Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift?
The southern part of the Baltic Shield hosts a series of mafic dykes and sills of Mesoproterozoic ages, including a ca. 1.53–1.46 Ga sheet-like gabbro-dolerite sills and the Salmi plateau-basalts from the Lake Ladoga region. Based on chiefly geochemical data, the region is conventionally interpreted...
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Online Access: | https://oceanrep.geomar.de/id/eprint/26402/ https://oceanrep.geomar.de/id/eprint/26402/1/Artemieva%20et.al.pdf https://doi.org/10.1016/j.precamres.2014.08.011 |
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ftoceanrep:oai:oceanrep.geomar.de:26402 2023-05-15T16:12:07+02:00 Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? Artemieva, Irina M. Shulgin, Alexey 2015-04-01 text https://oceanrep.geomar.de/id/eprint/26402/ https://oceanrep.geomar.de/id/eprint/26402/1/Artemieva%20et.al.pdf https://doi.org/10.1016/j.precamres.2014.08.011 en eng Elsevier https://oceanrep.geomar.de/id/eprint/26402/1/Artemieva%20et.al.pdf Artemieva, I. M. and Shulgin, A. (2015) Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift?. Precambrian Research, 259 . pp. 34-42. DOI 10.1016/j.precamres.2014.08.011 <https://doi.org/10.1016/j.precamres.2014.08.011>. doi:10.1016/j.precamres.2014.08.011 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2015 ftoceanrep https://doi.org/10.1016/j.precamres.2014.08.011 2023-04-07T15:15:53Z The southern part of the Baltic Shield hosts a series of mafic dykes and sills of Mesoproterozoic ages, including a ca. 1.53–1.46 Ga sheet-like gabbro-dolerite sills and the Salmi plateau-basalts from the Lake Ladoga region. Based on chiefly geochemical data, the region is conventionally interpreted as an intracratonic Ladoga rift (graben). We question the validity of this geodynamic interpretation by analyzing regional geophysical data (crustal structure, heat flow, Bouguer gravity anomalies, magnetic anomalies, and mantle Vs velocities). We provide a complete list of tectonic, magmatic, and geophysical characteristics typical of continental rifts in general and demonstrate that, except for magmatic and, perhaps, some gravity signature, the Lake Ladoga region lacks any other rift features. We also compare the geophysical data from the Lake Ladoga region with similar in age Midcontinent and Valday rifts, and provide alternative explanations for Mesoproterozoic geodynamic evolution of the southern Baltic Shield. We propose that Mesoproterozoic mafic intrusions in southern Fennoscandia may be associated with a complex deformation pattern during reconfiguration of (a part of) Nuna (Columbia) supercontinent, which led to magma intrusions as a series of mafic dykes along lithosphere weakness zones and ponding of small magma pockets within the cratonic lithosphere. Consequent magma cooling and its partial transition to eclogite facies could have led to the formation of a series of basement depressions, similar to intracratonic basins of North America, while spatially heterogeneous thermo-chemical subsidence, with phase transitions locally speeded by the presence of (subduction-related) fluids, could have produced a series of faults bounding graben-like structures. Article in Journal/Newspaper Fennoscandia OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Valday ENVELOPE(35.513,35.513,63.429,63.429) Precambrian Research 259 34 42 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The southern part of the Baltic Shield hosts a series of mafic dykes and sills of Mesoproterozoic ages, including a ca. 1.53–1.46 Ga sheet-like gabbro-dolerite sills and the Salmi plateau-basalts from the Lake Ladoga region. Based on chiefly geochemical data, the region is conventionally interpreted as an intracratonic Ladoga rift (graben). We question the validity of this geodynamic interpretation by analyzing regional geophysical data (crustal structure, heat flow, Bouguer gravity anomalies, magnetic anomalies, and mantle Vs velocities). We provide a complete list of tectonic, magmatic, and geophysical characteristics typical of continental rifts in general and demonstrate that, except for magmatic and, perhaps, some gravity signature, the Lake Ladoga region lacks any other rift features. We also compare the geophysical data from the Lake Ladoga region with similar in age Midcontinent and Valday rifts, and provide alternative explanations for Mesoproterozoic geodynamic evolution of the southern Baltic Shield. We propose that Mesoproterozoic mafic intrusions in southern Fennoscandia may be associated with a complex deformation pattern during reconfiguration of (a part of) Nuna (Columbia) supercontinent, which led to magma intrusions as a series of mafic dykes along lithosphere weakness zones and ponding of small magma pockets within the cratonic lithosphere. Consequent magma cooling and its partial transition to eclogite facies could have led to the formation of a series of basement depressions, similar to intracratonic basins of North America, while spatially heterogeneous thermo-chemical subsidence, with phase transitions locally speeded by the presence of (subduction-related) fluids, could have produced a series of faults bounding graben-like structures. |
format |
Article in Journal/Newspaper |
author |
Artemieva, Irina M. Shulgin, Alexey |
spellingShingle |
Artemieva, Irina M. Shulgin, Alexey Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
author_facet |
Artemieva, Irina M. Shulgin, Alexey |
author_sort |
Artemieva, Irina M. |
title |
Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
title_short |
Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
title_full |
Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
title_fullStr |
Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
title_full_unstemmed |
Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift? |
title_sort |
is the proterozoic ladoga rift (se baltic shield) a rift? |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://oceanrep.geomar.de/id/eprint/26402/ https://oceanrep.geomar.de/id/eprint/26402/1/Artemieva%20et.al.pdf https://doi.org/10.1016/j.precamres.2014.08.011 |
long_lat |
ENVELOPE(35.513,35.513,63.429,63.429) |
geographic |
Valday |
geographic_facet |
Valday |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
https://oceanrep.geomar.de/id/eprint/26402/1/Artemieva%20et.al.pdf Artemieva, I. M. and Shulgin, A. (2015) Is the Proterozoic Ladoga Rift (SE Baltic Shield) a rift?. Precambrian Research, 259 . pp. 34-42. DOI 10.1016/j.precamres.2014.08.011 <https://doi.org/10.1016/j.precamres.2014.08.011>. doi:10.1016/j.precamres.2014.08.011 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.precamres.2014.08.011 |
container_title |
Precambrian Research |
container_volume |
259 |
container_start_page |
34 |
op_container_end_page |
42 |
_version_ |
1765997351738015744 |