Isotopic age and heterogeneous sources of gabbro‒anorthosites from the Patchemvarek massif, Kola Peninsula

Lithium in pegmatites of the Fennoscandian Shield and operation prospects for the Kolmozero deposit on the Kola Peninsula (Russia)

“…The crystallisation age of zircon from gabbro-anorthosites of the Patchemvarek and Northern massifs determined using the U-Pb, TIMS technique, is 2925 ± 7 Ma and 2935 ± 8 Ma (Kudryashov and Mokrushin 2011). Alternative geochronological studies (Vrevsky and Lvov 2014, 2016) made using the SHRIMP (U-Pb) technique have obtained an isotopic age of 2661.8 ± 7.1 Ma for the zircons from gabbro-anorthosites of the Patchemvarek massif and suggested that older zircons dated as c.2.9 Ga are the xenocrysts that was introduced to the mafic melt from the older country rocks. These results (Vrevsky and Lvov 2014, 2016) suggesting a younger age of metagabbro-anorthosites compared to the country rocks accords well with findings of the xenoliths of migmitised tonalite-trondhjemite gneisses and rocks from the greenstone complex in the north-eastern and south- western margin of the Patchemvarek massif (Evenchik, S.I, 1959, unpublished data).…”

“…Alternative geochronological studies (Vrevsky and Lvov 2014, 2016) made using the SHRIMP (U-Pb) technique have obtained an isotopic age of 2661.8 ± 7.1 Ma for the zircons from gabbro-anorthosites of the Patchemvarek massif and suggested that older zircons dated as c.2.9 Ga are the xenocrysts that was introduced to the mafic melt from the older country rocks. These results (Vrevsky and Lvov 2014, 2016) suggesting a younger age of metagabbro-anorthosites compared to the country rocks accords well with findings of the xenoliths of migmitised tonalite-trondhjemite gneisses and rocks from the greenstone complex in the north-eastern and south- western margin of the Patchemvarek massif (Evenchik, S.I, 1959, unpublished data). The contact zone of metagabbro-anorthosites and tonalite-trondhjemites gneisses of the Murmansk block is marked by a metasomatite alteration forming halo of the chlorite and holmquistite schists (Gordienko 1970).…”

Distribution of Trace Elements in K-Feldspar with Implications for Tracing Ore-Forming Processes in Pegmatites: Examples from the World-Class Kolmozero Lithium Deposit, NW Russia

“…The Kolmozero pegmatite field occurs in the tonalite-trondhjemite gneisses of the Murmansk province, which were intruded by the Kolmozero massif at about 2.73 Ga (metagabbrodiorites, metamonzodiorites, and metagranodiorites) [22] and by the meta- The Kolmozero pegmatite field occurs in the tonalite-trondhjemite gneisses of the Murmansk province, which were intruded by the Kolmozero massif at about 2.73 Ga (metagabbrodiorites, metamonzodiorites, and metagranodiorites) [22] and by the metagabbroanorthosite massifs of Severny, Bezymyanny and Patchemvarek at about 2.66 Ga [23]. The albite-spodumene pegmatites were emplaced into the Patchemvarek massif at 2.315 +/−0.01 Ga [24].…”

Spodumene from rare-metal pegmatites of the Kolmozero lithium world-class deposit on the Fennoscandian shield: trace elements and crystal-rich fluid inclusions

“…The Kolmozero pegmatite field is entirely within the Murmansk province (Figs 1, 2; Gordienko, 1970). This pegmatite field occurs in Archaean tonalite–trondhjemite gneisses that are intruded by the Kolmozero massif of metagabbrodiorites, metamonzodiorites and metagranodiorites of sanukitoid affinities of 2.73 Ga (Kudryashov et al , 2013) and gabbro–anorthosites of the Patchemvarek massif of 2.66 Ga (Vrevsky and Lvov, 2016) and its two satellites, the Severny and Bezymyanny massifs.…”