Lu-Hf isotope composition of zircon from syenites of the Sakharjok alkaline massif, Kola Peninsula

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Abstract

This study examines zircon from the alkaline and nepheline syenites of the Sakharjok massif magmatic (2.645 ± 7 Ma), hydrothermal (1.832 ± 7 Ma) and metamorphic (1.784 ± 22 Ma) stages. Zircon from the alkaline syenites shows lower ɛHf and ɛNd values compared to that from ocean island basalts (OIB) suggesting their mantle-derived prololiths, are close to the CHUR in terms of isotopic composition. It is assumed that the formation of the Neoarchean alkaline Keivy province resulted from the plume-lithospheric interaction triggered by the uplift of a Neoarchean plume that stipulated the processes of metasomatic alterations and subsequent partial melting of the subcratonic lithospheric mantle and crustal rocks. The initial melts of the Sakharjok massif could probably form during the reactivation of the plume activity that occurred 20—30 million years after the emplacement of alkaline granites of the province by selective melting of the metasomatized lithospheric mantle rocks.

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About the authors

Valeriy R. Vetrin

Kola Science Center of the RAS; Institute of Mineralogy, Geochemistry and Crystalochemistry of Rare Elements of the RAS

Author for correspondence.
Email: vetrin.val@gmail.com
SPIN-code: 3512-4033

Dr. Ph., leading sci. researcher, Geological Institute

Russian Federation, 14 Fersman St. Apatity Murmansk region 184209 Russia; 15 Veresayev St. Moscow 121357 Russia

Elena A. Belousova

Macquarie University

Email: elena.belousova@mq.edu.au

Dr. Sci, Professor, Dept. of Earth and Planetary Sciences, Faculty of Science 

Australia, NSW 2109, Sydney, Australia

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2. Fig. 1. Geological scheme of the Sakharjok deposit (after: Multimedia Reference Book…, 2001, with simplifications).

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3. Fig. 2. Zircon crystals from alkaline and nepheline syenites. CL images. Circles are locations of the ionic probe beam. Their numbers corresponds to number of analyses in Table.

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4. Fig. 3. Lu-Hf isotope diagrams for zircon from syenites of the Sakharjok deposit.

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5. Fig. 4. Hf-Nd isotope diagram for zircon from syenites of the Sakharjok deposit.

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