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对取自西南非纳米比亚Damara造山带Waterberg断层带中的细粒灰岩的变形结构与亚微结构开展的多方面综合研究 ,揭示出在流体相遍布的上部地壳环境中 ,细粒灰岩的变形属性具有双重性 :脆性与晶质塑性。这种双重性突出表现在破裂与微破裂构造的广泛发育 ,以及细粒动态重结晶颗粒沿着破裂带 (面 )的出现。导致这种双重过程的主要因素在于岩石变形作用过程中流体相的介入。破裂与微破裂的出现 ,为流体相介入岩石变形提供了通道 ,使得流体相能够弥散于高应变带及高应变晶体内。水解弱化是流体相影响岩石变形的重要机理。流体相促进位错滑移与攀移 ,并加速应变颗粒的恢复作用 ,以协调破裂过程。
A comprehensive and comprehensive study of the deformation and sub-microstructure of fine-grained limestone taken from the Waterberg fault zone in the Damara orogenic belt in Namibia, Southwest Africa reveals that in the upper crustal environment where fluid is abundant, the deformation of fine-grained limestone Properties are dual: brittle and crystalline plasticity. This duality is highlighted by the widespread development of fractures and microbursts and the appearance of finely-grained, dynamically recrystallized grains along the rupture zone (surface). The main factor leading to this dual process is the fluid phase intervention during rock deformation. The appearance of rupture and micro-rupture provided a channel for the fluid phase to intervene in the deformation of the rock, enabling the fluid phase to diffuse into the high-strain zone and the high-strain zone. Hydrolytic weakening is an important mechanism of fluid phase affecting rock deformation. The fluid phase promotes dislocation slip and climb, and accelerates the recovery of the strain particles to coordinate the rupture process.