| DOI: | 10.1002/grl.50486
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| 论文题名: | Electrical conductors in Archean mantle-Result of plume interaction? |
| 作者: | Thiel S.; Heinson G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8873
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| EISSN: | 1944-8604
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| 出版年: | 2013
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| 卷: | 40, 期:12 | | 起始页码: | 2947
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| 结束页码: | 2952
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| 语种: | 英语
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| 英文关键词: | 3D inversion
; electrical resistivity
; magnetotellurics
; mantle
; Proterozoic
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| Scopus关键词: | 3-d inversions
; Electrical conductors
; High-electrical resistivities
; Magnetotelluric data
; mantle
; Proterozoic
; Resistivity images
; Tectono-thermal event
; Magnetotellurics
; Telluric prospecting
; Three dimensional
; Electric conductivity
; Archean
; crystal structure
; data set
; electrical conductivity
; electrical resistivity
; iron
; magnetotelluric method
; mantle
; partial melting
; plume
; Proterozoic
; Australia
; Gawler Craton
; South Australia
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| 英文摘要: | From long-period magnetotelluric data across the Gawler Craton, we obtain a three-dimensional resistivity image of the lithosphere and provide constraints on tectonothermal events dating back to the Proterozoic. Contrary to common observations of Archean cratons displaying high electrical resistivity in the mantle lithosphere, the magnetotelluric data show low resistivity of around 10Ω m at 80km depth underneath the 1595Ma Gawler Range Volcanics, a silicic large igneous province. The resistivity distribution appears to be a signature of plume-modified orogenesis with low-degree partial melting at the base of the lithosphere in a back-arc setting. The enhanced conductivity is explained through higher hydrogen and iron content in the crystal lattice and also along the grain boundaries of the mantle constituting minerals. Older, arc-related magmatism to the southwest across 1620-1610Ma St. Peter Suite does not display enhanced conductivity and suggests a depleted mantle lithosphere. The data show that Yellowstone-type mantle plume analogues are preserved through time and still display an elevated electrical signature in the lithosphere today. Key Points 3D resistivity model of the South Australian Gawler Craton is produced Mantle conductor at 80 km depth in tectonically quiet Archean craton Conductor is result of Proterozoic plume interaction and led to IOCG deposits ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880530198&doi=10.1002%2fgrl.50486&partnerID=40&md5=c0835a261b22535912cd2ec8c601ab29
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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/6137
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| Appears in Collections: | 气候减缓与适应
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作者单位: | School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia
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| Recommended Citation: | |
Thiel S.,Heinson G.. Electrical conductors in Archean mantle-Result of plume interaction?[J]. Geophysical Research Letters,2013-01-01,40(12).
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