Loveringite from the marginal zone of the Monchepluton (Kola Peninsula, Russia)

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Abstract

Loveringite is found in plagioclase orthopyroxenite of the marginal zone of the NKT intrusion of the Paleoproterozoic Monchepluton (Kola Peninsula). It forms small anhedral grains in the interstices of bronzite, diopside, and plagioclase crystals where it coexists with Ti- and Cr-rich tschermakite and phlogopite, Mg-enriched ilmenite, rutile, late hydroxyl-bearing minerals (actinolite, talc, chlorite, quartz, and albite). The average composition of loveringite corresponds to the formula (Ca0.61Ce0.21La0.15)0.97(Ti12.49Fe3+2.38Fe2+2.27Cr1.28Al0.95 Zr0.84V0.45Mg0.37)21.03O38. In terms of the set of main components, it is close to loveringite from other layered mafic complexes of the world. The presence of incompatible elements (Zr, LREE, Hf, P) contained not only in loveringite but also in the associated accessory minerals (zircon, baddeleyite, monazite-(Ce), and chlorapatite), indicates contamination of rocks of marginal zone of the NKT intrusion within the Monchepluton complex with acidic crustal matter in the processes of contact interaction with the host Archean gneisses. Loveringite was formed at the late magmatic stage as a result of the fractional crystallization of the residual melt after the formation of cumulate ortho- and clinopyroxenes and intercumulus plagioclase. Crystallization of the orthocumulate occurred at a temperature of ca. 940 °C (two-pyroxene geothermometer), and crystallization of the intercumulate at a pressure of 5.2 kbar (amphibole geobarometer).

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About the authors

D. A. Orsoev

Dobretsov Geological Institute, Siberian Branch RAS

Author for correspondence.
Email: magma@ginst.ru
Russian Federation, Ulan-Ude

V. F. Smolkin

Vernadsky State Geological Museum, RAS

Email: magma@ginst.ru
Russian Federation, Moscow

E. A. Khromova

Dobretsov Geological Institute, Siberian Branch RAS

Email: magma@ginst.ru
Russian Federation, Ulan-Ude

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2. Fig. 1. The geological structure of the Monchepluton (a), section along I—I lines (б) according to (Layered…, 2004; Smolkin, Mokrushin, 2022) with additions

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3. Fig. 2. Geological section of the marginal zone of the Monchepluton along well N835 (Travyanaya Mountain, see Fig. 1a).

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4. Fig. 3. Interstitial segregations of minerals associated with loveringite in plagioclase orthopyroxenite (sample 385-253.1). BSE images

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5. Fig. 4. Morphology of segregation and association of loveringite grains in plagioclase orthopyroxenite (sample 385-253.1). BSE images

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6. Fig. 5. Chemical composition of loveringite (apfu) from Monchepluton in comparison with other layered intrusions

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