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The paper studies accessory Cr-spinels from deep drill holes crossing the Nude-Poaz massif, which is a part of the Monchegorsk mafic-ultramafic layered complex (2.5 Ga, Kola Peninsula, Russia). Cr-spinels occur as two morphological types that differ in their chemical composition, i.e., Cr-spinels of the first type are more aluminous, while Cr-spinels of the second type are more ferruginous and titaniferous. Cr-spinels of the Nude-Poaz massif are characterized by a Fe-Ti trend known for layered intrusions in the world. Cr-spinels of the Nude-Poaz massif quite clearly differ in composition from chromites of the Sopcheozero deposit: they are more ferruginous and less chromous. The specific composition of Cr-spinels in rocks of the Nude-Poaz massif can be correlated with the sequence of the magmatic phases intrusion.
Tatiana Rundkvist; Pavel Pripachkin. Accessory Cr-Spinels in the Section of the Nude-Poaz Massif in the Monchegorsk (2.5 Ga) Mafic-Ultramafic Layered Complex (Kola Peninsula, Russia): Comparison with Ore-Forming Chromites. Minerals 2021, 11, 602 .
AMA StyleTatiana Rundkvist, Pavel Pripachkin. Accessory Cr-Spinels in the Section of the Nude-Poaz Massif in the Monchegorsk (2.5 Ga) Mafic-Ultramafic Layered Complex (Kola Peninsula, Russia): Comparison with Ore-Forming Chromites. Minerals. 2021; 11 (6):602.
Chicago/Turabian StyleTatiana Rundkvist; Pavel Pripachkin. 2021. "Accessory Cr-Spinels in the Section of the Nude-Poaz Massif in the Monchegorsk (2.5 Ga) Mafic-Ultramafic Layered Complex (Kola Peninsula, Russia): Comparison with Ore-Forming Chromites." Minerals 11, no. 6: 602.
The intermediate rocks classified as diorite-gneisses occur within the southern part of the Monchegorsk (2.5 Ga) layered mafic-ultramafic complex (Kola Peninsula, Russia). These diorite-gneisses belong to a block historically known as the diorite window (DW) block. The same rocks occur in a framing of the Monchegorsk complex. The DW block is predominantly composed of diorite-gneisses and, to a lesser degree, of amphibolites. Multi-ordinal banding, complex folding, boudinage and metamorphic transformations, garnet porphyroblasts, and tourmaline veinlets are typical of the diorite-gneisses. In accordance with the U-Pb isotope data, the age of the diorite-gneisses in the DW block is 2736.0 ± 4.6 Ma. The Sm-Nd mineral (garnet, biotite, and tourmaline) isochron for the DW rocks has yielded an age of 1806 ± 23 Ma (related to the processes of the Svecofennian orogeny). The DW diorite-gneisses are compared with the metadiorites of the Gabbro-10 massif. The latter is a part of the Monchegorsk complex, with U-Pb crystallization age of 2498 ± 6 Ma. On the basis of geological and isotope-geochemical data, it is shown that the DW rocks belong to the Archean basement while the Gabbro-10 metadiorites probably represent one of the late-magmatic phases of the Monchegorsk complex.
Pavel Pripachkin; Tatiana Rundkvist; Nikolay Groshev; Aiya Bazai; Pavel Serov. Archean Rocks of the Diorite Window Block in the Southern Framing of the Monchegorsk (2.5 Ga) Layered Mafic-Ultramafic Complex (Kola Peninsula, Russia). Minerals 2020, 10, 848 .
AMA StylePavel Pripachkin, Tatiana Rundkvist, Nikolay Groshev, Aiya Bazai, Pavel Serov. Archean Rocks of the Diorite Window Block in the Southern Framing of the Monchegorsk (2.5 Ga) Layered Mafic-Ultramafic Complex (Kola Peninsula, Russia). Minerals. 2020; 10 (10):848.
Chicago/Turabian StylePavel Pripachkin; Tatiana Rundkvist; Nikolay Groshev; Aiya Bazai; Pavel Serov. 2020. "Archean Rocks of the Diorite Window Block in the Southern Framing of the Monchegorsk (2.5 Ga) Layered Mafic-Ultramafic Complex (Kola Peninsula, Russia)." Minerals 10, no. 10: 848.
Several deposits of low-sulfide Pt–Pd ores have been discovered in recent decades in the Paleoproterozoic Fedorova–Pana Layered Complex located in the Kola Region (Murmansk Oblast) of Russia. The deposits are divided into two types: reef-style, associated with the layered central portions of intrusions, and contact-style, localized in the lower parts of intrusions near the contact with the Archean basement. The Kievey and the North Kamennik deposits represent the first ore type and are confined to the North PGE Reef located 600–800 m above the base of the West Pana Intrusion. The reef is associated with a horizon of cyclically interlayered orthopyroxenite, gabbronorite and anorthosite. The average contents of Au, Pt and Pd in the Kievey ore are 0.15, 0.53 and 3.32 ppm, respectively. The North Kamennik deposit has similar contents of noble metals. The Fedorova Tundra deposit belongs to the second ore type and has been explored in two sites in the lower part of the Fedorova intrusion. Mineralization is mainly associated mainly with taxitic or varied-textured gabbronorites, forming a matrix of intrusive breccia with fragments of barren orthopyroxenite. The ores contain an average of 0.08 ppm Au, 0.29 ppm Pt and 1.20 ppm Pd. In terms of PGE resources, the Fedorova Tundra is the largest deposit in Europe, hosting more than 300 tons of noble metals.
Nikolay Yu. Groshev; Tatyana V. Rundkvist; Bartosz T. Karykowski; Wolfgang D. Maier; Aleksey U. Korchagin; Anton N. Ivanov; Malte Junge. Low-Sulfide Platinum–Palladium Deposits of the Paleoproterozoic Fedorova–Pana Layered Complex, Kola Region, Russia. Minerals 2019, 9, 764 .
AMA StyleNikolay Yu. Groshev, Tatyana V. Rundkvist, Bartosz T. Karykowski, Wolfgang D. Maier, Aleksey U. Korchagin, Anton N. Ivanov, Malte Junge. Low-Sulfide Platinum–Palladium Deposits of the Paleoproterozoic Fedorova–Pana Layered Complex, Kola Region, Russia. Minerals. 2019; 9 (12):764.
Chicago/Turabian StyleNikolay Yu. Groshev; Tatyana V. Rundkvist; Bartosz T. Karykowski; Wolfgang D. Maier; Aleksey U. Korchagin; Anton N. Ivanov; Malte Junge. 2019. "Low-Sulfide Platinum–Palladium Deposits of the Paleoproterozoic Fedorova–Pana Layered Complex, Kola Region, Russia." Minerals 9, no. 12: 764.
The PGE-bearing Vurechuaivench massif is part of the Paleoproterozoic Monchegorsk Complex, composed of layered rock series: gabbronorite, anorthosite, and norite. Cumulative plagioclase occurs throughout Vurechuaivench massif. According to microprobe analyses, close to the sole and in the middle part of the section, cumulative plagioclase is represented by labradorite and bytownite with an anorthite component varying from An63 to An78. In the upper part of the section, plagioclase corresponds to labradorite An62 to An69. Norite of the neighboring Nud–Poaz massif contains bytownite with an anorthite component varying from An71 to An81. These data corroborate that the Vurechuaivench massif is a tectonic fragment of a larger magmatic body that involved Nud–Poaz massif. The paper presents microprobe data on plagioclase and orthopyroxene. The latter are unique to the Vurechuaivench massif, because relict fragments of pyroxene grains have not been encountered in high-grade metamorphic rocks.
T. V. Rundqvist; P. V. Pripachkin; A. V. Bazai. Plagioclase Composition in Rocks of PGE-Bearing Layered Series in the Vurechuaivench Massif, Monchegorsk Complex, Kola Region. Geology of Ore Deposits 2018, 60, 736 -743.
AMA StyleT. V. Rundqvist, P. V. Pripachkin, A. V. Bazai. Plagioclase Composition in Rocks of PGE-Bearing Layered Series in the Vurechuaivench Massif, Monchegorsk Complex, Kola Region. Geology of Ore Deposits. 2018; 60 (8):736-743.
Chicago/Turabian StyleT. V. Rundqvist; P. V. Pripachkin; A. V. Bazai. 2018. "Plagioclase Composition in Rocks of PGE-Bearing Layered Series in the Vurechuaivench Massif, Monchegorsk Complex, Kola Region." Geology of Ore Deposits 60, no. 8: 736-743.
The paper presents data on the geochemical and geochronological characteristics of zircons from mafic rocks of part of the Monchegorsk layered complex represented by the Vurechuaivench massif. Ages of zircons (SHRIMP-II) from samples V-l-09 (anorthosite) and V-2-09 (gabbronorite) are dated back to 2508 ± 7 and 2504 ± 8 Ma, respectively. The chondrite-normalized REE patterns confirm the magmatic nature of zircons. The data unequivocally indicate that the U–Pb age of zircon from both gabbronorite and anorthosite corresponds to the age of melt crystallization in a magmatic chamber. The mantle origin of gabbroic rocks of the Vurechuaivench massif is confirmed by the REE patterns of three zircon generations with different crystallization sequences. The wide range of the Ce/Ce* ratio (9.96–105.24) established for zircons from gabbroic rocks of the Vurechuaivench massif indicates sharply oxidative conditions of zircon crystallization. For deepseated mantle rocks, these data can only be explained by significant contamination of the melt with country rock material.
T. V. Rundkvist; Yu. A. Balashov; Sergey Skublov; P. V. Pripachkin; R. A. Grebnev. Geochemistry and U–Pb age of zircons from the Vurechuaivench massif, Monchegorsk complex, Kola region. Geology of Ore Deposits 2016, 58, 525 -535.
AMA StyleT. V. Rundkvist, Yu. A. Balashov, Sergey Skublov, P. V. Pripachkin, R. A. Grebnev. Geochemistry and U–Pb age of zircons from the Vurechuaivench massif, Monchegorsk complex, Kola region. Geology of Ore Deposits. 2016; 58 (7):525-535.
Chicago/Turabian StyleT. V. Rundkvist; Yu. A. Balashov; Sergey Skublov; P. V. Pripachkin; R. A. Grebnev. 2016. "Geochemistry and U–Pb age of zircons from the Vurechuaivench massif, Monchegorsk complex, Kola region." Geology of Ore Deposits 58, no. 7: 525-535.
The South Sopchinsky massif (SSM), Gabbro-10 (G-10) massif, and Moroshkovoe Lake (ML) target Monchegorsk area, Kola Peninsula, are located at the junction of the Monchepluton and Monchetundra layered intrusions. The intrusions were studied in detail as they are targets for platinum-group element (PGE) mineralization. The rocks in these targets comprise medium- to coarse-grained mesocratic to leucocratic gabbronorites, medium-grained mesocratic to melanocratic norites and pyroxenites, and various veins mainly comprising norite, plagioclase-amphibole-magnetite rocks, and quartz-magnetite rocks. The veins contain Ni-Cu-PGE mineralization associated with magnetite and chromite. In all targets, the contacts between gabbronorite and norite-pyroxenite are undulating, and the presence of magmatic (intrusive) breccias suggests that these rocks formed through mingling of two distinct magmatic pulses. In places, the gabbronorites clearly crosscut the modal layering of the norites and pyroxenites. Trace element data indicate that the gabbronorites have similar compositions to rocks of the upper part of the Monchetundra intrusion, whereas the norites and pyroxenites resemble rocks from the lower to intermediate stratigraphic levels of the Monchepluton, such as in the Nude-Poaz and Sopcha massifs. Sulfide mineralization in the studied targets principally consists of secondary bornite, millerite, and chalcopyrite. In contrast, the primary sulfide assemblage within the layered sequence of the adjacent Monchepluton is characterized by pentlandite, chalcopyrite, and pyrrhotite. Therefore, the mineralization in the studied targets is interpreted to be of a contact style. We argue that the studied area represents the contact zone between gabbronorites of the Monchetundra intrusion and norites and pyroxenites of the Monchepluton. In addition, the rocks were overprinted by postmagmatic veining and remobilization of contact style sulfide and PGE mineralization.
Pavel V. Pripachkin; Tatyana V. Rundkvist; Yana A. Miroshnikova; Alexey V. Chernyavsky; Elena S. Borisenko. Geological structure and ore mineralization of the South Sopchinsky and Gabbro-10 massifs and the Moroshkovoe Lake target, Monchegorsk area, Kola Peninsula, Russia. Mineralium Deposita 2015, 51, 973 -992.
AMA StylePavel V. Pripachkin, Tatyana V. Rundkvist, Yana A. Miroshnikova, Alexey V. Chernyavsky, Elena S. Borisenko. Geological structure and ore mineralization of the South Sopchinsky and Gabbro-10 massifs and the Moroshkovoe Lake target, Monchegorsk area, Kola Peninsula, Russia. Mineralium Deposita. 2015; 51 (8):973-992.
Chicago/Turabian StylePavel V. Pripachkin; Tatyana V. Rundkvist; Yana A. Miroshnikova; Alexey V. Chernyavsky; Elena S. Borisenko. 2015. "Geological structure and ore mineralization of the South Sopchinsky and Gabbro-10 massifs and the Moroshkovoe Lake target, Monchegorsk area, Kola Peninsula, Russia." Mineralium Deposita 51, no. 8: 973-992.
The platinum-bearing Paleoproterozoic Vurechuaivench Massif in the Monchegorsk Pluton is made up of amphibolized and saussuritized gabbronorites, anorthosites, and norites. The geochemical features of the massif rocks are considered at four detailed areas. It was confirmed that the Vurechuaivench and Nyud-Poaz massifs are geochemically similar. The rare-earth element (REE) distribution in the rocks of the Vurechuaivench Massif is peculiar in the low total REE content (9.4–27.6 ppm), negative REE slope, significant LREE enrichment [La/Yb]n = 3.7–8.7), and distinctly expressed positive Eu anomaly ([Eu/Eu*]n = 1.2–2.2). The REE distribution pattern remains unchangeable throughout the entire section, including the rocks of the Pt reef, with a gradual upsection REE increase. It is suggested that the PGE reef of the Vurechuaivench Massif, as the Platinova Reef (Skaergaard massif) and Sonju-Lake Intrusion (Duluth complex), was formed during fractional crystallization in a large magma chamber without new magma influx. It is conceivable that the Vurechuaivench Massif is the allochthonous fragment of a large loppolith-like body, the lower portions of which compose the Nyud-Poaz Massif, while the middle part was almost completely eroded.
R. A. Grebnev; T. V. Rundkvist; P. V. Pripachkin. Geochemistry of mafic rocks of the PGE-bearing Vurechuaivench Massif (Monchegorsk Complex, Kola region). Geochemistry International 2014, 52, 726 -739.
AMA StyleR. A. Grebnev, T. V. Rundkvist, P. V. Pripachkin. Geochemistry of mafic rocks of the PGE-bearing Vurechuaivench Massif (Monchegorsk Complex, Kola region). Geochemistry International. 2014; 52 (9):726-739.
Chicago/Turabian StyleR. A. Grebnev; T. V. Rundkvist; P. V. Pripachkin. 2014. "Geochemistry of mafic rocks of the PGE-bearing Vurechuaivench Massif (Monchegorsk Complex, Kola region)." Geochemistry International 52, no. 9: 726-739.