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A 3D Gravity Model of the Bosumtwi Impact Structure

Introduction: The Bosumtwi impact crater is located in Ghana. It has a rim-to-rim diameter of 10.5 km and is completely filled by Lake Bosumtwi, which has a diameter of 8 km and a maximum depth of 75 m [1]. With an age of 1.07 Ma it is one of the youngest large impact craters with well established age on Earth and within the planetary system [2]. It is well preserved and due to its excavation in early Proterozoic crystalline rock, it is more comparable to lunar and planetary impact craters than other terrestrial craters that were excavated in sedimentary target rocks. The crater was drilled in September-October 2004 as part of the International Continental Drilling Program – ICDP, and therefore a vast amount of geoscience data is available from the pre-site surveys and the actual drilling. A 3D model was constructed from the integration of gravity, petrophysics and seismic data. The results obtained from the model are compared to the morphometric parameters obtained from numerical modelling [3] and scaling laws.