Phreatomagmatic vs magmatic eruptive styles in maar-diatremes: a case study at Twin Peaks, Hopi Buttes volcanic field, Navajo Nation, Arizona
Phreatomagmatic vs magmatic eruptive styles in maar-diatremes: a case study at Twin Peaks, Hopi Buttes volcanic field, Navajo Nation, Arizona
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maar-diatremes 中的岩浆喷发方式与岩浆喷发方式：亚利桑那州纳瓦霍族霍皮山火山场双峰的案例研究
DOI：
10.1007/s00445-020-1365-y
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发表时间：
2020
影响因子：
3.5
通讯作者：
P. Ross
中科院分区：
文献类型：
--
作者：
B. Latutrie;P. Ross
霍皮巴特斯火山区（HBVF）位于北方亚利桑那州的科罗拉多高原。在这个中新世火山区，侵蚀水平向南增加，允许从顶部（后火山口填充物和喷出物环）到底部（较低的直径）研究maar diatreme火山。双峰火山群主要由两座小山（北峰和南峰）组成，山顶有厚厚的熔岩，下面是火山碎屑岩。在HBVF，尽管火山遗迹相对丰富，但迄今为止很少受到科学关注。我们的实地观察使我们能够解释的两个maar diatreme火山演变成熔岩湖填补陨石坑的残余的南北峰。在复杂的，我们区分四个火山单元（从单元1在底部到单元4在顶部）。根据矿床的野外描述和组分测量结果，我们认为单元1为潜水岩浆岩型，单元2为潜水-斯特隆波型（混合潜水岩浆岩和斯特隆波型特征），单元3a为潜水-夏威夷型（混合潜水岩浆岩和夏威夷型特征），单元3b为夏威夷型（由熔岩喷泉形成），单元4由填充玛珥火山口的熔岩湖组成。因此，有一个渐进的演变，从一个纯粹的蒸汽岩浆喷发风格，挖掘火山口和diatremes和部分填充它们，岩浆爆炸到非爆炸喷发风格，填补了玛珥火山口的喷发前的表面。我们讨论了传统的标准，用于区分从岩浆喷发风格的超镁铁质镁铁质岩浆diatreme火山。
The Hopi Buttes volcanic field (HBVF) is located on the Colorado Plateau, Northern Arizona. In this Miocene volcanic field, the erosion level increases southward, allowing the study of maar-diatreme volcanoes from top (posteruptive crater infill and ejecta ring) to bottom (lower diatreme). The Twin Peaks volcanic complex consists mostly of two hills (North Peak and South Peak) with thick lavas at their summits and pyroclastic rocks underneath. In the HBVF, such volcanic remnants have received little scientific attention so far, despite their relative abundance. Our field observations allow us to interpret the North and South Peaks as remnants of two maar-diatreme volcanoes which evolved into lava lakes filling the craters. Within the complex, we distinguish four volcanic units (from unit 1 at the bottom to unit 4 at the top). On the basis of the field description of the deposits and the componentry measurements, we suggest that unit 1 is phreatomagmatic, unit 2 is phreato-strombolian (with mixed phreatomagmatic and strombolian characteristics), unit 3a is phreato-hawaiian (with mixed phreatomagmatic and hawaiian characteristics), unit 3b is hawaiian (formed by lava fountains) and unit 4 consists of lava lakes filling the maar craters. There is therefore a progressive evolution from a purely phreatomagmatic eruptive style, which excavated the craters and diatremes and partly filled them, to magmatic explosive to nonexplosive eruptive styles, which filled the maar craters up to the pre-eruptive surface. We discuss traditional criteria used to distinguish phreatomagmatic from magmatic eruptive styles in ultramafic to mafic maar-diatreme volcanoes.
影响因子：
16.6
作者：
Le Corvec N;Muirhead JD;White JDL
通讯作者：
White JDL