A three-dimensional model of the Early Precambrian crust under the southeastern Fennoscandian Shield: Karelia craton and Belomorian tectonic province

Mints, Michael V.; Suleimanov, A. K.; Zamozhniaya, Nadezhda G.; Stupak, Vladimir M.

doi:10.1016/j.tecto.2008.12.008

Cited by 41 publications

(34 citation statements)

References 25 publications

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“…On the west, it is bounded by the Palaeoproterozoic (1.9–1.8 Ga) Svecofennian accretionary orogen, and on the northeast, it is cross‐cut by the 2.0–1.9 Ga Lapland–Kola collisional orogen (Balagansky et al., ; Hölttä et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Balangansky, et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Sorjonen‐Ward, et al., ). The Belomorian Province is thrust on the Archean Karelian Province (Craton) along a system of Palaeoproterozoic faults, and it consists of a few Archean tectonic nappes (Daly, Balagansky, Timmerman, & Whitehouse, ; Glebovitsky, ; Miller & Mil'kevich, ; Mints, Suleimanov, Zamozhniaya, & Stupak, ). The Karelian Province is typical for its Archean formation—composed of various gneissose granitoids, mainly a 3.50–2.60 Ga tonalite–trondhjemite–granodiorite (TTG) suite, some 2.74–2.70 Ga sanukitoids, and different generations of greenstone belts (Glebovitsky, ; Hölttä et al., ; Kulikov et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Balangansky, et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Sorjonen‐Ward, et al., ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Belomorian Province formed by the superposition of two collisional orogens, the Neoarchean Belomorian (Slabunov, ; Slabunov et al., ) and the Palaeoproterozoic Lapland–Kola Orogen (Daly et al., , ). It is sandwiched between the Karelian and Kola Provinces, and its internal structure is dominated by a large‐scale, intensely folded nappes formed in the Archean to Palaeoproterozoic (Miller & Mil'kevich, ; Mints et al., ; Sharov et al., ). The Belomorian Province consists mainly of Meso‐ and Neoarchean (2.9–2.7 Ga) TTG gneisses, greenstone complexes of different generations and paragneisses (similar to those in Karelia; Figure b), which were intensely deformed and metamorphosed in high‐ to moderate‐ P regimes in both the Archean and the Palaeoproterozoic.…”

Section: Geological Settingmentioning

confidence: 99%

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Quartz and orthopyroxene exsolution lamellae in clinopyroxene and the metamorphic P–T path of Belomorian eclogites

Zhang

Wei

et al. 2017

Journal Metamorphic Geology

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The Shirokaya Salma eclogite-bearing complex is located in the Archean-Palaeoproterozoic Belomorian Province (Russia). Its eclogites and eclogitic rocks show multiple clinopyroxene breakdown textures, characterized by quartz-amphibole, orthopyroxene and plagioclase lamellae. Representative samples, a fresh eclogite, two partly retrograded eclogites, and a strongly retrograded eclogitic rock, were collected for this study. Two distinct mineral assemblages-(1) omphacite+gar-net+quartz+rutileAEamphibole and (2) clinopyroxene+garnet+amphibole+plagio-clase+quartz+rutile+ilmeniteAEorthopyroxene-are described. Based on phase equilibria modelling, these assemblages correspond to the eclogite and granulite facies metamorphism that occurred at 16-18 kbar, 750-800°C and 11-15 kbar, 820-850°C, respectively. The quartz-amphibole lamellae in clinopyroxene formed during retrogression with water ingress, but do not imply UHP metamorphism.The superfine orthopyroxene lamellae developed due to breakdown of an antecedent clinopyroxene (omphacite) during retrogression that was triggered by decompression from the peak of metamorphism, while the coarser orthopyroxene grains and rods formed afterwards. The P-T path reconstructed for the Shirokaya Salma eclogites is comparable to that of the adjacent 1.9 Ga Uzkaya Salma eclogite (Belomorian Province), and those of several other Palaeoproterozoic high-grade metamorphic terranes worldwide, facts allowing us to debate the exact timing of eclogite facies metamorphism in the Belomorian Province. K E Y W O R D SBelomorian eclogite, clinopyroxene breakdown, pseudosection, PT path | INTRODUCTIONClinopyroxene breakdown textures have been recognized in many Phanerozoic high-grade metamorphic rocks worldwide. Quartz lamellae commonly found in them occur, for instance, in the ultrahigh-pressure (UHP) terranes of DabieSulu (Tsai & Liou, 2000), the Kokchetav Massif (Katayama, Parkinson, Okamoto, Nakajima, & Maruyama, 2000) and the Western Tianshan (Zhang, Ellis, & Jiang, 2002;Zhang, Song, Liou, Ai, & Li, 2005). The oriented precipitation of quartz in clinopyroxene is interpreted as resulting from breakdown of non-stoichiometric Ca-Escolabearing (CaEs, Ca 0.5 [ ] 0.5 AlSi 2 O 6 ) clinopyroxene due to the reaction CaEs=CaTs+Qz (Smith, 1984;Smyth, 1980). Quartz lamellae associated with amphibole have been widely observed in the high-pressure, high-temperature (HP-HT) terranes of the Bohemian Massif (Faryad & Fisera, 2015), the Kontum Massif Nakano, Osanai, Owada, Nam, et al., 2007) Page, Essene, & Mukasa, 2003 and Greek Rhodope (Proyer, Krenn, & Hoinkes, 2009), where they are indicative of fluid-driven retrogression. Furthermore, slow cooling with decompression is usually considered as being responsible for the exsolution of orthopyroxene ((Mg,Fe) 2 Si 2 O 6 ) in clinopyroxene, a process that commonly proceeds in (ultra)high-T granulites (e.g. Fonarev, Pilugin, Savko, & Novikova, 2006;Harley, 1987;Liu, Zhao, Zhao, Chen, & Liu, 2003;Sandiford & Powell, 1986) and ultrahigh-pressure metamorphic roc...

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Quartz and orthopyroxene exsolution lamellae in clinopyroxene and the metamorphic P–T path of Belomorian eclogites

Zhang

Wei

et al. 2017

Journal Metamorphic Geology

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“…The Suavjärvi structure is situated within the Karelian craton, which is the oldest (Neoarchean) stable domain of the Fennoscandian Shield (Lobach‐Zhuchenko et al. 1986; Rundquist and Mitrophanov 1993; Mints et al. 2009; and references therein).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Suavja¨rvi structure is situated within the Karelian craton, which is the oldest (Neoarchean) stable domain of the Fennoscandian Shield (Lobach-Zhuchenko et al 1986;Rundquist and Mitrophanov 1993;Mints et al 2009; and references therein). The basement of the craton is a late Archean (Lopian) granite-greenstone terrane consisting of granitoid-gneiss complexes and supracrustal rocks ranging in age between 3.14 and 2.62 Ga. Supracrustal metavolcanicsedimentary rocks form north-trending greenstone belts, surrounded by spatially more extensive granitoids and higher grade gneiss domains (Fig.…”

Section: Regional Geologymentioning

confidence: 99%

The Suavjärvi impact structure, NW Russia

Mashchak

Naumov

2012

Meteorit & Planetary Scien

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Abstract-We present the geology and interpreted shock features of the Suavja¨rvi circular structure. Suavja¨rvi is a circular feature (illustrated by satellite imagery, topography, and magnetic data) located in the central part of the Karelian Craton (lat. 63°07¢N, long. 33°23¢E). To date, little information on the geologic and impact features of the Suavja¨rvi structure is available in the literature. The structure is characterized by gravity and magnetic lows and disruption of the regional magnetic fabric. In the northeastern and southwestern parts of the structure, several erosional remnants of highly disturbed rocks occur referred to as monomict and polymict megabreccia. These comprise blocks of both basement granitoids and supracrustal greenstone rocks. The impact origin of polymict megabreccia and therefore of the Suavja¨rvi structure is confirmed by observations of closely spaced planar microstructures at angles consistent with planes that have Miller indices indicative of impact shock effects, mostly of x{10 13}. The Suavja¨rvi is considered to be a remnant of a deeply eroded and metamorphosed impact structure, which has a diameter of 16 km and was formed during the Paleoproterozoic (older than 2.2 Ga); this is inferred from the age of the overlying volcanic-sedimentary Jatulian sequence. Suavja¨rvi underwent regional metamorphism that resulted in obliteration or transformation of shock metamorphic effects. Massive sulfides occur within megabreccia; originating probably from postimpact redeposition of pre-existing mineralization.

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“…2; POLAR, SVEKA81, BALTIC, FIRE1, FIRE4) or revealing the internal architecture of the Archean (EU1, 4B, KostomukshaPechenga) or Paleoproterozoic (EGT/FENNOLORA, FINLAP7) (LUOSTO et al 1990;GUGGISBERG et al 1991;SHAROV 1993;MINTS et al 2004a;MINTS et al 2004b;GRAD and LUOSTO 1987;LUOSTO et al 1989;KUKKONEN et al 2006;PATISON et al 2006;JANIK et al 2009). Nevertheless, neither the lateral change along the strike of the terranes nor the more gradual NW-SE change from Archean to Paleoproterozoic dominated areas, is well understood.…”

Section: Introductionmentioning

confidence: 99%

Crustal Architecture of the Inverted Central Lapland Rift Along the HUKKA 2007 Profile

Tiira

Janik

Kozlovskaya

et al. 2013

Pure Appl. Geophys.

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Abstract-We have studied the lateral velocity variations along a partly buried inverted paleo-rift in Central Lapland, Northern Europe with a 2D wide-angle reflection and refraction experiment, HUKKA 2007. The experiment was designed to use seven chemical explosions from commercial and military sites as sources of seismic energy. The shots were recorded by 102 stations with an average spacing of 3.45 km. Two-dimensional crustal models of variations in P-wave velocity and Vp/Vs-ratio were calculated using the ray tracing forward modeling technique. The HUKKA 2007 experiment comprises a 455 km long profile that runs NNW-SSE parallel to the Kittilä Shear Zone, a major deformation zone hosting gold deposits in the area. The profile crosses Paleoproterozoic and reactivated Archean terranes of Central Lapland. The velocity model shows a significant difference in crustal velocity structure between the northern (distances 0-120 km) and southern parts of the profile. The difference in P-wave velocities and Vp/Vs ratio can be followed through the whole crust down to the Moho boundary indicating major tectonic boundaries. Upper crustal velocities seem to vary with the terranes/compositional differences mapped at the surface. The lower layer of the upper crust displays velocities of 6.0-6.1 km/s. Both Paleoproterozoic and Archean terranes are associated with high velocity bodies (6.30-6.35 km/s) at 100 and 200-350 km distances. The Central Lapland greenstone belt and Central Lapland Granitoid complex are associated with a 4 km-thick zone of unusually low velocities (\6.0 km/s) at distances between 120 and 220 km. We interpret the HUKKA 2007 profile to image an old, partly buried, inverted continental rift zone that has been closed and modified by younger tectonic events. It has structural features typical of rifts: inward dipping rift shoulders, undulating thickness of the middle crust, high velocity lower crust and a rather uniform crustal thickness of 48 km.

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A three-dimensional model of the Early Precambrian crust under the southeastern Fennoscandian Shield: Karelia craton and Belomorian tectonic province

Cited by 41 publications

References 25 publications

Quartz and orthopyroxene exsolution lamellae in clinopyroxene and the metamorphic P–T path of Belomorian eclogites

Quartz and orthopyroxene exsolution lamellae in clinopyroxene and the metamorphic P–T path of Belomorian eclogites

The Suavjärvi impact structure, NW Russia

Crustal Architecture of the Inverted Central Lapland Rift Along the HUKKA 2007 Profile

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