New data on the age (U-Pb, Sm-Nd) of garnetites from Salma eclogites of the Belomorian mobile belt

Мельник, А. Е.; Скублов, С. Г.; Marin, Yu. B.; Березин, А. В.; Богомолов, Е. С.

doi:10.1134/s1028334x13010133

Cited by 20 publications

(26 citation statements)

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“…In most cases, ancient (>2.0–1.9 Ga) high‐grade metamorphic terranes rarely preserve (pristine) eclogite—examples are the Hengshan granulite complex (North China Craton, 1.9–1.8 Ga, Zhao, Cawood, Wilde, & Lu, ), the Snowbird granulite–eclogite complex (Canada, 1.9 Ga, Baldwin, Bowring, & Williams, ), the Lapland granulite complex (Russia, 1.9 Ga, Daly et al., ) and the Ubendian/Usagaran eclogite‐bearing complex (Tanzania, 2.0–1.9 Ga, Collins, Reddy, Buchan, & Mruma, ). Overall, there are three scenarios invoked for the formation and evolution of the Belomorian eclogites (see Perchuk & Morgunova, ): scenario I, a single Mesoarchean eclogite facies metamorphism (Dokukina & Konilov, ; Dokukina et al., ; Mints, Belousova, et al., ; Mints, Konilov, et al., ); scenario II, at least two eclogite facies events in the Archean and the Palaeoproterozoic (Balagansky et al., ; Slabunov, Stepanova, Bibikova, Babarina, & Matukov, ; Slabunov, Volodichev, Skublov, & Berezin, ; Volodichev, Slabunov, Sibelev, Skublov, & Kuzenko, ); and, scenario III, a single Palaeoproterozoic eclogite facies metamorphism at 1.9 Ga (Herwartz, Skublov, Berezin, & Mel'nik, ; Mel'nik, Skublov, Marin, Berezin, & Bogomolov, ; Skublov, Berezin, & Mel'nik, ; Skublov et al., ; Travin & Kozlova, ). The Shirokaya Salma eclogites have previously been considered as having a Meso‐Neoarchean age (e.g.…”

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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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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“…This prograde metamorphism likely occurred ca. 1.92-1.88 Ga (Skublov et al, 2010a(Skublov et al, , 2011Herwartz et al, 2012;Mel'nik et al, 2013), as mentioned herein.…”

Section: P-t Path During Paleoproterozoic Metamorphismmentioning

confidence: 62%

“…Garnet in the analyzed eclogite records prograde zoning, with increasing pyrope contents from core to rim (Skublov et al, 2011). Studies of Lu-Hf and Sm-Nd garnet geochronology from the same eclogite yielded garnet-whole-rock isochron ages of 1901 ± 5 Ma and 1897 ± 16 Ma, respectively (Herwartz et al, 2012;Mel'nik et al, 2013). Although these ages were interpreted to reflect the timing of peak eclogite facies metamorphism, the Lu-Hf and Sm-Nd ages of garnets with growth zoning are generally interpreted to represent prograde metamorphic ages, due to the low diffusivities of REEs (Baxter and Scherer, 2013).…”

Section: Interpretation Of Paleoproterozoic Zircon Agesmentioning

confidence: 94%

“…Petrographic, geochemical, and geochronological data from the Salma eclogites in the Kola Peninsula reveal the polymetamorphic history of this area. The ages of the magmatic protoliths of the Salma eclogites are known to be 2.94-2.92 Ga (Kaulina et al, 2010) and 2.88-2.82 Ga (Mints et al, 2010;Skublov et al, 2010aSkublov et al, , 2011Mel'nik et al, 2013). However, the 2.88-2.87 Ga zircon age obtained from Skublov et al (2010aSkublov et al ( , 2011 should be interpreted as a metamorphic age, rather than as a magmatic age, because these zircons do not record zoning patterns that are typical for igneous zircons, such as concentric or banded zoning (Hoskin and Schaltegger, 2003); instead, they exhibit unzoned patterns, which are characteristic of metamorphic zircons.…”

Section: Meaning Of Archean Zircon Agesmentioning

confidence: 99%

“…1.92-1.88 Ga, low Th/U ratios, and flat heavy rare earth element (HREE) patterns. Lu-Hf and Sm-Grt ages (1.90-1.88 Ga) obtained from eclogite and eclogitized ultrabasite were also interpreted to reflect eclogite facies metamorphic ages (Skublov et al, 2010b;Herwartz et al, 2012;Mel'nik et al, 2013). However, garnet from massive eclogite (sample 46, Table 1) exhibits prograde zoning (Skublov et al, 2011), implying that these ages may represent prograde metamorphic ages rather than ages of peak metamorphism.…”

Section: Introductionmentioning

confidence: 98%

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Paleoproterozoic high-pressure metamorphic history of the Salma eclogite on the Kola Peninsula, Russia

Imayama

Балтыбаев

et al. 2017

Lithosphere

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The Precambrian Salma eclogites on the Kola Peninsula, Russia, represent some of the oldest eclogites in the world; however, there has been much debate regarding whether the timing of their eclogite facies metamorphism is Archean (2.72-2.70 Ga) or Paleoproterozoic (1.92-1.88 Ga). New microstructural observations, pressure-temperature (P-T) analyses, zircon inclusion analyses, and U-Pb zircon dating performed in this study suggest that eclogite facies metamorphism occurred at ca. 1.87 Ga under P-T conditions of 16-18 kbar and 750-770 °C. Metamorphic zircons with the age of 1.87 Ga have inclusions of garnet (Grt) + omphacite (Omp) + Ca-clinopyoxene (Cpx) + amphibole (Amp) + quartz (Qz) + rutile (Rt) ± biotite (Bt), as well as flat heavy rare earth element (HREE) patterns due to the presence of abundant amounts of garnet during peak eclogite facies metamorphism. The Paleoproterozoic ages (1.92-1.88 Ga) presented in previous studies are reinterpreted to represent prograde ages, rather than peak ages, because these ages have been inferred from U-Pb dating in zoisite-bearing zircon and Sm-Nd and Lu-Hf geochronologic analyses of garnet showing growth zoning. In contrast, the 2.73-2.72 Ga unzoned zircons with dark cathodoluminescence contain inclusions of Grt + Amp + plagioclase (Pl) + Qz + rutile (Rt) ± Bt and are relatively enriched in HREEs, suggesting that an initial amphibolite facies metamorphic event occurred during the Archean. This study also proposes that the Salma eclogites underwent granulite facies retrograde metamorphism at 10-14 kbar and 770-820 °C, with rapid decompression occurring soon after peak metamorphism ca. 1.87 Ga. The final period of retrograde amphibolite facies metamorphism occurred at 8-10 kbar and 590-610 °C. Whole-rock chemical analyses indicate that the Salma eclogites were originally tholeiitic basalts formed at a mid-ocean ridge. The occurrence of eclogite facies metamorphism ca. 1.87 Ga suggests that the collision between the Kola and Karelian continents occurred during the Paleoproterozoic, rather than the Archean. These results, as well as those of previous studies, imply that the subduction required to form eclogites may have begun during or before the Paleoproterozoic.

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Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula)

et al. 2020

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New data on the age (U-Pb, Sm-Nd) of garnetites from Salma eclogites of the Belomorian mobile belt

Cited by 20 publications

References 11 publications

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

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

Paleoproterozoic high-pressure metamorphic history of the Salma eclogite on the Kola Peninsula, Russia

Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula)

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