BASALTS GEODYNAMICS AND MAGNETISM OF THE KNIPOVICH UNDERWATER RIDGE NORWAY -- GREENLAND BASIN
Rubrics: ORIGINAL ARTICLES
Authors:
1.
VNII "Okeanologia" Sankt-Petersburg, Russia
2.
VNII "Okeanologia" Sankt-Petersburg, Russia
3.
SPb branch of IZMIRAN, Sankt-Petersburg, Russia
4.
VNII "Okeanologia" Sankt-Petersburg, Russia
Type:
Article
Pages:
from 303
to 312
Status:
Published
Received:
25.02.2001
Accepted:
25.02.2001
Published:
25.02.2001
Language:
English
Keywords:
basalts, Knipovich underwater ridge, seismicity and earthquake.
Abstract (English):
Reported in this paper are the data for the topography of the Knipovich oceanic ridge, as well as for its seismicity and earthquake distribution. The anomalous magnetic field of this ridge is compared with that of the North Atlantic region. Also reported are the results of the laboratory studies of the chemical compositions of its basalts and their magnetic properties. The samples were collected in the rift valley of this ridge. Proceeding from the results of the simultaneous analyses of all geological and geophysical data, a conclusion was derived that the Knipovich Ridge had developed in the environments of oblique spreading dominated by its shear component. At the present time this ridge evolves under the conditions of its slow spreading. The specific chemical and magnetic properties of its basalts reflect the effect of the contamination of the sialic crust, characteristic of the early periods of Afar-type extension. Magma had been produced at low depth levels.
Reported in this paper are the data for the topography of the Knipovich oceanic ridge, as well as for its seismicity and earthquake distribution. The anomalous magnetic field of this ridge is compared with that of the North Atlantic region. Also reported are the results of the laboratory studies of the chemical compositions of its basalts and their magnetic properties. The samples were collected in the rift valley of this ridge. Proceeding from the results of the simultaneous analyses of all geological and geophysical data, a conclusion was derived that the Knipovich Ridge had developed in the environments of oblique spreading dominated by its shear component. At the present time this ridge evolves under the conditions of its slow spreading. The specific chemical and magnetic properties of its basalts reflect the effect of the contamination of the sialic crust, characteristic of the early periods of Afar-type extension. Magma had been produced at low depth levels.
Keywords:
basalts, Knipovich underwater ridge, seismicity and earthquake.
basalts, Knipovich underwater ridge, seismicity and earthquake.
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