The metamorphic evolution of Paleoproterozoic eclogites in Kuru-Vaara, northern Belomorian Province, Russia: Constraints from P-T pseudosections and zircon dating

Liu, Fenglin; Zhang, Lifei; Li, Xiaoli; Слабунов, А. И.; Wei, Chunjing; Bader, Thomas

doi:10.1016/j.precamres.2016.11.011

Cited by 37 publications

(44 citation statements)

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“…Recently, in another study of eclogites from the Kuru‐Vaara quarry, Liu et al. () reported ages of c . 1,896 Ma for overgrowth rims and new zircon grains, which they interpreted to date the eclogite facies metamorphism.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the zircon cores have higher Th/U ratios and steeply positive normalized HREE patterns that are interpreted as magmatic; this zircon yields Archean ages . Recently, in another study of eclogites from the Kuru-Vaara quarry, Liu et al (2017) reported ages of c. 1,896 Ma for overgrowth rims and new zircon grains, which they interpreted to date the eclogite facies metamorphism. Thus, we infer that the eclogite facies metamorphism in the Salma area was Paleoproterozoic, consistent with the eclogite facies event in the Gridino area.…”

Section: Zircon U-pb Agesmentioning

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%

“…Modified after H€ oltt€ as et al (2008). (c) Geological map of the Stolbikha Island and sample locations (modified after Li, Zhang, Wei, & Slabunov 2015) foreland of the Paleoproterozoic Lapland-Kola collisional orogeny (Figure 1a,b), the Salma and Gridino types (Balagansky et al, 2014;Dokukina et al, 2014;Li, Zhang, Wei & Slabunov, 2015;Liu et al, 2017;Mints et al, 2010;Perchuk & Morgunova, 2014). Compared with the Salma-type eclogites, those in the Gridino area are more abundant and less retrogressed .…”

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: Discussionmentioning

confidence: 99%

Section: Zircon U-pb Agesmentioning

confidence: 99%

Section: Introductionmentioning

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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“…We believe a more sophisticated examination should be undertaken, with focus on the petrology of pristine eclogite (sensu stricto), to derive more reliable P–T paths of their metamorphic evolution. For this work, we selected representative rock samples, a pristine eclogite, two moderately retrograded eclogites that contain omphacite relicts, and an intensely retrograded eclogitic rock (the apoeclogite of the Russian literature) from Shirokaya Salma (a subcomplex of the Salma Complex), which is less studied than the adjacent Uzkaya Salma and Kuru‐Vaara localities (see Konilov et al., ; Li, Yu, Zhang, Wei, & Bader, ; Liu et al., ; Mints, Belousova, et al., ; Mints, Konilov, et al., ; Mints et al., ; Shchipansky, Khodorevskaya, Konilov, & Slabunov, ; Shchipansky, Khodorevskaya, & Slabunov, ; Shchipansky & Slabunov, ).…”

Section: Introductionmentioning

confidence: 99%

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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The metamorphic evolution of Paleoproterozoic eclogites in Kuru-Vaara, northern Belomorian Province, Russia: Constraints from P-T pseudosections and zircon dating

Cited by 37 publications

References 69 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

Quartz and orthopyroxene exsolution lamellae in clinopyroxene and the metamorphic P–T path of Belomorian eclogites

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