TY - JOUR
T1 - Geophysical investigation using gravity data in Kinigi geothermal field, northwest Rwanda
AU - Uwiduhaye, Jean d.Amour
AU - Mizunaga, Hideki
AU - Saibi, Hakim
N1 - Funding Information:
Authors express their gratitude to Japan International Cooperation Agency ( JICA ) for financial support for the field work and for KIZUNA-program. The first author expresses his gratitude to Mr. Honda MITSURU, Dr. Saito HIROKI (West Japan Engineering Consultants, Inc.) and Endo SUSUMU (Mitsubishi Material Techno Corporation) for their technical advices during the field work. First author thanks also Rwanda Energy Group Limited for all supports. The authors thank Dr. Joseph Batir for reviewing and enhancing the quality of the paper.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/3
Y1 - 2018/3
N2 - A land gravity survey was carried out in the Kinigi geothermal field, Northwest Rwanda using 184 gravity stations during August and September, 2015. The aim of the gravity survey was to understand the subsurface structure and its relation to the observed surface manifestations in the study area. The complete Bouguer Gravity anomaly was produced with a reduction density of 2.4 g/cm3. Bouguer anomalies ranging from −52 to −35 mGals were observed in the study area with relatively high anomalies in the east and northwest zones while low anomalies are observed in the southwest side of the studied area. A decrease of 17 mGals is observed in the southwestern part of the study area and caused by the low-density of the Tertiary rocks. Horizontal gradient, tilt angle and analytical signal methods were applied to the observed gravity data and showed that Mubona, Mpenge and Cyabararika surface springs are structurally controlled while Rubindi spring is not. The integrated results of gravity gradient interpretation methods delineated a dominant geological structure trending in the NW-SE, which is in agreement with the regional geological trend. The results of this gravity study will help aid future geothermal exploration and development in the Kinigi geothermal field.
AB - A land gravity survey was carried out in the Kinigi geothermal field, Northwest Rwanda using 184 gravity stations during August and September, 2015. The aim of the gravity survey was to understand the subsurface structure and its relation to the observed surface manifestations in the study area. The complete Bouguer Gravity anomaly was produced with a reduction density of 2.4 g/cm3. Bouguer anomalies ranging from −52 to −35 mGals were observed in the study area with relatively high anomalies in the east and northwest zones while low anomalies are observed in the southwest side of the studied area. A decrease of 17 mGals is observed in the southwestern part of the study area and caused by the low-density of the Tertiary rocks. Horizontal gradient, tilt angle and analytical signal methods were applied to the observed gravity data and showed that Mubona, Mpenge and Cyabararika surface springs are structurally controlled while Rubindi spring is not. The integrated results of gravity gradient interpretation methods delineated a dominant geological structure trending in the NW-SE, which is in agreement with the regional geological trend. The results of this gravity study will help aid future geothermal exploration and development in the Kinigi geothermal field.
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U2 - 10.1016/j.jafrearsci.2017.12.016
DO - 10.1016/j.jafrearsci.2017.12.016
M3 - Article
AN - SCOPUS:85042166892
SN - 1464-343X
VL - 139
SP - 184
EP - 192
JO - Journal of African Earth Sciences
JF - Journal of African Earth Sciences
ER -