DBPapers
DOI: 10.5593/SGEM2015/B11/S1.052

RARE EARTH ELEMENTS DISTRIBUTION IN ROCKS OF THE UGATKIN PALEO CALDERA (CHUKCHI DISTRICT, RUSSIA)

I. Kalko, D. Bychkov, I. Nikolaeva, V. Prokofyev, Y. Sidorina
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 411-418 pp

ABSTRACT
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.

Keywords: Rare earth elements, volcanic belt, Chukchi Peninsula

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