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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ftmdpi:oai:mdpi.com:/2075-163X/10/9/805/ 2023-08-20T04:10:20+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 agris 2020-09-12 application/pdf https://doi.org/10.3390/min10090805 EN eng Multidisciplinary Digital Publishing Institute Mineral Geochemistry and Geochronology https://dx.doi.org/10.3390/min10090805 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 10; Issue 9; Pages: 805 South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle Text 2020 ftmdpi https://doi.org/10.3390/min10090805 2023-08-01T00:06:10Z 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% TiO2) 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. Text Yakutia Siberia MDPI Open Access Publishing 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 |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle |
spellingShingle |
South-East Siberia Sette-Daban mafic rock sills geochemistry metasomatized mantle 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 |
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% TiO2) 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 |
Text |
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 |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10090805 |
op_coverage |
agris |
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; Volume 10; Issue 9; Pages: 805 |
op_relation |
Mineral Geochemistry and Geochronology https://dx.doi.org/10.3390/min10090805 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
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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1774724460829474816 |