-composition of Gar2 and *** these evidences indicate that the agent was a high temperature carbonate-silicate melt that is geochemically linked to the formation of the protokimberlite melt.