RB-SR EVIDENCE FOR THE GENETIC LINKS BETWEEN BIOTITE AND LI-F GRANITES: AN EXAMPLE OF THE SPOKOINOE, ORLOVKA, AND ETYKA DEPOSITS, EASTERN TRANSBAIKALIA
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dc.contributor.author | Kostitsyn Yu.A. | |
dc.contributor.author | Zaraiskii G.P. | |
dc.contributor.author | Aksyuk A.M. | |
dc.contributor.author | Chevychelov V.Yu. | |
dc.date.accessioned | 2022-07-20T06:12:21Z | |
dc.date.available | 2022-07-20T06:12:21Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13458521 | |
dc.identifier.citation | Geochemistry International, 2004, 42, 9, 822-829 | |
dc.identifier.issn | 0016-7029 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38315 | |
dc.description.abstract | As was determined by the Rb-Sr method, the barren biotite granite of the Oldanda and Khangilai plutons, the rare-metal granites at the Spokoinoe, Orlovka, and Etyka deposits and the Ary-Bulak ongonite in eastern Transbaikalia were formed at 142.1 ± 0.6 Ma. The same age and initial Sr isotopic ratio (0.7067 ± 2) of these granites confidently show their genetic links, i.e., their relations to a common magmatic process. A combination of the relatively low initial Sr isotope ratio with the extremely high Rb/Sr ratio of the rare-metal granites indicates that the rare-metal melt could exist for no longer than 10 4-105 yr. This indicates that plausible models for the origin of the rare-metal granite should not involve any long-term processes giving rise to a high Rb/Sr ratio of the parental melt, as well as the melting of a source close in composition to the rare-metal granites themselves. Generation of the rare-metal melt was most likely caused by the highly advanced fractionation of a common granitic melt. The simultaneous formation of the granitic plutons hundreds of kilometers apart suggests a common deep-seated source of energy controlling the process. The melting of the crustal rocks could be controlled by a mantle-derived melt emplaced at lower crustal levels. | |
dc.title | RB-SR EVIDENCE FOR THE GENETIC LINKS BETWEEN BIOTITE AND LI-F GRANITES: AN EXAMPLE OF THE SPOKOINOE, ORLOVKA, AND ETYKA DEPOSITS, EASTERN TRANSBAIKALIA | |
dc.type | Статья |
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