Abstract
In the Limousin area, Variscan leucogranitic plutons are spatially associated with normal faults and major strike-slip shear zones that are a continuation of the South Armorican shear zone. Our study focuses on the large N-S-trending Millevaches granitic massif (Massif Central, France), and intends to highlight, through gravity modelling, structural and anisotropy of magnetic susceptibility (AMS), the massif structure at depth and to discuss the mode of emplacement of granites within a strike-slip tectonic context. The mica subfabric suggests that the magnetic foliations display a general NW-SE sub-horizontal pattern on both sides of the N-S Pradines dextral wrench fault zone that deforms the core of the massif on 5 km width. The magnetic lineation trend exhibits a sigmoïdal pattern, N-S in the Pradines fault zone and NW-SE on both sides of it, which are consistent with a dextral wrench component. The horizontal magnetic foliations and lineations are consistent with the thin granite laccolith model. There is no significant imprint of the extensional Variscan belt collapse on the internal fabric of Millevaches granites than the tectonic dextral transcurrent movement prevailing in this area. © 2005 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.jsg.2005.05.021
Publication Date
2006-01-01
Publication Title
Journal of Structural Geology
Volume
28
Issue
1
Publisher
Elsevier BV
ISSN
0191-8141
Embargo Period
2024-11-25
First Page
148
Last Page
169
Recommended Citation
Gébelin, A., Martelet, G., Chen, Y., Brunel, M., & Faure, M. (2006) 'Structure of late Variscan Millevaches leucogranite massif in the French Massif Central: AMS and gravity modelling results', Journal of Structural Geology, 28(1), pp. 148-169. Elsevier BV: Available at: https://doi.org/10.1016/j.jsg.2005.05.021
