Noble gas systematics of the hawaiian volcanoes based on the analysis of Loihi, Kilauea and Koolau submarine rocks

Ichiro Kaneoka, Takeshi Hanyu, Junji Yamamoto, Yayoi N. Miura

研究成果: Chapter in Book/Report/Conference proceedingChapter

20 被引用数 (Scopus)

抄録

Noble gas isotopes were analyzed for glass and olivine phenocrysts of Hawaiian submarine volcanic rocks collected at depths of 2300-5700 m using submersibles "Shinkai 6500" and "Kaiko". Both crushing and heating methods were used for extracting noble gases. Loihi samples had 3He/4He of 21-32 Ra, 20Ne/22Ne of 10-12 and 40Ar/36Ar of 300-2700, while Kilauea samples had 3He/4He of 13-15 Ra, 20Ne/22Ne of 10.6-11.1, and 40Ar/36Ar of 800-3600. For all samples analyzed, the 129Xe/130Xe cannot be distinguished from the atmospheric value within analytical uncertainty. Olivine separates from two Koolau basaltic rocks collected at depths of about 3600 m and 3100 m have 3He/4He of about 19 Ra, whereas other Koolau samples collected at depths of less than 3000 m have 3He/4He of 14-15 Ra like subaerial Koolau rocks. The samples collected from Loihi, in the pre-shield stage, contain both higher and more variable values of 3He/He compared to the shield-building stage of other volcanoes in the Hawaiian chain. The post-shield and rejuvenated stages show the lowest 3He/4He, overlapping values obtained for MORB. We interpret this age trend to reflect an increasing degree of interaction between the rising plume magma and the uppermost part of asthenosphere. The extreme He isotope variation shown at Loihi may represent additional interaction of the plume magma with the old, altered oceanic crust. The variation of heavier noble gases may indicate incorporation of seawater into the magma before eruption.

本文言語英語
ホスト出版物のタイトルHawaiian Volcanoes
ホスト出版物のサブタイトルDeep Underwater Perspectives, 2002
編集者Michael O. Garcia, Eiichi Takahashi, Jiro Naka, Peter W. Lipman, Shigeo Aramaki
出版社Blackwell Publishing Ltd.
ページ373-389
ページ数17
ISBN(電子版)9781118668436
ISBN(印刷版)9780875909875
DOI
出版ステータス出版済み - 2002
外部発表はい

出版物シリーズ

名前Geophysical Monograph Series
128
ISSN(印刷版)0065-8448
ISSN(電子版)2328-8779

All Science Journal Classification (ASJC) codes

  • 地球物理学

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