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Titolo:
Is this magnetic fabric normal? A review and case studies in volcanic formations
Autore:
Rochette, P; Aubourg, C; Perrin, M;
Indirizzi:
Univ Aix Marseille 3, CEREGE, F-13545 Aix En Provence 4, France Univ Aix Marseille 3 Aix En Provence France 4 Aix En Provence 4, France Univ Cergy Pontoise, Dept Sci Terre, F-95031 Cergy, France Univ Cergy Pontoise Cergy France F-95031 ci Terre, F-95031 Cergy, France Univ Montpellier 2, Lab Geophys & Tecton, F-34095 Montpellier 5, France Univ Montpellier 2 Montpellier France 5 n, F-34095 Montpellier 5, France
Titolo Testata:
TECTONOPHYSICS
fascicolo: 1-2, volume: 307, anno: 1999,
pagine: 219 - 234
SICI:
0040-1951(19990625)307:1-2<219:ITMFNA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGMA FLOW; DISTRIBUTION ANISOTROPY; SUSCEPTIBILITY ANISOTROPY; NORTHEAST BRAZIL; SOUTHERN YEMEN; DYKE SWARM; ROCKS; FIELD; DIRECTION; AMS;
Keywords:
anisotropy; magnetic susceptibility; petrofabric; magma flow;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Rochette, P Univ Aix Marseille 3, CEREGE, Arbois BP 80, F-13545 Aix En Provence 4, France Univ Aix Marseille 3 Arbois BP 80 Aix En Provence France 4ce
Citazione:
P. Rochette et al., "Is this magnetic fabric normal? A review and case studies in volcanic formations", TECTONOPHYS, 307(1-2), 1999, pp. 219-234

Abstract

When studying weakly anisotropic rocks non-standard relationships between magnetic and expected petrofabric axes are sometimes observed, in particular the so-called inverse or intermediate fabrics. A review of possible explanations for these effects is presented and leads to the conclusion that a majority of abnormal magnetic fabrics, often encountered in magnetite-rich volcanic rocks, are due to abnormal preferred orientations or distributions of magnetite grains. Through case studies in dikes (from Skye Island, Yemenand the Iberian Peninsula), and magma and ash flows (from the Ethiopian traps and southern Corsica) the various possible origins of such fabrics are examined. It is possible to retrieve reliable magma flow directions from these sites provided proper data selection is performed, leading to non-unique interpretations. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 19:06:51