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Back-scattered electron imagery of the tectonic fabrics of some fine-grained sediments : implications for fabric nomenclature and deformation processes (1989)

Agar, Susan M. ; Prior, David J. ; Behrmann, Jan H.

GSA, Geological Society of America

In: Geology, 17 . pp. 901-904.

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Publikationsdatum: 2018-01-17

Beschreibung: Back-scattered electron investigations of Argille Scagliose, mudstones from the Barbados forearc sampled during Ocean Drilling Program Leg 110, and the matrix of the Okitsu melange, southwest Japan, indicate a variety of microfabric geometries and deformation mechanisms despite the similarity of their mesoscopic scaly fabrics. In the Okitsu melange, the scaly fabric is the mesoscopic expression of an anastomosing microfabric, whereas the detailed geometry of scaly fabrics is unrelated to the microfabric in the Argille Scagliose and Leg 110 mudstones. Care must be taken in the classification and interpretation of scaly fabrics in light of these data, and future studies should focus on microstructural investigations.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1130/0091-7613(1989)017〈0901:BSEIOT〉2.3.CO;2

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Electron backscatter diffraction analysis to determine the mechanisms that operated during dynamic recrystallisation of quartz-rich rocks (2012)

Halfpenny, Angela ; Prior, David J. ; Wheeler, John

Pergamon Press

In: Journal of Structural Geology, 36 . pp. 2-15.

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Publikationsdatum: 2016-03-01

Beschreibung: Determination of the controlling nucleation and recrystallisation mechanisms from a samples microstructure are essential for understanding how the microstructure formed and evolved through time. The aim of our research was to apply a quantified analytical approach to the identification of the controlling nucleation, recrystallisation and microstructural modification mechanisms. We used electron backscatter diffraction to quantify the microstructures of naturally deformed quartz-rich rocks which were deformed at various temperature and pressure conditions. Our results show that ratios of the recrystallised grain size to the subgrain size with values less than 1 (0.5–0.7 in the data presented here) suggest bulge nucleation, whereas ratios of ∼1 suggest subgrain rotation nucleation. Other supporting evidence for subgrain rotation nucleation is an increase in misorientation from the centre of an original protolith ‘parent’ grain to the edge. All samples show evidence for modification of the microstructure due to grain boundary sliding including increased misorientation angles between grains and movement of recrystallised grains between parent grains. By systematically analysing sample microstructures it is possible to separate out evidence to determine the controlling nucleation and recrystallisation mechanisms, as well as being able to identify microstructure modification mechanisms. Using microstructural quantification via EBSD allows a systematic methodology to analyse samples from any location from an objective viewpoint.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1016/j.jsg.2012.01.001

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