The 2014–2015 Holuhraun eruption extruded >1 km³ of lava in a barren region of the Icelandic highlands. Due to its large volume and the abundance of data for this eruption, Holuhraun is an ideal site to investigate fissure-fed eruption products for comparison with other large lava flows-fields on Earth and other planetary bodies. To characterize lava morphologies associated with this event, we used 0.01–0.5 m/pixel image data, acquired by aerial surveys and small Unoccupied Aircraft Systems (sUAS) to create a 1:800-scale facies map that was ground-truthed using field observations during the summers of 2015–2019. Each facies region exhibits similar attributes in the remote sensing data, including albedo, surface texture, and geomorphology. However, at our mapping scale of 1:800, the facies typically include mixtures of lava types. Results show that transitional lava types (e.g., rubbly pāhoehoe, slabby pāhoehoe, and spiny pāhoehoe) dominate the 2014–2015 Holuhraun lava flow-field (83.82 km²), rather than the traditional end-members of ʻaʻā and classical pāhoehoe. At 1:800-scale, we distinguish the following eight facies (with the percentage of total flow-field area shown in parentheses): rubbly (57.35%), spiny (25.96%), undifferentiated rubbly–spiny (9.59%), shelly (5.58%), pāhoehoe (1.24%), flat-lying–knobby (0.58%), vent-proximal edifice (0.19%), and channel interior (0.16%). Field observations show that initial coherent pāhoehoe surfaces were episodically disrupted to produce slabby and rubbly textures that resemble ʻaʻā in remote sensing data. Our observations also show that continued solidification of the lava beneath brecciated surfaces can cause the surfaces of disrupted lobes to stabilize, or restabilize and undergo inflation. These factors complicate the use of surface texture as a direct indicator of emplacement style, which can change over the course of an eruption. This complexity has important implications for reconstructing the emplacement history of flow-fields on Earth and other planetary bodies.

2014-2015年的霍鲁伦火山喷发> 1 km ³冰岛高地贫瘠地区的熔岩流。由于火山爆发的大量数据和大量数据，霍卢赫劳恩是研究裂隙性火山喷发产物以与地球和其他行星体上其他大型熔岩流场进行比较的理想场所。为了表征与该事件相关的熔岩形态，我们使用了0.01–0.5 m /像素的图像数据，这些数据是通过航测和小型无人飞机系统（sUAS）采集的，创建了一个1：800比例的相图，该图使用实地观测进行了实地分析。在2015–2019年夏季。每个相区域在遥感数据中都表现出相似的属性，包括反照率，表面纹理和地貌。但是，在我们的比例尺为1：800的情况下，相通常包括熔岩类型的混合物。结果表明，过渡性熔岩类型（例如，碎石phoehoe，²），而不是传统的“ aʻā”和古典“ phoehoe”的最终成员。在1：800的比例下，我们区分出以下八个相（括号中显示了流场总面积的百分比）：碎石（57.35％），多刺的（25.96％），未分化的碎石-多刺的（9.59％），有壳的（5.58％），phoehoe（1.24％），平躺式旋钮（0.58％），通风孔近侧大厦（0.19％）和通道内部（0.16％）。野外观察表明，最初相干的phoehoe表面被明显地破坏，产生了类似于遥感数据中“ a”的平板状和碎石状纹理。我们的观察结果还表明，在角砾化表面下熔岩的持续凝固会导致破裂裂片的表面稳定或恢复稳定并发生膨胀。这些因素使使用表面纹理作为放置样式的直接指示变得更加复杂，而放置样式可能会在喷发过程中发生变化。这种复杂性对于重建地球和其他行星体上流场的定位历史具有重要意义。