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|Title:||Magnetotelluric imaging of upper crustal partial melt at Tendaho graben in Afar, Ethiopia|
|Citation:||Geophysical Research Letters, 2014; 41(9):3089-3095|
|Publisher:||American Geophysical Union|
|Yohannes Lemma Didana, Stephan Thiel, and Graham Heinson|
|Abstract:||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.|
|Rights:||© 2014. American Geophysical Union. All Rights Reserved.|
|Appears in Collections:||Aurora harvest 7|
Geology & Geophysics publications
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