Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3597
Título: Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation
Autor: Geoffroy, L.
Callot, J. P.
Aubourg, C.
Moreira, M.
Palavras-chave: Magmatic Flow
Susceptibility Anisotropy
Troods Ophiolite
Data: Jul-2002
Editora: Wiley- Blackwell
Citação: GEOFFROY. L.; CALLOT, J. P.; AUBOURG, C.; MOREIRA, M. - Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation. Terra Nova. ISSN 0954-4879. Vol. 14, nr. 3 (2002), p. 183-190.
Resumo: In basaltic dykes the magnetic lineation K1 (maximum magnetic susceptibility axis) is generally taken to indicate the flow direction during solidification of the magma. This assumption was tested in Tertiary basaltic dykes from Greenland displaying independent evidence of subhorizontal flow. The digital processing of microphotographs from thin sections cut in (K1, K2) planes yields the preferred linear orientation of plagioclase, which apparently marks the magma flow lineation. In up to 60% of cases, the angular separation between K1 and the assumed flow direction is greater than 45degrees. This suggests that the uncorroborated use of magnetic lineations in dykes is risky. A simple geometrical method is proposed to infer the flow vector from AMS in dykes based solely on magnetic foliations.
Peer review: yes
URI: http://hdl.handle.net/10400.21/3597
ISSN: 0954-4879
Versão do Editor: http://onlinelibrary.wiley.com/doi/10.1046/j.1365-3121.2002.00412.x/abstract;jsessionid=CDD08963809AFBBDAB2D9FD4EE6617DD.f04t04
Aparece nas colecções:ISEL - Física - Artigos

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