Mathematics – Logic
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..477l&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 3/4, p. 477-494
Mathematics
Logic
35
Dynamic Models, Mountains, Orography, Structural Properties (Geology), Taiwan, Tectonics, Collisions, Deformation, Geological Faults, Indentation, Kinematics, Rotation
Scientific paper
Experimental modelling allows one to decribe the development and kinematics of structures in mountain belts formed during oblique convergence. In the collision geometry of the Taiwan mountain belt, the Chinese continental margin is oriented about N60 deg E, whereas the N16 deg E Philippine Sea plate backstop is moving toward the Eurasian plate in the N55 deg W direction. Sandbox experiments have been conducted to simulate the Cenozoic arc-continent collision in Taiwan with a foreland-dipping backstop. The kinematics of deformation comprises a combination of compression and rotation which locally result in a partitioning between thrusting and wrenching. The experimental modelling shows that the faults or shear zones are rotated around the indentation point of the backstop by transcurrent and bookshelf faulting. An overall clockwise rotation (or right-lateral movements) occurs to the north of the indentation point and anticlockwise rotation occurs to the south of the indentation point. Oblique indentation and rotation structures can be demonstrated by (1) the crescent shape of the thrust wedge, (2) pull-apart structures induced by strike-slip tectonics, and (3) bookshelf-type strike-slip faulting resulting from the block rotation around the indentation point.
Lu Chia-Yu
Malavieille Jacques
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