| DOI: | 10.1002/2014GL060088
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| 论文题名: | Decompression melting driving intraplate volcanism in Australia: Evidence from magnetotelluric sounding |
| 作者: | Aivazpourporgou S.; Thiel S.; Hayman P.C.; Moresi L.N.; Heinson G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9061
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| EISSN: | 1944-8792
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| 出版年: | 2015
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| 卷: | 42, 期:2 | | 起始页码: | 346
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| 结束页码: | 354
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| 语种: | 英语
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| 英文关键词: | Australia
; decompression
; magnetotelluric
; melt
; shear
; volcanoes
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| Scopus关键词: | Magnetotellurics
; Melting
; Shear flow
; Shearing
; Volcanoes
; Australia
; Decompression
; Decompression melting
; Lithospheric thickness
; Magnetotelluric
; Magnetotelluric soundings
; Mantle lithosphere
; Southeast australia
; Structural geology
; accretion
; lithosphere
; magnetotelluric method
; mantle convection
; melting
; plate tectonics
; volcanism
; Australia
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| 英文摘要: | A long-period magnetotelluric (MT) survey, with 39 sites covering an area of 270 by 150 km, has identified melt within the thinned lithosphere of Pleistocene-Holocene Newer Volcanics Province (NVP) in southeast Australia, which has been variously attributed to mantle plume activity or edge-driven mantle convection. Two-dimensional inversions from the MT array imaged a low-resistivity anomaly (10-30Ωm) beneath the NVP at ∼40-80 km depth, which is consistent with the presence of ∼1.5-4% partial melt in the lithosphere, but inconsistent with elevated iron content, metasomatism products or a hot spot. The conductive zone is located within thin juvenile oceanic mantle lithosphere, which was accreted onto thicker Proterozoic continental mantle lithosphere. We propose that the NVP owes its origin to decompression melting within the asthenosphere, promoted by lithospheric thickness variations in conjunction with rapid shear, where asthenospheric material is drawn by shear flow at a "step" at the base of the lithosphere. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923637170&doi=10.1002%2f2014GL060088&partnerID=40&md5=05a4f06c66c4c799177846cd88705b1a
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8677
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | School of Earth Atmosphere and Environment, Monash University, Clayton, VIC, Australia
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| Recommended Citation: | |
Aivazpourporgou S.,Thiel S.,Hayman P.C.,et al. Decompression melting driving intraplate volcanism in Australia: Evidence from magnetotelluric sounding[J]. Geophysical Research Letters,2015-01-01,42(2).
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