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《地壳深部压力状态与地质作用学术研讨会论文集》 2003年
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EFFECTS OFF TECTONIC FORCE ON HYDROSTATIC PRESSURE DURING PETROGENESIS AND METALLOGENESIS

【摘要】:正Research on hydrostatic pressure in the crust has been previously conducted from the viewpoint that the hydrostatic pressure is equal to gravity, considering the hydrostatic preessure in the geochemical process of petrogenesis and metallogenesis is mainly derived from tile gravity of overlying rocks.This paper suggests that the stress state of any point in the crust is caused by both gravity, and tectonic force. The authors put forward a viewpoint that the hydrostatic pressure is a com- bination or superposition of two isotropic stresses, i. e. tectonic force and gravity, in the stress field. The results obtained by a finite-element simulation indicate that the additional hydrostatic pressure home by rocks decreases gradually from tile compression zone (Pcs), the shear zone (Psh s) to the tensile zone (Pts) and the difference of the tectonic additional hydrostatic pressure between these deformed zones tends to increase, following the increase in absolute value and/or difference of external forces in different directions.This study tries to explain the effects of tectonic force on hydrostatic pressure during petrogenesis and metallogenesis, which will lay the foundation for research on tectonic physico-chemistry.

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