U–Pb zircon geochronology and geochemistry of Paleoproterozoic magmatic suite from East Sarmatian Orogen: Tectonic implications on Columbia supercontinent

Terentiev, R. A.; Skryabin, VYu; Santosh, M.

doi:10.1016/j.precamres.2015.12.009

Cited by 24 publications

(8 citation statements)

References 68 publications

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“…3b) during the Svecofennian and related orogenic pulses (Bogdanova et al, 2008). Terentiev et al (2016) documented extensive Paleoproterozoic magmatism in the East Sarmatian Orogen, located at the junction of the Sarmatian and Volga-Ural segments of the East European Craton. They correlated the magmatism with tectonics associated with the amalgamation of the global supercontinent Columbia.…”

Section: Laurentia-siberia-balticamentioning

confidence: 99%

The Columbia supercontinent revisited

2017

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Section: Laurentia-siberia-balticamentioning

confidence: 99%

The Columbia supercontinent revisited

2017

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“…Brightness contrasts in the zircons are generally ex plained as a function of U content, with high-U zones corresponding to dark zones of crystals (Miller and Wooden 2004;Terentiev et al 2016). In the present case, the CL images indicate that U concentration ranges widely both within and between grains.…”

Section: Zircon Texturesmentioning

confidence: 46%

“…Magmatic crystallization processes can be deciphered using zircon features such as typical growth zoning, sector zoning and presence of overgrowths (Corfu et al 2003;Ji et al 2009;Terentiev et al 2016). In the Sabga area, some of the zircon grains ( Fig.…”

Section: Fractional Crystallizationmentioning

confidence: 99%

Petrology and geochronology of felsic volcanics in the Sabga area (Bamenda Highlands): implications for age variation along the Cameroon Volcanic Line

Tibang¹,

Suh²,

Cottle³

et al. 2018

J. Geosci.

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The textural characteristics of felsic lavas and ignimbrites in the Sabga area along the continental segment of the Came roon Volcanic Line (CVL) are documented in this study. Two rhyolitic lava flows separated by mafic and rhyodacitic lava flows were dated by zircon LA-ICP-MS technique in order to constrain the timescales of successive flow emplace ment as well as magma chamber processes in this volcanic field. The studied samples have rheomorphic characteristics such as eutaxitic textures defined by elongated fiamme as well as deformed and welded glass shards. They exhibit flow banding and contain spherulitic groundmass. Rhyolitic autobreccias and ignimbrites are widespread in the Sabga area, are peralkaline in nature and their ages are broadly similar at ~23.0 ± 0.3 Ma (23.34 ± 0.34 Ma for the ignimbrite and 22.98 ± 0.28 Ma for the rhyolitic autobreccia unit). These ages suggest rapid recharge of magma into a periodically replenished and open chamber. The felsic rocks in the Sabga area and around the Bamenda Highlands are also younger compared to other felsic units along the CVL (29 Ma to 69.4 ± 0.4 Ma).

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“…1. Scheme of structure-tectonic zoning of the Precambrian basement of the Voronezh Crystalline Massif, after Terentiev et al (2016), with supplements (a); scheme of the location of intrusive bodies (b). a: 1, deposits of the Losevo (a) and Don (b) terranes; 2, Paleoproterozoic rocks of the Vorontsovka terrane; 3, Archean deposits of the Kursk terrane; 4, synclinorium structures composed of Paleoproterozoic rocks; 5, contour lines of the absolute levels of the Precambrian basement surface (m).…”

Section: Geological Situationmentioning

confidence: 99%

Paleoproterozoic high-Mg low-Ti gabbro-granite series in eastern Sarmatia: Geochemistry and formation conditions

Terentiev

Савко

2016

Russian Geology and Geophysics

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We present nomenclature and geochemical classification of Paleoproterozoic LILE-enriched high-Mg low-Ti mafic-granitoid rocks of the eastern margin of the Sarmatia paleocontinent and substantiate their tectonic position. Two differentiated rock series are recognized:(1) biotite-orthopyroxene melanorite-quartz-meladiorite-melagranodiorite and (2) hornblende-biotite quartz-diorite-tonalite-granodiorite. Both series correspond in chemical composition to calc-alkalic gabbro-diorites, diorites, tonalites, and granodiorites. As follows from their mineralogical and geochemical compositions, these are norite-diorite rocks (intrusive analogs of boninites) (SiO 2 = 52-65 wt.%, MgO = 5-20 wt.%, TiO 2 = 0.2-0.8 wt.%) and high-Mg granitoids (SiO 2 = 60-70 wt.%, Na 2 O/K 2 O = 0.65-1.33, MgO = 3.23-7.40 wt.%, K 2 O = 1.9-4.0 wt.%), respectively. Their high Mg# values (67-87) and Cr contents (>100 ppm), on the one hand, and their isotope-geochemical characteristics similar to those of the host metaterrigenous rocks, the magma enrichment in LILE, and the presence of Ni sulfide ores with a predominance of light sulfur isotopes, on the other, testify to crustal contamination of mantle magmas. The rock series are nearly of the same age and belong to the same magmatic system, where high-Mg granitoids are differentiates of parental high-Mg (boninite-like) norite-dioritic magma. This is confirmed by a gradual increase in SiO 2 and K 2 O contents and a decrease in Mg# and Ni, Co, V, and Cr contents in the sequence from norites to granodiorites and by the facies and phase relationships between the series. Intrusion of rocks took place at shallow depths following the low-temperature metamorphism and folding under postcollisional collapse of the East Sarmatian orogen.

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U–Pb zircon geochronology and geochemistry of Paleoproterozoic magmatic suite from East Sarmatian Orogen: Tectonic implications on Columbia supercontinent

Cited by 24 publications

References 68 publications

The Columbia supercontinent revisited

The Columbia supercontinent revisited

Petrology and geochronology of felsic volcanics in the Sabga area (Bamenda Highlands): implications for age variation along the Cameroon Volcanic Line

Paleoproterozoic high-Mg low-Ti gabbro-granite series in eastern Sarmatia: Geochemistry and formation conditions

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