Helium Isotope Composition and 4He/20Ne Ratio in Pyrite and Magnetite of Explosive Carbonatite Breccias of the Sallan-Latva Massif, Kola Region

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Abstract

We studied the isotopic composition and helium and neon ratios of fluid inclusions in magnetite and pyrite from carbonatite breccias of the Sallanlatva alkaline-ultrabasic complex using the stepcrushing method. The results indicate a high probability that fluids from several sources, captured in different proportions, were involved in the formation of the Sallanlatva explosive carbonatite breccias. The R/Ra ratio (R is the measured 3He/4He ratio, and Ra = 1.382 x 10-6 is the same ratio in atmospheric air) reaches a value of 2.3, which is a reliable indicator of mantle gas involvement. The low (1 to 44) value of the 4He/20Ne ratio suggests the contribution of atmospheric gases dissolved in paleometeoric waters. The combination of these two facts supports the hypothesis of the phreatomagmatic nature of the studied breccias, i.e. their formation due to the interaction of infiltrated high-temperature orthomagmatic fluid with meteoric waters transporting dissolved atmospheric gases.

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About the authors

E. N. Kozlov

Geological Institute of the Kola Science Centre of the Russian Academy of Sciences

Author for correspondence.
Email: kozlov_e.n@mail.ru
Russian Federation, Apatity

E. N. Fomina

Geological Institute of the Kola Science Centre of the Russian Academy of Sciences

Email: kozlov_e.n@mail.ru
Russian Federation, Apatity

M. Yu. Sidorov

Geological Institute of the Kola Science Centre of the Russian Academy of Sciences

Email: kozlov_e.n@mail.ru
Russian Federation, Apatity

A. V. Gudkov

Geological Institute of the Kola Science Centre of the Russian Academy of Sciences

Email: kozlov_e.n@mail.ru
Russian Federation, Apatity

V. V. Kolobov

Northern Energetics Research Centre of the Kola Science Centre of the Russian Academy of Sciences

Email: kozlov_e.n@mail.ru
Russian Federation, Apatity

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2. Fig. 1. (a) Comparison of the R/Ra ratio in the bulk gas extracted during crushing with the U + 0.24Th content (ppm) determined in the powder remaining after crushing. (b) Histogram showing the relationship between the frequency of occurrence of certain values of R/Ra ratio as a function of 3He content for minerals and bulk samples of carbonatites (coloured areas of bars) and their complementary rocks (empty areas) from the SCP complexes according to data from [3]. Comparison of (c) 3He concentration with 4He/3He isotopic ratio and (d) R/Ra and 4He/20Ne ratios in fluids extracted by stepwise crushing from pyrite and magnetite of explosive carbonatite breccias of the Sallanlatva massif. Notation: 1 - first crushing stage (up to 100 blows), 2 - second crushing stage (from 100 to 200 blows), 3 - third crushing stage (from 200 to 1000 blows), 4 - magnetite (Mag), 5 - pyrite (Py). Figure (c) shows the mixing line, plotted using data from [8], between the substance of the Kola plume [3] and radiogenic helium formed in situ in the mineral. In Figure (d), the colour of the symbols corresponds to the studied sample (red - 186.0 m, blue - 187.6 m, green - 229.5 m), and the arrows reflect the sequence of crushing steps from the first to the third. Figure (d) also shows the mixing lines between air-saturated water, crust, and upper mantle ([1, 16] and references therein), as well as the isotopic characteristics of atmospheric air [17]

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