Инд. авторы:	Simonov V.A., Prikhod'ko V.S., Vasiliev Y.R., Kotlyarov A.V.
Заглавие:	Physicochemical Conditions of Crystallization of Rocks from Ultrabasic Massifs of the Siberian Platform
Библ. ссылка:	Simonov V.A., Prikhod'ko V.S., Vasiliev Y.R., Kotlyarov A.V. Physicochemical Conditions of Crystallization of Rocks from Ultrabasic Massifs of the Siberian Platform // Russian Journal of Pacific Geology. - 2017. - Vol.11. - Iss. 6. - P.447-468. - ISSN 1819-7140. - EISSN 1819-7159.
Внешние системы:	DOI: 10.1134/S1819714017060057; WoS: 000425981800006;
Реферат:	eng: A great volume of original information on the formation of the ultrabasic rocks of the Siberian Platform has been accumulated owing to the study of melt inclusions in Cr-spinels. The inclusions show the general tendencies in the behavior of the magmatic systems during the formation of the ultrabasic massifs of the Siberian Platform, tracing the main evolution trend of decreasing Mg number with SiO2 increase in the melts with subsequent transition from picrites through picrobasalts to basalts. The compositions of the melt inclusions indicate that the crystallization conditions of the rocks of the concentrically zoned massifs (Konder, Inagli, Chad) sharply differ from those of the Guli massif. Numerical modeling using the PETROLOG and PLUTON softwares and data on the composition of inclusions in Cr-spinels yielded maximum crystallization temperatures of the olivines from the dunites of the Konder (1545-1430A degrees C), Inagli (1530-1430A degrees C), Chad (1460-1420A degrees C), and Guli (1520-1420A degrees C) massifs, and those of Cr-spinels from the Konder (1420-1380A degrees C), Inagli (up to 1430A degrees C), Chad (1430-1330A degrees C), and Guli (1410-1370A degrees C) massifs. Modeling of the Guli massif with the PLUTON software using the compositions of the melt inclusions revealed the possible formation of the alkaline rocks at the final reverse stage of the evolution of the picritic magmas (with decrease of SiO2 and alkali accumulation) after termination of olivine crystallization with temperature decrease from 1240-1230A degrees C to 1200-1090A degrees C. Modeling with the PLUTON software showed that the dunites of the Guli massif coexisted with Fe-rich (with moderate TiO2 contents) melts, the crystallization of which led (beginning from 1210A degrees C) to the formation of pyroxenes between cumulate olivine. Further temperature decrease (from 1125A degrees C) with decreasing FeO and TiO2 contents provided the formation of clinopyroxenes of pyroxenites. For the Konder massif, modeling with the PLUTON software indicates the possible formation of kosvites from picrobasaltic magmas beginning from 1350A degrees C and the formation of clinopyroxenites and olivine-diopside rocks from olivine basaltic melts from 1250A degrees C.
Ключевые слова:	DIAPIRISM; GEOCHEMISTRY; MAGMAS; RUSSIA; PROVINCE; PETROLOGY; MEIMECHITES; CR-SPINEL; MELT INCLUSIONS; Russian Far East; Siberian Platform; ultrabasic massifs; Cr-spinels; melt inclusions; physicochemical conditions; MINERALS;
Издано:	2017
Физ. характеристика:	с.447-468