DOI: 10.1002/2014GL060000
论文题名: Magnetotelluric imaging of upper crustal partial melt at Tendaho graben in Afar, Ethiopia
作者: Didana Y.L. ; Thiel S. ; Heinson G.
刊名: Geophysical Research Letters
ISSN: 0094-10079
EISSN: 1944-9810
出版年: 2014
卷: 41, 期: 9 起始页码: 3089
结束页码: 3095
语种: 英语
英文关键词: continental rifting
; Ethiopia
; magnetotellurics
; partial melt
; Tendaho
Scopus关键词: Geothermal energy
; Tectonics
; Continental rifting
; Ethiopia
; Hydrothermal fluids
; Magnetotelluric imaging
; Partial melt
; Resistivity modeling
; Tendaho
; Two Dimensional (2 D)
; Magnetotellurics
; geochemical method
; hydrothermal activity
; magmatism
; magnetotelluric method
; numerical model
; two-dimensional modeling
; volume
; Afar
; Ethiopia
; Tendaho Graben
英文摘要: We report on a recent magnetotelluric (MT) survey across the Manda Hararo magmatic segment (MHMS) within the Tendaho graben in the Afar Depression in northeastern Ethiopia. Twenty-two broadband MT sites with ∼1 km station spacing were deployed along a profile with the recorded data covering a period range from 0.003 s to 1000 s. A two-dimensional (2-D) resistivity model reveals an upper crustal fracture zone (fault) and partial melt with resistivity of 1-10Ωm at a depth of >1 km. The partial melt has a maximum horizontal width of 15 km and extends to a depth of 15 km within the Afar Stratoid Series basalts. We estimate a melt fraction of about 13% based on geochemical and borehole data, and bulk resistivity from the 2-D MT inversion model. The interpreted upper crustal partial melt may have been formed by either a magma intrusion from mantle sources or a large volume of continental crust that has been fluxed by a small amount of mantle melt and heat. Within the MHMS and Tendaho graben, a magma intrusion is a plausible explanation for the upper crustal conductor. The inferred presence of a conductive fracture zone or fault with hydrothermal fluid and shallow heat sourcing magma reservoir also makes the Tendaho graben a promising prospect for the development of conventional hydrothermal geothermal energy. Key Points Upper crustal partial melt is imaged by magnetotellurics at Tendaho graben Greater than 10% partial melt in the upper crust Possible fluid pathway or fracture zone in the crust © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901912406&doi=10.1002%2f2014GL060000&partnerID=40&md5=f8efcca214383a18a93e52bb8a062466
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7343
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, Australia
Recommended Citation:
Didana Y.L.,Thiel S.,Heinson G.. Magnetotelluric imaging of upper crustal partial melt at Tendaho graben in Afar, Ethiopia[J]. Geophysical Research Letters,2014-01-01,41(9).