Mapping Hydrothermal Alteration at the Fentale-Dofan Magmatic Segment of the Main Ethiopian Rift

The Main Ethiopian Rift (MER) is characterized by extensional tectonics and volcanism, associated with active hydrothermal systems, alteration fumarolic deposits. spatial distribution of these products their link faults rock types provides important clues to what controls fluid flow in the subsurface. However, little known about this East African Rift. We address issue a multidisciplinary approach Fentale-Dofan magmatic segment MER, an area intense volcanic tectonic activity geothermal prospect. Primarily we conduct mapping deposits, lithologies using surface feature classification technique multispectral satellite images. Then interpret map new database manifestations such as hot-springs fumaroles. find that deposits are mainly focused near Fentale Dofan Volcanic Complex (DVC). At DVC on rhyolites western side volcano, NNE striking, rift parallel faults. volcano ignimbrite show circular pattern around edifice, but also places follow striking Fentale, more complex association edge suggests formation contacts may localize places. both volcanoes between either ignimbrites likely due them being relatively easily altered (in comparison basalt), brittle nature allows for fracturing through which localized can occur (as opposed sediments). general stronger structural influence at respect Fentale. presence manifestations, along other lines evidence locus subsurface dike intrusion centres, suggest discrete magma reservoirs beneath heat source circulation. Our study demonstrates geology, including be successfully mapped automated remote sensing based classification.