Journal of Volcanology and SeismologyJournal of Volcanology and SeismologyВулканология и сейсмология0203-03063034-5138The Russian Academy of Sciences69102210.31857/S0203030625040051qficmoArticlesСтатьиResearch ArticleGabbro of the Esmeralda underwater volcano(Mariana Island Arc)Габбро подводного вулкана Эсмеральда(Марианская островная дуга)FedorovP. I.ФедоровП. И.pi_fedorov@mail.ruRashidovV. A.РашидовВ. А.rashidva@kscnet.ruAnanyevV. V.АнаньевВ. В.aversun@yandex.ruGeological Institute, Russian Academy of SciencesГеологический институт РАНInstitute of Volcanology and Seismology FEB RASИнститут вулканологии и сейсмологии ДВО РАН150720254NO4 (2025)№4 (2025)8410021092025Copyright ©; 2025, Russian Academy of SciencesCopyright ©; 2025, Российская академия наук2025Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0203-0306/article/view/691022

The mineralogical and petrochemical compositions of gabbro from the Esmeralda underwater volcano, located in the southern part of the Mariana Island Arc, dredged during the 4th and 5th cruises of the research vessel “Vulcanologist”, were studied. It has been established that gabbros belonging to the tholeiitic series are highly fractionated rocks, in contrast to the dredged gabbroids in the basins of the southern part of the Mariana Island Arc system. It is shown that gabbro is characterized by elevated iron content. The elevated iron content of rocks is confirmed by high iron content in pyroxenes and plagioclases, which allows us to classify the bulk of dredged gabbro as an association of Island Arc ferruginous tholeiites. Low concentrations of highly charged and heavy rare earth elements relative to the composition of MORB, as well as their interelement ratios, suggest the formation of primary melts from a depleted mantle source. The enrichment of gabbro with large-ion lithophile elements indicates the participation in magmogenesis of not only high-temperature sedimentary melt, but also the significant role of a low-temperature fluid component.

Исследованы минералогический и петрохимический составы габбро подводного вулкана Эсмеральда, расположенного в южной части Марианской островной дуги, драгированных в 4-м и 5-м рейсах научно-исследовательского судна “Вулканолог”. Установлено, что габбро, относящиеся к толеитовой серии, представляют собой сильно фракционированные породы, в отличие от драгированных габброидов в котловинах южной части Марианской островодужной системы. Показано, что для габбро характерны повышенные содержания железа. Повышенная железистость пород подтверждается высокими содержаниями железа в пироксенах и плагиоклазах, что позволяет отнести основную часть драгированных габбро к ассоциации островодужных железистых толеитов. Низкие концентрации высокозарядных и тяжелых редкоземельных элементов относительно состава MORB, как и их межэлементные соотношения, предполагают формирование первичных расплавов из источника обедненной мантии. Обогащение габбро крупноионными литофильными элементами свидетельствует об участии в магмогенезисе не только высокотемпературного осадочного расплава, но и о существенной роли низкотемпературного флюидного компонента.

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