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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 65 - 77 (13page)
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초록· 키워드
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Multiple generations of sub-vertical and sub-horizontal foliations preserved as inclusion trails in garnet in mylonitic rocks from the hanging wall of the Main Central Thrust in the Himalayas indicate that these porphyroblasts did not rotate during thrusting. This result is predicated by (i) a consistent succession of 5 changes in FIA trend (foliation inflection/intersection axes in porphyroblasts) for samples where the orientation changes from porphyroblast cores to rims; (ii) sub-vertical and sub-horizontal foliations occur as inclusion trails around each of the 5 FIAs in the succession, which would not be the case if the garnet porphyroblasts rotated during subsequent phases of deformation as tectonism continued; (iii) a change in inclusion trail asymmetry immediately prior to the commencement of mylonitzation indicates top to the south thrusting only if the porphyroblasts had not rotated as they grew; (iv) the latter asymmetry matches truncated crenulation relics preserved within the mylonitic matrix foliation that indicate top to the south thrusting as the latter foliation formed. Partitioning of deformation into shortening and shearing components stops rotation of porphyroblasts during their growth and during following periods of ductile tectonism. This can be replicated via computer modelling by duplicating the crenulation-hinge-like coaxial environment in which porphyroblasts nucleate and grow before the strain intensifies. This was done using Drucker-Prager constitutive models with temperature-dependent strain softening behaviour and resulted in no porphyroblast rotation when followed by non-coaxial deformation no matter how intense. Furthermore, strain localization in the model containing competent objects of variable size, shape and orientation, produced no rotation during deformation involving components of shortening and shearing. These approaches to modelling mechanically resolve the sub-vertical/sub-horizontal foliations defined by inclusion trails and consistent FIA trend successions obtained from the Main Central Thrust rocks as well as in orogens elsewhere.
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참고문헌 (64)
참고문헌 신청
Abu Sharib, A.S.A.A. / 2012 / Foliation intersection axes (FIAs) preserved within porphyroblasts: resolving plan view orthogonal refolding, Eastern Fold Belt, Mt Isa Inlier / Australian Journal of Earth Science 59:571~598
Abu Sharib, A.S.A.A. / 2011 / Radical changes in bulk shortening directions during orogenesis: significance for progressive development of regional folds and thrusts / Precambrian Research 188:1~20
Aerden, D.G.A.M / 2004 / Correlating deformation in Variscan NW Iberia using porphyroblasts; implications for the Ibero-Armorican Arc / Journal of Structural Geology 26:177~196
Aerden, D.G.A.M. / 2013 / Multi-stage mountain building vs. relative plate motions in the Betic Cordillera deduced from integrated microstructural and petrological analysis of porphyroblast inclusion trails / Tectonophysics 587:188~206
Ali, A. / 2010 / The tectono-metamorphic evolution of the Balcooma Metamorphic Group, northeastern Australia: a multidisciplinary approach / Journal of Metamorphic Geology 28:397~422
Abu Sharib, A.S.A.A. / 2011 / Radical changes in bulk shortening directions during orogenesis: significance for progressive development of regional folds and thrusts / Precambrian Research 188:1~20
Aerden, D.G.A.M / 2004 / Correlating deformation in Variscan NW Iberia using porphyroblasts; implications for the Ibero-Armorican Arc / Journal of Structural Geology 26:177~196
Aerden, D.G.A.M. / 2013 / Multi-stage mountain building vs. relative plate motions in the Betic Cordillera deduced from integrated microstructural and petrological analysis of porphyroblast inclusion trails / Tectonophysics 587:188~206
Ali, A. / 2010 / The tectono-metamorphic evolution of the Balcooma Metamorphic Group, northeastern Australia: a multidisciplinary approach / Journal of Metamorphic Geology 28:397~422
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