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The Law of Basement Pre-Existing Fabric Controlling Fault Formation and Evolution in Rift Basin
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摘要

///In this paper, the authors use the new brittle faulting theory, the “non-coordination criteria”, to expound and analyze the mechanical mechanism of basement pre-existing fabric controlling fault formation and evolution, to determine the law of change in pre-existing basement fabric activity, and to investigate the controlling role of basement pre-existing fabric on fault formation and evolution. Through the study the authors came to the following conclusions: 1) the basement pre-existing fabric (particularly the pre-existing fault) has priority in activity; 2) the controlling power of pre-existing fabric on basin faulting is determined by its activity that is controlled by the attitude and mechanical property of the pre-existing fabric, as well as its stress state; 3) the faults controlled by basement pre-existing fault exhibit remarkable regularity in their locations and trend (strikes); formation orders, inherited features, and the size distributions; 4) the controlling power of basement pre-existing fault is the strongest; 5) the larger the size of the pre-existing fault is, the more intensive the controlling power of the pre-existing fault on fault formation and evolution will be; and 6) when the shear strength becoming smaller, the possibility of the occurrence of the rupture in the pre-existing weak-zone will be increasing, and its controlling power will steadily be enhanced, but its affection is relatively weak comparing to the basement pre-existing fault.

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