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Polychronous formation of mantle complexes in ophiolites

Citation

Savelieva, GN and Batanova, VG and Berezhnaya, NA and Presnyakov, SL and Sobolev, AV and Skublov, SG and Belousov, IA, Polychronous formation of mantle complexes in ophiolites, Geotectonics, 47, (3) pp. 167-179. ISSN 0016-8521 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Pleiades Publishing, Inc

DOI: doi:10.1134/S0016852113030060

Abstract

The paper presents new determinations of the U-Pb zircon age of high-Al chromitite from dunite of the mantle section of the Voikar-Synya massif at the Kershor site in the boundary zone with rocks of the dunite-wehrlite-clinopyroxenite complex. The high-Cr chromitite from dunite in the central part of the same massif contains zircon dated at ca. 0.6 Ga [10]. It is suggested that Paleoproterozoic (2.0-1.9 Ga) zircons from chromitites of the mantle section near the petrological Moho boundary were formed in the course of partial melting of peridotites and/or their interaction with migrating MORB-type melts. The occurrence of Vendian and Paleoproterozoic zircons in chromitites from different parts of the mantle section, as well as previously published petrological, geochemical, and geological data [2, 11, 22] allow us to suggest a complex multistage evolution of the mantle section in ophiolites. The arguments stated below show that chromitites and host dunites could have been formed at different times and were probably related to different processes. Thus, not only various complexes of the pre-Paleozoic oceanic crust reworked in the suprasubduction setting differ in age, but also the mantle rock of similar petrography, vary in the time of their formation.

Item Details

Item Type:Refereed Article
Keywords:trace-element geochemistry, U-PB age, polar-urals, voykar ophiolite, podiform chromitites
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Mineral Exploration not elsewhere classified
Author:Belousov, IA (Dr Ivan Belousov)
ID Code:87373
Year Published:2013
Web of Science® Times Cited:4
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2013-11-13
Last Modified:2017-10-24
Downloads:0

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