Investigating the Lake Bosumtwi impact structure: Insight from numerical modeling

摘要: [1] The current topography of the Lake Bosumtwi crater and some its structural dimensions have been determined by geophysical methods. We combine these data with sophisticated numerical models to evaluate cratering process itself (for example, melt tektite generation) as well test modeling code. The maps show asymmetry in plan view, main anomaly north center. simulations early stage asymmetric patterns only ejecta distributions, while late is modeled for vertical impact without any asymmetry. estimate projectile size from scaling laws then, varying material properties, reproduce a crater, which similar Bosumtwi, but too deep. Bulking allows us reconcile differences between model results observed topography. Shock estimates are good agreement magnetic signature. Modeled distribution tektites assumes an angle 30°–45° direction N-NE. combination field evidence not provides necessary information upcoming scientific drilling structure also suggests interesting well-suited drill sites. Besides central uplift annular moat suggested thick breccia cover, at location anomalies comparison downrange transversal locations will provide new insight into preimpact impact-induced asymmetries.