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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Compositional heterogeneity of the 3.4 km~3 Blue Dragon flow, Craters of the Moon Volcanic Field, Idaho
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Compositional heterogeneity of the 3.4 km~3 Blue Dragon flow, Craters of the Moon Volcanic Field, Idaho

机译：3.4 km〜3蓝龙流的组成异质性，爱达荷州月球火山口的火山口

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摘要

The Blue Dragon lava flow in southern Idaho is one of the largest Holocene basaltic flows in the contiguous U.S. Multispectral remote sensing and field mapping of the flow have revealed its 280 km(2) surface is divided into five large sub-areas with different spectral reflectance and morphology that correspond with distinct periods of the eruption. The flow grew outward from its source fissures primarily via a complex system of lava tubes, and stratigraphic relations at the boundaries of the mapped sub-areas provide temporal information about their order of emplacement. This offers a unique opportunity to reconstruct chemical and mineralogical changes in the source magmas as the eruption progressed. In this first comprehensive study of the compositional diversity of the Blue Dragon flow, geochemical data from 28 rock samples show that over the course of the eruption the lavas became progressively more primitive and depleted in incompatible trace elements, and Pb isotopes show subtle increases. These observations are best explained by eruption from a zoned magma source due to variable assimilation-fractional crystallization (AFC), with the initial eruption of more evolved and enriched magmas that may have been residual from the previous eruption, followed by progressively higher proportions of a more primitive and depleted component from deeper in the system. Differences in lava surface color and morphology among the five mapped eruptive phases may indicate changes in eruptive temperature, flow rate, or both as the Blue Dragon eruption progressed. The results support a growing body of evidence that systematic studies of geochemical variations in monogenetic and short-duration lava flows can reveal the relative influence of processes that affect single batches of magma. (C) 2019 Elsevier B.V. All rights reserved.
机译：爱达荷州南部的蓝龙熔岩流是美国毗连的最大的全新世玄武岩流之一。该流的多光谱遥感和现场测绘表明，其280 km（2）的地表分为五个大的子区域，具有不同的光谱反射率和与喷发的不同时期相对应的形态。流动主要通过一个复杂的熔岩管系统从其源裂缝向外扩展，并且在映射子区域边界处的地层关系提供了有关其排列顺序的时间信息。随着喷发的进行，这提供了独特的机会来重建源岩浆中的化学和矿物学变化。在首次对蓝龙流成分多样性进行的全面研究中，来自28个岩石样品的地球化学数据表明，在喷发过程中，熔岩变得越来越原始，并被不相容的痕量元素所耗尽，Pb同位素显示出微不足道的增加。最好的解释是，由于同化分形结晶（AFC）的变化，从区域性岩浆源喷发，最初喷发的更多岩浆和富集岩浆可能是以前喷发的残余，然后是逐渐增大比例的岩浆。系统中更原始，更枯竭的组件。在五个绘制的喷发阶段之间，熔岩表面颜色和形态的差异可能表明随着蓝龙喷发的进行，喷发温度，流量或两者都有变化。这些结果支持了越来越多的证据，即对单基因和短时期熔岩流的地球化学变化进行系统研究可以揭示影响单批岩浆的过程的相对影响。 （C）2019 Elsevier B.V.保留所有权利。

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