帕沃尼斯蒙斯以南火星喷溅锥的证据

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Ian T.W. Flynn , Erika Rader
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引用次数: 0

摘要

喷溅锥是在地球上观测到的一种常见的岩浆爆炸性火山特征,与夏威夷式和斯特劳博利式熔岩喷泉有关。在整个火星上,有许多爆炸性火山地貌被评估为冷火成岩的堆积物(如灼烧岩锥、凝灰岩环),但对焊接和熔融爆炸沉积物(即喷溅物)的识别仅在最近才进行了研究。我们提出的证据表明在帕沃尼斯蒙斯以南存在火星喷溅锥,并与冰岛 2021 年 Fagradalsfjall 火山喷发期间形成的喷溅锥进行了比较。可能的火星喷溅锥的形态和形态计量学特征与 Fagradalsfjall 火山喷发时形成的喷溅锥的凝集岩更为吻合,而不是焦岩锥所特有的固结不牢的凝灰岩。此外,根据简单的弹道模型,两个喷溅锥的大小符合预期尺寸。溅落物的证据包括高角度斜坡、多节但分层的表面纹理、圆形巨石距骨,以及与岩石而非焦岩材料相一致的热物理性质。这些证据表明,帕沃尼斯蒙斯以南的火山地貌应归类为喷溅锥。火星喷溅锥的确定对喷发动力学、岩浆挥发物含量和环境条件都有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evidence of a Martian spatter cone south of Pavonis Mons

Spatter cones are a common mafic explosive volcanic feature observed on Earth associated with Hawaiian and Strombolian-style lava fountaining. Across Mars there are numerous explosive volcanic features assessed to be accumulations of cold pyroclasts (e.g., scoria cones, tuff rings) but identification of welded and fused explosive deposits (i.e., spatter) has only recently been investigated. We present evidence indicating the presence of a Martian spatter cone south of Pavonis Mons and a comparison to a spatter cone formed during the 2021 Fagradalsfjall eruption, Iceland. The morphology and morphometry of the possible Martian spatter cone are more consistent with agglutinated rock like the spatter cone formed during the Fagradalsfjall eruption than poorly consolidated tephra, characteristic of scoria cones. In addition, the size of the two spatter cones falls within anticipated dimensions based on a simple ballistic trajectory model. Evidence for spatter included high angled slopes, knobby yet layered surface textures, rounded boulder talus, and thermophysical properties consistent with material that is more indicative of rock than scoria. The evidence indicates that the volcanic feature South of Pavonis Mons should be classified as a spatter cone. Identification of a Martian spatter cone has implications for eruption dynamics, magmatic volatile content, and environmental conditions.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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