globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116611
论文题名:
Noble gas isotopic compositions of seamount lavas from the central Chile trench: Implications for petit-spot volcanism and the lithosphere asthenosphere boundary
作者: Yamamoto J.; Hirano N.; Kurz M.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 552
语种: 英语
中文关键词: crustal assimilation ; Juan Fernández Islands ; lithosphere–asthenosphere boundary ; noble gas isotopic ratio ; petit-spot
英文关键词: Earth atmosphere ; Isotopes ; Offshore oil well production ; Submarine geology ; Volcanoes ; Basaltic glass ; Central Chile ; Earth's surface ; Hawaiian Islands ; Lithosphere-asthenosphere boundary ; Noble gas isotopes ; Noble gas isotopic composition ; Oceanic lithosphere ; Inert gases ; asthenosphere ; basalt ; crustal structure ; isotopic composition ; lava ; lithosphere ; noble gas ; seamount ; trench ; volcanic eruption ; volcanism ; Chile ; Juan Fernandez Islands ; Filicophyta
英文摘要: We report new noble gas isotopic compositions of submarine basaltic glasses sampled from two seamounts discovered offshore of Chile, and inferred to have erupted as petit-spot volcanoes near the Juan Fernández hotspot. The samples have 3He/4He of 1–15 times atmosphere (Ra). Their neon isotope compositions are similar to those of the Hawaiian Islands and Réunion Island. Their 40Ar/36Ar range from atmospheric to 2300. Although the lavas are likely to be influenced by a hotspot-related component, the cause of the 3He/4He variation must be clarified to ascertain the mantle source. Variations in 3He/4He are not attributable to processes occurring at the Earth's surface such as degassing fractionation, mixing with atmosphere dissolved in seawater, or in-situ post-eruptive addition of 4He. A combination of the Ne-Ar isotope ratios corrected for atmospheric influence and He isotope ratios indicates that the noble gas isotopes of the lavas are a mixture of a hotspot magma, MORB-source, and radiogenic components. The lower 3He/4He are attributed to assimilation with the oceanic lithosphere, suggesting that the pristine 3He/4He of the lavas is hotspot-like. These features can be interpreted as indicating that part of the Juan Fernández plume infiltrated the lithosphere–asthenosphere boundary (LAB), and that the ponding magma has erupted as petit-spot volcanoes because of plate bending. The noble gas data indicate that LAB can be a reservoir for exotic melts, which might have lubricated plate tectonics. © 2020
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165355
Appears in Collections:气候变化与战略

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作者单位: The Hokkaido University Museum, Nishi 8, Kita 10, Kita-ku, Sapporo, 060-0810, Japan; Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai, 980-8576, Japan; Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States

Recommended Citation:
Yamamoto J.,Hirano N.,Kurz M.D.. Noble gas isotopic compositions of seamount lavas from the central Chile trench: Implications for petit-spot volcanism and the lithosphere asthenosphere boundary[J]. Earth and Planetary Science Letters,2020-01-01,552
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