A combined structural and petrological study focuses on the Sila Piccola Massif to obtain new constraints on the exhumation history of a relic fragment of the intermediate to deep portion of the Variscan basement, which now belongs to the northern Calabria Peloritani Orogen. The timescale of the early (i.e. late-Variscan) shear-assisted exhumation stage is determined by diffusion-modelling and the strain rate of the latest (i.e. Alpine) shear event is determined by microstructurally derived paleopiezometry. The intermediate to deep portion of the Sila basement is characterised by a pervasive mylonitic horizon involving orthogneiss and, to a lesser extent, garnet paragneiss. Such a pervasive mylonitic foliation widely obliterated an older metamorphic fabric, which is preserved as relics in low-strain domains. The pre-mylonitic relics consist of plagioclase, biotite, white mica, sillimanite, quartz and the first generation of chemically homogeneous garnet. Our results show that the later mylonitization can be ascribed to two metamorphic stages. The first stage is associated with a late-Variscan extensional shearing, which shows a syn-kinematic growth of a second-generation garnet with plagioclase, biotite and quartz developed in the pressure shadows of garnet porphyroclasts likely during an early retrograde metamorphic stage. The second stage, characterised by a syn-shearing growth of chlorite, white mica, plagioclase and quartz, observed along the C-planes, is interpreted as a late Alpine mylonitic overprint in compressional regime.

结构和岩石学的结合研究集中在Sila Piccola Massif上，以获取对瓦里斯卡纳地下室中部至深部的遗物碎片发掘史的新限制，该遗物现在属于北部卡拉布里亚Peloritani造山带。早期（即晚期Variscan）剪切辅助发掘阶段的时间尺度通过扩散模型确定，而最新（即Alpine）剪切事件的应变率则通过微观结构派生的古测压法确定。锡拉地下室的中部至深部的特征是普遍的直系层层性马来酸，包括少量的石榴石。这种无处不在的杏仁状叶片广泛抹去了较旧的变质织物，该织物保留为低应变域中的遗物。早辉石时代的遗迹包括斜长石，黑云母，白云母，硅线石，石英和第一代化学均一的石榴石。我们的结果表明，后期的髓鞘化可归因于两个变质阶段。第一阶段与后期的Variscan伸展剪切有关，这表明第二代石榴石与斜长石，黑云母和石英的同运动生长可能是在早期逆行变质阶段的石榴石卟啉石的压力阴影下形成的。沿C平面观察到的第二阶段的特征是亚氯酸盐，白云母，斜长石和石英的同向剪切生长，被解释为在压缩条件下晚期的高山条理性叠印。我们的结果表明，后期的髓鞘化可归因于两个变质阶段。第一阶段与后期的Variscan伸展剪切有关，这表明第二代石榴石与斜长石，黑云母和石英的同运动生长可能是在早期逆行变质阶段的石榴石卟啉石的压力阴影下形成的。沿C平面观察到的第二阶段的特征是亚氯酸盐，白云母，斜长石和石英的同向剪切生长，被解释为在压缩条件下晚期的高山条理性叠印。我们的结果表明，后期的髓鞘化可归因于两个变质阶段。第一阶段与后期的Variscan伸展剪切有关，这表明第二代石榴石与斜长石，黑云母和石英的同运动生长可能是在早期逆行变质阶段的石榴石卟啉石的压力阴影下形成的。沿C平面观察到的第二阶段的特征是亚氯酸盐，白云母，斜长石和石英的同向剪切生长，被解释为在压缩条件下晚期的高山条理性叠印。黑石和石英可能在逆行变质的早期阶段形成于石榴石卟啉岩的压力阴影中。沿C平面观察到的第二阶段的特征是亚氯酸盐，白云母，斜长石和石英的同向剪切生长，被解释为在压缩条件下晚期的高山条理性叠印。黑石和石英可能在逆行变质的早期阶段形成于石榴石卟啉岩的压力阴影中。沿C平面观察到的第二阶段的特征是亚氯酸盐，白云母，斜长石和石英的同向剪切生长，被解释为在压缩条件下晚期的高山条理性叠印。