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Alakit and Daldyn kimberlite fields,siberia,Russia:Two types of mantle sub-terranes beneath central Yakutia?

Geoscience Frontiers 2017年第4期8卷 671-692页

作者： i.V.Ashchepkov A.M.Logvinova T.Ntaflos N.V.Vladykin s.i.Kostrovitsky Z.spetsius s.i.mityukhin s.A.Prokopyev N.s.Medvedev H.Downes institute of Geology and Mineralogy sD RAs institute of Geochemistry sD RAs Dept.of Lithospheric Research University of Vienna Alrosa stock Company Nikolaev institute of inorganic Chemistry 3 Department of Earth and Planetary sciences Birkbeck University of London

Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric *** occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn *** the Alakit ***-diopsides are alkaline,and stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions,while in the Daldyn field harzburgitic pyropes are *** eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions,while in the Daldyn field they show varying compositions and often continuous Pressure-Temperature（P-T） ranges with increasing Fe~# with decreasing *** Alakit,Crpargasites to richterites were found in all pipes,while in Daldyn,pargasites are rare Dalnyaya and Zarnitsa ***-diopsides from the Alakit region show higher levels of light Rare Earth Elements（LREE）and stronger REE-slopes,and enrichment in light Rare Earth Elements（LREE）,sometimes Th-U,and small troughs in *** the Daldyn field,the High Field strength Elements HFsE troughs are more common in clinopyroxenes with low REE abundances,while those from sheared and refertilized peridotites have smooth *** from Alakit show HREE minima,but those from Daldyn often have a trough at Yand high U and ***/O2 diagrams from both regions show similarities,suggesting similar layering and *** degree of metasomatism is often higher for pipes which show dispersion in P-Fe~# trends for *** the mantle beneath Udachnaya and Aykhal,pipes show 6-7 linear arrays of P-Fe~# in the lower part of the mantle section at 7.5-3.0 GPa,probably reflecting primary subduction *** the sytykanskaya pipe,there are several horizons with opposite inclinations which reflect metasomatic *** high dispersion of the P—Fe~# trend indicating widespread metasomatism is associated with decreased diamond *** explanation of the differences in miner

关键词： Thermobarometry Geochemistry Daldyn Alakit Craton Lithosphere

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