KIMBERLITE MELTS RICH IN ALKALI CHLORIDES AND CARBONATES: A POTENT METASOMATIC AGENT IN THE MANTLE
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dc.contributor.author | Kamenetsky M.B. | |
dc.contributor.author | Sobolev A.V. | |
dc.contributor.author | Kamenetsky V.S. | |
dc.contributor.author | Danyushevsky L.V. | |
dc.contributor.author | Maas R. | |
dc.contributor.author | Thomas R. | |
dc.contributor.author | Pokhilenko N.P. | |
dc.contributor.author | Sobolev N.V. | |
dc.date.accessioned | 2022-03-24T08:31:06Z | |
dc.date.available | 2022-03-24T08:31:06Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13458439 | |
dc.identifier.citation | Geology, 2004, 32, 10, 845-848 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36590 | |
dc.description.abstract | Kimberlite magmas, as the deepest probe into Earth's mantle (>150 km), can supply unique information about volatile components (hydrogen, carbon, chlorine, sulfur) in mantle-derived melts and fluids. All known kimberlite rocks are not suitable for studies of mantle volatiles because of their pervasive postmagmatic alteration; however, this study discusses an exceptionally fresh group I kimberlites (<0.5 wt% H 2O) from the Udachnaya-East diamondiferous pipe in Siberia. Kimberlite groundmass, in addition to euhedral olivine and calcite, is extremely enriched (at least 8 wt%) in water-soluble alkali chlorides, alkali carbonates, and sulfates (ratio 5:3:1), and often shows immiscibility textures. A primary magmatic origin of alkali chlorides and alkali carbonates is confirmed by the study of strontium isotopes in the water- and dilute acid-leachates of the groundmass ( 87Sr/86Sr = 0.7069 and 0.7050) that contrast with much more radiogenic isotope composition of the Cambrian platform sedimentary rocks and the Udachnaya-East mine-site brines. Melt inclusions in groundmass olivine, composed of halite, sylvite, alkali-Ca carbonates, phlogopite, olivine, and CO2 fluid, were used to determine the composition and evolution of the kimberlite melt prior to emplacement. Melt inclusions show immiscibility between chloride and carbonate liquids at <600 °C in heating stage experiments. The chloride and carbonate enrichment in the kimberlite parental magma suggests the presence of a powerful agent for chemical modifications (metasomatism) in the mantle and crust. | |
dc.title | KIMBERLITE MELTS RICH IN ALKALI CHLORIDES AND CARBONATES: A POTENT METASOMATIC AGENT IN THE MANTLE | |
dc.type | Статья |
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