Archaean to Palaeoproterozoic high-grade evolution of the Belomorian eclogite province in the Gridino area, Fennoscandian Shield: Geochronological evidence

Dokukina, Ksenia A.; Каулина, Т. В.; Konilov, A. N.; Mints, Michael V.; Ван, К. В.; Natapov, Lev M.; Белоусова, Е. А.; Симакин, С. Г.; Lepekhina, E. N.

doi:10.1016/j.gr.2013.02.014

Cited by 49 publications

(61 citation statements)

References 62 publications

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“…2.82–2.70 Ga, although two zircon overgrowths with ages of c . 1.9 Ga have also been reported in these studies (Dokukina et al., ; Li et al., ; Mints et al., ), and an age of c . 1.9 Ga for the metamorphism has been proposed by Skublov, Astaf'ev, et al.…”

Section: Introductionsupporting

confidence: 71%

“…The Belomorian Province records several magmatic events ranging from Neoarchean to Paleoproterozoic in age and the rocks record polyphase deformation. Thermal pulses are attributed to the rise of mantle plumes within the underlying mantle at 2.72–2.70, 2.5–2.4 and 2.1–1.9 Ga (Dokukina et al., ; Mints et al., ; Skublov, Astaf'ev, et al., ; Skublov, Berezin et al, ; Stepanova et al., ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Since an Archean age (2.87–2.72 Ga) was ascribed to eclogites of the Belomorian Province (Mints et al., ; Volodichev, Slabunov, Bibikova, Konilov, & Kuzenko, ), the so‐called “oldest eclogite” has attracted much attention. Recently, two major eclogite types have been recognized in the Belomorian Province in the southwestern foreland of the Paleoproterozoic Lapland–Kola collisional orogeny (Figure a,b), the Salma and Gridino types (Balagansky et al, ; Dokukina et al., ; Li, Zhang, Wei & Slabunov, ; Liu et al., ; Mints, Dokukina, & Konilov, ; Mints et al., ; Perchuk & Morgunova, ). Compared with the Salma‐type eclogites, those in the Gridino area are more abundant and less retrogressed (Mints et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Age and P–T conditions of the Gridino‐type eclogite in the Belomorian Province, Russia

Zhang

Wei

et al. 2017

Journal Metamorphic Geology

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Although eclogites in the Belomorian Province have been regarded as Archean in age and among the oldest in the world, there are also multiple studies that have proposed a Paleoproterozoic age. Here, we present new data for the Gridino‐type eclogites, which occur as boudins and metamorphosed dykes within tonalite–trondhjemite–granodiorite gneisses. Zircon from these eclogites has core and rim structures. The cores display high Th/U ratios (0.18–0.45), negative Eu anomalies and strong enrichment in HREE, and have Neoarchean U–Pb ages of c. 2.70 Ga; they are interpreted to be magmatic in origin. Zircon cores have δ18O of 5.64–6.07‰ suggesting the possibility of crystallization from evolved mantle‐derived magmas. In contrast, the rims, which include the eclogite facies minerals omphacite and garnet, are characterized by low Th/U ratios (<0.035) and flat HREE patterns, and yield U–Pb ages of c. 1.90 Ga; they are interpreted to be metamorphic in origin. Zircon rims have elevated δ18O of 6.23–6.80‰, which was acquired during eclogite facies metamorphism. Based on petrography and phase equilibria modelling, we recognize a prograde epidote amphibolite facies mineral assemblage, the peak eclogite facies mineral assemblage and a retrograde high‐P amphibolite facies mineral assemblage. The peak metamorphic conditions of 695–755°C at >18 kbar for the Gridino‐type eclogites suggest an apparent thermal gradient of <39–42°C/kbar for the Lapland–Kola collisional orogeny.

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Section: Introductionsupporting

confidence: 71%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Age and P–T conditions of the Gridino‐type eclogite in the Belomorian Province, Russia

Zhang

Wei

et al. 2017

Journal Metamorphic Geology

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“…Despite the occurrence of older and hotter eclogites or highpressure granulites 12,13 , it has been argued that the first appearance of low-temperature/high-pressure rocks during the Neoproterozoic marks the onset of modern plate tectonics dominated by the subduction of very cold slabs 14,15 . The lack of such cold geotherms along the subduction channel in the large pre-Neoproterozoic orogens (that is, Grenville Orogen) has been suggested to indicate a different tectonic regime more compatible with shallower and hotter subduction processes 15 .…”

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confidence: 99%

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

et al. 2014

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The deeply eroded West Gondwana Orogen is a major continental collision zone that exposes numerous occurrences of deeply subducted rocks, such as eclogites. The position of these eclogites marks the suture zone between colliding cratons, and the age of metamorphism constrains the transition from subduction-dominated tectonics to continental collision and mountain building. Here we investigate the metamorphic conditions and age of high-pressure and ultrahigh-pressure eclogites from Mali, Togo and NE-Brazil and demonstrate that continental subduction occurred within 20 million years over at least a 2,500-km-long section of the orogen during the Ediacaran. We consider this to be the earliest evidence of large-scale deep-continental subduction and consequent appearance of Himalayan-scale mountains in the geological record. The rise and subsequent erosion of such mountains in the Late Ediacaran is perfectly timed to deliver sediments and nutrients that are thought to have been necessary for the subsequent evolution of sustainable life on Earth.

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“…In the Gridino area, the Mesoarchean mafic dikes and fragments of mafic rocks within the TTG association underwent Mesoarcehan eclogitization. The Pale oproterozoic U-Pb SHRIMP II age (Center for Iso topic Research, Karpinskii Russian Geological Research Institute, St. Petersburg) was determined for zircon from a small series of superimposed quartz bearing metasomatic veinlets 0.5-3 cm thick in the eclogitized dike of olivine gabbronorites [9,10]. The formation of veinlets is related to the penetration of the high temperature water free Cl bearing acid fluid enriched in Th, U, and LREE through the metamor phosed gabbronorite dike [9,10].…”

mentioning

confidence: 99%

Experience of chemical Th-U-Pb chemical dating of zircon from metasomatic felsic veins of the Mridino area, Belomorian eclogite province

et al. 2015

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For the first time in Russia, the Th-U-Pb isochron and point ages of zircons with anomalous U, Th, Pb, Y, and REE contents were determined by chemical dating. Zircons were extracted from metasomatic veinlets, which cut the eclogitized dike of olivine gabbronorites. The Paleoproterozoic ages (~2400, 2100, and 1890 Ma) are quite consistent with the previously determined U-Pb SHRIMP II age of these zircons.

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Archaean to Palaeoproterozoic high-grade evolution of the Belomorian eclogite province in the Gridino area, Fennoscandian Shield: Geochronological evidence

Cited by 49 publications

References 62 publications

Age and P–T conditions of the Gridino‐type eclogite in the Belomorian Province, Russia

Age and P–T conditions of the Gridino‐type eclogite in the Belomorian Province, Russia

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

Experience of chemical Th-U-Pb chemical dating of zircon from metasomatic felsic veins of the Mridino area, Belomorian eclogite province

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