Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features
We report major and trace element concentrations, along with Nd isotope compositions, for Late Mesoproterozoic to Early Neoproterozoic dolerite sills from the Sette-Daban ridge (southern Verkhoyansk, south-east Siberia). Based on their major element composition, all rocks correspond to low-Ti (<3...
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MDPI AG
2020
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ftdoajarticles:oai:doaj.org/article:816fde32f7e34c0a94c42aed8b419730 2023-05-15T18:45:07+02:00 Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features Aleksandr D. Savelev Sergey V. Malyshev Valery M. Savatenkov Daniil D. Ignatov Anastasia D. Kuzkina 2020-09-01T00:00:00Z https://doi.org/10.3390/min10090805 https://doaj.org/article/816fde32f7e34c0a94c42aed8b419730 EN eng MDPI AG https://www.mdpi.com/2075-163X/10/9/805 https://doaj.org/toc/2075-163X doi:10.3390/min10090805 2075-163X https://doaj.org/article/816fde32f7e34c0a94c42aed8b419730 Minerals, Vol 10, Iss 805, p 805 (2020) South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle Mineralogy QE351-399.2 article 2020 ftdoajarticles https://doi.org/10.3390/min10090805 2022-12-31T02:11:38Z We report major and trace element concentrations, along with Nd isotope compositions, for Late Mesoproterozoic to Early Neoproterozoic dolerite sills from the Sette-Daban ridge (southern Verkhoyansk, south-east Siberia). Based on their major element composition, all rocks correspond to low-Ti (<3 wt% TiO 2 ) moderately alkaline basalts. The intrusions can be subdivided into two groups based on their trace element compositions. One group includes sills mainly distributed in the southern part of the study area (Yudoma group), with mid-ocean ridge basalt (MORB) trace element patterns enriched in aqueous fluid mobile incompatible (FMI) elements (Sr, Pb, Ba, U). The second group includes sills mostly distributed in the northern part of the study area, enriched in immobile incompatible (II) elements (Th, Nb, light rare earth elements (LREE)) and to a lesser extent, in aqueous fluid mobile elements. The Nd isotope signatures of the dolerites characterize a depleted mantle source, with a small enrichment from recycled continental crust. The geochemical characteristics of these igneous rocks are analogous to low-Ti basalts of large intraplate provinces (e.g., the Karoo and Siberian Traps). We propose that they formed by rifting-induced melting of the heterogeneous metasomatized shallow spinel-bearing mantle zone. We suggest that two different melting sources were involved in the generation of the two geochemically distinct sill groups, including the addition of two different subduction components. The southern sills were formed by melting of depleted lithospheric mantle enriched with FMI elements, corresponding to subduction-induced metasomatic alteration by fluids at shallow depths. The northern dolerites were formed by melting of depleted lithospheric mantle enriched with II elements, associated with the melting of subducted sediments at deeper depths. Article in Journal/Newspaper Yakutia Siberia Directory of Open Access Journals: DOAJ Articles Verkhoyansk ENVELOPE(133.400,133.400,67.544,67.544) Yudoma ENVELOPE(135.244,135.244,59.165,59.165) Minerals 10 9 805 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle Mineralogy QE351-399.2 |
spellingShingle |
South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle Mineralogy QE351-399.2 Aleksandr D. Savelev Sergey V. Malyshev Valery M. Savatenkov Daniil D. Ignatov Anastasia D. Kuzkina Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
topic_facet |
South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle Mineralogy QE351-399.2 |
description |
We report major and trace element concentrations, along with Nd isotope compositions, for Late Mesoproterozoic to Early Neoproterozoic dolerite sills from the Sette-Daban ridge (southern Verkhoyansk, south-east Siberia). Based on their major element composition, all rocks correspond to low-Ti (<3 wt% TiO 2 ) moderately alkaline basalts. The intrusions can be subdivided into two groups based on their trace element compositions. One group includes sills mainly distributed in the southern part of the study area (Yudoma group), with mid-ocean ridge basalt (MORB) trace element patterns enriched in aqueous fluid mobile incompatible (FMI) elements (Sr, Pb, Ba, U). The second group includes sills mostly distributed in the northern part of the study area, enriched in immobile incompatible (II) elements (Th, Nb, light rare earth elements (LREE)) and to a lesser extent, in aqueous fluid mobile elements. The Nd isotope signatures of the dolerites characterize a depleted mantle source, with a small enrichment from recycled continental crust. The geochemical characteristics of these igneous rocks are analogous to low-Ti basalts of large intraplate provinces (e.g., the Karoo and Siberian Traps). We propose that they formed by rifting-induced melting of the heterogeneous metasomatized shallow spinel-bearing mantle zone. We suggest that two different melting sources were involved in the generation of the two geochemically distinct sill groups, including the addition of two different subduction components. The southern sills were formed by melting of depleted lithospheric mantle enriched with FMI elements, corresponding to subduction-induced metasomatic alteration by fluids at shallow depths. The northern dolerites were formed by melting of depleted lithospheric mantle enriched with II elements, associated with the melting of subducted sediments at deeper depths. |
format |
Article in Journal/Newspaper |
author |
Aleksandr D. Savelev Sergey V. Malyshev Valery M. Savatenkov Daniil D. Ignatov Anastasia D. Kuzkina |
author_facet |
Aleksandr D. Savelev Sergey V. Malyshev Valery M. Savatenkov Daniil D. Ignatov Anastasia D. Kuzkina |
author_sort |
Aleksandr D. Savelev |
title |
Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
title_short |
Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
title_full |
Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
title_fullStr |
Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
title_full_unstemmed |
Meso-Neoproterozoic Mafic Sills along the South-Eastern Margin of the Siberian Craton, SE Yakutia: Petrogenesis, Tectonic and Geochemical Features |
title_sort |
meso-neoproterozoic mafic sills along the south-eastern margin of the siberian craton, se yakutia: petrogenesis, tectonic and geochemical features |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10090805 https://doaj.org/article/816fde32f7e34c0a94c42aed8b419730 |
long_lat |
ENVELOPE(133.400,133.400,67.544,67.544) ENVELOPE(135.244,135.244,59.165,59.165) |
geographic |
Verkhoyansk Yudoma |
geographic_facet |
Verkhoyansk Yudoma |
genre |
Yakutia Siberia |
genre_facet |
Yakutia Siberia |
op_source |
Minerals, Vol 10, Iss 805, p 805 (2020) |
op_relation |
https://www.mdpi.com/2075-163X/10/9/805 https://doaj.org/toc/2075-163X doi:10.3390/min10090805 2075-163X https://doaj.org/article/816fde32f7e34c0a94c42aed8b419730 |
op_doi |
https://doi.org/10.3390/min10090805 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
9 |
container_start_page |
805 |
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1766236088507039744 |