JMDMT #2417 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - magnetic data, aided by a large seismic and petrophysical data base, along two near-perpendicular traverses across the Vredefort impact structure, which includes the Witwatersrand Basin. The procedure for the integrated modeling is described in detail in [1]. A background crustal model was derived from refraction seismic data [2] and the known surface geology corresponding rock physical properties [3,4], and selected vibroseis profiles were used as constraints. The onset of crustal deformation of the Vredefort impact event is seen in the reflection seismic section across the northwestern part of the Witwatersrand Basin [5] and was used to constrain the region of crustal perturbation. As a result, the impact-related basin has a diameter of 250 km, preserved in the present SW-NE