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Experiments on the evolution of laccolith morphology in plan-view

机译：平面视图中漆器形态演变的实验

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The ultimate shape of a laccolith is the result of competition between internal magmatic phenomena (e.g. over-pressure and the process of solidification), and the state of the external host rock (e.g. thickness of the overburden, the presence of faults, and regional tectonic stresses). Intrusion morphology can be utilized as an inferential tool to better understand emplacement dynamics and history. One specific shape aspect rarely considered is the intrusion's ellipticity, which is the ratio of its long to short axes in plan view. Here, with a series of simple analog experiments that integrate the effects of flow along pre-existing fractures and solidification during emplacement, an assessment is performed of the existing models for formation of a laccolith's plan morphology; i.e. growth-dependent and feeder-dependent. The results of these experiments suggest that neither model fully captures the behavior of laccolith ellipticity evolution, and an updated model of formation that takes into account the control of the feeder dike, homogenization of overburden bending moments, and the processes involving solidification is presented. Furthermore, experimental results are compared with ellipticity measurements of natural laccoliths. There are proportionately more high ellipticity laccoliths in Nature than in experiments. This is interpreted as an induced morphological effect by magma viscosity, crustal heterogeneities, and/or incremental assembly. (C) 2017 Elsevier B.V. All rights reserved.
机译：漆岩的最终形状是内部岩浆现象（例如超压和凝固过程）与外部岩体状态（例如上覆岩层的厚度，断层的存在以及区域构造）之间竞争的结果。强调）。入侵形态可以用作推论工具，以更好地了解部署动态和历史。入侵者的椭圆率是很少考虑的特定形状方面，椭圆率是平面图中长轴与短轴之比。在这里，通过一系列简单的模拟实验，将沿既有裂缝的流动与在位过程中的凝固作用进行了整合，评估了用于形成漆器平面形态的现有模型。即生长依赖和饲养者依赖。这些实验的结果表明，这两个模型都不能完全捕捉到漆器椭圆度演化的行为，并且没有考虑到给料堤的控制，上覆弯矩的均质化以及涉及凝固的过程，提出了一种更新的地层模型。此外，将实验结果与天然漆石的椭圆率测量结果进行了比较。与实验相比，自然界中比例更高的椭圆形漆岩比例更高。这被解释为由岩浆粘度，地壳异质性和/或增量组装引起的形态学效应。 （C）2017 Elsevier B.V.保留所有权利。

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