| Инд. авторы: | Sokol A.G., Kruk A.N., Chebotarev D.A., Palyanov Y.N. |
| Заглавие: | Carbonatite melt-peridotite interaction at 5.5-7.0 GPa: Implications for metasomatism in lithospheric mantle |
| Библ. ссылка: | Sokol A.G., Kruk A.N., Chebotarev D.A., Palyanov Y.N. Carbonatite melt-peridotite interaction at 5.5-7.0 GPa: Implications for metasomatism in lithospheric mantle // Lithos. - 2016. - Vol.248-251. - P.66-79. - ISSN 0024-4937. - EISSN 1872-6143. |
| Идентиф-ры: | DOI: 10.1016/j.lithos.2016.01.013; РИНЦ: 27046395; SCOPUS: 2-s2.0-84960330563; WoS: 000373863900006; |
| Реферат: | eng: Interaction between carbonatite melt and peridotite is studied experimentally by melting samples of interlayered peridotite-carbonatite-peridotite in graphite containers at 1200-1350 °C and 5.5-7.0 GPa in a split-sphere multianvil apparatus. Starting compositions are lherzolite and harzburgite, as well as carbonatite which may form in the upper part of a slab or in a plume-related source. Most experimental runs were of 150 h duration in order for equilibrium to be achieved.The interaction produced carbonatitic melts with low SiO2 (≤7 wt.%) and high alkalis. At 1200 °C, melt-peridotite interaction occurs through Mg-Ca exchange, resulting in elimination of orthopyroxene and crystallization of magnesite and clinopyroxene. At 1350 °C hybridization of the carbonatite and magnesite-bearing peridotite melts occurred with consumption of clinopyroxene and magnesite, and crystallization of orthopyroxene at MgO/CaO ≥ 4.3. The resulting peridotite-saturated melt has Ca# (37-50) depending on primary carbonatite composition. Compositions of silicate phases are similar to those of high-temperature peridotite but are different from megacrysts in kimberlites. CaO and Cr2O3 changes in garnet produced from the melt-harzburgite interaction at 1200 and 1350 °C perfectly match the observed trend in garnet from metasomatized peridotite of the Siberian subcontinental lithospheric mantle. K-rich carbonatite melts equilibrated with peridotite at 5.5-7.0 GPa and 1200-1350 °C correspond to high-Mg inclusions in fibrous diamond. Carbonatite melt is a weak solvent of entrained xenoliths and therefore cannot produce kimberlitic magma if temperatures are ~1350 °C on separation from the lithospheric peridotite source and ~1000 °C on eruption. © 2016 Elsevier B.V. |
| Ключевые слова: | Mantle; Magma; Kimberlite; Experiment; Diamond formation; Metasomatism; |
| Издано: | 2016 |
| Физ. хар-ка: | с.66-79 |
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