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首页> 外文期刊>Contributions to Mineralogy and Petrology >Microstructural evidence for crystallization regimes in mafic intrusions: a case study from the Little Minch Sill Complex, Scotland
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Microstructural evidence for crystallization regimes in mafic intrusions: a case study from the Little Minch Sill Complex, Scotland

机译:MAFIC Intrings中结晶制度的微观结构证据:苏格兰小米奇·斯内尔综合体的案例研究

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摘要

The magma forming the 20m thick crinanitic/picrodoleritic Dun Raisburgh sill, part of the Little Minch Sill Complex of NW Scotland, comprised a mafic carrier liquid with a crystal cargo of plagioclase and olivine (1 vol%). The olivine component of the cargo settled on the floor of the intrusion while the more buoyant plagioclase component remained suspended during solidification, resulting in a relatively high plagioclase content in the centre of the sill. The settled olivine grains form a lower fining-upwards sequence overlain by a poorly sorted accumulation formed of grains that grew within the convecting magma. The accumulation of olivine on the sill floor occurred over 5-10 weeks, synchronous with the upwards-propagation of a solidification front comprising a porous (70 vol% interstitial liquid) plagioclase-rich crystal mush.
机译:形成20米厚的Crinanitic / Picrodoleratic Dun Raisburgh窗台的岩浆,部分苏格兰的小型米尔·塞尔综合体的一部分,包括乳头载体液体,塑料型蛋白质和橄榄石(1 Vol%)。 货物的橄榄石成分在侵入的地板上沉淀,同时在凝固过程中仍然悬浮的浮动普珠酶组分,导致窗台中心的相对高的普发基酶含量。 沉降的橄榄石颗粒形成较低的翅片向上序列,通过由在对流岩浆内的颗粒形成的颗粒形成的差分积累覆盖。 橄榄石在窗台地板上的积累发生超过5-10周,同步,凝固前的向上繁殖,包括多孔(70体积%间质液体)富氯化酶富含水晶糊状物。

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