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首页> 外文期刊>Journal of Volcanology and Geothermal Research >A theoretical model for the formation of Ring Moat Dome Structures: Products of second boiling in lunar basaltic lava flows
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A theoretical model for the formation of Ring Moat Dome Structures: Products of second boiling in lunar basaltic lava flows

机译：环形护城河穹顶结构形成的理论模型：月球玄武岩熔岩流中的第二次沸腾产物

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Newly documented Ring Moat Dome Structures (RMDSs), low mounds typically several hundred meters across with a median height of similar to 3.5 m and surrounded by moats, occur in the lunar maria. They appear to have formed synchronously with the surrounding mare basalt deposits. It has been hypothesized that they formed on the surfaces of lava flows by the extrusion of magmatic foams generated in the flow interiors as the last stage of the eruption and flow emplacement process. We develop a theoretical model for the emplacement and cooling of mare basalts in which the molten cores of cooling flows are inflated during the late stages of eruptions by injection of additional hot lava containing dissolved volatiles. Crystallization of this lava causes second boiling (an increase in vapor pressure to the point of supersaturation due to crystallization of the melt), generating copious quantities of vesicles (magmatic foam layers) at the top and bottom of the central core of the flow. Flow inflation of many meters is predicted to accompany the formation of the foam layers, flexing the cooled upper crustal layer, and forming fractures that permit extrusions of the magmatic foams onto the surface to form domes, with subsidence of the subjacent and surrounding surface forming the moats. By modeling the evolution of the internal flow structure we predict the properties of RMDSs and the conditions in which they are most likely to form. We outline several tests of this hypothesis. (C) 2019 Published by Elsevier B.V.
机译：新记录的环形护城河穹顶结构（RMDSs）通常发生在数百米高的小丘上，中间高度大约为3.5 m，周围环绕着护城河，发生在月球玛丽亚地区。它们似乎与周围的母马玄武岩沉积物同步形成。据推测，它们是在火山喷流表面形成的，这是通过喷发在流动内部产生的岩浆泡沫作为喷发和流动安置过程的最后阶段而形成的。我们为母马玄武岩的沉积和冷却建立了一个理论模型，在该模型中，在喷发后期，注入额外的含有溶解性挥发物的热熔岩，使冷却流的熔融核膨胀。熔岩的结晶引起第二次沸腾（由于熔体的结晶，蒸气压增加到过饱和点），在流动中心核的顶部和底部产生大量的囊泡（岩浆泡沫层）。预计将有数米的水流膨胀伴随着泡沫层的形成，使冷却的上地壳层弯曲，形成裂缝，从而允许岩浆泡沫挤出到地表形成穹顶，而地下和周围表面的沉陷形成了泡沫。护城河。通过对内部流动结构的演变进行建模，我们可以预测RMDS的特性及其最有可能形成的条件。我们概述了该假设的一些检验。 （C）2019由Elsevier B.V.发布

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