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The geometric and kinematic development of the Emma Lake thrust stack, Grenville Front, southwestern Labrador
Abstract
The Emma Lake thrust stack is a duplex structure consisting of basement-cored fold nappes with thrust-through overturned limbs developed in greenschist-facies metamorphic rocks. Geometric relationships between fold nappes and thrust surfaces indicate both regular-sequence and out-of-sequence thrusting occurred during development of the thrust stack. Microstructural analysis shows that regular-sequence thrusts developed under ductile conditions, whereas out-of-sequence thrusts developed in a brittle–ductile field.The structural geometry and metamorphic grade of the Emma Lake thrust stack indicate that it developed under ductile conditions at upper midcrustal levels. The geometry of the Emma Lake thrust stack suggests that structural styles common to higher level fold and thrust belts may be traced into deeper levels of the crust.
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Alternative modes of displacement on such thrusts can lead to the formation of the basement-cored fold nappes observed locally, with one or more thin basement and cover sheets introduced into the thrust stack by shortcut faults.
“Alternative modes of displacement on such thrusts can lead to the formation of the basement-cored fold nappes observed locally (Figures 12b and 12c), with one or more thin basement and cover sheets introduced into the thrust stack by shortcut faults (Figure 12b after Brown et al. [1991]).”
From Grenville Front zone, Gagnon terrane, southwestern Labrador: Configuration of a midcrustal foreland fold‐thrust belt (2008) · cites this paper as Brown et al. [1991]
Formation of a basement-cored fold nappe is inferred to have developed by partial inversion of an extensional fault in the basement and undercutting of the footwall by shortcut faulting (domain I, Emma L., ~12 km W of Wabush L.).
“(c)Formation of a basement-cored fold nappe, inferred to have developed by partial inversion of an extensional fault in the basement and undercutting of the footwall by shortcut faulting (domain I, Emma L., $12 km W of Wabush L.)”
From Grenville Front zone, Gagnon terrane, southwestern Labrador: Configuration of a midcrustal foreland fold‐thrust belt (2008) · cites this paper as Brown et al., 1991
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van Gool, J. A. M., Rivers, T., & Calon, T. (2008) · Tectonics · doi:10.1029/2006tc002095 · Cited by 35
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Metadata
- Authors
- Brown, D., Gool, J. V., Calon, T., & Rivers, T.
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1991-01-01
- Volume
- 28
- Issue
- 1
- Pages
- 136-144
- ISSN
- 0008-4077
- 1480-3313
- Cited by
- 6
- References
- 0
- Language
- en
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