Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia
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 wi...
Published in: | Journal of Metamorphic Geology |
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Online Access: | https://hdl.handle.net/20.500.11897/470696 https://doi.org/10.1111/jmg.12258 |
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ftpekinguniv:oai:localhost:20.500.11897/470696 2023-05-15T16:13:06+02:00 Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia Yu, H. L. Zhang, L. F. Wei, C. J. Li, X. L. Guo, J. H. Zhang, LF (reprint author), Peking Univ, MOE Key Lab Orogen Belt & Crustal Evolut, Sch Earth & Space Sci, Beijing, Peoples R China. Peking Univ, MOE Key Lab Orogen Belt & Crustal Evolut, Sch Earth & Space Sci, Beijing, Peoples R China. Inst Geol & Geophys CAS, State Key Lab Lithospher Evolut, Beijing, Peoples R China. 2017 https://hdl.handle.net/20.500.11897/470696 https://doi.org/10.1111/jmg.12258 en eng JOURNAL OF METAMORPHIC GEOLOGY JOURNAL OF METAMORPHIC GEOLOGY.2017,35(8),855-869. 1904717 0263-4929 http://hdl.handle.net/20.500.11897/470696 1525-1314 doi:10.1111/jmg.12258 WOS:000409033500002 SCI Gridino-type eclogite Paleoproterozoic phase equilibria modelling P-T path zircon U-Pb age STYLE PLATE-TECTONICS LAPLAND-KOLA OROGEN MOBILE BELT PALEOPROTEROZOIC ECLOGITES BALTIC SHIELD FENNOSCANDIAN SHIELD UHP METAMORPHISM THERMAL REGIMES ZIRCON EVOLUTION Journal 2017 ftpekinguniv https://doi.org/20.500.11897/470696 https://doi.org/10.1111/jmg.12258 2021-08-01T11:10:45Z 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. 2.70Ga; they are interpreted to be magmatic in origin. Zircon cores have O-18 of 5.64-6.07 parts per thousand 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. 1.90Ga; they are interpreted to be metamorphic in origin. Zircon rims have elevated O-18 of 6.23-6.80 parts per thousand, 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 degrees C at >18kbar for the Gridino-type eclogites suggest an apparent thermal gradient of <39-42 degrees C/kbar for the Lapland-Kola collisional orogeny. National Nature Science Foundation of China [41121062, 41172196, 41311120071] SCI(E) ARTICLE 8 855-869 35 Journal/Newspaper Fennoscandian Lapland Peking University Institutional Repository (PKU IR) Gridino ENVELOPE(34.675,34.675,65.923,65.923) Journal of Metamorphic Geology 35 8 855 869 |
institution |
Open Polar |
collection |
Peking University Institutional Repository (PKU IR) |
op_collection_id |
ftpekinguniv |
language |
English |
topic |
Gridino-type eclogite Paleoproterozoic phase equilibria modelling P-T path zircon U-Pb age STYLE PLATE-TECTONICS LAPLAND-KOLA OROGEN MOBILE BELT PALEOPROTEROZOIC ECLOGITES BALTIC SHIELD FENNOSCANDIAN SHIELD UHP METAMORPHISM THERMAL REGIMES ZIRCON EVOLUTION |
spellingShingle |
Gridino-type eclogite Paleoproterozoic phase equilibria modelling P-T path zircon U-Pb age STYLE PLATE-TECTONICS LAPLAND-KOLA OROGEN MOBILE BELT PALEOPROTEROZOIC ECLOGITES BALTIC SHIELD FENNOSCANDIAN SHIELD UHP METAMORPHISM THERMAL REGIMES ZIRCON EVOLUTION Yu, H. L. Zhang, L. F. Wei, C. J. Li, X. L. Guo, J. H. Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
topic_facet |
Gridino-type eclogite Paleoproterozoic phase equilibria modelling P-T path zircon U-Pb age STYLE PLATE-TECTONICS LAPLAND-KOLA OROGEN MOBILE BELT PALEOPROTEROZOIC ECLOGITES BALTIC SHIELD FENNOSCANDIAN SHIELD UHP METAMORPHISM THERMAL REGIMES ZIRCON EVOLUTION |
description |
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. 2.70Ga; they are interpreted to be magmatic in origin. Zircon cores have O-18 of 5.64-6.07 parts per thousand 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. 1.90Ga; they are interpreted to be metamorphic in origin. Zircon rims have elevated O-18 of 6.23-6.80 parts per thousand, 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 degrees C at >18kbar for the Gridino-type eclogites suggest an apparent thermal gradient of <39-42 degrees C/kbar for the Lapland-Kola collisional orogeny. National Nature Science Foundation of China [41121062, 41172196, 41311120071] SCI(E) ARTICLE 8 855-869 35 |
author2 |
Zhang, LF (reprint author), Peking Univ, MOE Key Lab Orogen Belt & Crustal Evolut, Sch Earth & Space Sci, Beijing, Peoples R China. Peking Univ, MOE Key Lab Orogen Belt & Crustal Evolut, Sch Earth & Space Sci, Beijing, Peoples R China. Inst Geol & Geophys CAS, State Key Lab Lithospher Evolut, Beijing, Peoples R China. |
format |
Journal/Newspaper |
author |
Yu, H. L. Zhang, L. F. Wei, C. J. Li, X. L. Guo, J. H. |
author_facet |
Yu, H. L. Zhang, L. F. Wei, C. J. Li, X. L. Guo, J. H. |
author_sort |
Yu, H. L. |
title |
Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
title_short |
Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
title_full |
Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
title_fullStr |
Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
title_full_unstemmed |
Age and P-T conditions of the Gridino-type eclogite in the Belomorian Province, Russia |
title_sort |
age and p-t conditions of the gridino-type eclogite in the belomorian province, russia |
publisher |
JOURNAL OF METAMORPHIC GEOLOGY |
publishDate |
2017 |
url |
https://hdl.handle.net/20.500.11897/470696 https://doi.org/10.1111/jmg.12258 |
long_lat |
ENVELOPE(34.675,34.675,65.923,65.923) |
geographic |
Gridino |
geographic_facet |
Gridino |
genre |
Fennoscandian Lapland |
genre_facet |
Fennoscandian Lapland |
op_source |
SCI |
op_relation |
JOURNAL OF METAMORPHIC GEOLOGY.2017,35(8),855-869. 1904717 0263-4929 http://hdl.handle.net/20.500.11897/470696 1525-1314 doi:10.1111/jmg.12258 WOS:000409033500002 |
op_doi |
https://doi.org/20.500.11897/470696 https://doi.org/10.1111/jmg.12258 |
container_title |
Journal of Metamorphic Geology |
container_volume |
35 |
container_issue |
8 |
container_start_page |
855 |
op_container_end_page |
869 |
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1765998709066170368 |