Инд. авторы:	Котляров А.В., Симонов В.А., Сафонова И.Ю.
Заглавие:	Бониниты - критерии геодинамического развития магматических систем в палеосубдукционных зонах горного алтая
Библ. ссылка:	Котляров А.В., Симонов В.А., Сафонова И.Ю. Бониниты - критерии геодинамического развития магматических систем в палеосубдукционных зонах горного алтая // Геодинамика и тектонофизика. - 2018. - Т.9. - № 1. - С.39-58. - EISSN 2078-502X.
Идентиф-ры:	DOI: 10.5800/GT-2018-9-1-0336.; РИНЦ: 35369221;
Реферат:	eng: Ancient primary boninitic melts of the Gorny Altai (65-105 km, 1410-1590 °C) were studied from the composition of melt inclusions in clinopyroxenes. We estimated their parameters and the conditions for the onset of magma crystallization in an intermediate chamber at a depth of about 30-35 km, which appear similar to the reference boninitic magmatism of the modern Izu-Bonin island arc. A combined analysis of the composition of inclusions and clinopyroxenes from Gorny Altai boninites shows that within a range of minimum temperature values (1140-1120 °C), the crystallizing material continuously ascends from a depth of 12 to 0.6 km. The pattern is different in case of higher-temperature magmas, and three zones of pyroxene crystallization are distinguished: 18.0-13.8 km (1245-1205 °С), 12.0-3.5 km (1240-1185 °С), and 3.3-0.6 km (1185-1145 °С). Actually, these zones correspond to the intermediate deep-seated magmatic chambers typical of modern island-arc subduction zones [ Dobretsov et al., 2016 ]. Based on the detailed study of zonal phenocrysts of clinopyroxene in boninites from the Kuray ophiolites, we established the parameters of the evolution of the ascending boninite melts. Three temperature intervals (1220-1200 °С, 1235-1210 °С, and 1120-1220 °С) and three pressure ranges (1.5-11.5 kbar, 2.0-6.0 kbar, and 2.0-0.3 kbar) are distinguished. One case shows a significant pressure drop (from 11.5 to 1.5 kbar) with a small drop in temperature (from 1220 °C to 1200 °C). In the second case, the pressure rises from 2.0 to 6.0 kbar, and the crystallization temperature decreases from 1235 to 1210°C. In the third case, crystallization begins at a stable temperature (1120-1140 °C) and a stable pressure (1.4-2.0 kbar); then, in the near-surface conditions, the temperature increases to 1220 °C, and the pressure decreases sharply to 0.3 kbar. rus: На основе данных по составу расплавных включений в клинопироксенах установлены параметры генерации древних первичных бонинитовых расплавов Горного Алтая (65-105 км, 1410-1590 °С), а также определены условия начала кристаллизации этих магм в промежуточной камере на глубине около 30-35 км, совпадающие с данными по эталонному бонинитовому магматизму современной Идзу-Бонинской островной дуги. Совместное использование состава включений и клинопироксенов из бонинитов Горного Алтая показало, что в одном случае при минимальных температурах (1140-1120 °С) происходил непрерывный подъем кристаллизующейся массы с глубины от 12 до 0.6 км. Для более высокотемпературных магм характерен другой путь - с выделением трех зон кристаллизации пироксенов на глубине 18.0-13.8 км (1245-1205 °С), 12.0-3.5 км (1240-1185 °С) и 3.3-0.6 км (1185-1145 °С), фактически соответствующих промежуточным разноглубинным магматическим камерам, характерным для современных островодужных зон субдукции [ Dobretsov et al., 2016 ]. В результате детальных исследований зональных вкрапленников клинопироксена из бонинитов Курайских офиолитов были установлены параметры эволюции двигающихся вверх бонинитовых расплавов. Выделяются три температурных интервала (1220-1200 °С, 1235-1210 °С и 1120-1220 °С) и три диапазона давлений (1.5-11.5 кбар, 2-6 кбар и 2.0-0.3 кбар). В одном случае установлено существенное падение давления от 11.5 до 1.5 кбар при незначительном снижении температуры от 1220 °С до 1200 °С. В другом случае идет повышение давления от 2 до 6 кбар и снижение температуры кристаллизации от 1235 до 1210 °С. В третьем случае в начале для процессов кристаллизации характерны устойчивые значения температур (1120-1140 °С) и давлений (1.4-2.0 кбар), далее в приповерхностных условиях происходит рост температуры до 1220 °С с резким падением давления до 0.3 кбар.
Ключевые слова:	расплавные включения; зона субдукции; магматическая система; геодинамический процесс; PT-conditions; melt inclusions; Subduction zone; magmatic system; geodynamic process; клинопироксены; бониниты; clinopyroxene; boninite; PT-условия;
Издано:	2018
Физ. хар-ка:	с.39-58
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