Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface

For the last 12 Myr the transitional virtual geomagnetic poles (VGPs) of different reversals lie close to two preferred and practically antipodal longitudinal paths. In spite of some controversies about these transitional paths, it has been pointed out that they are linked to geomagnetic phenomena....

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Autores principales:	Vizan, Haroldo, Van Zele, Maria Andrea
Publicado:	1995
Materias:	absolute reconstruction Africa non-dipolar fields Pangea transitional directions VGP paths volcanic rocks core/mantle boundary flux variation geomagnetic reversal Jurassic palaeomagnetism South Africa
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v39_n2_p177_Vizan http://hdl.handle.net/20.500.12110/paper_00393169_v39_n2_p177_Vizan
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00393169_v39_n2_p177_Vizan
record_format	dspace
spelling	paper:paper_00393169_v39_n2_p177_Vizan2023-06-08T15:03:24Z Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface Vizan, Haroldo Van Zele, Maria Andrea absolute reconstruction Africa non-dipolar fields Pangea transitional directions VGP paths volcanic rocks core/mantle boundary flux variation geomagnetic reversal Jurassic palaeomagnetism South Africa For the last 12 Myr the transitional virtual geomagnetic poles (VGPs) of different reversals lie close to two preferred and practically antipodal longitudinal paths. In spite of some controversies about these transitional paths, it has been pointed out that they are linked to geomagnetic phenomena. Jurassic transitional VGP paths are quite similar to those of the last 12 Myr. Paleomagnetic data recorded in Stormberg Lavas (195 ± 5 Ma) belonging to two sampling localities of South Africa have been rotated according to an absolute palaeoreconstruction of Africa for the lower Jurassic. In order to avoid the hypothesis about dipolarity implicit in the VGPs calculations, the transitional directions recorded in the lavas were compared with others that were simulated on the basis of a model that relates transitional fields to variations of flux on the Earth's core surface. They were quite similar. For both, recorded and simulated data, the VGPs showed similar paths. Similar conditions could thus have driven both late Cenozoic and Jurassic reversals. © 1995 StudiaGeo s.r.o. Fil:Vizan, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Van Zele, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1995 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v39_n2_p177_Vizan http://hdl.handle.net/20.500.12110/paper_00393169_v39_n2_p177_Vizan
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	absolute reconstruction Africa non-dipolar fields Pangea transitional directions VGP paths volcanic rocks core/mantle boundary flux variation geomagnetic reversal Jurassic palaeomagnetism South Africa
spellingShingle	absolute reconstruction Africa non-dipolar fields Pangea transitional directions VGP paths volcanic rocks core/mantle boundary flux variation geomagnetic reversal Jurassic palaeomagnetism South Africa Vizan, Haroldo Van Zele, Maria Andrea Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
topic_facet	absolute reconstruction Africa non-dipolar fields Pangea transitional directions VGP paths volcanic rocks core/mantle boundary flux variation geomagnetic reversal Jurassic palaeomagnetism South Africa
description	For the last 12 Myr the transitional virtual geomagnetic poles (VGPs) of different reversals lie close to two preferred and practically antipodal longitudinal paths. In spite of some controversies about these transitional paths, it has been pointed out that they are linked to geomagnetic phenomena. Jurassic transitional VGP paths are quite similar to those of the last 12 Myr. Paleomagnetic data recorded in Stormberg Lavas (195 ± 5 Ma) belonging to two sampling localities of South Africa have been rotated according to an absolute palaeoreconstruction of Africa for the lower Jurassic. In order to avoid the hypothesis about dipolarity implicit in the VGPs calculations, the transitional directions recorded in the lavas were compared with others that were simulated on the basis of a model that relates transitional fields to variations of flux on the Earth's core surface. They were quite similar. For both, recorded and simulated data, the VGPs showed similar paths. Similar conditions could thus have driven both late Cenozoic and Jurassic reversals. © 1995 StudiaGeo s.r.o.
author	Vizan, Haroldo Van Zele, Maria Andrea
author_facet	Vizan, Haroldo Van Zele, Maria Andrea
author_sort	Vizan, Haroldo
title	Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
title_short	Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
title_full	Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
title_fullStr	Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
title_full_unstemmed	Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
title_sort	analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface
publishDate	1995
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v39_n2_p177_Vizan http://hdl.handle.net/20.500.12110/paper_00393169_v39_n2_p177_Vizan
work_keys_str_mv	AT vizanharoldo analysisofalowerjurassicgeomagneticreversalbasedonamodelthatrelatestransitionalfieldstovariationsoffluxonthecoresurface AT vanzelemariaandrea analysisofalowerjurassicgeomagneticreversalbasedonamodelthatrelatestransitionalfieldstovariationsoffluxonthecoresurface
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Analysis of a lower jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface

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