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首页> 外文期刊>Journal of Volcanology and Geothermal Research >How deep can be a dyke?
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How deep can be a dyke?

机译：堤有多深？

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The study of the three dimensionality of a dyke is fraught with many difficulties, yet it is an important variable that needs to be characterized to fully understand processes of lithospheric magma transport. The difficulties encountered when attempting to answer the question of how deep can be a dyke are not limited to the lack of an adequate exposure of dykes in the field, but also include several aspects of the common simplifications introduced in theoretical models aiming to describe the formation of this type of intrusive, and even extend to include aspects of the conceptual models of magma ascent. All of these problems are examined in the present paper, showing how is it that each of them can influence the answer that a particular person gives to such question. Although a revised model of the conditions leading to dyke formation is advanced here, it is shown that the present uncertainty surrounding the state of stress in the Earth's crust, its distribution in space and evolution in time inevitably lead to a wide range of possible depths for a given dyke. Nevertheless, by removing the sources of ambiguity inserted in current models portraying dykes as fluid-filled cracks, much is gained towards providing a more definitive answer to this question. In any case, based in the analyses made here, it would seem that the existence of dykes deep enough to provide a temporal conduit between the deepest magma sources and the surface seems to be favored in most conditions of geological relevance.
机译：对堤坝三维度的研究充满了许多困难，但它是一个重要的变量，需要充分表征岩石圈岩浆运移过程。试图回答堤坝的深度问题时遇到的困难不仅限于田间堤坝缺乏足够的暴露，而且还包括旨在描述岩层形成的理论模型中常见简化的几个方面。这种侵入性，甚至扩展到岩浆上升概念模型的各个方面。本文对所有这些问题进行了研究，显示了每个问题如何影响特定人员对此问题的回答。尽管这里提出了导致堤坝形成的条件的修正模型，但结果表明，围绕地壳应力状态，其空间分布和时间演变的当前不确定性不可避免地导致了大范围的可能深度。给定的堤坝。尽管如此，通过消除当前模型中插入的含糊不清的根源，这些模型将堤坝描述为充满流体的裂缝，为解决这个问题提供了更为明确的答案。无论如何，根据此处所做的分析，似乎在大多数与地质相关的条件下，堤坝的存在都足够深，可以在最深的岩浆源和地表之间提供时间通道。

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