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Tracing the subducting Pacific slab to the mantle transition zone with hydrogen isotopes

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Title: Tracing the subducting Pacific slab to the mantle transition zone with hydrogen isotopes
Authors: Kuritani, Takeshi Browse this author
Shimizu, Kenji Browse this author
Ushikubo, Takayuki Browse this author
Xia, Qun-Ke Browse this author
Liu, Jia Browse this author
Nakagawa, Mitsuhiro Browse this author
Taniuchi, Hajime Browse this author
Sato, Eiichi Browse this author
Doi, Nobuo Browse this author
Issue Date: 21-Sep-2021
Publisher: Nature Portfolio
Journal Title: Scientific reports
Volume: 11
Issue: 1
Start Page: 18755
Publisher DOI: 10.1038/s41598-021-98307-y
Abstract: Hydrogen isotopes have been widely used as powerful tracers to understand the origin of terrestrial water and the water circulation between the surface and the deep interior of the Earth. However, further quantitative understanding is hindered due to a lack of observations about the changes in D/H ratios of a slab during subduction. Here, we report hydrogen isotope data of olivine-hosted melt inclusions from active volcanoes with variable depths (90-550 km) to the subducting Pacific slab. The results show that the D/H ratio of the slab fluid at the volcanic front is lower than that of the slab fluid just behind the volcanic front. This demonstrates that fluids with different D/H ratios were released from the crust and the underlying peridotite portions of the slab around the volcanic front. The results also show that the D/H ratios of slab fluids do not change significantly with slab depths from 300 to 550 km, which demonstrates that slab dehydration did not occur significantly beyond the arc. Our estimated delta D parts per thousand value for the slab materials that accumulated in the mantle transition zone is > - 90 parts per thousand, a value which is significantly higher than previous estimates.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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