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EMinar: Alan Jones - Anatomy of an Anomaly: The North American Central Plains anomaly from initial discovery to understanding, and from craton to grain scales
The North American Central Plains conductivity anomaly (NACP) is one of the world's major geophysical anomalies. Discovered completely serendipitously in the late-1960s by Ian Gough and colleagues, it was tracked to northern Canada using geomagnetic depth sounding (GDS) arrays to the mid-1970s.
Its spatial correlation with geological structures exposed in northern Canada led to the profound suggestion by Adrian Camfield and Ian Gough in 1977 that beneath the plains of central North America lay a relic of the suturing of eastern and western cratonic blocks. This was a revolutionary idea that none before had made.
This suggestion was subsequently verified through drilling that indeed the NACP lies wholly within the Paleoproterozoic Trans-Hudson Orogen that sutured the Superior Province to the east with the Wyoming and Rae/Hearne provinces to the west.
Following GDS studies in northern Canada showed that the NACP turned eastwards into Hudson Bay.
Magnetotelluric studies of the NACP commenced in the mid-1980s through to the mid-1990s, and a total of five MT profiles were acquired across the NACP in Canada. Then a dense MT array was acquired across the NACP in North Dakota.
This webinar will present all of the work on the NACP leading to understanding its formation and nature.

Oct 20, 2021 02:00 PM in Universal Time UTC

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