Paleomagnetic record of a geomagnetic field reversal from late miocene mafic intrusions, southern nevada.
Science
; 266(5184): 412-6, 1994 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-17816684
ABSTRACT
Late Miocene (about 8.65 million years ago) mafic intrusions and lava flows along with remagnetized host rocks from Paiute Ridge, southern Nevada, provide a high-quality paleomagnetic record of a geomagnetic field reversal. These rocks yield thermoremanent magnetizations with declinations of 227 degrees to 310 degrees and inclinations of -7 degrees to 49 degrees , defining a reasonably continuous virtual geomagnetic pole path over west-central Pacific longitudes. Conductive cooling estimates for the intrusions suggest that this field transition, and mafic magmatism, lasted only a few hundred years. Because this record comes principally from intrusive rocks, rather than sediments or lavas, it is important in demonstrating the longitudinal confinement of the geomagnetic field during a reversal.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Science
Ano de publicação:
1994
Tipo de documento:
Article