The interference of a deep thermal system with a shallow aquifer: the case of Sodere and Gergedi thermal springs, Main Ethiopian Rift, Ethiopia

Haile, Tigistu; Abiye, Tamiru

doi:10.1007/s10040-012-0832-8

Cited by 7 publications

(3 citation statements)

References 21 publications

(26 reference statements)

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“…Since the high conductivities in MT show zones of partial melt currently in the crust, while the gravity data are sensitive to time-averaged locus of intrusion, we suggest that the locus of magma migration from depth beneath the TMGP has changed through time. Haile and Tamiru. (2012) showed that the Gedemsa caldera hosts a geothermal system and is the heat source for the Geregendi thermal spring.…”

Section: Geothermal Heat Sources and Roles Of Subsurface Structures I...mentioning

confidence: 99%

Subsurface structural control of geothermal resources in a magmatic rift: gravity and magnetic study of the Tulu Moye geothermal prospect, Main Ethiopian Rift

et al. 2023

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Since the Quaternary, extension and magmatism in the Main Ethiopian Rift (MER) have been mainly focused into narrow magmatic segments that have numerous volcanic centers and caldera collapses that offer favorable conditions for the occurrence of geothermal resources. However, the subsurface structure of the volcanic systems (0–10 km) and their link to the distribution of shallow geothermal resources remain unclear. To investigate the role of subsurface structures on the occurrence of these resources, we conducted gravity and magnetic studies combined with geological constraints within the Tulu Moye Geothermal Prospect (TMGP), one of the current geothermal prospects in the central MER associated with caldera collapses. Gravity data from the Global Gravity Model plus (GGMplus 2013) and ground magnetic data transformed into residual and derivative maps reveal that shallow magmatic intrusions occur under the volcanic centers (Tulu Moye, Bora, and Bericha). Our interpretation along with recent magnetotelluric model suggests that only the intrusion beneath Tulu Moye is currently magmatically active and includes partial melt, consistent with it being a primary heat source for the geothermal system. A new caldera formation model is proposed where the TMGP hosts an older large caldera (about 25 km diameter) within which there are several smaller nested caldera systems associated with the Bora, Bericha, and Tulu Moye volcanoes. Along with existing geologic, seismic, and magnetotelluric studies, our gravity and magnetic analysis indicate the interaction between NNE-SSW (rift-parallel) and NW-SE (cross-rift) trending faults, along with shallow magmatic intrusions and caldera systems, suggesting that such a large geothermal system is possible under these conditions.

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Section: Geothermal Heat Sources and Roles Of Subsurface Structures I...mentioning

confidence: 99%

Subsurface structural control of geothermal resources in a magmatic rift: gravity and magnetic study of the Tulu Moye geothermal prospect, Main Ethiopian Rift

et al. 2023

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“…Natural variation of isotopic signatures can be used to determine water source and subsequent alteration processes. The origin of Ethiopian geothermal waters is predominantly from local meteoric water (Beyene, 2000; Haile & Abiye, 2012; Teclu, 2003, 2006). A generally linear relationship exists between δ 2 H and δ 18 O called the global meteoric water line (GMWL; Craig, 1961).…”

Section: Synthetic Review Of Ground and Surface Water Hydrochemical Datamentioning

confidence: 99%

Geothermal energy resources in Ethiopia: Status review and insights from hydrochemistry of surface and groundwaters

Burnside

Montcoudiol

Becker³

et al. 2021

WIREs Water

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Ethiopia has an estimated >10,000 MW of geothermal energy potential, more than double its current power generating capacity (4,400 MW). Electricity access stands at 44% of the total population, with 31% in rural areas, so effective development of this low-carbon resource could make a significant impact to equitable delivery of electricity. However, geothermal energy exploitation must be done responsibly to protect valuable water resources under stress from climate-change driven drought conditions and competing uses across agricultural, domestic, and industrial sectors. Our review provides progress updates on geothermal developments-which soon aim to deliver more than 1,000 MW of electricityand performs a high-level assessment of hydrochemical data for ground and surface waters across Ethiopia. A water quality database was built using publicly available information and three quality control criteria: well-defined sample loca-

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“…Characteristics of springs (especially hot springs) in orogenic regions are due to the interaction between water, the lithosphere, and environmental conditions like lithology, pathways, residence time underground, and many other factors. The origin of elevated temperatures in hydrothermal reservoirs (hot/warm springs) can be due to the geothermal gradient with deep circulation of groundwater through faults, chemical reactions (e.g., in evaporates and oil field brines), heat produced through radioactive decay of longlived radioactive material (isotopes), and mixing of meteoric water with magmatic water or volcanic vapour in volcanic area [1][2][3][4][5][6][7][8][9][10][11]. The hydrothermal phenomenon most often occurs where the released water and vapour are related to regional volcanic activities.…”

Section: Introductionmentioning

confidence: 99%

Geofluids Assessment of the Ayub and Shafa Hot Springs in Kopet-Dagh Zone (NE Iran): An Isotopic Geochemistry Approach

Mohammadzadeh

Kazemi

2017

Geofluids

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Geothermal energy has a wide range of uses in our life. It is very important to characterize the temperature and the depth of geothermal reservoirs. The aim of this paper is the determination of type, origin source of water temperature, and depth of water circulation in the Ayub-Peighambar and Shafa (AP and SH) hot springs, located in NE Iran, using hydrogeochemistry and environmental isotopes (2H and18O). AP hot spring has elevated temperature (36–40°C) and as such is very important for balneotherapy and geotourism industry purposes. The average values ofδ18O andδ2H for this hot spring (−10‰and −73‰, resp.) are analogous to that of geothermal and meteoric waters. This indicates that the heat source cannot be related to volcanic activities (with averageδ18O value of about 5‰) and it is most probably associated with geothermal gradient with deep circulation of groundwater through faults. Based on Na-K geothermometers coupled with isotopic (18O and2H) geochemistry the temperature of the AP geothermal reservoir was estimated to be in the range of 100–150°C with 3–5 and 4.2 kilometres’ depth, respectively. Chemically, the AP samples are CaSO4facies with a chemically homogeneous source and steam heated waters type.

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The interference of a deep thermal system with a shallow aquifer: the case of Sodere and Gergedi thermal springs, Main Ethiopian Rift, Ethiopia

Cited by 7 publications

References 21 publications

Subsurface structural control of geothermal resources in a magmatic rift: gravity and magnetic study of the Tulu Moye geothermal prospect, Main Ethiopian Rift

Subsurface structural control of geothermal resources in a magmatic rift: gravity and magnetic study of the Tulu Moye geothermal prospect, Main Ethiopian Rift

Geothermal energy resources in Ethiopia: Status review and insights from hydrochemistry of surface and groundwaters

Geofluids Assessment of the Ayub and Shafa Hot Springs in Kopet-Dagh Zone (NE Iran): An Isotopic Geochemistry Approach

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