Hydrogeochemistry and hydrothermal alteration of the Hanle geothermal field, Djibouti-East Africa

Ali Ferat Bayram

Article Details

Hydrogeochemistry and hydrothermal alteration of the Hanle geothermal field, Djibouti-East Africa

Authors:

Ali Ferat Bayram

Publisher:

Pamukkale University

Main Topics:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Journal:

Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi Vol.31 Issue 3, pp.462-468

Document Type:

Article

Publication Date:

6/2025

Document Language:

English

Document ID (Org No.):

2001352066

pISSN:

2147-5881

Keywords:

Abstract:

 This study focuses on the geochemistry and hydrothermal alteration of the Hanle geothermal field Djibouti-East Africa. Water from five drinking water wells, a hot spring and a steam condensate in the Hanle graben was analyzed for major and minor hydrogeochemical parameters. Analyzed items for water samples hot spring water, groundwater, and steam condensate are pH, electric conductivity EC, SiO2, Cl, SO4, HCO3, F, Na, K, Ca, Mg, Al, Fe, B, As, δD, δ18O. Using the chemical compositions and saturation indexes of the hot springs, the reservoir temperature was estimated at around 120 to 125 C. Based on the XRD analysis, the clay minerals smectite, chlorite and illite, as well as quartz, calcite, and alunite, were determined as alteration minerals in this region, which represent high temperature environment 180 C. The obtained data suggest that the water in the Hanle region was likely formed either by the mixing of groundwater and heated fossil seawater, or by the dissolution of evaporite by heated groundwater.

 This study focuses on the geochemistry and hydrothermal alteration of the Hanle geothermal field Djibouti-East Africa. Water from five drinking water wells, a hot spring and a steam condensate in the Hanle graben was analyzed for major and minor hydrogeochemical parameters. Analyzed items for water samples hot spring water, groundwater, and steam condensate are pH, electric conductivity EC, SiO2, Cl, SO4, HCO3, F, Na, K, Ca, Mg, Al, Fe, B, As, δD, δ18O. Using the chemical compositions and saturation indexes of the hot springs, the reservoir temperature was estimated at around 120 to 125 C. Based on the XRD analysis, the clay minerals smectite, chlorite and illite, as well as quartz, calcite, and alunite, were determined as alteration minerals in this region, which represent high temperature environment 180 C. The obtained data suggest that the water in the Hanle region was likely formed either by the mixing of groundwater and heated fossil seawater, or by the dissolution of evaporite by heated groundwater.

 This study focuses on the geochemistry and hydrothermal alteration of the Hanle geothermal field Djibouti-East Africa. Water from five drinking water wells, a hot spring and a steam condensate in the Hanle graben was analyzed for major and minor hydrogeochemical parameters. Analyzed items for water samples hot spring water, groundwater, and steam condensate are pH, electric conductivity EC, SiO2, Cl, SO4, HCO3, F, Na, K, Ca, Mg, Al, Fe, B, As, δD, δ18O. Using the chemical compositions and saturation indexes of the hot springs, the reservoir temperature was estimated at around 120 to 125 C. Based on the XRD analysis, the clay minerals smectite, chlorite and illite, as well as quartz, calcite, and alunite, were determined as alteration minerals in this region, which represent high temperature environment 180 C. The obtained data suggest that the water in the Hanle region was likely formed either by the mixing of groundwater and heated fossil seawater, or by the dissolution of evaporite by heated groundwater.

 Bu çalışmada, Hanle Jeotermal Alanının Cibuti-Doğu Afrika jeokimyası ve hidrotermal alterasyonuna dayalı olarak alanın jeotermal potansiyelinin araştırılması amaçlanmıştır. Hanle grabenindeki beş içme suyu kuyusundan, bir kaplıcadan ve bir buhar yoğuşmasından alınan sulardan hidrojeokimyasal analizler yapılmıştır pH, elektrik iletkenliği ECSiO2, Cl, SO4, HCO3, F, Na, K, Ca, Mg, Al, Fe, B, As, δD, δ18O. Bu suların doygunlukları ve çeşitli jeotermometreler kullanılarak, rezervuar sıcaklığının yaklaşık 120- 125C olduğu tahmin edilmiştir. XRD çözümlemelerinde yüksek sıcaklık ortamını 180 C temsil eden smektit, klorit ve illit türü kil mineralleri ile kuvars, kalsit ve alunit gibi alterasyon mineralleri belirlenmiştir. Elde edilen veriler, Hanle bölgesindeki suyun ya yeraltı suyu ve ısıtılmış fosil deniz suyunun karışmasıyla ya da ısıtılmış yeraltı suyunun evaporiti çözmesiyle oluşmuş olabileceğini göstermektedir.

Article Details

Hydrogeochemistry and hydrothermal alteration of the Hanle geothermal field, Djibouti-East Africa

Authors:

Ali Ferat Bayram

Publisher:

Pamukkale University

Main Topics:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Journal:

Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi Vol.31 Issue 3, pp.462-468

Document Type:

Article

Publication Date:

6/2025

Document Language:

English

Document ID (Org No.):

2001352066

pISSN:

2147-5881

Hydrothermal alteration

Hanle

Djibouti

GeochemistryHidrotermal alterasyon

Hanle

Cibuti

Jeokimya

Issues

Article Details

Authors: Ali Ferat Bayram

Publisher: Pamukkale University

Main Topics: Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Journal: Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi Vol.31 Issue 3, pp.462-468

Document Type: Article

Publication Date: 6/2025

Document Language: English

Document ID (Org No.): 2001352066

pISSN: 2147-5881

Issues

Authors:

Ali Ferat Bayram

Publisher:

Pamukkale University

Main Topics:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Journal:

Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi Vol.31 Issue 3, pp.462-468

Document Type:

Article

Publication Date:

6/2025

Document Language:

English

Document ID (Org No.):

2001352066

pISSN:

2147-5881