title: Locating the depth of magma supply for volcanic eruptions, insights from Mt. Cameroon.
abstract: Mt. Cameroon is one of the most active volcanoes in Africa and poses a possible threat to about half a million people in the area, yet knowledge of the volcano's underlying magma supply system is sparse. To characterize Mt. Cameroon's magma plumbing system, we employed mineral-melt equilibrium thermobarometry on the products of the volcano's two most recent eruptions of 1999 and 2000. Our results suggest pre-eruptive magma storage between 20 and 39 km beneath Mt. Cameroon, which corresponds to the Moho level and below. Additionally, the 1999 eruption products reveal several shallow magma pockets between 3 and 12 km depth, which are not detected in the 2000 lavas. This implies that small-volume magma batches actively migrate through the plumbing system during repose intervals. Evolving and migrating magma parcels potentially cause temporary unrest and short-lived explosive outbursts, and may be remobilized during major eruptions that are fed from sub-Moho magma reservoirs.
authors.affiliation: Centre for Experimental Mineralogy, Petrology and Geochemistry (CEMPEG), Department of Earth Sciences, Uppsala University, Villavägen 16, SE 752 36, Uppsala, Sweden.
authors.forename: Harri
authors.initials: H
authors.lastname: Geiger
authors.affiliation: Centre for Experimental Mineralogy, Petrology and Geochemistry (CEMPEG), Department of Earth Sciences, Uppsala University, Villavägen 16, SE 752 36, Uppsala, Sweden.
authors.forename: Abigail K
authors.initials: AK
authors.lastname: Barker
authors.affiliation: Centre for Experimental Mineralogy, Petrology and Geochemistry (CEMPEG), Department of Earth Sciences, Uppsala University, Villavägen 16, SE 752 36, Uppsala, Sweden.|University of Las Palmas de Gran Canaria, Department of Physics (GEOVOL), Las Palmas de Gran Canaria, Spain.
authors.forename: Valentin R
authors.initials: VR
authors.lastname: Troll