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Three-dimensional finite strain analysis in the high-grade part of the Sanbagawa Belt using deformed meta-conglomerate.
- Source :
-
Island Arc . Jun2002, Vol. 11 Issue 2, p111-121. 0p. - Publication Year :
- 2002
-
Abstract
- Abstract Regional ductile deformation of the Sanbagawa belt is generally thought to be characterized by constrictional strain, based on strain analysis using deformed radiolarians in the low-grade regions. Similar strain analysis could not be carried out in the medium- to high-grade zones, because it is very difficult to identify individual radiolarians after strong recrystallization. However, discovery of the first known meta-conglomerate in the high-grade region of the Sanbagawa Belt allows quantitative 3-D strain to be estimated in this region. Using a development of the Rf-φ method, an evaluation of appropriate errors for this estimate can be determined. The principal strain ratios and estimated errors are X/Y = 5.4–6.6 and Y/Z = 3.8–3.9 implying deformation in the flattening field and refuting the idea of uniform constrictional strain. Semi-quantitative markers of the shape of the strain ellipse throughout the high-grade regions suggest that the deformation of the Sanbagawa Belt is dominantly in the flattening field. The difference with the earlier results may be due to late-stage overprinting by upright folding of the main ductile fabric in the low-grade region of western Shikoku. [ABSTRACT FROM AUTHOR]
- Subjects :
- *METAMORPHIC rocks
*ROCK deformation
*STRAINS & stresses (Mechanics)
Subjects
Details
- Language :
- English
- ISSN :
- 10384871
- Volume :
- 11
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Island Arc
- Publication Type :
- Academic Journal
- Accession number :
- 6803987
- Full Text :
- https://doi.org/10.1046/j.1440-1738.2002.00360.x