Noble gases in submarine pillow volcanic glasses

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doi: 10.1016/0012-821X(83)90068-7
Author(s): Ozima, M.; Zashu, S.
Author Affiliation(s): Primary:
Univ. Tokyo, Geophys. Inst., Tokyo, Japan
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 62(1), p.24-40. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 25 refs.; illus. incl. 3 tables
Summary: Submarine glasses (15) from the East Pacific Rise (CYAMEX), the Kyushu-Palau Ridge (DSDP Leg 59) and the Nauru Basin (DSDP Leg 61) were analysed for noble-gas contents and isotopic ratios. Both the CYAMEX and Leg 59 samples showed Ne excess relative to Ar and a monotonic decrease from Xe to Ar when compared with noble-gas abundance. The characteristic noble-gas abundance pattern is interpreted to be due to a two-stage degassing from a noble-gas reservoir with originally atmospheric abundance. In the Leg 59 sample, noble gases are nearly 10 times more abundant than in the CYAMEX. This may be due to an oceanic crust contamination in the former mantle source. There is no correlation between the He content and that of other noble gases in the CYAMEX samples, suggesting that He was derived independently from a larger region. Except where radiogenic isotopes are involved, all other noble gas isotopic ratios were indistinguishable from air noble-gas isotopic ratios. 3He/4He in CYAMEX shows a uniform ratio of (1.21 + or - 0.07) X 10-5, while the 40Ar/36Ar ratio ranges 700-5600.
Year of Publication: 1983
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Ar-40/Ar-36; Argon; CYAMEX; Deep Sea Drilling Project; East Pacific; East Pacific Rise; Geochemistry; Glasses; He-4/He-3; Helium; IPOD; Igneous rocks; Isotopes; Kr-86/Kr-84; Krypton; Kyushu-Palau Ridge; Lava; Leg 59; Leg 61; Marine geology; Nauru Basin; Ne-22/Ne-20; Neon; Noble gases; North Pacific; Northwest Pacific; Oceanography; Pacific Ocean; Philippine Sea; Pillow lava; Ratios; Stable isotopes; Volcanic rocks; West Pacific; Xe-132/Xe-131; Xenon
Coordinates: N150000 N190000 E1450000 E1320000
N070000 N080000 E1660000 E1650000
Record ID: 1983029775
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom