Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia)
A paleomagnetic reconnaissance has been carried out on the Grupo Diabásico of the western Cordillera from the Colombian Andes, between El Tambo and El Penol, Departamento Nariño. The Grupo Diabásico wich is of Cretaceous age is thought to be of submarine origin and to have undergone a low grade meta...
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ftunivgeneve:oai:unige.ch:unige:151935 2023-05-15T16:19:39+02:00 Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) Espinosa, Armando Hedley, Ian George Wagner, Jean-Jacques 1986 https://archive-ouverte.unige.ch/unige:151935 eng eng unige:151935 https://archive-ouverte.unige.ch/unige:151935 info:eu-repo/semantics/openAccess ISSN: 0072-0992 Geologia Colombiana, Vol. 15 (1986) pp. 149-153 info:eu-repo/classification/ddc/550 Paléomagnétisme Colombie Diabases Text info:eu-repo/semantics/article Article scientifique info:eu-repo/semantics/publishedVersion 1986 ftunivgeneve 2022-02-08T22:31:07Z A paleomagnetic reconnaissance has been carried out on the Grupo Diabásico of the western Cordillera from the Colombian Andes, between El Tambo and El Penol, Departamento Nariño. The Grupo Diabásico wich is of Cretaceous age is thought to be of submarine origin and to have undergone a low grade metamorphism. The geometric mean of the natural remanent magnetization JNRM = 8.8 x 10⁻⁵ G. The low field magnetic susceptibility geometric mean X= 8.87 x 10⁻⁴ G/Oe gives a Koenigsberger ratio of 0.28 indicating that the dominant magnetization is a induced one. Some pilot samples have been progressively demagnetized by alternating fields up to 600 O°. A viscous remanence test was applied to reject unstable sample. Despite the non ideal quality of the remanent magnetization a virtual geomagnetic pole has been calculated: pole latitude: 65° S; pole longitude: 186° E. Article in Journal/Newspaper Geomagnetic Pole Université de Genève: Archive ouverte UNIGE |
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Open Polar |
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Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Paléomagnétisme Colombie Diabases |
spellingShingle |
info:eu-repo/classification/ddc/550 Paléomagnétisme Colombie Diabases Espinosa, Armando Hedley, Ian George Wagner, Jean-Jacques Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
topic_facet |
info:eu-repo/classification/ddc/550 Paléomagnétisme Colombie Diabases |
description |
A paleomagnetic reconnaissance has been carried out on the Grupo Diabásico of the western Cordillera from the Colombian Andes, between El Tambo and El Penol, Departamento Nariño. The Grupo Diabásico wich is of Cretaceous age is thought to be of submarine origin and to have undergone a low grade metamorphism. The geometric mean of the natural remanent magnetization JNRM = 8.8 x 10⁻⁵ G. The low field magnetic susceptibility geometric mean X= 8.87 x 10⁻⁴ G/Oe gives a Koenigsberger ratio of 0.28 indicating that the dominant magnetization is a induced one. Some pilot samples have been progressively demagnetized by alternating fields up to 600 O°. A viscous remanence test was applied to reject unstable sample. Despite the non ideal quality of the remanent magnetization a virtual geomagnetic pole has been calculated: pole latitude: 65° S; pole longitude: 186° E. |
format |
Article in Journal/Newspaper |
author |
Espinosa, Armando Hedley, Ian George Wagner, Jean-Jacques |
author_facet |
Espinosa, Armando Hedley, Ian George Wagner, Jean-Jacques |
author_sort |
Espinosa, Armando |
title |
Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
title_short |
Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
title_full |
Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
title_fullStr |
Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
title_full_unstemmed |
Paleomagnetic reconnaissance of the Grupo Diabasico Western Andes (Colombia) |
title_sort |
paleomagnetic reconnaissance of the grupo diabasico western andes (colombia) |
publishDate |
1986 |
url |
https://archive-ouverte.unige.ch/unige:151935 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
ISSN: 0072-0992 Geologia Colombiana, Vol. 15 (1986) pp. 149-153 |
op_relation |
unige:151935 https://archive-ouverte.unige.ch/unige:151935 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766006055820591104 |