Paleomagnetic reconnaissance of the grupo diábasico western andes (colombia) Report as inadecuate




Paleomagnetic reconnaissance of the grupo diábasico western andes (colombia) - Download this document for free, or read online. Document in PDF available to download.



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 10-4G-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., 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 10-4G-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.

Tipo de documento: Artículo - Article

Palabras clave: Geology, Earth Sciences, Paleomagnetic reconnaissance, Grupo Diabásico, Cretaceous, Koenigsberger ratio, Geología, Ciencias de la tierra, Geociencias, Paleomagnetic reconnaissance, Grupo Diabásico, Cretaceous, Koenigsberger ratio





Source: http://www.bdigital.unal.edu.co


Teaser



GEOLOGIA COLOMBIANA No.
15, 1986 pp.149-153 PALEOMAGNETIC RECONNAISSANCE OF THE GRUPO DIABASICO WESTERN ANDES (COLOMBIA) A.
ESPINOSA. I.
HEDLEY and J.J.
WAGNER I CONTENT Pagina SUMMARY 1.
INTRODUCTION 2.
LABORATORY PROCEDURES .,. 3.
NATURAL MAGNETIC PROPERTIES 4.
PALEOMAGNETIC RESULTS . 5.
BIBLIOGRAPHIC REFERENCES . 1) Department of Mineralogy, University . of Geneva 150 150 150 150 151 153 150 A ESPINOSA 1.
HEDLEY, J.
WAGNER· PALEOMAGNETIC RECONNAISSANCE . OF THE GRUPO DIABASICO, WESTERN ANDES (COLOMBIA) SUMMARY A paleomagnetic reconnaissance has been carried out on the Grupo Diabtisico of the western Cordillera {rom the Colombian Andes, between EI Tambo and EI Penol, Departamento Nariiio.
The Grupo Diabiisico 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 = 4 8.8 x 10 5 G.
The low field magnetic susceptibility geometric mean X= 8.87 x 10. G-Oe gives a Koenigsberger ratio of 0.28 indicating that the dominant magnetizetion is a induced one. Some pilot samples have been progressively demagnetized by alternating fields up to 6000°.
A viscous remanence test was applied to reject unstable sam· pie. Despite the non ideal quality of the remanent magnetization a virtual geomagnetic pole has been calculated: pole latitude: 65° S; pole longitude: 186° E. 1.
INTRODUCTION A paleomagnetic reconnaissance has been carried out on six sites of the Grupo Diabasico of the Western Cordillera from the Colombian Andes between EI Penol, Departamento Nariiio as one of us (A.E.) is carrying out a detailed petrological study in this area. The Grupo Diabasico which is of Cretaceous age is thought to be of submarine origin and to...






Related documents