VKC May 2022 - Dr. Seogi Kang (Stanford University) скачать в хорошем качестве

VKC May 2022 - Dr. Seogi Kang (Stanford University)

DO-27 kimberlite near Lac de Gras in the central Slave Craton, NWT, Canada, is one of a few examples where airborne geophysics led to the discovery of a kimberlite body, DO-27 was a challenging target located under the lake and overlaid by the thick overburden (~50 m). Following the discovery, more airborne geophysical data including gravity and electromagnetic (EM) data have been acquired. In this presentation, I report on a new successful approach that constructs a 3D pseudo-geologic model delineating kimberlite units including volcaniclastic kimberlite (VK), hypabyssal kimberlite (HK), and pyroclastic kimberlite (PK). This new methodology was based on four physical property models including density, magnetic susceptibility, resistivity, and chargeability obtained from the multiple airborne geophysical data. Our geophysical model showed a good match to the geological model demonstrating the value of the airborne geophysical methods to delineate kimberlite units. In particular, the chargeable volumes obtained from the EM data played an important role in delineating the diamondiferous PK unit.