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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Intrusion of basalt into frozen sediments and generation of Coherent-Margined Volcaniclastic Dikes (CMVDs)
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Intrusion of basalt into frozen sediments and generation of Coherent-Margined Volcaniclastic Dikes (CMVDs)

机译：玄武岩侵入冻结的沉积物中并产生相干边缘的火山碎屑堤（CMVDs）

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摘要

Coherent-Margined Volcaniclastic Dikes (CMVDs) are described for the first time from Askja (Dyngjufjoell), Iceland. These dikes display continuous, coherent glassy margins 5 cm thick and have a variety of clastic interiors comprising vitric tephra, pillow and pillow-fragment bearing lapilli tuffs. CMVDs are interpreted to form when basaltic dikes interact with subglacial ice-cemented volcaniclastic sediments. Formation requires chilling of dike margins, drainage of the dike interior and flooding of the cavity by meltwater, followed by non-explosive mingling of magma, clastics and water. Evidence for ice-cementation includes minimal interaction with the host (<3 mm peperite), local pillowed dike margins and the preservation of continuous glassy coherent margins along the edge of a drained dike cavity. CMVDs should be present at other volcanic centers with ice-cemented sediments, including the Martian cryosphere.
机译：冰岛的Askja（Dyngjufjoell）首次描述了相干边缘火山碎屑堤（CMVD）。这些堤防显示出连续，连贯的玻璃状边缘（5厘米厚），并具有各种碎屑内部结构，包括玻璃态的提夫拉，枕头和带有枕头碎片的青金石凝灰岩。玄武岩大堤与冰河下的冰成火山碎屑沉积物相互作用时，会形成CMVD。形成过程需要冷却堤防边缘，排泄堤防内部以及融化水淹没型腔，然后进行岩浆，碎屑和水的非爆炸性混合。结冰的证据包括与主体（小于3毫米的泡石）的相互作用最小，局部枕状堤防边缘和沿排水堤腔边缘的连续玻璃状连贯边缘的保留。包括火星冰冻圈在内的其他带有冰胶沉积物的火山中心也应存在CMVD。

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