Fig. 4: A Moho depth map of the Abitibi greenstone belt, derived from the three-dimensional density model in this study.
From: Archean rifts and triple-junctions revealed by gravity modeling of the southern Superior Craton
A The depth to the Moho, contoured at 500 m intervals. Major faults and VMS deposit locations are overlain on the map. B A histogram of the Moho depth based on a 5 km grid spacing and the Moho depth below the known VMS deposits. C The observed and predicted processed Bouguer anomaly data along the profile in A. D A cross-section through the density model along the line shown in A. A shallowing of the Moho below the Noranda and Matagami VMS districts is evident. The subsurface fault geometry is from the Lithoprobe sections40 and magnetotelluric modeling71. The lower panel in D is a 5:1 vertically exaggerated plot of the Moho topography, that highlights the variations. LLCfz Larder Lake-Cadillac fault zone, PDfz Porcupine-Dester fault zone, Chfz Chicobi fault zone, CBfz Casa Berardi fault zone, NBfz Northern Boundary fault zone.
