The Quaternary volcano clusters in Northeast Japan and the no-volcano zones between them imply extensive and scarce melting, respectively, in the mantle wedge, but no quantitative study on the heterogeneous melting has been conducted. Here, we constructed two-dimensional numerical models by considering along-arc temperature variations in the mantle wedge expressed as high- (hot fingers) and low-temperature anomalies (deterred corner flow) with the slab dehydration, porous flow of aqueous fluid, and partial melting of the mantle wedge. The results show that the high- and low-temperature anomalies in the mantle wedge result in extensive and negligible melting beneath the volcano clusters and no-volcano zones, respectively, consistent with geochemical and geophysical estimations. Contrary to the near-complete slab dehydration beneath the volcano clusters, the partially dehydrated subducting slab beneath the no-volcano zones transports the remaining water into the mantle transition zone, which has implications for intraplate volcanoes in Northeast Asia.
|Journal||Geophysical Research Letters|
|Publication status||Published - 2020 Apr 16|
Bibliographical noteFunding Information:
We thank the editor and two anonymous reviewers who significantly improved the manuscript. There are no financial conflicts of interest. The data used in this study are available from the sources cited in the reference. This study is supported by the National Research Foundation of Korea (Grant Numbers 2017R1A6A1A07015374, 2019R1A2C1002517, and 21A20131500002).
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All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)