Evidence for non-coaxiality of ferrimagnetic and paramagnetic fabrics, developed during magma flow and cooling in a thick mafic dyke

Silva, Pedro Manuel de Almeida Carvalho da; Marques, Fernando O.; Machek, M.; Henry, B.; Hirt, A. M.; Roxerova, Z.; Madureira, P.; Vratislav, S.

http://hdl.handle.net/10400.21/4974

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Authors

Silva, Pedro Manuel de Almeida Carvalho da

Abstract(s)

A detailed analysis of fabrics of the chilled margin of a thick dolerite dyke (Foum Zguid dyke, Southern Morocco) was performed in order to better understand the development of sub-fabrics during dyke emplacement and cooling. AMS data were complemented with measurements of paramagnetic and ferrimagnetic fabrics (measured with high field torque magnetometer), neutron texture and microstructural analyses. The ferrimagnetic and AMS fabrics are similar, indicating that the ferrimagnetic minerals dominate the AMS signal. The paramagnetic fabric is different from the previous ones. Based on the crystallization timing of the different mineralogical phases, the paramagnetic fabric appears related to the upward flow, while the ferrimagnetic fabric rather reflects the late-stage of dyke emplacement and cooling stresses. (C) 2014 Elsevier B.V. All rights reserved.

Keywords

Paramagnetic Ferrimagnetic Fabrics Microstructures Dyke Emplacement Stress Field

URI

http://hdl.handle.net/10400.21/4974

Citation

SILVA, Pedro Manuel Fernandes Carvalho da; [et al] – Evidence for non-coaxiality of ferrimagnetic and paramagnetic fabrics, developed during magma flow and cooling in a thick mafic dyke. Tectonophysics. ISSN: 0040-1951. Vol. 629 (2014), pp. 155-164