Helium isotopes as geochemical indicators of a serpentinized fore-arc mantle wedge

Umeda, Koji; McCrank, G. F.*; Ninomiya, Atsushi

New helium isotope data from hot springs on the eastern Kyushu Island were obtained from a large number of sampling points in order to elucidate the geographical distribution of $^{3}$ He/ $^{4}$ He ratios in the fore-arc regions of Southwest Japan. Systematic, regional variations in $^{3}$ He/ $^{4}$ He ratios can be identified clearly on between Kyushu Island (0.093-0.79 R $_{rm A}$ ), Shikoku Island (0.21-2.5 R $_{rm A}$ ) and the Kii Peninsula (0.39-7.4 R $_{rm A}$ ). The overall distribution of relative mantle helium reveals a close association with the occurrence of non-volcanic deep low-frequency tremors (LFT), which would be related to the presence of upward aqueous fluids produced by slab dehydration, in Southwest Japan. A flux of $^{3}$ He carried by aqueous fluids via the mantle wedge is very low in Kyushu Island where the LFT are not found, resulting in a $^{3}$ He/ $^{4}$ He ratio lower than the atmospheric ratio.

Language	:	English
Journal	:	Journal of Geophysical Research
Volume	:	112
Number	:	B10
Pages	:	p.B10206_1 - B10206_10
Publication Year/Month	:	2007/10
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Paper URL	:	https://doi.org/10.1029/2007JB005031
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Registration No. : AA20060387
JAEA Abstracts No. : 36000173
Paper Submission No. : 3503

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