Back-arc extension superimposed on mountain belts leads to distributed normal faults and shear zones interacting with magma emplacement within the crust. The composition of granitic magmas emplaced at this stage often involves a large component of crustal melting. The Miocene Aegean granitoids were emplaced in metamorphic core complexes (MCCs) below crustal-scale low-angle normal faults and ductile shear zones. Intrusion processes interact with extension and shear along detachments, from the hot magmatic flow within the pluton root zone to the colder ductile and brittle deformation below and along the detachment. A comparison of the Aegean plutons with the island of Elba MCC in the back-arc region of the Apennine subduction shows that these processes are characteristic of pluton–detachment interactions in general. We discuss a conceptual emplacement model, tested by numerical models. Mafic injections within the partially molten lower crust above the hot asthenosphere trigger the ascent within the core of the MCC of felsic magmas, controlled by the strain localization on persistent crustal-scale shear zones at the top that guide the ascent until the brittle ductile transition. Once the system definitely enters the brittle regime, the detachment and the upper crust are intruded, while new detachments migrate upward and in the direction of shearing.

中文翻译：

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岩体和拆离的相互作用：爱琴海和第勒尼安花岗岩的比较

叠加在山带上的弧后伸展导致分布的正断层和剪切带与地壳内的岩浆侵位相互作用。这一阶段的花岗质岩浆成分往往涉及地壳熔融的很大一部分。中新世爱琴海花岗岩被安置在地壳尺度低角度正断层和韧性剪切带下方的变质核复合体（MCC）中。侵入过程与沿拆离的伸展和剪切相互作用，从岩体根部区域内的热岩浆流到拆离下方和沿拆离的较冷的韧性和脆性变形。爱琴海岩体与亚平宁俯冲弧后区域的厄尔巴岛 MCC 岛的比较表明，这些过程通常是岩体-脱离相互作用的特征。我们讨论了一个概念性的进驻模型，通过数值模型进行了测试。热软流圈上方部分熔融的下地壳内的镁铁质注入触发了长英质岩浆 MCC 核心内的上升，由顶部持续地壳尺度剪切带上的应变定位控制，引导上升直到脆性韧性转变。一旦系统确实进入脆性状态，拆离和上地壳被侵入，而新的拆离向上并朝剪切方向迁移。由顶部持续地壳尺度剪切带上的应变定位控制，引导上升直到脆性韧性转变。一旦系统确实进入脆性状态，拆离和上地壳被侵入，而新的拆离向上并朝剪切方向迁移。由顶部持续地壳尺度剪切带上的应变定位控制，引导上升直到脆性韧性转变。一旦系统确实进入脆性状态，拆离和上地壳被侵入，而新的拆离向上并朝剪切方向迁移。