Figure S2. Simplified estimate of Kfs abundance in ejecta blankets, primary deposit thickness and distribution across contemporary continental landmasses for meteorite impact events with age uncertainty < ±20 Myr. Evaluating the influence of meteorite impact events on global potassium feldspar availability to the atmosphere since 600 Ma.

2018-10-03T19:50:41Z (GMT) by B.C. Coldwell M.J. Pankhurst
Figure S2. Simplified estimate of Kfs abundance in ejecta blankets, primary deposit thickness and distribution across contemporary continental landmasses for meteorite impact events with age uncertainty < ±20 Myr. Thirty-five craters are presented (a–ai) in decreasing age order, taken to be the determined age in the case of radiometric assessments and halfway between age limits in the case of age bracketing. Age reported is that used for continental reconstruction. Accuracy of palaeolocation of impact site decreases overall with increasing age and as a function of plate reconstruction model uncertainty. Calculated primary ejecta blanket thicknesses are plotted as isopachs from 1 cm to 10 µm, coloured fields indicate summarised Kfs content and regions of minimum ejecta thickness. See text for calculation assumptions and other limitations. Robinson projection (non equal-area) is used for presentation purposes.