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Accretionary Wedge Numerical Simulation of Tectonic Deformation

Author: GuoAiJun
Tutor: WangGenHou；JinWeiJun
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: Accretionary wedge Subduction zone Numerical Simulation Subduction angle Stress and strain
CLC: P553
Type: Master's thesis
Year: 2009
Downloads: 98
Quote: 0
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Abstract


Accretionary wedge, also known as the first arc abatement rocks, accretionary prism sediments and oceanic crust by subduction scraping pieces constructed handling and piled to thrust faults formed in front of the overlying plate boundary wedge geological body. Accretionary wedge developed on the the subducting plate leading edge of the overriding plate side of the formation process is the process of lateral and vertical growth of continental crust. As a product of the process of subduction, the tectonic position of the output of the accretionary wedge represents the the ancient subduction pieced together sutures. The structural features of the accretionary wedge by the angle of the subducting plate change, subduction rate, sediment supply rate and subduction continuity and discontinuity structure factors, its mode of occurrence and the edge of the plate convergence nature and plates The exhumation process and other factors are closely related. In short, the study of the structure of the accretionary wedge output position, developmental characteristics and mode of occurrence of important instructions to investigate the dynamical evolution of the subduction process. Is generally believed that the inclination of the subduction zone (Benioff zone) is about 45o. Recent studies show that, along the island arc inclination toward Benioff zone quite a change, mostly concentrated in the range of 15o - 90o. The study found that the inclination of the Benioff zone depends on the the subduction speed of, the greater the dive speed the Benioff zone inclination of the smaller, on the contrary, the inclination of the Benioff zone is the greater. With the development of the computer and the finite element method, the numerical simulation technology has become one of the geologists quantitative study of geological processes. Hyperplasia wedge as important tectonic subduction zone exists in a trench around the world or the geological history of the orogenic belt. In order to understand the characteristics of the accretionary wedge geometry, internal structure, dynamics conditions, this article uses the finite element numerical simulation techniques to determine the accretionary wedge formed dynamic background to observe the effect of the subduction zone constraints of the inclination of the accretionary wedge judge subduction zone inclination plays a major role in to dynamic to show accretionary wedge formed the whole process from the initial to the Discovery wedge formation of the migration of the substance in the development process, as well as quantitative clarify the accretionary wedge during the formation of the state of stress and strain. In short, these tectonic modeling system reveals a subduction zone accretionary wedge formation mechanism and its evolution.

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CLC: > Astronomy,Earth Sciences > Geology > Geomechanics > Crustal stress and active tectonics
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