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Machek, Matej
- Fabric Transpositions in Granite Plutons - An Insight from Non-Scaled Analogue Modelling
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Authors
Affiliations
1 Geophysical Institute, Czech Academy of Sciences, Bocni II/1401, 14131 Praha 4, CZ
2 Institute of Petrology and Structural Geology, Charles University, Prague, CZ
1 Geophysical Institute, Czech Academy of Sciences, Bocni II/1401, 14131 Praha 4, CZ
2 Institute of Petrology and Structural Geology, Charles University, Prague, CZ
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 267-277Abstract
Investigations on a set of experimental models of highly viscous intrusions were carried out in order to study the internal strain pattern during vertical ascent and emplacement of granite intrusions. The strain pattern was determined by means of anisotropy of magnetic susceptibility (AMS) resulting from the orientation of magnetite particles in a liquid plaster medium. The modelled intrusions show distinct fabrics reflecting the flow of a rheologically complex, non- Newtonian material. During the vertical growth of the intrusion, constrictional vertical fabrics are transposed into flattening fabrics, and along with the development of low-intensity fabric domains are passively transported upwards. Vertical growth takes place along subvertical thrust shear zones that satisfactorily explain the discordant magmatic fabrics in granites along intrusion sides. The resulting complex fabric patterns suggest that the vertical movement of material in ascending intrusions is accommodated by various flow mechanisms operating simultaneously.Keywords
Analogue Modelling, AMS, Magmatic Fabrics, Granite Intrusions, Rheology.
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