Journal article
The Dovyren intrusive complex (northern Baikal region, Russia): Isotope-geochemical markers of contamination of parental magmas and extreme enrichment of the source
AA Ariskin, LV Danyushevsky, EG Konnikov, R Maas, YA Kostitsyn, A McNeill, S Meffre, GS Nikolaev, EV Kislov
Russian Geology and Geophysics | RUSSIAN ACAD SCIENCES, SIBERIAN BRANCH, VS SOBOLEV INST GEOL & MINEROL | Published : 2015
Abstract
The Dovyren intrusive complex includes the ore-bearing (Cu-Ni-PGE) Yoko-Dovyren layered pluton (728 Ma, up to 3.4 km in thickness), underlying ultramafic sills, and comagmatic leuconorite and gabbro-diabase dikes. Studies of Sr-Nd-Pb isotope systems were carried out for 24 intrusive rocks and five associated low- and high-Ti basalts. The high-Ti basalts show 0.7028 ≤ (87Sr/86Sr)T ≤ 0.7048 and 4.6 ≤ εNd(T) ≤ 5.8, similar to the values in MORB. The intrusive basic and ultrabasic rocks are geochemically similar to the low-Ti formation, making a compact cluster of compositions with extremely high ratios of radiogenic Sr and Pb isotopes and low εNd values. The maximum enrichment in radiogenic Sr ..
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Awarded by University of Tasmania
Funding Acknowledgements
The study was supported by Anglo-American, BHP Billiton, and Votorantim Metais through the grant P962 AMIRA International funding to ARC Centre of Excellence in Ore Deposits, University of Tasmania (CODES, Hobart, Australia) (2007-2010) as well as by the Australian National Research Council and the Russian Foundation for Basic Research (grants no. 08-05-00194, 11-05-00268, 11-05-00062, and 14-05-00216a).