Folding of Single Elasto-viscous Layer Formation Caused by Transpression Mechanism-Numerical Simulation
Date Issued
2004
Date
2004
Author(s)
Hu, Chi-Wen
DOI
zh-TW
Abstract
Neotectonics of Taiwan is mainly controlled by the oblique convergence between the Eurasian plate and the Philippine Sea plate. The convergence velocity has been estimated at 8.2cm/yr in the N54°W direction(Yu et al., 1997). Sandbox and 3-D Finite element model have been used to verify the role of the transpression mechanism in the structures and reconstruct the evolution of the deformation at the southeastern Taiwan and the west of longitudinal valley (Chen, 2001). Lu et al. (2002) observed the increasing proportion of compression of oblique convergence between the Eurasian plate and the Philippine Sea plate from south to north. Chen’s (2001) result was resembled to Lu et al. (2002).
In the past research, the convergence velocity between the Eurasian plate and the Philippine Sea plate has been estimated at 8.2cm/yr in the N54°W direction(Yu et al., 1997), but it’s issue that the influence of fold possession in different strain rate and the proportion of oblique convergence. This research chooses dominant wavelenth ratio method (Schmalholz & Podladchikov, 1999) to distinguish what the strain rate is ‘’fast’’ or ‘’slow’’ in 2D elasto-viscous model. Expect to know the Taiwan Island extruded under ‘’fast’’ or ‘’slow’’ strain rate by 3-D elasto-viscous finite element model.
The comparison of 2-D elasto-viscous finite element model with dominant wavelenth ratio method (Schmalholz & Podladchikov, 1999), the reciprocal value of coefficient of matrix viscosity which equal to the value of strain rate is the threshold to distinguish the fold wavelenth controlled by elastic competence contrast(Re) or viscosity competence contrast (Rv)：(1)When buckling, fold wavelenth is controlled by elastic competence contrast(Re) in so-called ‘’fast’’ strain rate；(2)When buckling, fold wavelenth is controlled by viscosity competence contrast(Re) in so-called ‘’slow’’ strain rate.
In this research, the result of using different strain rate and the proportion of oblique convergence the by 3-D elasto-viscous finite element, the strain rate is so-called ’’slow’’ between the Eurasian plate and the Philippine Sea plate.
Subjects
黏彈性
褶皺
橫移壓縮
應變速率
數值模擬
ABAQUS
transpression
fold
strain rate
elasto-viscous
Type
thesis
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