1992
DOI: 10.1111/j.1525-1314.1992.tb00106.x
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Microstructural analysis of the classical spiral garnet porphyroblasts of south‐east Vermont: evidence for non‐rotation

Abstract: New data strongly suggest that the classical spiral garnet porphyroblasts of south-east Vermont, USA, generally did not rotate, relative to geographical coordinates, throughout several stages of non-coaxial ductile deformation. The continuity of inclusion trails (S,) in these porphyroblasts is commonly disrupted by planar to weakly arcuate discontinuities, consisting of truncations and differentiation zones where quartz-graphite S, bend sharply into more graphitic S,. Discontinuous, tight microfold hinges with… Show more

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Cited by 89 publications
(56 citation statements)
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“…Complex trails involve more than a single antiform/synform pair or have trails that curve through more than 90" within the porphyroblast. These include the spectacular helical or 'snowball' geometries observed in garnet porphyroblasts (Rosenfeld, 1970;Schoneveld, 1977;Hayward, 1992). Although the data presented in this study may have implications for the generation of complex trails, none has been recognized in the two terranes studied here, and the remaining discussion is entirely restricted to simple 'sigmoidal' trails.…”
Section: Sigmoidal Inclusion Trailsmentioning
confidence: 59%
“…Complex trails involve more than a single antiform/synform pair or have trails that curve through more than 90" within the porphyroblast. These include the spectacular helical or 'snowball' geometries observed in garnet porphyroblasts (Rosenfeld, 1970;Schoneveld, 1977;Hayward, 1992). Although the data presented in this study may have implications for the generation of complex trails, none has been recognized in the two terranes studied here, and the remaining discussion is entirely restricted to simple 'sigmoidal' trails.…”
Section: Sigmoidal Inclusion Trailsmentioning
confidence: 59%
“…Indeed, strain shadows adjacent to porphyroblasts can be totally destroyed during reactivation of matrix foliations (Bell, 1986), foliation overprinting (fig. 14, Johnson, 1990a;Hayward, 1992), or total destruction of earlier foliations (Bell & Forde, 1992a), and the data indicate that the porphyroblasts have not rotated (Figs 6 & 8). Fig.…”
Section: Field Datamentioning
confidence: 82%
“…During gravitational collapse, near-horizontal foliations initially develop against rigid objects, but only in that portion of the orogen that is affected by gravitational collapse (figs 25d & 26b in Bell & Johnson, 1989); the transition from predominantly spiral to staircase-shaped trails appears to occur around 4.5-5 kbar within orogen cores, suggesting that horizontal foliations can develop in these regions to at least twice this depth (Bell & Johnson, 1992). Successive periods of porphyroblast growth preserve these predominantly horizontally and vertically orientated truncational foliations as inclusion trails over extremely wide areas that have been deformed subsequently many times (Hayward, 1992;Fig. 6).…”
Section: P O R P H Y R O B L a S T S W I T H C O M P L E X I N C L U mentioning
confidence: 99%
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