Magnetic, gravimetric, TDEM and magnetotelluric joint interpretation at the Luhoi geothermal field, Tanzania

We show the interpretation of the gravimetric, magnetic, TDEM and magnetotelluric geophysical campaign carried out to better constrain the geothermal conceptual model of the Luhoi geothermal field in Tanzania. Geophysical modelling has imaged a NE trending horst 1 km wide and 5 km long formed by the denser Kipatimu (Lower Cretaceous) sandstones surrounded by the Upper Cretaceous Ruaruke claystones down-thrown up to 1 km by normal faulting. Ruaruke claystones show low resistivity (1-10 Ohm m) primarily due to its clay content, while the Kipatimu sandstones have generally higher resistivity (10-30 Ohm m) because of their prevalent electrolytic conduction