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Abstract

Summary

The Kiejo-Mbaka geothermal prospect (Tanzania) lies along the eastern margin of the late-Miocene Karonga Rift Basin, and is part of the Rungwe Volcanic Province.

The prospect is characterised by an uplifted and oucropping block of Precambrian Gneiss basement, limited towards SW by the NW-trending, SW- dipping Mbaka Fault.

The geothermal manifestations mainly consist of hot springs occurring along this fault.

To get a detailed assessment of the prospect, a geophysical survey has been carried out by TGDC (Tanzania Geothermal Development Company), under the supervision of ELC-Electroconsult (Italy). 2/3D gravity modelling depicted the structure of the basement, consistent with a tilted and uplifted block of the Karonga half-graben. The high-density block (3000 kg/m3) is surrounded by lower density regions (2500 kg/m3), lying beneath the plain SE of the Mbaka Fault and NE of it.

Magnetotelluric analysis indicated strong 3D conditions and yx-component phase beyond 90 degrees. 3D modelling identified a resistive body (>2000 Ohm m) deepening towards SW and representing the Gneiss basement, and conductive zones (<10 Ohm m) surrounding it.

We then found a strict correlation between the low-density and high-conductivity regions. This leads to hypothesise the presence of syn/post rift sediments possibly hosting a geothermal reservoir.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201902508
2019-09-08
2024-04-26

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201902508
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Geophysical Exploration of the Kiejo-Mbaka Geothermal Field (Tanzania)
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201902508
/content/papers/10.3997/2214-4609.201902508
/content/papers/10.3997/2214-4609.201902508
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