2017年1月28日
Viscosity of mafic magmas at high pressures
Geophysical Research Letters
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- ,
- ,
- 巻
- 44
- 号
- 2
- 開始ページ
- 818
- 終了ページ
- 826
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/2016GL071600
- 出版者・発行元
- American Geophysical Union ({AGU})
While it is accepted that silica-rich melts behave anomalously with a decrease of their viscosity at increased pressures (P), the viscosity of silica-poor melts is much less constrained. However, modeling of mantle melts dynamics throughout Earth's history, including the magma ocean era, requires precise knowledge of the viscous properties of silica-poor magmas. We extend here our previous measurements on fayalite melt to natural end-members pyroxenite melts (MgSiO3 and CaSiO3) using in situ X-ray radiography up to 8GPa. For all compositions, viscosity decreases with P, rapidly below 5GPa and slowly above. The magnitude of the viscosity decrease is larger for pyroxene melts than for fayalite melt and larger for the Ca end-member within pyroxene melts. The anomalous viscosity decrease appears to be a universal behavior for magmas up to 13GPa, while the P dependence of viscosity beyond this remains to be measured. These results imply that mantle melts are very pervasive at depth.
- リンク情報
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- DOI
- https://doi.org/10.1002/2016GL071600
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000395652600027&DestApp=WOS_CPL
- Scopus Url
- http://www.scopus.com/inward/record.url?eid=2-s2.0-85010992182&partnerID=MN8TOARS 本文へのリンクあり
- URL
- http://orcid.org/0000-0001-5916-7524
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85010992182&origin=inward
- ID情報
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- DOI : 10.1002/2016GL071600
- ISSN : 0094-8276
- eISSN : 1944-8007
- ORCIDのPut Code : 43577662
- SCOPUS ID : 85010992182
- Web of Science ID : WOS:000395652600027