Neoarchean gabbroids of the Fennoscandian shield Belomorsk province: Geology, composition, and geochronology

Слабунов, А. И.; Stepanova, A. V.; Bibikova, Elena; Babarina, I. I.; Matukov, D. I.

doi:10.1134/s1028334x08080059

Cited by 18 publications

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“…The Kola Province is a collage of three terrane types; in particular, these are Archean granitoids with minor greenstones (2.9–2.7 Ga), a mélange of Neoarchean and juvenile Palaeoproterozoic rocks, and a Palaeoproterozoic granulite complex (Lapland and Umba, Figure b; Balagansky, ; Daly et al., ; Glebovitsky, ; Hölttä et al., ). 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., ).…”

Section: Geological Settingmentioning

confidence: 99%

“…(a) Main tectonic units of the Fennoscandian Shield ( BP , Belomorian Province; KP , Kola Province; after Balagansky, ; Balagansky et al., ; Daly et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Balangansky, et al., ; Slabunov, Lobach‐Zhuchenko, Bibikova, Sorjonen‐Ward, et al., ); (b) geological map of the northern part of the Belomorian Province with eclogite locations (Slabunov, ; Slabunov et al., with modification after Balagansky et al., ; Hölttä et al., ; Miller & Mil'kevich, ; Mitrofanov, ; Shchipansky, Khodorevskaya, et al., ; Volodichev et al., ): star symbols on the map are the locations of the (1) Shirokaya Salma, (2) Uzkaya Salma, (3) Kuru‐Vaara and (4) Gridino eclogite‐bearing complexes (after Mints, Belousova, et al., ; Mints et al., ); (c) schematic map of Shirokaya Salma eclogite‐bearing mélange with sampling locations (ShS‐1–ShS‐14; after Mints, Belousova, et al., ; Mints & Kolinov, ; Shchipansky, Khodorevskaya, et al., and consultation with Sibilev O.S. )…”

Section: Geological Settingmentioning

confidence: 99%

“…In most cases, ancient (>2.0–1.9 Ga) high‐grade metamorphic terranes rarely preserve (pristine) eclogite—examples are the Hengshan granulite complex (North China Craton, 1.9–1.8 Ga, Zhao, Cawood, Wilde, & Lu, ), the Snowbird granulite–eclogite complex (Canada, 1.9 Ga, Baldwin, Bowring, & Williams, ), the Lapland granulite complex (Russia, 1.9 Ga, Daly et al., ) and the Ubendian/Usagaran eclogite‐bearing complex (Tanzania, 2.0–1.9 Ga, Collins, Reddy, Buchan, & Mruma, ). Overall, there are three scenarios invoked for the formation and evolution of the Belomorian eclogites (see Perchuk & Morgunova, ): scenario I, a single Mesoarchean eclogite facies metamorphism (Dokukina & Konilov, ; Dokukina et al., ; Mints, Belousova, et al., ; Mints, Konilov, et al., ); scenario II, at least two eclogite facies events in the Archean and the Palaeoproterozoic (Balagansky et al., ; Slabunov, Stepanova, Bibikova, Babarina, & Matukov, ; Slabunov, Volodichev, Skublov, & Berezin, ; Volodichev, Slabunov, Sibelev, Skublov, & Kuzenko, ); and, scenario III, a single Palaeoproterozoic eclogite facies metamorphism at 1.9 Ga (Herwartz, Skublov, Berezin, & Mel'nik, ; Mel'nik, Skublov, Marin, Berezin, & Bogomolov, ; Skublov, Berezin, & Mel'nik, ; Skublov et al., ; Travin & Kozlova, ). The Shirokaya Salma eclogites have previously been considered as having a Meso‐Neoarchean age (e.g.…”

Section: Introductionmentioning

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%

Section: Introductionmentioning

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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“…According to another opinion, twofold eclogite facies metamorphism happened in the Neoarchean and the Palaeoproterozoic in the course of two distinct orogenies (e.g. Balagansky et al., 2015; Slabunov et al., 2008). For the Salma locality, our recent works established Palaeoproterozoic ages of (mafic) eclogite (1.91 Ga, Li, Yu, Zhang, et al., 2017) and HP metamorphism (1.9–2.0 Ga, Li, Zhang, Wei, Slabunov, et al., 2017; Liu et al., 2017; Yu, Zhang, Lanari, et al., 2019; Yu, Zhang, Zhang, et al., 2019) and speculated about Archean HP granulite facies metamorphism (Li, Zhang, Wei, Slabunov, et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

The metamorphic PT history of Precambrian Belomorian eclogites (Shirokaya Salma), Russia

Zhang

Bader

2020

Journal Metamorphic Geology

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This petrological study details representative well‐preserved and partly retrogressed eclogite samples from the Shirokaya Salma locality in the Belomorian Province (Russia) to resolve ambiguity in the PT evolution of one of the oldest eclogite occurrences on Earth. Based on microstructures, eclogite and granulite facies mineral assemblages comprise omphacite, garnet (interior), quartz, rutile±phengite and diopside, garnet (modified rim), plagioclase, orthopyroxene, amphibole, quartz, rutile/ilmenite±melt respectively. Omphacite and Na‐bearing diopside feature breakdown textures with multiple oriented quartz–amphibole and orthopyroxene lamellae, while diopside forms symplectite with plagioclase. Garnet often exhibits a particular compositional annulus in both major and trace elements (Y+REE). We interpret the high‐Ca and inclusion‐rich garnet (core) with outwards Grs decrease and Prp increase as relict of prograde growth. The mantle‐rim domain of garnet, containing omphacite, diopside, plagioclase and rutile formed during eclogitization. Compositionally homogeneous garnet porphyroblasts are most likely outcomes of high‐T modifications. A progressive zonation of Y+REE from core to rim in several garnets is related to resorption at high temperatures. Both geothermometric and pseudosection calculations reveal a typical orogenic clockwise trajectory for the studied eclogites, and their metamorphic PT path includes a possible pre‐eclogitic stage (M0) at <630°C, ~16–19 kbar, a peak eclogite facies stage (M1) at 19–21 kbar, 670–750°C, a granulite facies overprint (stage M2) from 14–16 kbar, 830–870°C (M2a) to 10–11 kbar, 880–910°C (M2b), and retrogression to <9–11 kbar, <650–680°C (stage M3). It agrees well with our previous estimates for other Salma eclogites with Palaeoproterozoic ages.

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“…As described by Slabunov et al (2006) and summarized by Hölttä et al (2008), Karelia is subdivided into the Vodlozero, Central Karelia and Western Karelia subprovinces by lithology, structure and ages (Hölttä et al, 2012). The Vodlozero subprovince is centered on 3.2-3.1 Ga granitoids onto which three generations of greenstone belts were accreted from 3.1-2.6 Ga (Slabunov et al, 2008;Hölttä et al, 2012).…”

Section: Geological Settingmentioning

confidence: 99%

Testing the Paleogeography of Late Archean Supercraton Superia using Pre-Breakup 2.51-1.98 Ga dyke and Sill Provinces – with a Focus on the Relationship Between the Karelia-Kola and Superior Cratonic Fragments

Davey¹

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Archean cratons are dispersed crustal fragments derived from larger ancestral landmasses. Their individual and combined study in paleogeographic reconstructions reveal details relevant to understanding larger Archean tectonic systems. Canada's Superior craton is considered the central piece of the late Archean Superia supercraton paleogeographic reconstruction that also includes the Karelia-Kola (Finland/Russia), Wyoming (USA), and Hearne (Canada) cratons. The relationship between Superior and Karelia-Kola is of interest because the position of the Karelia-Kola craton within the context of the Superia reconstruction is not fully resolved. Dyke swarm correlations based on age and geometry indicate that Karelia-Kola and Superior were 'nearest-neighbours', yet paleomagnetic studies disagree. However, these data are complicated due to multiple metamorphic overprints, and are limited by a lack of high-precision U-Pb ages. The focus of this study is to test the correlation between the Karelia-Kola and Superior cratons by integrating U-Pb geochronology, whole-rock major, trace element and Sm-Nd isotope geochemistry, and dyke swarm geometry. These methods confirm the occurrence of sharply timed large igneous provinces (LIP) in Karelia-Kola correlated to Superior using geochronology, test whether the magmas were from a common source, and refine the paleogeographic Superia reconstruction by incorporating regional dyke trends. This study presents nine ages from dykes and sills that confirm LIP correlations between the Karelia-Kola and Superior cratons at ca. 2.40 Ga, 2.22 Ga, 2.11 Ga and 1.98 Ga, and three ages at ca. 2.32 Ga confined to Karelia-Kola. Geochemical studies were completed on mafic magmatic events at ca. 2.22 Ga and 2.11 Ga. The evaluation of 2.22 I have been fortunate to work under the guidance of three passionate supervisors. Dr. Wouter Bleeker's role has been fundamental to my development as a scientist, and the progression of this thesis as a whole. I would like to thank Dr. Richard E. Ernst for his encouragement to pursue graduate school in 2010 and again in 2014, and for his belief in me over the years. I am appreciative to have had Dr. Brian Cousens across the hall, whose open-door was a necessity for understanding and interpreting geochemistry. I would also like to acknowledge the unofficial supervision I received from Dr. Sandra L. Kamo at the University of Toronto. She is a skilled scientist and a natural teacher who has made a substantial contribution to this thesis. Sandra let me learn geochronology at my own pace, even when that meant I might not do something perfectly the first time. When I did make a mistake, we discussed it not as a failure, but as a learning experience. In doing so, she gave me the confidence to try more lab work, then helped me realize that it is something that I can do, and more importantly, something that I really enjoy.

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Neoarchean gabbroids of the Fennoscandian shield Belomorsk province: Geology, composition, and geochronology

Cited by 18 publications

References 1 publication

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 metamorphic PT history of Precambrian Belomorian eclogites (Shirokaya Salma), Russia

Testing the Paleogeography of Late Archean Supercraton Superia using Pre-Breakup 2.51-1.98 Ga dyke and Sill Provinces – with a Focus on the Relationship Between the Karelia-Kola and Superior Cratonic Fragments

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