New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events

For a long time, the thermal history of northeastern (NE) Fennoscandia in the Phanerozoic and Precambrian remained unknown, since no thermochronological studies were carried out within the Kola Peninsula area. Two years ago, we developed the first model of tectono-thermal evolution of the Kola Penin...

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Main Authors: Roman V. Veselovskiy, Róbert Arató, Tanya E. Bagdasaryan, Alexander V. Samsonov, Alexandra V. Stepanova, Andrey A. Arzamastsev, Mariya S. Myshenkova
Format: Article
Language:English
Published: MDPI AG 2020-12-01
Series:Minerals
Subjects:
Online Access:https://www.mdpi.com/2075-163X/10/12/1095
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spelling doaj-4412f70c46e74d44af4edb612c6cf5e52020-12-07T00:02:32ZengMDPI AGMinerals2075-163X2020-12-01101095109510.3390/min10121095New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic EventsRoman V. Veselovskiy0Róbert Arató1Tanya E. Bagdasaryan2Alexander V. Samsonov3Alexandra V. Stepanova4Andrey A. Arzamastsev5Mariya S. Myshenkova6Geological Faculty, Lomonosov Moscow State University, 119991 Moscow, RussiaIsotope Climatology and Environmental Research Centre, Institute for Nuclear Research, H-4001 Debrecen, HungaryGeological Faculty, Lomonosov Moscow State University, 119991 Moscow, RussiaInstitute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry, Russian Academy of Sciences, 119017 Moscow, RussiaInstitute of Geology, Karelian Research Centre, Russian Academy of Sciences, 185910 Petrozavodsk, RussiaInstitute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 199034 Saint Petersburg, RussiaGeological Faculty, Lomonosov Moscow State University, 119991 Moscow, RussiaFor a long time, the thermal history of northeastern (NE) Fennoscandia in the Phanerozoic and Precambrian remained unknown, since no thermochronological studies were carried out within the Kola Peninsula area. Two years ago, we developed the first model of tectono-thermal evolution of the Kola Peninsula territory for the last 1.9 Gyr using a set of newly obtained apatite fission-track (AFT) and Ar/Ar thermochronological data. However, the low-temperature history of the most ancient tectonic unit of the northeastern part of the Kola Peninsula—the Archean Murmansk craton—remained poorly constrained due to the lack of AFT data. In this paper, we present the first results of AFT studies of 14 samples representing intrusive and metamorphic Precambrian rocks, located within the Murmansk craton of NE Fennoscandia. AFT ages and track length distributions indicate a similar tectono-thermal evolution of Precambrian tectonic units in NE Fennoscandia over the last 300 Myr. The AFT ages are distributed between ca. 177 and ca. 384 Ma; their median value, ~293 Ma, confirms the presence of a previously identified hidden thermal event that took place at about 300 Ma. However, a detailed analysis of the AFT age distribution shows the presence of three statistically distinguishable age components: 180–190 Ma (C1), 290–320 Ma (C2) and 422 Ma (C3). We assume that the relatively young AFT ages of C1 may originate from apatite crystals with low thermal resistivity. Remarkably, this value coincides with the initial stage of the Barents Sea magmatic province activity during large-scale plume-lithospheric interaction, as well as with the assumed age of an enigmatic remagnetization event throughout the Kola Peninsula. C2 ages can be observed in both the gabbroic and non-gabbroic samples, whereas C3 ages can only be found in gabbro. It is supposed that C2 ages, similarly to the Central Kola terrane, correspond to a cooling event related to the denudation of a thick sedimentary cover, representing a continuation of the Caledonian foreland basin towards NE Fennoscandia. C3 ages may be associated with a thermal event corresponding to the Caledonian collisional orogeny.https://www.mdpi.com/2075-163X/10/12/1095apatite fission-track datingFennoscandiaKola Peninsulathermal historytectonicsPhanerozoic
collection DOAJ
language English
format Article
sources DOAJ
author Roman V. Veselovskiy
Róbert Arató
Tanya E. Bagdasaryan
Alexander V. Samsonov
Alexandra V. Stepanova
Andrey A. Arzamastsev
Mariya S. Myshenkova
spellingShingle Roman V. Veselovskiy
Róbert Arató
Tanya E. Bagdasaryan
Alexander V. Samsonov
Alexandra V. Stepanova
Andrey A. Arzamastsev
Mariya S. Myshenkova
New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
Minerals
apatite fission-track dating
Fennoscandia
Kola Peninsula
thermal history
tectonics
Phanerozoic
author_facet Roman V. Veselovskiy
Róbert Arató
Tanya E. Bagdasaryan
Alexander V. Samsonov
Alexandra V. Stepanova
Andrey A. Arzamastsev
Mariya S. Myshenkova
author_sort Roman V. Veselovskiy
title New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
title_short New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
title_full New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
title_fullStr New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
title_full_unstemmed New Apatite Fission-Track Data from the Murmansk Craton, NE Fennoscandia: An Echo of Hidden Thermotectonic Events
title_sort new apatite fission-track data from the murmansk craton, ne fennoscandia: an echo of hidden thermotectonic events
publisher MDPI AG
series Minerals
issn 2075-163X
publishDate 2020-12-01
description For a long time, the thermal history of northeastern (NE) Fennoscandia in the Phanerozoic and Precambrian remained unknown, since no thermochronological studies were carried out within the Kola Peninsula area. Two years ago, we developed the first model of tectono-thermal evolution of the Kola Peninsula territory for the last 1.9 Gyr using a set of newly obtained apatite fission-track (AFT) and Ar/Ar thermochronological data. However, the low-temperature history of the most ancient tectonic unit of the northeastern part of the Kola Peninsula—the Archean Murmansk craton—remained poorly constrained due to the lack of AFT data. In this paper, we present the first results of AFT studies of 14 samples representing intrusive and metamorphic Precambrian rocks, located within the Murmansk craton of NE Fennoscandia. AFT ages and track length distributions indicate a similar tectono-thermal evolution of Precambrian tectonic units in NE Fennoscandia over the last 300 Myr. The AFT ages are distributed between ca. 177 and ca. 384 Ma; their median value, ~293 Ma, confirms the presence of a previously identified hidden thermal event that took place at about 300 Ma. However, a detailed analysis of the AFT age distribution shows the presence of three statistically distinguishable age components: 180–190 Ma (C1), 290–320 Ma (C2) and 422 Ma (C3). We assume that the relatively young AFT ages of C1 may originate from apatite crystals with low thermal resistivity. Remarkably, this value coincides with the initial stage of the Barents Sea magmatic province activity during large-scale plume-lithospheric interaction, as well as with the assumed age of an enigmatic remagnetization event throughout the Kola Peninsula. C2 ages can be observed in both the gabbroic and non-gabbroic samples, whereas C3 ages can only be found in gabbro. It is supposed that C2 ages, similarly to the Central Kola terrane, correspond to a cooling event related to the denudation of a thick sedimentary cover, representing a continuation of the Caledonian foreland basin towards NE Fennoscandia. C3 ages may be associated with a thermal event corresponding to the Caledonian collisional orogeny.
topic apatite fission-track dating
Fennoscandia
Kola Peninsula
thermal history
tectonics
Phanerozoic
url https://www.mdpi.com/2075-163X/10/12/1095
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