Airborne ice-penetrating radar has mapped a 31-km impact structure beneath Greenland's Hiawatha Glacier. Published 40Ar/39Ar dating of impact melt gives it an age of about 58 million years, not 55 million. In the video, Thackeray argues that the crater's relatively fresh morphology and the absence of basal ice older than roughly 12,800 years make that age difficult to reconcile with the evidence. Pettke et al. (2020, not 2013) reported platinum peaks near the Younger Dryas onset in Greenland ice cores. The video argues that the Hiawatha structure and this platinum anomaly support a Younger Dryas impact. Thackeray also compares Hiawatha with the roughly 35-million-year-old, heavily eroded Chesapeake Bay impact structure.
Thackeray argues Hiawatha and Greenland platinum support Younger Dryas impact
GreenlandTheory
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Key facts
- Airborne ice-penetrating radar mapped a 31-kilometer-wide circular bedrock depression beneath Hiawatha Glacier.
- Published 40Ar/39Ar dating of Hiawatha impact melt gives an age of about 58 million years (58 ± 6 Ma), not 55 million years.
- Thackeray argues that the crater's relatively fresh morphology and the lack of basal ice older than about 12,800 years conflict with the published Eocene age.
- The Pettke et al. study reporting platinum peaks near the Younger Dryas onset in Greenland ice cores was published in 2020, not 2013.
- The Younger Dryas began approximately 12,800–12,900 years ago.
- The roughly 35-million-year-old Chesapeake Bay impact structure is heavily eroded and about 60% as old as Hiawatha's published age, but this comparison does not establish a Younger Dryas impact.
Sources
Hiawatha Glacieren.wikipedia.org
Hiawatha Glacier attracted attention in 2018 because of the discovery of a crater beneath the surface of the ice sheet in the area. A publication noted in 1952 ...
Effect of ice sheet thickness on formation of the Hiawatha ...sciencedirect.com
by EA Silber · 2021 · Cited by 14 — Hiawatha is a 31 km wide putative impact crater found below the Greenland Ice Sheet. • The impact should produce a trace of distal rocky ejecta ...
A Late Paleocene age for Greenland's Hiawatha impact ...science.org
The ~31-km-wide Hiawatha structure, located beneath Hiawatha Glacier in northwestern Greenland, has been proposed as an impact structure that may have formed ...
The Hiawatha Impact Cratersvs.gsfc.nasa.gov
The Hiawatha impact crater is potentially one of the youngest large impact craters on Earth. more than 31 kilometers across. The size of the ...
Crater Beneath Greenland Glacier Is 58 million Years ...news.climate.columbia.edu
In 2018, researchers discovered a massive, 19-mile-wide crater concealed beneath the Greenland ice sheet. A March 2022 study used argon-age ...
Hiawatha Impact Cratercraterexplorer.ca
From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has ...
The mysterious Hiawatha crater in Greenland is 58 million ...sciencenews.org
The powerful impact that created a mysterious crater at the northwestern edge of Greenland's ice sheet happened about 58 million years ago, ...
Meteorite Crater Discovered Under Greenland Icespaceref.com
... Hiawatha Glacier and map the crater and the overlying ice with a state-of-the-art ice-penetrating radar provided by the University of Kansas. MacGregor, who ...
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