| DOI: | 10.1002/2016GL071351
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| 论文题名: | Conductivity response to intraplate deformation: Evidence for metamorphic devolatilization and crustal-scale fluid focusing |
| 作者: | Thiel S.; Soeffky P.; Krieger L.; Regenauer-Lieb K.; Peacock J.; Heinson G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8430
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| EISSN: | 1944-8161
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| 出版年: | 2016
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| 卷: | 43, 期:21 | | 起始页码: | 11236
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| 结束页码: | 11244
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| 语种: | 英语
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| 英文关键词: | deformation
; devolatilization
; electrical conductivity
; magnetotellurics
; metamorphism
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| Scopus关键词: | Deformation
; Electric conductivity
; Geodynamics
; Magnetotellurics
; Brittle ductile transitions
; Crustal conductors
; Devolatilization
; Electrical conductivity
; Enhanced conductivity
; Geodynamic modeling
; Metamorphic fluids
; metamorphism
; Tectonics
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| 英文摘要: | We present two-dimensional electrical resistivity models of two 40 km magnetotelluric (MT) profiles across the Frome Embayment to the east of the northern Flinders Ranges, South Australia. The lower crust shows low resistivity of 10 Ω m at around 30 km depth. The middle crust is dominated by resistive (>1000 Ω m) basement rocks underlying the Flinders Ranges. Adjacent to the ranges, conductive lower crust is connected to vertical zones of higher conductivity extending to just below the brittle-ductile transition at ∼10 km depth. The conductive zones narrow in the brittle upper crust and dip at roughly 45° beneath the surface. Zones of enhanced conductivity coincide with higher strain due to topographic loading and sparse seismicity. We propose that fluids are generated through neotectonic metamorphic devolatilization. Low-resistivity zones display areas of fluid pathways along either preexisting faults or an effect of crustal compression leading to metamorphic fluid generation. The lower crustal conductors are responding to long-wavelength flexure-induced strain, while the upper crustal conductors are responding to short wavelength faulting in the brittle regime. MT is a useful tool for imaging crustal strain in response to far-field stresses in an intraplate setting and provides important constraints for geodynamic modeling and crustal rheology. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84999014709&doi=10.1002%2f2016GL071351&partnerID=40&md5=90ded76857e284b35e30200f76f03159
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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/9393
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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: | Geological Survey of South Australia, Adelaide, SA, Australia
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| Recommended Citation: | |
Thiel S.,Soeffky P.,Krieger L.,et al. Conductivity response to intraplate deformation: Evidence for metamorphic devolatilization and crustal-scale fluid focusing[J]. Geophysical Research Letters,2016-01-01,43(21).
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