Early Paleoproterozoic felsic and mafic magmatism in the Karelian province of the Fennoscandian shield

Lauri, Laura S.; Mikkola, Perttu; Karinen, Tuomo

doi:10.1016/j.lithos.2012.01.013

Cited by 39 publications

(6 citation statements)

References 61 publications

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“…Further to the south, scattered A-type intrusions dated at 2.43-2.39 Ga are found (Mikkola et al, 2010). These early Paleoproterozoic granites are small (b 100 km 2 ), discordant plutons and they were emplaced into a Mesoarchean TTG-dominated crust (see Lauri et al, 2012-…”

Section: A-type Associations Examined and Their Temporal Contextmentioning

confidence: 99%

IGCP Project 510 “A-type Granites and Related Rocks through Time”: Project vita, results, and contribution to granite research

Dall’Agnol

Frost

Rämö

2012

Lithos

135

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Section: A-type Associations Examined and Their Temporal Contextmentioning

confidence: 99%

IGCP Project 510 “A-type Granites and Related Rocks through Time”: Project vita, results, and contribution to granite research

Dall’Agnol

Frost

Rämö

2012

Lithos

135

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“…In contrast, the predominantly felsic basement of the Belorussian High is generally poor in iron and associated metals (Pap, ). The Fennoscandian Shield is also predominantly felsic (Lahtinen, ; Lauri et al ., ), and of the three possible provinces, it is the most remote from the studied sections (Fig. ).…”

Section: Discussionmentioning

confidence: 99%

“…The Precambrian basement of the Belorussian High is strongly dominated by gneisses and felsic intrusives with very few ores (Pap, ). The eastern Fennoscandian Shield is dominated by felsic blocks with subordinate greenstones and relatively rare mafic intrusions (Hölttä et al ., ; Lahtinen, ; Lauri et al ., ).…”

Section: Palaeogeographic Contextmentioning

confidence: 97%

The upper Viséan–Serpukhovian in the type area for the Serpukhovian Stage (Moscow Basin, Russia): Part 2. bulk geochemistry and magnetic susceptibility

2014

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This study is the summary analysis of bulk XRF geochemistry (233 samples from three sections) of the Oka and Zaborie groups of the type Serpukhovian succession in the Moscow Basin. The siliciclastic wedges in the limestone-dominated Oka Group are two to three times enriched in Fe, Ti, and Zr compared to Clarke values. Bulk iron strongly correlates with magnetic susceptibility. Iron tends to form ferruginized horizons (original siderites) in finer grained siliciclastic beds associated with coal seams. These beds also tend to be enriched in Cu, Ni, Pb, Zn, and other trace metals (metal enrichment horizons or MEHs). MEHs formed in ponded conditions of coastal low-pH marshlands vegetated by mangrove-like lycopsid bushes. Well-drained environments of palaeokarst formation and alkaline everglades (Akulshino palustrine event) on the other hand did not accumulate Fe and trace metals. The thin shale seam (found close to the Viséan-Serpukhovian boundary in Polotnyanyi Zavod) has unusually high Rb and Sr values, which may contain volcanigenic material useful for absolute dating. The Gurovo Formation (Steshevian Substage of the Serpukhovian) is less enriched in Fe and Ti. In the Gurovo Formation, the transition from the lower montmorillonitic shale (Glazechnya Member) to the upper palygorskitic shale (Dashkovka Member) is expressed by a five-fold increase in background MgO values, which indicates progressive shoaling and climatic aridization. Phosphorus remains close to 0% in the Oka Group and tends to increase in the Zaborie Group, in agreement with a dramatic increase of conodont numbers and other signatures of a lower Serpukhovian marine transgression. The lower half of the Glazechnya Member exhibits fluctuating enrichment in Fe, Cu, Ni, Pb, Zn, V, Cr, and Co. These fluctuations are mostly inverse to fluctuations of Mn. This pattern has been interpreted as a signature of seafloor oxygen deficiency, where Mn-rich samples record oxygen-poor environments (redox barrier level with the sediment surface) and Mn-poor samples enriched in Fe and trace metals record transitions to anoxic setting. This interval is interpreted as the Lower Serpukhovian highstand. Enrichment in Fe, Ti, and Zr of Oka siliciclastic units of Polotnyanyi Zavod indicates provenance from the ore-rich Voronezh Land, south of the Moscow Basin. The westerly flux regarded as a possible provenance in previous palaeogeographic reconstructions is discarded for the studied sections. The Gurovo Shale is also linked to the Voronezh province, although Fe, Ti, and Zr concentrations are lower than in the Oka shales.

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“…Our review of literature suggests that in contrast to A2-type suites, early Paleoproterozoic (2.0-2.5 Ga) examples of A1-type suites with an OIB-like chemical signature are globally extremely rare (see Electronic Appendix F2-4), which is astonishing considering the large number of studies conducted on A-type suites worldwide (e.g., Bonin, 2007;Dall'Agnol et al, 2012;Grebennikov, 2014 and references therein). In comparison to the 2.05 Ga Otanmäki suite, most of the recorded A1-type suites (including granites and intermediate rocks and/or their volcanic equivalents) are mostly considerably younger (<1.0 Ga; see Electronic Appendix F4), with only few being older (2.44 Ga; Lauri et al, 2012;and 2.7-2.6 Ga;Zozulya et al, 2005 and references therein), and only one being similar in age (the 2.06 Ga Katugin suite, southern Siberia; Gladkochub et al, 2017;Donskaya et al, 2018). The recorded examples are located mostly in withinplate settings (oceanic or continental), either in hotspots, rift belts or triple junctions near divergent boundaries of lithospheric plates.…”

Section: Comparison With Other A-type Suitesmentioning

confidence: 99%

Geology, geochronology and geochemistry of the 2.05 Ga gneissic A1-type granites and related intermediate rocks in central Finland: implication for the tectonic evolution of the Karelia craton margin

Kärenlampi¹,

Kontinen²,

Huhma³

et al. 2019

Bull Geol Soc Finland

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The 2.05 Ga Otanmäki suite represents a globally rare occurrence of Paleoproterozoic non-orogenic A1-type magmatism. It consists of a broad variety of A-type felsic and intermediate igneous rocks including monzodiorites, monzonites, syenites and peralkaline to peraluminous granites, containing both plutonic and subvolcanic members. The suite has chemical characteristics similar to those of A1-type suites formed in intraplate hotspots or continental rifts by differentiation of variably crustally contaminated, mafic mantle-derived magmas. However, compared to the Otanmäki rocks, most A1-type suites are considerably younger. Unraveling the original geologic setting of the Otanmäki suite is challenging because the suite was disintegrated, deformed and metamorphosed under amphibolite facies conditions (T ~550-600 ºC, P ~4 kbar) during the Svecofennian collisional orogeny (ca. 1900 Ma), i.e., 150-200 Ma after its initial emplacement. As a result, Otanmäki suite rocks are now found as pervasively foliated rocks within two nappe units sandwiched between Archean granitoid gneiss complexes and Paleoproterozoic supracrustal belts. The occurrence of slivers of 1950 Ma ocean-continent-transition ophiolitic rocks in the same thrust belt and the proximity of the Otanmäki suite to the Karelia-Svecofennia margin suggest that the suite records an early stage of a slow, ca. 100-Ma-long extension-rifting process which, at ca. 1950 Ma, eventually led to the final break-up of the Karelia craton and formation of the nascent ocean basin witnessed by the Jormua ophiolite complex.

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Early Paleoproterozoic felsic and mafic magmatism in the Karelian province of the Fennoscandian shield

Cited by 39 publications

References 61 publications

IGCP Project 510 “A-type Granites and Related Rocks through Time”: Project vita, results, and contribution to granite research

IGCP Project 510 “A-type Granites and Related Rocks through Time”: Project vita, results, and contribution to granite research

The upper Viséan–Serpukhovian in the type area for the Serpukhovian Stage (Moscow Basin, Russia): Part 2. bulk geochemistry and magnetic susceptibility

Geology, geochronology and geochemistry of the 2.05 Ga gneissic A1-type granites and related intermediate rocks in central Finland: implication for the tectonic evolution of the Karelia craton margin

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