Helium isotopes and mantle volatiles in Loihi Seamount and Hawaiian Island basalts and xenoliths

Rison, W.; Craig, H.

doi:10.1016/0012-821x(83)90155-3

Cited by 215 publications

(80 citation statements)

References 30 publications

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“…He ranging from 20 to 32 Ra, with higher values in the tholeiites than the alkali basalts (Kurz et al, 1983;Kaneoka et al, 1983;Rison and Craig, 1983).…”

Section: Heliummentioning

confidence: 99%

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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“…He ranging from 20 to 32 Ra, with higher values in the tholeiites than the alkali basalts (Kurz et al, 1983;Kaneoka et al, 1983;Rison and Craig, 1983).…”

Section: Heliummentioning

confidence: 99%

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

et al. 2006

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“…Recently Rison and Craig (1983) found that if atmospheric helium is used as a working stan dard without separating the neon, a measured 3He/4He ratio whose He/Ne ratio differs con siderably from that of the air would be significantly erroneous and require major correc tion. Sano and Wakita (1988) reported a positive correlation between the 3He /4 He and 4He / 20Ne ratios of the air using a modified VG5400 mass spectrometer: the higher the 4He/20Ne ratio, the higher the 3He/4He ratio.…”

Section: Chinamentioning

confidence: 99%

Atmospheric helium isotope ratio.

Sano

Wakita

Xu³

1988

Geochem. J.

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“…The 4 He/ 20 Ne ratios were measured by an inline quadrupole mass spectrometer. Helium was then separated from neon by a cryogenic charcoal trap held at 40 K, because varying He/Ne ratio in terrestrial samples can affect the measured 3 He/ 4 He ratios by up to 10% (Rison and Craig, 1983;Sano and Wakita, 1988 5807 199, 496, 744, 991, 1485, 1978, 2469, 2959, 3449, 3939 ST-7 20°00′ N, 128°00′ E 5660 199, 496, 745, 992, 1485, 1976, 2470, 2961, 3451, 3937 ST-8 25°00′ N, 128°00′ E 7020 198, 496, 744, 992, 1486, 1979, 2471, 2961 KH-07-1 ST-9 37°59′ N, 150°00′ E 5921 544, 989, 1483, 1975, 2466, 2954, 3443, 3930, 4417, 4902, 5387 ST-10 38°00′ N, 157°00′ E 5717 542, 990, 1236, 1728, 1975, 2467, 2955, 3444, 3932, 4418, 4904, 5390 ST-11 32°29′ N, 166°01′ E 6224 594, 988, 1484, 1975, 2463, 2959, 3446, 4422, 4908, 5876 ST-12 32°30′ N, 160°01′ E 4631 542, 989, 1479, 1978, 2465 Observed potential temperature and salinity are also listed in Table 2. Potential temperature is defined as the temequivalent to those of the samples.…”

Section: Introductionmentioning

confidence: 99%