Platinum-rhenium-osmium isotope systematics of chromitite and native osmium from the Guli Massif (Maimecha-Kotui Province, Russia)

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Abstract

To gain insight into the source of ore material, this study presents the first Re-Os and Pt-Os isotopic and highly siderophile element (HSE) abundance data for chromitite and osmium minerals from the Guli massif of ultramafic, alkaline rocks and carbonatites located in the Maimecha-Kotui province, Polar Siberia. The study utilized a number of analytical techniques, including electron microprobe analysis, negative thermal ionization mass spectrometry (N-TIMS) and high pressure asher digestion and an isotope dilution-inductively coupled plasma-mass spectrometry. The HSE concentrations in chromitite samples range from 191 to 866 ppb with a predominance of Ir-group platinum-group elements (PGE) (Os, Ir and Ru) over Pt-group PGE (Rh, Pt and Pd) and Re, which is consistent with their platinum-group mineral control (i. e., Os-Ir alloys and laurite, RuS2) within the chromitite. The Re-Os and Pt-Os isotope data indicate that the HSE budget of the chromitite and osmium minerals from the Guli massif was largely controlled by that of the mantle source, which evolved with long-term near-chondritic Re/Os and Pt/Os ratios; this source is within the range of those for the majority of komatiite and abyssal peridotite sources.

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About the authors

K. N. Malitch

Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: dunite@yandex.ru
Russian Federation, Ekaterinburg

I. S. Puchtel

University of Maryland

Email: ipuchtel@umd.edu
United States, College Park, MD20742

L. N. Kogarko

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: kogarko@geokhi.ru

Academician of the RAS

Russian Federation, Moscow

I. Yu. Badanina

Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: dunite@yandex.ru
Russian Federation, Ekaterinburg

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2. Fig. 1. Morphological features: (a) veined chromitite (model G-40) of the Gulinsky massif, (b, c) crystals of native osmium from quaternary deposits (models 7-71 and 67, respectively) of the Gulinsky massif. Images in backscattered electrons (BSE) with real contrast (b, c).

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3. Fig. 2. Diagram of variations of (a) initial 187Os/188Os isotopic compositions expressed in values of γ187Os(T) and (b) initial 186Os/188Os isotopic compositions expressed in values of 186Os(T) for chromitite, osmium minerals of the Gulinsky massif, MPG Kunar complex and Precambrian komaiite arrays, relative to their age. Data on komatiites according to [9], on MPG of the Kunar complex according to [8]. The blue vertical stripe for the modern Gross Silicate Earth (Bulk Silicate Earth: BSE) according to [4] for (a) and according to [7] for (b). Os-isotopic data for abyssal Peridotite (Abyssal Peridotite: AP) are taken from [3, 7], for chondrite meteorites – from [6, 19, 20]; the latter are represented as a segment enclosed between two purple converging inclined lines and correspond to their full range of variations of modern values of the values of γ187Os projected in time to the primary ratio 187Os/188Os for the Solar System. All errors correspond to 2SD of the average value.

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