Strontium isotopic geochemistry of the volcanic rocks and associated megacrysts and inclusions from Ross Island and vicinity, Antarctica

Stuckless, John S.; Ericksen, Rick L.

doi:10.1007/bf00382180

Cited by 32 publications

(10 citation statements)

References 26 publications

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“…These batches would contribute to the shallow magma budget, with rapid fluxing leading to differentiation to the typical phonolites erupted by Erebus for 17 ka or more. We note also that the presence of large mantle xenoliths in volcanic rocks from Ross Island and neighbouring volcanoes ( [Gamble et al, 1988], [Kyle et al, 1987] and [Stuckless and Ericksen, 1976]), including White Island, a shield volcano belonging to the Erebus Province (Cooper et al, 2007), suggests that basanitic magma formed in the upwelling mantle can rise rapidly to shallow levels, without appreciable residence in crustal magma chambers (Cooper et al, 2007). The variability recorded by Nd, Sr, Hf and particularly Pb isotopes between the (older) Erebus Lineage and DVDP basanites and phonotephrites, and the younger phonolitic lavas and bombs reinforces this possibility, suggesting efficient mixing of the parental basanites in a large magma chamber as a probable explanation for the observed Erebus isotopic compositions (Sims et al, 2008).…”

Section: From Depth To Surface: Magmatic Evolution and Passive/explosmentioning

confidence: 76%

Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica

Oppenheimer

Moretti

Kyle

et al. 2011

Earth and Planetary Science Letters

123

139

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International audienceContinental intraplate volcanoes, such as Erebus volcano, Antarctica, are associated with extensional tectonics, mantle upwelling and high heat flow. Typically, erupted magmas are alkaline and rich in volatiles (especially CO2), inherited from low degrees of partial melting of mantle sources. We examine the degassing of the magmatic system at Erebus volcano using melt inclusion data and high temporal resolution open-path Fourier transform infrared (FTIR) spectroscopic measurements of gas emissions from the active lava lake. Remarkably different gas signatures are associated with passive and explosive gas emissions, representative of volatile contents and redox conditions that reveal contrasting shallow and deep degassing sources. We show that this unexpected degassing signature provides a unique probe for magma differentiation and transfer of CO2-rich oxidised fluids from the mantle to the surface, and evaluate how these processes operate in time and space. Extensive crystallisation driven by CO2 fluxing is responsible for isobaric fractionation of parental basanite magmas close to their source depth. Magma deeper than 4 kbar equilibrates under vapour-buffered conditions. At shallower depths, CO2-rich fluids accumulate and are then released either via convection-driven, open-system gas loss or as closed-system slugs that ascend and result in Strombolian eruptions in the lava lake. The open-system gases have a reduced state (below the QFM buffer) whereas the closed-system gases preserve their deep oxidised signatures (close to the NNO buffer)

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Section: From Depth To Surface: Magmatic Evolution and Passive/explosmentioning

confidence: 76%

Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica

Oppenheimer

Moretti

Kyle

et al. 2011

Earth and Planetary Science Letters

123

139

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“…Seawater interaction before quenching or eruption of all these lavas, as well as adsorption of atmospheric argon during sample processing, would result in ratios that represent lower limits of the •øAr/36Ar ratios of the source regions of these basalts. Experimental results [Green and Ringwood, 1967;Green and Hibberson, 1970], isotopic studies [Stuckless and Ericksen, 1976;Stuckless and Irving, 1976], and thermodynamic calculations [Bacon and Carmichael, 1973;Carmichael et al, 1977] suggest that megacrysts are high-pressure equilibrium precipitates from ascending alkalic lavas. The rare gases within a megacryst will therefore reflect the isotopic composition of an alkalic silicate liquid at substantial depths [e.g., < 30 km, Carmichael et al, 1977].…”

Section: Rare Gas Isotopes In Basic Lavasmentioning

confidence: 99%

Systematics of rare gas isotopes in basic lavas and ultramafic xenoliths

Kyser¹,

Rison²

1982

J. Geophys. Res.

165

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Mid‐ocean ridge (MOR) tholeiites and several ultramafic xenoliths from a variety of localities have identical 3He/4He ratios of 1.3×10−5 which indicate that a large portion of the mantle has a constant helium isotopic composition. In contrast, megacrysts from alkali basalts, phenocrysts from andesites, and some nodules have 3He/4He ratios of 0.3 to 1.3×10−5, and submarine tholeiites from Kilauea have ratios greater than 1.3×10−5. The low ratios of some nodules may be due either to loss of 3He by prior outgassing events that lowered the 3He/(U + Th) ratio or to interactions with metasomatic fluids having low 3He/4He or 3He/(U + Th) ratios. Andesites and nodules associated with subduction zones have 3He/4He ratios indicative of mixing between the helium in MOR tholeiites and subducted helium with a low 3He/4He ratio. High 3He/4He ratios of Hawaiian tholeiites, like the ratios measured in materials from other hot spots, reflect a deeper, less depleted source than do MOR tholeiites. Some xenoliths and lavas have greater 21Ne/22Ne and 20Ne/22Ne ratios than does the atmosphere. Correlation of excess 21Ne with 4He in most samples suggests that the 21Ne is nucleogenic. The excesses of 20Ne are probably the result of mass fractionation processes. Hawaiian submarine lavas, which may sample deeper, less depleted portions of the mantle than do MOR tholeiites, not only have high 3He/4He ratios but also low40Ar/36Ar ratios. Many nodules and megacrysts related to alkali basalts have lower 3He/4He ratios but higher 40Ar/36Ar ratios than do MOR tholeiites because of prior outgassing events that have lowered the 3He/(U + Th) and 36Ar/K ratios. Lavas and nodules associated with subduction zones can have variable 3He/4He and 40Ar/36Ar ratios because of the addition of subducted gases and the disturbance of the relative position of depleted and undepleted portions of the mantle.

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“…and Kuno, (1965); Goldich et al (1975); Kyle (1976Kyle ( , 1990; Stuckless and Ericksen (1976); Kyle et al, (1979); Muncy (1979); Wright-Grassham (1987); Ellerman and Kyle (1990); LeMasurier and Thomson (1990); Sullivan (2006); Timms (2006); Cooper et al, (2007); Kelly et al, (2008); Scanlan (2008); Martin et al, (2010;2013); Iacovino (2014); Aviado et al, (2015); Lee et al (2015); Rasmussen et al, (2017); Phillips et al, (2018). Marie Byrd Land: LeMasurier and Thomson (1990); Hole and LeMasurier (1994); Hart et al, (1997); Panter et al, (1997Panter et al, ( , 2000; LeMasurier et al, (2011LeMasurier et al, ( , 2018.…”

Section: Accepted Articlementioning

confidence: 99%

“…As shown in Figure 5, the available trace elements signature for Chang Peak and Toney Mountain both have a similar composition to that of the U1524 tephra. Figure 8 shows binary diagrams for selected trace elements, (i.e., Th, Y, Nb, and Ce that are available for both Chang Peak and Toney Mountain), plotted against Zr (taken as differentiation index) from a vast array of available literature for the Hallett, Erebus, Melbourne, and Marie Byrd Land Volcanic Provinces (Forbes and Kuno, 1965;Harrington et al, 1967;Hamilton 1972;Goldich et al, 1975;Kyle 1976Kyle , 1982Kyle , 1987Kyle , 1990Kyle et al, 1979;Stuckless and Ericksen, 1976;Muncy 1979;Noll 1985;Wright-Grassham, 1987;Worner et al, 1989;Ellerman and Kyle, 1990;LeMasurier and Thomson 1990;Beccaluva et al, 1991;Hornig and Wörner, 1991;Müller et al, 1991;Hole and LeMasurier 1994;Rocholl et al, 1995;Hart et al, 1997;Panter et al, 1997Panter et al, , 2000Panter et al, , 2018Sullivan 2006;Timms 2006;Cooper et al, 2007;Mortimer et al 2007;Kelly et al, 2008;Scanlan 2008;Nardini et al, 2009;Martin et al, 2010;2013;LeMasurier et al, 2011;…”

Section: Figure 7 Bathymetric Map Of the Ross Sea Area With Included Sites Drilled During The International Ocean Discovery Program (Iodpmentioning

confidence: 99%

Tephrochronology and Provenance of an Early Pleistocene (Calabrian) Tephra From IODP Expedition 374 Site U1524, Ross Sea (Antarctica)

Roberto

Scateni

Vincenzo

et al. 2021

Geochem Geophys Geosyst

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We present a full characterization of a 20 cm-thick tephra layer found intercalated in the marine sediments recovered at Site U1524 during International Ocean Discovery Program (IODP) Expedition 374, in the Ross Sea, Antarctica. Tephra bedforms, mineral paragenesis, and major-and trace-element composition on individual glass shards were investigated and the tephra age was constrained by 40 Ar- 39 Ar on sanidine crystals. The 40 Ar- 39 Ar data indicate that sanidine grains are variably contaminated by excess Ar, with the best age estimate of 1.282±0.012 Ma, based on both single-grain total fusion analyses and step-heating experiments on multi-grain aliquots. The tephra is characterized by a very homogeneous rhyolitic composition and a peculiar mineral assemblage, dominated by sanidine, quartz, and minor aenigmatite and arfvedsonite-riebeckite amphiboles. The tephra from Site U1524 compositionally matches with a ca. 1.3 Ma, rhyolitic pumice fall deposit on the rim of the Chang Peak volcano summit caldera, in the Marie Byrd Land, located ca. 1300 km from Site U1524. This contribution offers important volcanological data on the eruptive history of Chang Peak volcano and adds a new tephrochronologic marker for the dating, correlation, and synchronization of marine and continental early Pleistocene records of West Antarctica.

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Strontium isotopic geochemistry of the volcanic rocks and associated megacrysts and inclusions from Ross Island and vicinity, Antarctica

Cited by 32 publications

References 26 publications

Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica

Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica

Systematics of rare gas isotopes in basic lavas and ultramafic xenoliths

Tephrochronology and Provenance of an Early Pleistocene (Calabrian) Tephra From IODP Expedition 374 Site U1524, Ross Sea (Antarctica)

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