Abstract We explore the capability of interconnected sills to transport magma in the shallow crust, as well as the effect of simultaneous and temporally separated multiple magma emplacement on deformation pattern. We analyze this process through analogue models run with synchronous or diachronous magma injection from different, aligned inlets. Experimental results show that the position and activation in time of multiple injection points strongly influence model evolution. In case of synchronous injection at different inlets, intrusions and associated surface deformation are elongated. Forced folds and annular bounding reverse faults are quite elliptical, with the main axis trending sub-parallel to the magma input alignment. Diachronous injection from different sources would instead favor the lateral migration of magma rather than the vertical growth of intrusions. This evolution promotes the development of interconnected intrusions, and suggests that the deformation observed at surface does not necessarily reflect the location and activation timing of their feeders. Overall, our observations have significant implications for the kinematic evolution of sill complexes, timing of intrusion and associated deformation, raising the possibility that interconnected sills may act as channels for long-range lateral magma transport through a succession of sill-fed emplacement events. Model results also suggest that caution should be taken when trying to infer the feeding areas on the basis of the deformation features observed at the surface or in seismic profiles.

中文翻译：

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通过相互连接的基石横向岩浆迁移：来自模拟建模的证据

摘要 我们探讨了相互连接的基岩在浅地壳中输送岩浆的能力，以及同时和时间上分离的多个岩浆侵位对变形模式的影响。我们通过模拟模型分析这个过程，这些模型从不同的、对齐的入口以同步或历时的岩浆注入运行。实验结果表明，多个注入点的位置和时间激活强烈影响模型演化。在不同入口处同步注入的情况下，侵入和相关的表面变形被拉长。强制褶皱和环形边界反向断层是非常椭圆的，主轴的趋势与岩浆输入线平行。不同来源的历时注入反而有利于岩浆的横向迁移而不是侵入体的垂直生长。这种演变促进了相互关联的侵入体的发展，并表明在地表观察到的变形不一定反映其馈线的位置和激活时间。总体而言，我们的观察对窗台复合体的运动学演化、侵入时间和相关变形具有重要意义，这提高了互连的窗台可能作为通过一系列窗台进给侵位事件进行远程横向岩浆输送的渠道的可能性。模型结果还表明，在试图根据在地表或地震剖面中观察到的变形特征来推断馈送区时应谨慎。