Abstract Low-porosity carbonates in San Vito lo Capo underwent two episodes of faulting: extensional faulting in the late Miocene and strike-slip faulting in the Plio-Pleistocene. Limestones and dolostones reacted differently to these faulting events. The first extensional faulting event within the limestone formed localized faults with a single fault core surrounded by a damage zone. The fault rock was either dolomitized as deformation proceeded or resealed by calcite cement after brecciation. The dolomitized fault rocks were reactivated during the following strike-slip faulting, forming polyphase breccias. On the other hand, strain was distributed in dolostones throughout a wider area during the extensional faulting forming a pulverized fault zone. The pulverized rock experienced cataclastic deformation during the following strike-slip faulting forming anastomosing networks of cataclastic shear bands. Fault cores hosted in the limestone appear to have acted as flow conduits until they were cemented or hardened due to evolving cataclasis. The cataclastic shear bands in the dolostone are likely to form baffles to flow, at least on a local scale. The fracture spacing in the damage zone also varies significantly between the lithologies. In particular, damage zones in the limestone have a 5–10 cm fracture spacing whereas fracture spacing is 0.5–3 cm in the dolostone. It is likely that the differing mechanical and chemical properties of the dolostone and limestone were responsible for creating contrasting fault zone architectures.

中文翻译：

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意大利西西里岛圣维托洛卡波致密石灰岩和白云岩断层：内部结构和岩石物理特性

摘要 San Vito lo Capo 低孔隙度碳酸盐岩经历了两次断层作用：晚中新世的伸展断层作用和上新世-更新世的走滑断层作用。石灰岩和白云岩对这些断层事件的反应不同。石灰岩内的第一次伸展断层事件形成了局部断层，其中单个断层核被损坏带包围。断层岩要么随着变形的进行而被白云石化，要么在角砾化后被方解石胶结物重新封闭。白云石化断层岩在随后的走滑断层作用中重新活化，形成多相角砾岩。另一方面，在伸展断层作用形成粉状断层带期间，应变分布在更广泛区域的白云岩中。粉碎的岩石在随后的走滑断层中经历了碎裂变形，形成了碎裂剪切带的吻合网络。位于石灰岩中的断层核似乎充当了流动管道，直到它们由于不断发展的碎裂而被胶结或硬化。白云岩中的碎裂剪切带很可能形成挡板以流动，至少在局部范围内是这样。损伤带中的裂缝间距在岩性之间也存在显着差异。特别是，石灰岩中的损伤带裂缝间距为 5-10 厘米，而白云岩中的裂缝间距为 0.5-3 厘米。白云岩和石灰岩不同的机械和化学性质很可能是造成形成对比鲜明的断层带结构的原因。位于石灰岩中的断层核似乎充当了流动管道，直到它们由于不断发展的碎裂而被胶结或硬化。白云岩中的碎裂剪切带很可能形成挡板以流动，至少在局部范围内是这样。损伤带中的裂缝间距在岩性之间也存在显着差异。特别是，石灰岩中的损伤带裂缝间距为 5-10 厘米，而白云岩中的裂缝间距为 0.5-3 厘米。白云岩和石灰岩不同的机械和化学性质很可能是造成形成对比鲜明的断层带结构的原因。位于石灰岩中的断层核似乎充当了流动管道，直到它们由于不断发展的碎裂而被胶结或硬化。白云岩中的碎裂剪切带很可能形成挡板以流动，至少在局部范围内是这样。损伤带中的裂缝间距在岩性之间也存在显着差异。特别是，石灰岩中的损伤带裂缝间距为 5-10 厘米，而白云岩中的裂缝间距为 0.5-3 厘米。白云岩和石灰岩不同的机械和化学特性很可能是造成形成对比鲜明的断层带结构的原因。至少在局部范围内。损伤带中的裂缝间距在岩性之间也存在显着差异。特别是，石灰岩中的损伤带裂缝间距为 5-10 厘米，而白云岩中的裂缝间距为 0.5-3 厘米。白云岩和石灰岩不同的机械和化学特性很可能是造成形成对比鲜明的断层带结构的原因。至少在局部范围内。损伤带中的裂缝间距在岩性之间也存在显着差异。特别是，石灰岩中的损伤带裂缝间距为 5-10 厘米，而白云岩中的裂缝间距为 0.5-3 厘米。白云岩和石灰岩不同的机械和化学性质很可能是造成形成对比鲜明的断层带结构的原因。