Interaction between brittle fracture and ductile flow during crustal deformation
Interaction between brittle fracture and ductile flow during crustal deformation
复制标题
地壳变形过程中脆性断裂与延性流动的相互作用
DOI：
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发表时间：
2008
期刊：
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通讯作者：
N. Mancktelow
中科院分区：
文献类型：
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作者：
N. Mancktelow
大多数地壳变形理论模型都假设岩石要么根据某种屈服准则破裂（通常视为对压力的简单线性莫尔-库仑依赖性），要么由于晶体塑性或扩散而以粘性方式流动。然而，直接现场观察显示断裂和流动之间存在更密切的相互作用，前体断裂定位随后的延性剪切区，而这些剪切区又可能被离散断裂所覆盖，这意味着脆性-延性行为的多个周期。裂缝和流动可能在小距离内同时存在，活动裂缝周围的扰动流动产生特征性的侧翼结构。如果流变模型要真实地模拟岩石变形，则必须包括这种相关的脆性-延性行为。
Most theoretical models of crustal deformation assume that rocks either fracture according to some yield criterion (usually taken as a simple linear Mohr-Coulomb dependence on pressure) or flow in a viscous manner due to crystal plasticity or diffusion. However, direct field observation shows a much more intimate interplay between fracture and flow, with precursor fractures localizing subsequent ductile shear zones that may in turn be overprinted by discrete fractures, implying multiple cycles of brittle-ductile behaviour. Fracture and flow may be coeval over small distances, with the perturbation flow surrounding active fractures producing characteristic flanking structures. Rheological models must include this linked brittle-ductile behaviour if they are to realistically model rock deformation.