The origin of the Palaeoproterozoic AMCG complexes in the Ukrainian shield: New U-Pb ages and Hf isotopes in zircon

Shumlyanskyy, Leonid; Hawkesworth, Chris J.; Billström, Kjell; Bogdanova, Svetlana; Mytrokhyn, O.; Romer, Rolf L.; Dhuime, Bruno; Claesson, Stefan; Ernst, Richard E.; Whitehouse, Martin J.; Bilan, Olena

doi:10.1016/j.precamres.2017.02.009

Cited by 71 publications

(35 citation statements)

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“…The other two sources related to the crystalline basement of the European Platform (the Fennoscandian and Ukrainian Shields) probably had a small share in the delivery of clastic material to the Miechów area, mainly due to their considerable distance. Moreover, these areas are mostly built of gneisses and granitoids of different ages [137,138]; therefore, the mineral chemistry of the tourmaline should be close to schorl. These rocks are also rich in biotite and Ti-bearing magnetite, the components of which were not found in large amounts in the set of heavy minerals in the Albian sands from the vicinity of Miechów.…”

Section: Discussionmentioning

confidence: 99%

Tourmalines as a Tool in Provenance Studies of Terrigenous Material in Extra-Carpathian Albian (Uppermost Lower Cretaceous) Sands of Miechów Synclinorium, Southern Poland

2020

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The mature transgressive Albian quartz sands in the Miechów Synclinorium contain a poor (<1%) heavy mineral suite consisting of tourmaline, rutile, garnet, staurolite, ilmenite, zircon, monazite, kyanite, and gahnite. The other minerals, especially those containing Fe and Ti (e.g., biotite), are subordinate. Over 512 tourmaline grains from seven outcrops in the Miechów Segment were analysed using electron probe microanalysis (EPMA). The majority of grains belong to the alkali tourmaline group in which the X-site is dominated by Na (0.4 to 0.9 apfu). Detrital tourmalines are mainly dravite with a prevalent schorl end-member with average XMg values over 0.6. Apart from Mg and Fe, the other Y-site cations rarely exceed 0.1 apfu. Fluorine content is usually below the detection limit. Their chemical composition suggests that most tourmaline grains were sourced from Al-rich and Al-poor metapelites/metapsammites. The main source rocks for the Albian sands were rocks from low- to medium-grade metamorphism, probably from Al-rich quartz-muscovite schist and/or muscovite rich gneisses. Additional minor source rocks were granites and pegmatites coexisting with them. A comparison of the examined tourmaline to tourmaline from possible source areas indicates that these areas were located in the eastern part of the Bohemian Massif and/or eastern Sudetes.

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Section: Discussionmentioning

confidence: 99%

Tourmalines as a Tool in Provenance Studies of Terrigenous Material in Extra-Carpathian Albian (Uppermost Lower Cretaceous) Sands of Miechów Synclinorium, Southern Poland

2020

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“…3). The S reflector can be tentatively linked with the AMCG intrusion, representing a sill (or top of the layered intrusion) fed by the mafic dykes as in the Shumlyanskyy et al (2017) model for the Korosten Pluton in Ukraine. An alternative explanation invokes a much younger magmatic event.…”

Section: Discussion and Preliminary Interpretationmentioning

confidence: 99%

Imaging the East European Craton margin in northern Poland using extended correlation processing of regional seismic reflection profiles

Mężyk¹,

Malinowski

Mazur

2019

Solid Earth

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Abstract. In NE Poland, Eastern European Craton (EEC) crust of Fennoscandian affinity is concealed under a Phanerozoic platform cover and penetrated by sparse, deep research wells. Most of the inferences regarding its structure rely on geophysical data. Until recently, this area was covered only by the wide-angle reflection and refraction (WARR) profiles, which show a relatively simple crustal structure with a typical three-layer cratonic crust. ION Geophysical PolandSPAN™ regional seismic programme data, acquired over the marginal part of the EEC in Poland, offered a unique opportunity to derive a detailed image of the deeper crust. Here, we apply extended correlation processing to a subset (∼950 km) of the PolandSPAN™ dataset located in NE Poland, which enabled us to extend the nominal record length of the acquired data from 12 to 22 s (∼60 km of depth). Our new processing revealed reflectivity patterns, which we primarily associate with the Paleoproterozoic crust formed during the Svekofennian (Svekobaltic) orogeny, that are similar to those observed along the BABEL and FIRE profiles in the Baltic Sea and Finland, respectively. We propose a mid- to lower-crustal, orogeny-normal lateral flow model to explain the occurrence of two sets of structures that can be collectively interpreted as kilometre-scale S–C′ shear zones. The structures define a penetrative deformation fabric invoking ductile extension of hot orogenic crust in a convergent setting. Localized reactivation of these structures provided conduits for subsequent emplacement of gabbroic magma that produced a Mesoproterozoic anorthosite–mangerite–charnockite–granite (AMCG) suite in NE Poland. Delamination of thickened orogenic lithosphere may have accounted for magmatic underplating and fractionation into the AMCG plutons. We also found sub-Moho dipping mantle reflectivity, which we tentatively explain as a signature of the crustal accretion during the Svekofennian orogeny. Later tectonic phases (e.g. Ediacaran rifting, Caledonian orogeny) did not leave a clear signature in the deeper crust; however, some of the subhorizontal reflectors below the basement, observed in the vicinity of the AMCG Mazury complex, can be alternatively linked with lower Carboniferous magmatism.

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“…Complexes, which are found in several cratonic areas in the world -e.g., Baltica, Australia, North China and North America (Emslie et al, 1994;Shumlyanskyy et al, 2017). In the Amazonian Craton, AMCG's complexes are described in Rondônia (Rizzotto et al, 1996;Bettencourt et al, 1999;Scandolara et al, 2013) and in Roraima (Fraga, 2002;Fraga et al, 2009a, b;Heinonen et al, 2012), respectively, in the Central Brazil and Guiana Shields.…”

Section: An Important Evidence Of Correlation Between Cratonic Blocksmentioning

confidence: 99%

The long life of SAMBA connection in Columbia: A paleomagnetic study of the 1535 Ma Mucajaí Complex, northern Amazonian Craton, Brazil

et al. 2020

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The origin of the Palaeoproterozoic AMCG complexes in the Ukrainian shield: New U-Pb ages and Hf isotopes in zircon

Abstract: General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms

Cited by 71 publications

References 68 publications

Tourmalines as a Tool in Provenance Studies of Terrigenous Material in Extra-Carpathian Albian (Uppermost Lower Cretaceous) Sands of Miechów Synclinorium, Southern Poland

Tourmalines as a Tool in Provenance Studies of Terrigenous Material in Extra-Carpathian Albian (Uppermost Lower Cretaceous) Sands of Miechów Synclinorium, Southern Poland

Imaging the East European Craton margin in northern Poland using extended correlation processing of regional seismic reflection profiles

The long life of SAMBA connection in Columbia: A paleomagnetic study of the 1535 Ma Mucajaí Complex, northern Amazonian Craton, Brazil

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