Eruption and emplacement processes of the Pleistocene Barriball Road Tuff Ring, South Auckland Volcanic Field, New Zealand

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Volcanology and Geothermal Research Pub Date : 2024-06-20 DOI:10.1016/j.jvolgeores.2024.108130

Tehnuka Ilanko , Adrian Pittari , Roger Briggs , Károly Németh , Michael Rosenberg

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Abstract

Phreatomagmatic eruptions in basaltic monogenetic volcanic fields are strongly influenced by their geological and environmental settings. Barriball Road volcano exemplifies the eruption processes associated with South Auckland Volcanic Field (SAVF), New Zealand. Stratigraphy and petrography reveal the complex eruptive history of this small-volume phreatomagmatic volcano. An initial phreatomagmatic phase formed two overlapping tuff rings from successive vents, and excavated lithics from a shell-rich Pliocene age aquifer (∼170 m depth). The first tuff ring was constructed mainly through pyroclastic fall and the second is dominated by pyroclastic surge (dilute pyroclastic density current) deposits. Transition to a terminal magmatic phase produced a nested scoria cone. Vent migration between the eruption of the tuff rings may have been induced by collapse of the soft substrate, restricting water and magma supply to the first vent. Regional block faulting is inferred to have strongly influenced magma ascent and vent alignment, as seen at many SAVF and other monogenetic field volcanoes.

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新西兰南奥克兰火山岩场更新世巴里鲍尔路凝灰岩环的喷发和形成过程

玄武岩单源火山带的喷发受其地质和环境背景的影响很大。巴里鲍尔路火山是新西兰南奥克兰火山场喷发过程的典型代表。地层学和岩相学揭示了这座小火山喷发的复杂历史。最初的喷火阶段从连续的喷口形成了两个重叠的凝灰岩环，并从富含贝壳的上新世时期含水层（深度 ∼ 170 米）中挖掘出了岩石。第一个凝灰岩环主要由火成岩坠落形成，第二个凝灰岩环主要由火成岩涌流（稀释火成岩密度流）沉积形成。向岩浆末期的过渡产生了一个嵌套的灼烧岩锥。凝灰岩环喷发之间的喷口迁移可能是由于软基质坍塌引起的，从而限制了对第一个喷口的水和岩浆供应。据推断，区域性块状断层对岩浆上升和喷口排列产生了强烈影响，这在许多萨沃夫火山和其他单源野外火山中都可以看到。

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来源期刊

Journal of Volcanology and Geothermal Research 地学-地球科学综合

CiteScore

5.90

自引率

13.80%

发文量

183

审稿时长

19.7 weeks

期刊介绍： An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.