Lithospheric thermal structure in the Baltic shield
Steady-state heat conduction modelling was carried out to calculate the crustal temperature field and thermal lithosphere thickness in the Baltic shield. The radiogenic sources at the surface were fixed depending on the age of the crust. Below the uppermost 10 kilometres, a relationship between heat...
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1991
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fthighwire:oai:open-archive.highwire.org:gji:106/3/611 2023-05-15T17:05:02+02:00 Lithospheric thermal structure in the Baltic shield Pasquale, V. Verdoya, M. Chiozzi, P. 1991-09-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/106/3/611 https://doi.org/10.1111/j.1365-246X.1991.tb06333.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/106/3/611 http://dx.doi.org/10.1111/j.1365-246X.1991.tb06333.x Copyright (C) 1991, Oxford University Press Articles TEXT 1991 fthighwire https://doi.org/10.1111/j.1365-246X.1991.tb06333.x 2015-02-28T18:14:20Z Steady-state heat conduction modelling was carried out to calculate the crustal temperature field and thermal lithosphere thickness in the Baltic shield. The radiogenic sources at the surface were fixed depending on the age of the crust. Below the uppermost 10 kilometres, a relationship between heat generation and P -wave velocity was applied and seismic structure was used to define individual crustal blocks of specific thermal parameters. Small-scale surface heat-flow density anomalies are interpreted as lateral variations of heat generation within the upper part of the crust, whereas the large anomaly in the southern part of the shield is attributed to an anomalously high mantle heat-flow density. The results are shown on maps outlining mantle heat-flow density, Moho temperature and thermal lithosphere thickness. A relationship between subcrustal temperature and Moho depth was found, except for southern Sweden. The lithospheric thickness is found to exceed 200 km in the Bothnian Gulf-northern-central Finland and part of the Kola peninsula, where temperatures at the Moho are less than 500 °C; the temperature gradient at the top of the mantle has, on the average, a value of 7.5 mK m−1 and the mantle heat-flow density varies from 19 to 25 mW m−2. Towards the south, the lithospheric thickness decreases until it attains a value lower than 100 km under southern Sweden. In this latter area, the Moho temperature and mantle heat-flow density are remarkably high, 700°–900°C and 30–45 mW m−2, respectively, as well as the temperature gradient, which amounts to 10 mK m−1. Text kola peninsula HighWire Press (Stanford University) Kola Peninsula Geophysical Journal International 106 3 611 620 |
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English |
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Articles Pasquale, V. Verdoya, M. Chiozzi, P. Lithospheric thermal structure in the Baltic shield |
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description |
Steady-state heat conduction modelling was carried out to calculate the crustal temperature field and thermal lithosphere thickness in the Baltic shield. The radiogenic sources at the surface were fixed depending on the age of the crust. Below the uppermost 10 kilometres, a relationship between heat generation and P -wave velocity was applied and seismic structure was used to define individual crustal blocks of specific thermal parameters. Small-scale surface heat-flow density anomalies are interpreted as lateral variations of heat generation within the upper part of the crust, whereas the large anomaly in the southern part of the shield is attributed to an anomalously high mantle heat-flow density. The results are shown on maps outlining mantle heat-flow density, Moho temperature and thermal lithosphere thickness. A relationship between subcrustal temperature and Moho depth was found, except for southern Sweden. The lithospheric thickness is found to exceed 200 km in the Bothnian Gulf-northern-central Finland and part of the Kola peninsula, where temperatures at the Moho are less than 500 °C; the temperature gradient at the top of the mantle has, on the average, a value of 7.5 mK m−1 and the mantle heat-flow density varies from 19 to 25 mW m−2. Towards the south, the lithospheric thickness decreases until it attains a value lower than 100 km under southern Sweden. In this latter area, the Moho temperature and mantle heat-flow density are remarkably high, 700°–900°C and 30–45 mW m−2, respectively, as well as the temperature gradient, which amounts to 10 mK m−1. |
format |
Text |
author |
Pasquale, V. Verdoya, M. Chiozzi, P. |
author_facet |
Pasquale, V. Verdoya, M. Chiozzi, P. |
author_sort |
Pasquale, V. |
title |
Lithospheric thermal structure in the Baltic shield |
title_short |
Lithospheric thermal structure in the Baltic shield |
title_full |
Lithospheric thermal structure in the Baltic shield |
title_fullStr |
Lithospheric thermal structure in the Baltic shield |
title_full_unstemmed |
Lithospheric thermal structure in the Baltic shield |
title_sort |
lithospheric thermal structure in the baltic shield |
publisher |
Oxford University Press |
publishDate |
1991 |
url |
http://gji.oxfordjournals.org/cgi/content/short/106/3/611 https://doi.org/10.1111/j.1365-246X.1991.tb06333.x |
geographic |
Kola Peninsula |
geographic_facet |
Kola Peninsula |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/106/3/611 http://dx.doi.org/10.1111/j.1365-246X.1991.tb06333.x |
op_rights |
Copyright (C) 1991, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1991.tb06333.x |
container_title |
Geophysical Journal International |
container_volume |
106 |
container_issue |
3 |
container_start_page |
611 |
op_container_end_page |
620 |
_version_ |
1766059408481058816 |