Optical orientation in elongate plastic quartz

Wayland, Russell Gibson

doi:10.2475/ajs.237.2.99

Cited by 16 publications

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“…Text- fig. 1 shows the weakly preferred distribution of [0001]-axes parallel to the bedding within a fabric similar to that described by Wayland (1939). Measurements from three mutually perpendicular sections show that the grains tend also to be flattened parallel to this plane.…”

Section: Fabric Of Cambrian Quartzitesmentioning

confidence: 79%

Quartz Fabric Reorientation in the Region of Benmore Assynt, North-West Highlands of Scotland

Crampton¹

1963

Geol. Mag.

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In the Assynt area of the North-West Highlands of Scotland a regional preferred orientation of quartz [0001 ]-axes of sedimentary origin in Cambrian quartzites has withstood considerable deformation and destroyed only with the onset of granulation in the immediate vicinity of thrust planes. After partial granulation the remaining scattered quartz grains develop a preferred orientation of [0001]-axes quite distinct from the sedimentary fabric. Recrystallization is apparent well away from the thrust planes, but only supersedes granulation along certain sections of the major Moine Thrust plane. The preferred orientation of quartz [0001 ]-axes in these recrystallized fabrics is somewhat variable. The regional quartz fabric of metamorphic origin in Moine rocks immediately above the thrust planes can experience a similar deformation, recrystallization following granulation with the development of quartz fabrics similar to those in recrystallized quartzites below the Moine Thrust plane.

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Section: Fabric Of Cambrian Quartzitesmentioning

confidence: 79%

Quartz Fabric Reorientation in the Region of Benmore Assynt, North-West Highlands of Scotland

Crampton¹

1963

Geol. Mag.

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“…The type of thing that can be done is illustrated by work on shapes of quartzsand grains. WAYLAND [11] showed that even in well-rounded quartz sand the grains are prolate spheroids, and that there is a distinct tendency for the long axes of the spheroids to be parallel to the c-axes of the quartz grains. He also showed that the c-axes of the grains lie in, or at a small angle to, the bedding plane, and also show a pronounced preferred orientation in the plane.…”

Section: Use Of Petrofabric Diagrams In Geologic Problemsmentioning

confidence: 99%

Why petrofabrics?

Ingerson

1944

Eos Trans. AGU

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The question “Why petrofabrics?” has been asked innumerable times in one form or another in recent years by professional geologists a s well a s by students. The following has been prepared in an attempt to answer this question by outlining: (1) What petrofabrics includes; how it is like structural geology and how different from it; (2) Typical problems in various fields of geology to which petrofabric methods have been applied successfully; (3) Other problems in which petrofabrics should prove helpful; and (4) Some of the things needed to place petrofabric interpretations on a more secure basis.

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Trümmersedimente, klastische Gesteine

Niggli¹,

Niggli

1952

Gesteine Und Minerallagerstätten

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Optical orientation in elongate plastic quartz

Cited by 16 publications

References 0 publications

Quartz Fabric Reorientation in the Region of Benmore Assynt, North-West Highlands of Scotland

Quartz Fabric Reorientation in the Region of Benmore Assynt, North-West Highlands of Scotland

Why petrofabrics?

Trümmersedimente, klastische Gesteine

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