Enhanced and Asymmetric Melting Beneath the Southern Mariana Back‐Arc Spreading Center Under the Influence of Pacific Plate Subduction

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書誌事項

タイトル別名
  • Enhanced and Asymmetric Melting Beneath the Southern Mariana Back-Arc Spreading Center Under the Influence of Pacific Plate Subduction
公開日
2022-05-05
資源種別
journal article
権利情報
  • © 2022. American Geophysical Union. All Rights Reserved.
  • This is the peer reviewed version of the following article: Matsuno, T., Seama, N., Shindo, H. P., Nogi, Y., & Okino, K. (2022). Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading center under the influence of Pacific plate subduction. Journal of Geophysical Research: Solid Earth, 127, e2021JB022374., which has been published in final form at https://doi.org/10.1029/2021JB022374. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
DOI
  • 10.1029/2021jb022374
公開者
American Geophysical Union

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説明

The back-arc spreading at the southern Mariana is categorized as slow, but surface morphological and geophysical features of the spreading centers suggest that the spreading process is associated with enhanced melting in the upper mantle, due to water being derived from the subducted Pacific slab. A marine magnetotelluric experiment was performed along a transect across a segment at 13°N to reveal the key processes of melting, dehydration, and dynamics in the upper mantle, and their relationships to the surface characteristics. Our inversion model of electrical resistivity shows (a) a conductive body at 10–20 km depth beneath the spreading axis, and (b) another conductive area expanding asymmetrically under and around the conductive body. Away from the spreading center, there is (c) a resistive area thickening up to ∼40 km on the remnant arc side, and (d) another resistive area with a constant thickness of ∼150 km on the trench side. Implications of these model features are (a) a melt body beneath the spreading axis; (b) a hydrous mantle above the subducted slab and asymmetric passive decompression melting in the mantle wedge; (c) a residual mantle off from the spreading axis; and (d) a cold mantle wedge tip and the subducted Pacific mantle. The structure markedly contrasts with that in the central Mariana Trough at 18°N, suggesting that the horizontal distance between the location of the spreading center and the root of the buoyant upwelling above the subducted slab is a key parameter that controls the mantle dynamics beneath the back-arc spreading.

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