40Ar/39Ar ages and residual volatile contents in degassed subaerial and subglacial glassy volcanic rocks from Iceland

Clay, P. L.; Busemann, H.; Sherlock, Sarah C.; Barry, T. L.; Kelley, Simon P.; McGarvie, David W.

doi:10.1016/j.chemgeo.2015.02.041

Cited by 23 publications

(7 citation statements)

References 45 publications

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“…%) and non-glassy groundmass textures. High-precision instrumentation (Coble et al, 2011), improved understanding of the behaviour of argon in volcanic glass (Clay et al, 2015), and development of methods to counter argon recoil processes that affect samples from fine-grained rocks (Fleck et al, 2014) have increased the potential for this technique to be applied to Holocene lavas. Despite these advances, incomplete exposure of volcanic edifices often remains a hindrance to establishing comprehensive and cohesive eruptive chronologies.…”

Section: Introductionmentioning

confidence: 99%

A high-resolution 40Ar/39Ar lava chronology and edifice construction history for Ruapehu volcano, New Zealand

Conway

Leonard

Townsend

et al. 2016

Journal of Volcanology and Geothermal Research

146

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collapse events; and (6) estimating the long-term eruption rates of composite volcanoes. 2. Geologic setting 2.1. Regional geology Volcanism in central North Island, New Zealand, is associated with westward subduction of oceanic crust of the Pacific Plate at ~45 mm yr-1 beneath the Australian Plate along the Hikurangi Trench system (Fig. 1; Cole and Lewis, 1981; Reyners et al., 2006; DeMets et al., 2010). Most arc-related volcanism is manifested in the Taupo Volcanic Zone (TVZ), a rifting arc active since 2 Ma, which comprises northern and southern segments dominated by andesite-dacite composite cones and a rhyolite-dominated central segment (Wilson et al., 1995). The southern TVZ segment comprises the prominent Tongariro and Ruapehu composite volcanoes as well as several smaller inactive volcanic edifices, which collectively form the Tongariro Volcanic Centre (Fig. 1; Cole, 1978). Rifting and extension in the southern TVZ occurs at a direction of ~115° and a rate of 2.3 ± 1.2 mm yr-1 (Villamor and Berryman, 2006a). This motion is manifested by the 40 km-wide Mount Ruapehu graben, which is bounded by the Rangipo and Raurimu faults to the east and west, respectively, and by the NE-striking Karioi and the ENE-striking Ohakune fault sets to the south (Fig. 1; Villamor and Berryman, 2006b). Ruapehu volcano sits on late Tertiary sediments and Mesozoic basement rocks ('greywacke'). The latter are generally inferred to be part of the Kaweka Terrane, a Jurassic greywacke-argillite sequence of felsic composition that outcrops in the ranges east of the Rangipo Fault (Adams et al., 2009; Lee et al., 2011; Price et al., 2015). An index map of Ruapehu with geographical features referred to throughout the text is provided in Fig. 2. 2.2. Volcanological overview Ruapehu is New Zealand's largest active andesite volcano, with a ~150 km 3 edifice surrounded by a volcaniclastic ring plain of similar volume (Hackett and Houghton, 1989; Gamble et al., 2003). The flanks of the edifice are composed of lava flows and autobreccias

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Section: Introductionmentioning

confidence: 99%

A high-resolution 40Ar/39Ar lava chronology and edifice construction history for Ruapehu volcano, New Zealand

Conway

Leonard

Townsend

et al. 2016

Journal of Volcanology and Geothermal Research

146

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“…(2018) presented three K-Ar ages on the glacio-volcanic unit that underlies the Rangá Formation that yielded ages between 155 ka and 129 ka. Two other ages from this unit (using the 39 Ar/ 40 Ar method) also yielded ages in this range (Clay et al, 2015;Flude et al, 2008).…”

Section: Galtalaekur Site Inmentioning

confidence: 79%

Last interglacial (MIS 5e) sea level proxies in the glaciated Northern Hemisphere

Dalton

Gowan

Mangerud

et al. 2021

Preprint

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Abstract. Because global sea level during the last interglacial (LIG; 130–115 ka) was higher than today, the LIG is a useful analogue for improving predictions of future sea level rise. Here, we synthesize sea level proxies for the LIG in the glaciated Northern Hemisphere for inclusion in the World Atlas of Last Interglacial Shorelines (WALIS) database. We describe 82 sites from Russia, northern Europe, Greenland and North America from a variety of settings, including boreholes, riverbank exposures and along coastal cliffs. Marine sediments at these sites were constrained to the LIG using a variety of radiometric methods (radiocarbon, U-Series dating, K-Ar dating), non-radiometric methods (amino acid dating, luminescence methods, and electron spin resonance, tephrochronology) as well as various stratigraphic and palaeoenvironmental approaches. As the areas in this database were covered by ice sheets from the penultimate glaciation and were affected by glacial isostatic adjustment (GIA), most of the proxies show that sea level was much higher than present during the LIG. Many of the sites show evidence of regression due sea level fall due to GIA uplift, and some also show fluctuations that may reflect regrowth of continental ice or increased influence of the global sea level signal. The database is available at https://doi.org/10.5281/zenodo.5602212 (Dalton et al., 2021).

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“…However, supra-and sub-atmospheric ratios have been frequently reported for different subaerial volcanic glass types and have been attributed to a range of processes (e.g. pumice - Krummenacher, 1970;Kaneoka, 1980;Clay et al, 2011;obsidian -Vogel et al, 2006, Morgan et al, 2009, Clay et al, 2015, Flude et al, 2018; pillow lava rindse.g. Kaneoka, 1994).…”

Section: Air Argon Contaminationmentioning

confidence: 99%

“…Magma mixing with a reservoir with an air-like Ar signature (air, meteoric water or host-rocks with a 36 Ar component) at depth and/or at the surface, before or during eruption, and kinetic mass fractionation seems to control the 40 Ar/ 36 Ar ratios and the 36 Ar content of volcanic glasses (Kaneoka, 1980(Kaneoka, , 1994Vogel et al, 2006;Morgan et al, 2009;Brown et al, 2009;Clay et al, 2015;Flude et al, 2018). Ar diffuses from the air-like reservoir into the magma because its concentration in air (and water) is higher than in silicate melts (Ar solubility in air >> Ar solubility in basaltic melt, Carroll and Stolper, 1993), kinetic theory (Young et al, 2002) dictates that 36 Ar will migrate faster than 40 Ar due to a higher diffusion coefficient (Amalberti et al, 2016).…”

Section: Air Argon Contaminationmentioning

confidence: 99%

Tracking the behaviour of persistently degassing volcanoes using noble gas analysis of Pele's hairs and tears: A case study of the Masaya volcano (Nicaragua)

Cogliati

Sherlock

Halton

et al. 2021

Journal of Volcanology and Geothermal Research

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40Ar/39Ar ages and residual volatile contents in degassed subaerial and subglacial glassy volcanic rocks from Iceland

Cited by 23 publications

References 45 publications

A high-resolution 40Ar/39Ar lava chronology and edifice construction history for Ruapehu volcano, New Zealand

A high-resolution 40Ar/39Ar lava chronology and edifice construction history for Ruapehu volcano, New Zealand

Last interglacial (MIS 5e) sea level proxies in the glaciated Northern Hemisphere

Tracking the behaviour of persistently degassing volcanoes using noble gas analysis of Pele's hairs and tears: A case study of the Masaya volcano (Nicaragua)

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