Rare earth elements distribution in rocks of the Ugatkin paleo caldera (Chukchi District, Russia)

Авторы: Kalko I., Bychkov D., Nikolaeva I., Prokofyev V., Sidorina Yu
Сборник: SGEM2015 Conference Proceedings
Том: 1
Год издания: 2015
Место издания: Andrey Lyapchev Sofia, Bulgaria
Первая страница: 411
Последняя страница: 418
DOI: 10.5593/SGEM2015/B11/S1.052
Аннотация: The Ugatkin paleo caldera is situated in the external zone of the Okhotsk-Chukchi volcanic belt. There are three volcanic units representing contrast volcanic rocks. The oldest unit is composed of andesitic tuff and lavas. Middle aged rocks are rhyolitic lavas and ignimbrites. Acid obsidian unit is the youngest. Subvolcanic rocks are represented by rhyolites, andesites and basalts. There are several zones with silver LS and polymetallic mineralization in the caldera. Samples were analyzed by ICP-MS and XRF. The composition of rocks is typical of calc-alkaline series formed in island arc setting. The rocks are enriched in light rare earth elements ((La/Lu)n = 2.4-11.3) that indicates homogeneity of the magmatic source. The rocks are characterized by the depletion of Eu ((Eu/Eu*)n = 0.6 – 1) which is due to incomplete melting of the source plagioclase.
Добавил в систему: Калько Ильдар Анатольевич

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