Texture and fabric studies across the Kishorn Nappe, near Kyle of Lochalsh, Western Scotland

Coward, M. P.; Whalley, John

doi:10.1016/0191-8141(79)90001-4

Cited by 30 publications

(22 citation statements)

References 13 publications

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“…Hence an inverted stacking sequence may be generated by late movement of thrusts climbing from a lower structural level. This problem of stacking sequence is discussed by Coward (1980) and in more detail by Barber et al (in prep).…”

Section: St Sole Thmustmentioning

confidence: 96%

“…Above this, allochthonous 'Laxfordian' type Lewisian carries a cover of (Coward 1980 in press), which thrust Lewisian on top of Lewisian.…”

Section: And IV the Rocks Above The Arnaboll Thrustmentioning

confidence: 98%

“…The structure of Kishorn Nappe has been described by Coward & Whalley (1980). It is floored by a thrust which slices through the underlying imbricated Cambrian and 'Torridonian'.…”

Section: Lochalsh and Skyementioning

confidence: 99%

“…The purpose of this review is to emphasize current studies and interpretations (Elliot & Johnson in press) of the thrust belt itself. This paper was initially prepared as a guide for the postconference field trip (Coward & McClay 1979) and has since benefited greatly from discussions with field trip participants.…”

mentioning

confidence: 99%

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The Moine Thrust Zone: an overview

McClay

Coward

1981

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Summary The geometry of structures within the Moine Thrust Zone are similar to those found in classic thin-skinned tectonic regimes such as the southern Canadian Rocky Mountains. The deformation style and strain patterns along the strike of the Moine Thrust Zone are controlled by the position of the floor (or Sole) thrust. The stacking sequence of thrust nappes is from E to W in the direction of transport. Reactivation of some thrusts has caused reversals in the stacking sequence. The mylonites associated with the Moine Thrust have undergone a long and complex history of progressive deformation. Detailed descriptions of the Moine Thrust Zone at Loch Eriboll are given and the relationships of the Moine Thrust Zone to other major Caledonian tectonic features of the NW Highlands are discussed.

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Section: St Sole Thmustmentioning

confidence: 96%

“…Above this, allochthonous 'Laxfordian' type Lewisian carries a cover of (Coward 1980 in press), which thrust Lewisian on top of Lewisian.…”

Section: And IV the Rocks Above The Arnaboll Thrustmentioning

confidence: 98%

“…The structure of Kishorn Nappe has been described by Coward & Whalley (1980). It is floored by a thrust which slices through the underlying imbricated Cambrian and 'Torridonian'.…”

Section: Lochalsh and Skyementioning

confidence: 99%

mentioning

confidence: 99%

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The Moine Thrust Zone: an overview

McClay

Coward

1981

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“…minerals to be the primary cause for the observed magnetic fabrics in fine-grained siliciclastic metasedimentary rocks (Graham, 1954;Rees, 1961;Fuller, 1964), Fe-bearing phyllosilicates often are the main magnetic carriers contributing to the magnetic fabric (e.g. Coward and Whalley, 1979;Borradaile et al, 1986;Rochette, 1987). For Fe-bearing phyllosilicates, it was found that the degree of intrinsic magnetocrystalline anisotropy (P J ) does not exceed 1.35 (Beausoleil et al, 1983;Borradaile et al, 1987;Zapletal, 1990;Borradaile and Werner, 1994;Martín-Hernandez and Hirt, 2003) (see Table 1 for definition of the AMS parameters used in this work).…”

Section: Introductionmentioning

confidence: 99%

Preferred mineral orientation of a chloritoid-bearing slate in relation to its magnetic fabric

Haerinck

Wenk

Debacker³

et al. 2015

Journal of Structural Geology

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a b s t r a c tA regional analysis of the anisotropy of the magnetic susceptibility on low-grade metamorphic, chloritoid-bearing slates of the Paleozoic in Central Armorica (Brittany, France) revealed very high values for the degree of anisotropy (up to 1.43). Nonetheless, high-field torque magnetometry indicates that the magnetic fabric is dominantly paramagnetic. Chloritoid's intrinsic degree of anisotropy of 1.47 ± 0.06, suggests that chloritoid-bearing slates can have a high degree of anisotropy without the need of invoking a significant contribution of strongly anisotropic ferromagnetic (s.l.) minerals. To validate this assumption we performed a texture analysis on a representative sample of the chloritoid-bearing slates using hard Xray synchrotron diffraction. The preferred orientation patterns of both muscovite and chloritoid are extremely strong (~38.6 m.r.d. for muscovite, 20.9 m.r.d. for chloritoid) and display roughly axial symmetry about the minimum magnetic susceptibility axis, indeed suggesting that chloritoid may have a profound impact on the magnetic fabric of chloritoid-bearing rocks. However, modeling the anisotropy of magnetic susceptibility by averaging single crystal properties indicates that the CPO of chloritoid only partially explains the slate's anisotropy.

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Magnetic anisotropy of chloritoid

Haerinck

Debacker²,

Sintubin

2013

JGR Solid Earth

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[1] The magnetocrystalline anisotropy of monoclinic chloritoid, a relatively common mineral in aluminum-rich, metapelitic rocks, has been determined for the first time by measuring the high-field anisotropy of magnetic susceptibility (HF-AMS), using two independent approaches, i.e., (a) directional magnetic hysteresis measurements and (b) torque magnetometry, on a collection of single crystals collected from different tectonometamorphic settings worldwide. Magnetic remanence experiments show that all specimens contain ferromagnetic (s.l.) impurities, being mainly magnetite. The determined HF-AMS ellipsoids have a highly oblate shape with the minimum susceptibility direction subparallel to the crystallographic c-axis of chloritoid. In the basal plane of chloritoid, though the HF-AMS can be considered isotropic. The degree of anisotropy is found to be 1.47, which is significantly higher than the anisotropy of most paramagnetic silicates and even well above the frequently used upper limit (i.e., 1.35) for the paramagnetic contribution to the AMS of siliciclastic rocks. The obtained values for the paramagnetic Curie temperature parallel (θ ∥ ) and perpendicular (θ ⊥ ) to the basal plane indicate that this pronounced magnetocrystalline anisotropy is related to strong antiferromagnetic exchange interactions in the direction of the crystallographic c-axis (θ ⊥ < 0) and rather weak ferromagnetic exchange interactions within the basal plane (θ ∥ > 0). As a consequence, chloritoid-bearing metapelites with a pronounced mineral alignment can have a high degree of anisotropy without the need of invoking a significant contribution of strongly anisotropic, ferromagnetic (s.l.) minerals. The newly discovered magnetocrystalline anisotropy of chloritoid thus calls for a revised approach of magnetic fabric interpretations in chloritoid-bearing rocks.

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Texture and fabric studies across the Kishorn Nappe, near Kyle of Lochalsh, Western Scotland

Cited by 30 publications

References 13 publications

The Moine Thrust Zone: an overview

The Moine Thrust Zone: an overview

Preferred mineral orientation of a chloritoid-bearing slate in relation to its magnetic fabric

Magnetic anisotropy of chloritoid

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