Crystallographic fabrics: a selective review of their applications to research in structural geology

Law, Richard D.

doi:10.1144/gsl.sp.1990.054.01.30

Cited by 184 publications

(176 citation statements)

References 110 publications

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“…350-400 °C, e.g. Law, 1990) is consistent with the metamorphic conditions. From the kinematic point of view, the fabric asymmetry showing top-to-the-south shearing is in good agreement with shear indicators, such as sigma-type porphyroclast systems observed in thin section.…”

Section: Evidence For An Earlier Ductile Compressional Deformation Evsupporting

confidence: 75%

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Triassic polyphase deformation in the Feidong-Zhangbaling Massif (eastern China) and its place in the collision between the North China and South China blocks

Lin

Faure

Wang

et al. 2005

Journal of Asian Earth Sciences

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The Feidong-Zhangbaling Massif is located between the Dabieshan and Sulu areas along the Tan-Lu fault in eastern China. Five tectonic-metamorphic events are distinguished there. The earliest deformation (D1) corresponds to a southward compression that occurred during subduction of the South China Block below the North China Block. Top-to-the-south shearing is coeval with Late Permian-Early Triassic blueschist facies metamorphism, and possibly with the development of south-verging recumbent folds in the Neoproterozoic-Paleozoic sedimentary cover of the South China foreland. The main ductile deformation (D2) is an extensional one, characterized by top-to-the-north shearing, coeval with the early stage of exhumation of the high-pressure rocks. A top-to-the-NW ductile shearing, and microfolds overturned to the northwest, belong to a second deformational phase of exhumation (D3) which is distinct from the main event (D2). Previous 40 Ar-39 Ar mica dates ranging between 245 and 212 Ma suggest Late Permian-Early Triassic ages for the D1 to D3 events. The D4 event produced NE-SW trending folds in the sedimentary cover interpreted as gravity collapse structures. A Late Cretaceous brittle extensional event (D5) controls the opening and infill of continental half-grabens. In the study area, the Tan-Lu fault is a Cretaceous brittle normal fault. The lack of ductile deformation presented along the Tan-Lu fault suggests that it did not play a significant role in the exhumation of high-pressure metamorphic rocks.

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Section: Evidence For An Earlier Ductile Compressional Deformation Evsupporting

confidence: 75%

“…in upper greenschist to lower amphibolite facies metamorphic conditions) higher than during the D1 event (e.g. Law, 1990). …”

Section: Main Ductile Extensional Deformation Event (D2)mentioning

confidence: 94%

Triassic polyphase deformation in the Feidong-Zhangbaling Massif (eastern China) and its place in the collision between the North China and South China blocks

Lin

Faure

Wang

et al. 2005

Journal of Asian Earth Sciences

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“…In both quartz and norcamphor, the asymmetry of the c-axis pattern with respect to the main foliation (S,) as well as the angular relationship between S, and Sb planes are consistent with the bulk sense of shear in the samples (sinistral in Figs. 2 and 12; criteria of Simpson & Schmid 1983, Law 1990). However, the relative strength and some positions of the c-axis maxima in norcamphor differ from those in quartz: in norcamphor, for example, point maxima develop at the periphery of the pole figures (Fig.…”

Section: Experimental Evolution Of Mylonitic Fabrics 705mentioning

confidence: 99%

“…A basic problem encountered when interpreting mylonitic microfabrics from naturally deformed rock is that both microstructure and texture are sensitive to a host of variables (review in Law 1990): the predeformational characteristics of the rock (i.e. grain size, composition), the strain path and strain configuration (i.e.…”

Section: Introductionmentioning

confidence: 99%

The evolution of high-temperature mylonitic microfabrics: evidence from simple shearing of a quartz analogue (norcamphor)

Herwegh

Handy

1996

Journal of Structural Geology

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Abstract-Plane strain simple shearing of norcamphor (C,HiuO) in a see-through deformation rig to a shear strain of y = 10.5 at a homologous temperature of Ts = 0.81 yields a microfabric similar to that of quartz in amphibolite facies mylonite. Synkinematic analysis of the norcamphor microfabric reveals that the development of a steady-state texture is linked to changes in the relative activities of several grain-scale mechanisms. Three stages of textural and microstructural evolution are distinguished: (1) rotation and shearing of the intracrystalline glide planes are accommodated by localized deformation along three sets of anastomozing microshears. A symmetrical c-axis girdle reflects localized pure shear extension along the main microshear set (S,) oblique to the bulk shear zone boundary (abbreviated as SZB); (2) progressive rotation of the microshears into parallelism with the SZB increases the component of simple shear on the S, microshears. Grain-boundary migration recrystallization favours the survival of grains with slip systems oriented for easy glide. This is associated with a textural transition towards two stable c-axis point maxima whose skeletal outline is oblique with respect to the S, microshears and the SZB; and (3) at high shear strains (y > 8), the microstructure, texture and mechanism assemblage are strain invariant, but strain continues to partition into rotating sets of microshears. Steady state is therefore a dynamic, heterogeneous condition involving the cyclic nucleation, growth and consumption of grains.

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“…For example, in the presence of basal <a> slip as the dominant slip system, quartz c-axes appear in a cleft girdle under axial extension, in a small circle girdle under axial shortening, and in a crossed girdle with symmetrical or asymmetrical legs under plane coaxial or non-coaxial strain (Tullis, 1977;Tullis et al, 1973;Lister and Hobbs, 1980;Dell'Angelo and Tullis, 1989;Gleason et al, 1993). Crossed girdles may form initially and then switch into a single girdle or even a single c-axis maximum, when dynamic recrystallization sets in and gradually increases with increasing strain (Schmid and Casey, 1986;Law, 1990;Schmid, 1994;Stipp et al, 2002;Mancktelow and Pennacchioni, 2004;Heilbronner and Tullis, 2006). Despite these approaches, there remain two unresolved issues regarding the development of quartz c-axis fabric in non-coaxial deformation.…”

Section: Introductionmentioning

confidence: 99%

Development of quartz c-axis crossed/single girdles under simple-pure shear deformation: Results of visco-plastic self-consistent modeling

Nie

Shan

2014

Journal of Structural Geology

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Crystallographic fabrics: a selective review of their applications to research in structural geology

Cited by 184 publications

References 110 publications

Triassic polyphase deformation in the Feidong-Zhangbaling Massif (eastern China) and its place in the collision between the North China and South China blocks

Triassic polyphase deformation in the Feidong-Zhangbaling Massif (eastern China) and its place in the collision between the North China and South China blocks

The evolution of high-temperature mylonitic microfabrics: evidence from simple shearing of a quartz analogue (norcamphor)

Development of quartz c-axis crossed/single girdles under simple-pure shear deformation: Results of visco-plastic self-consistent modeling

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