Noble gas systematics of deep rift zone glasses from Loihi Seamount, Hawaii

Valbracht, Peter J.; Staudacher, Thomas; Malahoff, A.; Allègre, Claude J.

doi:10.1016/s0012-821x(97)00094-0

Cited by 125 publications

(105 citation statements)

References 39 publications

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“…This led to new noble gas measurements on samples from the deeper flanks of Lō`ihi (Valbracht et al, 1997;Kaneoka et al, 2002). Like the earlier studies, they found Ar and Xe isotopic compositions close to atmosphere ( 40 Ar/ 36 Ar ranging from 296 (air) to 2600), and total gas concentrations similar to the earlier studies (Fig.…”

supporting

confidence: 78%

“…Present-day solar wind neon is indicated by the upper left hand rectangle. No difference was found between the results the samples collected on the shallow (Honda et al, 1993) and deeper part of the volcano (Valbracht et al, 1997;Kaneoka et al, 2002). Number of located earthquakes 1952 1960 1965 1970 1975 1980 1985 1990 1995 2000 Year July 1996943 Events 1953-1959 No data Figure 7.…”

Section: Figmentioning

confidence: 93%

“…21. Neon isotopes from Lō`ihi seamount glasses determined by step heating and crushing in vacuo in three different laboratories (Honda et al, 1993;Valbracht et al, 1997;Kaneoka et al, 2002). For clarity, only the highest values from each reported measurement are plotted.…”

Section: Figmentioning

confidence: 99%

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Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano

et al. 2006

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A half century of investigations are summarized here on the youngest Hawaiian volcano, Lō`ihi Seamount. It was discovered in 1952 following an earthquake swarm. Surveying in 1954 determined it has an elongate shape, which is the meaning of its Hawaiian name. Lō`ihi was mostly forgotten until two earthquake swarms in the 1970's led to a dredging expedition in 1978, which recovered young lavas. This led to numerous expeditions to investigate the geology, geophysics, and geochemistry of this active volcano. Geophysical monitoring, including a realtime submarine observatory that continuously monitored Lō`ihi's seismic activity for three months, captured some of the volcano's earthquake swarms. The 1996 swarm, the largest recorded in Hawai`i, was preceded by at least one eruption and accompanied by the formation of a ~300-m deep pit crater, renewing interest in this submarine volcano. Seismic and petrologic data indicate that magma was stored in a ~8-9 km deep reservoir prior to the 1996 eruption.Studies on Lō`ihi have altered conceptual models for the growth of Hawaiian and other oceanic island volcanoes and led to a refined understanding of mantle plumes. Petrologic and geochemical studies of Lō`ihi lavas showed that the volcano taps a relatively primitive part of the Hawaiian plume, producing a wide range of magma compositions. These compositions have become progressively more silica-saturated with time reflecting higher degrees of partial melting as the volcano drifts towards the center of the hotspot. Seismic and bathymetric data have highlighted the importance of landsliding in the early formation of an ocean island volcano.Lō`ihi's internal structure and eruptive behavior, however, cannot be fully understood without installing monitoring equipment directly on the volcano.

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supporting

confidence: 78%

Section: Figmentioning

confidence: 93%

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Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano

et al. 2006

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“…However, using neon isotopes, it has been demonstrated that these lower 129 Xe/ 130 Xe ratios are indeed mantle sourced. Figure 4.15 shows recent estimates of 129 Xe/ 130 Xe ratios in Iceland, Galapagos, and Loihi samples, three primitive hotspots for helium and neon (Valbracht et al, 1997;Trieloff et al, 2000;Raquin and Moreira, 2009;Mukhopadhyay, 2012). This diagram will be discussed in detail later because it provides important constraints on early mantle dynamics and the degassing history of the mantle.…”

Section: Figure 410mentioning

confidence: 98%

“…Recent studies using step heating or step crushing, and Ne and Ar measurements on single samples have been performed on MORB and OIB and it seems clear that the mantle sources of most hotpots (e.g., Galapagos, Iceland, Hawaii) have 40 Ar/ 36 Ar ratios lower than 10,000, lower than the maximum MORB ratio of ~30,000 (Hiyagon et al, 1992;Honda et al, 1993;Moreira et al, 1995;Valbracht et al, 1997;Sarda et al, 2000;Trieloff et al, 2000;Trieloff et al, 2002;Honda and Woodhead, 2005;Hopp and Trieloff, 2005;Raquin and Moreira, 2009;Mukhopadhyay, 2012), but higher than the atmospheric ratio (299) which is the value that was proposed for the lower mantle by the Paris group in the 1980's. Another interesting approach used to determine the Ar isotopic composition of mantle reservoirs and document the isotopic heterogeneity of vesicles while avoiding atmospheric contamination was developed by Pete Burnard, now in Nancy (France) but who was then in Manchester (UK).…”

Section: Radiogenic Argon In Morb and Oibmentioning

confidence: 99%

Noble gas constraints on the origin and evolution of Earth’s volatiles

Moreira¹

2013

GeochemPersp

115

164

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Geodynamic implications for zonal and meridional isotopic patterns across the northern Lau and North Fiji Basins

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Jackson

Blichert‐Toft

et al. 2017

Geochem Geophys Geosyst

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We present new Sr-Nd-Pb-Hf-He isotopic data for 65 volcanic samples from the northern Lau and North Fiji Basins. This includes 47 lavas obtained from 40 dredge sites spanning an east-west transect across the Lau and North Fiji basins, 10 ocean island basalt (OIB)-type lavas collected from seven Fijian islands, and eight OIB lavas sampled on Rotuma. For the first time, we are able to map clear north-south and east-west geochemical gradients in 87 Sr/ 86 Sr across the northern Lau and North Fiji Basins: lavas with the most geochemically enriched radiogenic isotopic signatures are located in the northeast Lau Basin, while signatures of geochemical enrichment are diminished to the south and west away from the Samoan hot spot. Based on these geochemical patterns and plate reconstructions of the region, these observations are best explained by the addition of Samoa, Rurutu, and Rarotonga hot spot material over the past 4 Ma. We suggest that underplated Samoan material has been advected into the Lau Basin over the past $4 Ma. As the slab migrated west (and toward the Samoan plume) via rollback over time, younger and hotter (and therefore less viscous) underplated Samoan plume material was entrained. Thus, entrainment efficiency of underplated plume material was enhanced, and Samoan plume signatures in the Lau Basin became stronger as the trench approached the Samoan hot spot. The addition of subducted volcanoes from the CookAustral Volcanic Lineament first from the Rarotonga hot spot, then followed by the Rurutu hot spot, contributes to the extreme geochemical signatures observed in the northeast Lau Basin.

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Noble gas systematics of deep rift zone glasses from Loihi Seamount, Hawaii

Cited by 125 publications

References 39 publications

Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano

Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano

Noble gas constraints on the origin and evolution of Earth’s volatiles

Geodynamic implications for zonal and meridional isotopic patterns across the northern Lau and North Fiji Basins

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