Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough

CHEN Xue; LIN Jin-feng; XU Shi-geng

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CHEN Xue, LIN Jin-feng, XU Shi-geng. Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough[J]. Haiyang Xuebao, 2002, 24(1): 73-85.

Citation:

CHEN Xue, LIN Jin-feng, XU Shi-geng. Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough[J]. Haiyang Xuebao, 2002, 24(1): 73-85.

CHEN Xue, LIN Jin-feng, XU Shi-geng. Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough[J]. Haiyang Xuebao, 2002, 24(1): 73-85.

Citation:

CHEN Xue, LIN Jin-feng, XU Shi-geng. Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough[J]. Haiyang Xuebao, 2002, 24(1): 73-85.

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Dynamic analysis of nappe structure region in the southern margin of the Nansha Trough

1.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
South China Sea Branch, State Oceanic Administration, Guangzhou 510300, China

Received Date: 1999-10-12
Rev Recd Date: 2001-06-20

Abstract

Abstract

The movement and deformation of nappe structure in the southern marg in of the Nansha Trough are proposed,which have elasto-plastic periodicity,and the periodicity is about 1.4 Ma.Based on the dynamic model and two restricting conditions established for accretionary wedge of the nappe,the analytic solutions of principal stress in thrust direction at the midpoint of the nappe base and dynamic friction coefficient of thrust-fault planes are presented.By establishing mechanical model of shear-fault for mation,density model and model of angle of internal friction which are in the front strata of the accretionary wedge of the nappe,effective-yielding principal stress,lithostatic pressure,pr incipal stress in the thrust direction and their resultant force,structure stress are solved for for ming shear-fault during over thrust.By establishing effective plasticyielding model in the nappe base,principal stresses of being effectively yielded and the thrust direction at the midpoint of the nappe base are solved.Two sections are selected to make dynamic calculation,and two stress figures,the dynamic friction coefficients of thrus-tfault planes and the resultant force of the principal stress in the thrust direction are obtained.
- Nansha Trough,
- nappe structure,
- elasto-plastic deformation,
- plastic yielding,
- dynamic model

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References(16)

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