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首页> 外文期刊>Journal of structural geology >Implications of rapid, dike-fed pluton growth for host-rock strain rates and emplacement mechanisms
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Implications of rapid, dike-fed pluton growth for host-rock strain rates and emplacement mechanisms

机译：堤坝填充的快速子粒生长对基质岩石应变率和位移机制的影响

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摘要

Dikes must maintain a critical width and flow velocity in order to propagate several kilometers from source to sink without freezing; consequently, they must support a high volumetric magma flow rate. This in turn implies that plutons fed by dikes must fill rapidly. In an effort to predict host-rock strain rates required by dike-fed growth, we employ a three-dimensional geometric model consisting of concentric shells to track instantaneous strain rates in a homogeneously deforming aureole around spheroidal plutons with a range of aspect ratios. Using published values for magma and host-rock parameters appropriate for mid-crustal levels, we calculate, for example, a minimum instantaneous strain rate of approximately 10~(-10) s~(-1) in the deformation aureole of a 1 km radius spherical pluton. Aureole strain rates, which range upward to greater than 10~(-4) s~(-1), are primarily a function of position in the aureole, pluton size, and filling rate; pluton shape plays only a secondary role. Although preservation of evidence for high strain rates may be rare, and although multiple mechanisms probably operate simultaneously, we expect that deformation this rapid in the middle crust would be accommodated primarily by brittle mechanisms.
机译：堤防必须保持临界宽度和流速，以便从冰源传播到水槽几公里而不会冻结。因此，它们必须支持高体积的岩浆流速。反过来，这意味着用堤坝喂养的小动物必须迅速填充。为了预测堤坝生长所需的基质岩石应变率，我们采用了一个由同心壳组成的三维几何模型，来跟踪球形深孔周围均匀变形的金刚石中具有宽高比的瞬时应变率。使用适合于中地壳水平的岩浆和母岩参数的已发布值，例如，我们计算出在1 km变形金极中的最小瞬时应变率约为10〜（-10）s〜（-1）。球形球形子体。向上的金刚应变速率范围大于10〜（-4）s〜（-1），主要是其位置，胶体尺寸和填充速率的函数。子体形状仅起次要作用。尽管保存高应变率的证据可能很少，尽管可能同时使用多种机制，但我们预计中地壳这种快速变形将主要由脆性机制来适应。

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