East Scandinavian and Noril’sk plume mafic large igneous provinces of Pd-Pt ores: Geological and metallogenic comparison

Mitrofanov, F. P.; Bayanova, T. B.; Korchagin, Aleksey; Groshev, N. Yu.; Malitch, K. N.; Zhirov, Dmitry; Mitrofanov, A. F.

doi:10.1134/s107570151305005x

Cited by 37 publications

(20 citation statements)

References 15 publications

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“…Three drill cores (26,29,30) intersecting the Main Anorthosite Layer were used for this study (JSC Pana, 2012-2013. A detailed overview of the petrography and mineral chemistry of the Main Anorthosite Layer is given in [9,11,12,26].…”

Section: Methodsmentioning

confidence: 99%

“…It is generally believed that the formation of PGE mineralization in most Russian Paleoproterozoic layered intrusions is related to the long duration of magmatism associated with prolonged igneous activity in response to a long-lived mantle plume affecting the Kola Craton for more than 50 Ma, which is mainly based on ID-TIMS U-Pb age dating [13,14]. This interpretation is generally at odds with the current paradigm of relatively short-lived mantle plume magmatism and the duration of cooling of basaltic magma chambers, such as the Bushveld Complex, which crystallized in less than 1 Ma [15].…”

Section: Geological Settingmentioning

confidence: 99%

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The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

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The West-Pana intrusion belongs to the Paleoproterozoic Fedorova-Pana Complex of the Kola Region in NW Russia, which represents one of Europe's most significant layered complexes in terms of total platinum group element (PGE) endowment. Numerous studies on the age of the West-Pana intrusion have been carried out in the past; however, all published U-Pb isotope ages were determined using multi-grain ID-TIMS. In this study, the mineralized Main Anorthosite Layer from the upper portion of the intrusion was dated using SHRIMP-II for the first time. High Th/U (0.9-3.7) zircons gave an upper intercept age of 2509.4 ± 6.2 Ma (2σ), whereas the lower portion of the intrusion was previously dated at 2501.5 ± 1.7 Ma, which suggests an out-of-sequence emplacement of the West-Pana intrusion. Furthermore, high-grade PGE mineralization hosted by the anorthosite layer, known as "South Reef", can be attributed to (1) downward percolation of PGE-enriched sulfide liquid from the overlying gabbronoritic magma or (2) secondary redistribution of PGEs, which may coincide with a post-magmatic alteration event recorded by low Th/U (0.1-0.9) zircon and baddeleyite at 2476 ± 13 Ma (upper intercept).

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Section: Methodsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

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“…ЗАКЛЮЧЕНИЕ В настоящей статье представлены результаты обоб щения большого объема информации по интрузивному магматизму ИВС и связанному с ним оруденению. ИВС входит в состав обширной изверженной Восточ ноСкандинавской провинции [Mitrofanov et al, 2013], является ее типичным представителем и в то же время одной из наиболее крупных и полно проявленных внутриконтинентальных рифтогенных структур Фен носкандинавского щита. Она выполнена сложнопо строенным комплексом осадочновулканогенных по род мощностью около 15 км, который развивался на протяжении почти 700 млн лет.…”

Section: малосульфидные платинопалладиевые (Ptpd)unclassified

“…Для обширной изверженной провинции Фенно скандинавского щита характерен огромный площад ной ареал развития (около 1 млн км 2 ), который вклю чает тесную пространственную ассоциацию протя женных вулканических и интрузивных поясов, а также дайковых роев и отражает, повидимому, параметры головной части мантийного плюма [Mitrofanov et al, 2013].…”

Section: Introductionunclassified

The Paleoproterozoic Imandra-Varzuga rifting structure (Kola Peninsula): intrusive magmatism and minerageny

Chashchin¹,

Mitrofanov²

2014

Geodyn. Tectonophys.

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The article provides data on the structure of the Paleoproterozoic intercontinental ImandraVarzuga rifting structure (IVS) and compositions of intrusive formations typical of the early stage of the IVS development and associated mineral resources. IVS is located in the central part of the Kola region. Its length is about 350 km, and its width varies from 10 km at the flanks to 50 km in the central part. IVS contains an association of the sedimentaryvolcanic, intrusive and dyke com plexes. It is a part of a large igneous Paleoproterozoic province of the Fennoscandian Shield spreading for a huge area (about 1 million km 2 ), which probably reflects the settings of the head part of the mantle plume. Two age groups of layered intru sions were associated with the initial stage of the IVS development. The layered intrusions of the FedorovoPansky and Monchegorsk complexes (about 2.50 Ga) are confined to the northern flank and the western closure of IVS, while intrusions of the Imandra complex (about 2.45 Ga) are located at the southern flank of IVS. Intrusions of older complexes are composed of rock series from dunite to gabbro and anorthosites (Monchegorsk complex) and from orthopyroxenite to gabbro and anor thosites (FedorovoPansky complex). Some intrusions of this complexes reveal features of multiphase ones. The younger Imandra complex intrusions (about 2.45 Ga) are stratified from orthopyroxenite to ferrogabbro. Their important feature is comagmatical connection with volcanites. All the intrusive complexes have the boninitelike mantle origin enriched by litho phyle components. Rocks of these two complexеs with different age have specific geochemical characteristics. In the rocks of the Monchegorsk and FedorovoPansky complexes, the accumulation of REE clearly depends on the basicity of the rocks, the spectrum of REE is nonfractionated and 'flat', and the Eu positive anomaly is slightly manifested. In the rocks of the Imandra complex, the level of REE accumulation is relatively higher. The spectrum of REE here differs with more fraction ated LREE with a 'flat' distribution of HREE and distinct Eu anomalies. Rocks of all the intrusive complexes are character ized mostly by negative ε Nd (T) values, and ε Nd values are distributed more heterogeneously in the rocks of the Monchegorsk complex than in the rocks of the FedorovoPansky complex. Deposits and occurrences of Cr, complex PGECuNi and low sulfide PtPd ores of the world class are spatially related and genetically associated with the IVS intrusive complexes. The Sopcheozero deposit (Monchepluton of the Monchegorsk complex) and Bolshaya Varaka deposit (the samename intrusion of the Imandra complex) represent a layered Cr mineralization. Complex PGECuNi deposits are confined to Monchepluton. They occur in vein ores of the NittisKumuzhyaTravyanaya massifs (which have been worked out) and Sopcha, vein PGE Cu, injecting Ni ores mostly and bottom deposits of the NittisKumuzhyaTravyanaya massifs, as well as in the Nyud 'criti cal' horizon. In the past 10-15 year...

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“…origin, since rocks of the Kandalaksha-Kolvitsa zone have similar isotope-geochronological features with layered PGE intrusions in the Baltic Shield (Fedorovo-Pana massif, Monchetundra massif, etc.) [6]. This paper focused on the dating of the formation and the further metamorphic reworking of the Kandalaksha and Kolvitsa anorthosite massifs.…”

Section: Introductionmentioning

confidence: 99%

The Paleoproterozoic Kandalaksha-Kolvitsa Gabbro-Anorthosite Complex (Fennoscandian Shield): New U–Pb, Sm–Nd, and Nd–Sr (ID-TIMS) Isotope Data on the Age of Formation, Metamorphism, and Geochemical Features of Zircon (LA-ICP-MS)

2020

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The paper provides new U–Pb, Sm–Nd, and Nd–Sr isotope-geochronological data on rocks of the Paleoproterozoic Kandalaksha-Kolvitsa gabbro-anorthosite complex. Rare earth element (REE) contents in zircons from basic rock varieties of the Kandalaksha-Kolvitsa area were analyzed in situ using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Plots of REE distribution were constructed, confirming the magmatic origin of zircon. Temperatures of zircon crystallization were estimated using a Ti-in-zircon geochronometer. The U–Pb method with a 205Pb artificial tracer was first applied to date single zircon grains (2448 ± 5 Ma) from metagabbro of the Kolvitsa massif. The U–Pb analysis of zircon from anorthosites of the Kandalaksha massif dated the early stage of the granulite metamorphism at 2230 ± 10 Ma. The Sm–Nd isotope age was estimated on metamorphic minerals (apatite, garnet, sulfides) and whole rock at 1985 ± 17 Ma (granulite metamorphism) for the Kolvitsa massif and at 1887 ± 37 Ma (high-temperature metasomatic transformations) and 1692 ± 71 Ma (regional fluid reworking) for the Kandalaksha massif. The Sm–Nd model age of metagabbro was 3.3 Ga with a negative value of εNd = 4.6, which corresponds with either processes of crustal contamination or primary enriched mantle reservoir of primary magmas.

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East Scandinavian and Noril’sk plume mafic large igneous provinces of Pd-Pt ores: Geological and metallogenic comparison

Cited by 37 publications

References 15 publications

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

The Paleoproterozoic Imandra-Varzuga rifting structure (Kola Peninsula): intrusive magmatism and minerageny

The Paleoproterozoic Kandalaksha-Kolvitsa Gabbro-Anorthosite Complex (Fennoscandian Shield): New U–Pb, Sm–Nd, and Nd–Sr (ID-TIMS) Isotope Data on the Age of Formation, Metamorphism, and Geochemical Features of Zircon (LA-ICP-MS)

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