Isotope (δ18О, δ13С, δD) characteristics of biotite-carbonate-quartz associations of hydrothermal veins in metabasites of North Karelia

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Abstract

On the White sea islands and coast of North Karelia, in the Loukhi region, carbonate-silicate and quartz veins are widespread, confined to bodies of Early Proterozoic metabasites and their contacts with host gneisses. The isotopic characteristics of coarsely crystalline vein carbonates (δ18O and δ13C), as well as associated quartz (δ18O) and biotite (δ18O and δD), were studied. The isotopic composition of oxygen suggests biotite-quartz-carbonate equilibria during the formation of veins at temperatures of 520–450°C. The O and H isotopic characteristics of biotite correspond to the equilibrium of the fluid with metamorphic rocks. At the same time, the isotopic compositions of O and C carbonates indicate different sources of CO2 in fluids. There are three groups of carbonates according to δ18О and δ13С. The first group has “magmatic” isotopic characteristics of the CO2 source (δ18ОVSMOW = 7.1… 12.1‰; δ13СVPDB= = –6.3…–4.5‰). Carbonates of the second group have high δ18О and δ13С, characteristic of Precambrian sedimentary carbonates (δ18ОVSMOW = 21.9…24.7‰; δ13СVPDB = –2.2…-2‰), similar to those described earlier in the neighboring Engozero sector of the Belomorian mobile belt. In the third group, the δ13С values are similar to the carbonates of the first group, and δ18О – to the second group (δ13СVPDB= = –1.7…0.9‰, δ18ОVSMOW = 6…12‰). The O and C isotopic compositions of carbonates of the third group can be obtained from the action of a putative magmatic fluid on both the primary sedimentary source of metamorphic fluids and redeposited vein carbonates.

About the authors

I. S. Volkov

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Author for correspondence.
Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

E. O. Dubinina

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru

Corresponding Member of the RAS

Russian Federation, Moscow

S. A. Kossova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

Y. N. Chizhova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

Y. O. Larionova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

V. M. Kozlovskii

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

A. N. Pertsev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: ivanvolkov19@yandex.ru
Russian Federation, Moscow

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