2016年12月16日
Electromagnetic evidence for volatile-rich upwelling beneath the society hotspot, French Polynesia
Geophysical Research Letters
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- 巻
- 43
- 号
- 23
- 開始ページ
- 12021
- 終了ページ
- 12026
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/2016GL071331
- 出版者・発行元
- Blackwell Publishing Ltd
We have conducted a seafloor magnetotelluric survey that images, for the first time, three-dimensional electrical conductivity structure in the upper mantle beneath the Society hotspot. A striking feature in our model is a high-conductivity anomaly a few hundred kilometers in diameter, which is continuous from the lowest part of the upper mantle to a depth of approximately 50 km below sea level. Using theoretical and experimental results from mineral physics, we interpret the high-conductivity anomaly as evidence of the melt fraction up to 2.2 vol.%, which is robust regardless of assumed temperature, and the existence of carbonated silicate melt beneath the hotspot. Our results suggest that the Society hotspot is a pathway for ascending volatiles from the deeper part of the upper mantle to the surface.
- リンク情報
- ID情報
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- DOI : 10.1002/2016GL071331
- ISSN : 1944-8007
- ISSN : 0094-8276
- eISSN : 1944-8007
- ORCIDのPut Code : 30416885
- SCOPUS ID : 85006176689