Joint inversions of two VTEM surveys using quasi-3D TDEM and 3D magnetic inversion algorithms
Vlad Kaminski 1 3 Domenico Di Massa 2 Andrea Viezzoli 11 Aarhus Geophysics, Aps, Lollandsgade 52, Aarhus, DK-8000, Denmark.
2 Department of Earth, Environment and Resources Sciences, University of Naples Federico II, Largo San Marcellino 10, Naples 80138, Italy.
3 Corresponding author. Email: vlad.kaminski@aarhusgeo.com
Exploration Geophysics 47(4) 260-268 https://doi.org/10.1071/EG16014
Submitted: 7 February 2016 Accepted: 31 March 2016 Published: 30 May 2016
Abstract
In the current paper, we present results of a joint quasi-three-dimensional (quasi-3D) inversion of two versatile time domain electromagnetic (VTEM) datasets, as well as a joint 3D inversion of associated aeromagnetic datasets, from two surveys flown six years apart from one another (2007 and 2013) over a volcanogenic massive sulphide gold (VMS-Au) prospect in northern Ontario, Canada. The time domain electromagnetic (TDEM) data were inverted jointly using the spatially constrained inversion (SCI) approach. In order to increase the coherency in the model space, a calibration parameter was added. This was followed by a joint inversion of the total magnetic intensity (TMI) data extracted from the two surveys. The results of the inversions have been studied and matched with the known geology, adding some new valuable information to the ongoing mineral exploration initiative.
Key words: airborne EM, inversion, magnetics, TDEM, VMS.
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