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Insights into the mechanisms and timescales of pluton assembly from deformation patterns of mafic enclaves

机译:从镁铁质飞地的变形模式洞察质子组装的机理和时标

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摘要

We propose a novel method to constrain both timescales and assembly styles of intrusive bodies using the strain recorded by mafic enclaves, a common component of granitic rocks. Petrology, thermal modeling, and magma rheology are combined to investigate the evolution of strain recorded by enclaves during the piecemeal assembly of a pluton growing at various rates of magma input. The different compositions (and hence phase relations) of host magma and enclaves limits homogeneous deformation of these two materials to restricted temperature ranges, which we term "windows of mutual deformability." Outside these windows only the less viscous host granite records any appreciable deformation and enclaves are mainly transported as rigid objects. The temporal and spatial development of the windows of mutual deformability reflects the emplacement rate of magmas into the pluton. Consequently, the radial distribution of strain recorded by enclaves can provide a picture of the thermal and rheological evolution of a magmatic body during its construction. Our approach is applied to deformation patterns of mafic enclaves in the Lago della Vacca Complex (LVC) of the Adamello Massif (Italy), to estimate the timescales of pluton emplacement. Our calculations suggest total emplacement timescales of the order 50 to 150 ky, in excellent agreement with recent high precision radiometric dating of zircons from the LVC.
机译:我们提出了一种新的方法,利用镁铁质飞地(花岗岩岩石的常见组成部分)记录的应变来约束侵入体的时标和装配方式。结合岩石学,热模型学和岩浆流变学,研究了在各种岩浆输入速率下生长的岩体的零碎组装过程中,飞地记录的应变的演变。宿主岩浆和飞地的不同成分(以及因此的相位关系)将这两种材料的均匀变形限制在有限的温度范围内,我们称其为“相互变形能力的窗口”。在这些窗口之外,只有黏度较低的主体花岗岩记录了任何明显的变形,飞地主要作为刚性物体运输。相互可变形窗口的时空分布反映了岩浆进入岩体的速度。因此,飞地记录的应变的径向分布可以提供岩浆体构造过程中的热和流变演化的图像。我们的方法应用于在意大利阿达梅洛地块的Lago della真空复合体(LVC)中的镁铁质飞地的变形模式,以估计岩体位置的时间尺度。我们的计算表明总的安置时间尺度为50至150 ky,与最近来自LVC的锆石的高精度放射定年非常吻合。

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