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| Superior Glaciation | |
|---|---|
| Name | Superior Glaciation |
| Period | Paleoproterozoic |
| Region | Laurentia |
Superior Glaciation
The Superior Glaciation is interpreted as a Paleoproterozoic glacial episode affecting the Superior Province, Laurentia, Fennoscandia, Siberian Craton and parts of the Yilgarn Craton and Kaapvaal Craton, and its study intersects research on the Huronian glaciation, Paleoproterozoic era, Snowball Earth hypothesis, Sturtian glaciation, and Makganyene glaciation; scholars from institutions such as the United States Geological Survey, Geological Survey of Canada, University of Toronto, Stockholm University, and University of Cape Town contribute to debates alongside work published in journals like Nature, Science, and the Journal of Geology.
The timing of the event is constrained using radiometric dates from U-Pb dating of zircon in volcanic units interbedded with glacial deposits in the Animikie Group, Hurwitz Formation, Huronian Supergroup, Transvaal Supergroup, and sections correlated with the Saskatchewan Craton and the Slave Craton, with ages commonly cited near the Paleoproterozoic boundary and debated in relation to the Great Oxidation Event, the timing of Lomagundi-Jatuli event, and isotopic excursions reported from Isua and Svalbard stratigraphic records.
Interpreters describe a suite of glacial facies including striated pavements, roche moutonnées, tillites, dropstones, and ice-contact diamictites within the Animikie Basin, Michipicoten Greenstone Belt, Lake Superior, and coastal analogues mapped in the Scandinavian Caledonides and Greenland; these features are compared with modern analogues from the Antarctic Peninsula, Greenland Ice Sheet, Patagonia, New Zealand Southern Alps, and Alaska to infer dynamics of grounded ice, tidewater glaciers, and icebergs in settings influenced by tectonic elements such as the Midcontinent Rift System and the Keweenawan Rift.
Sedimentological analysis emphasizes diamictite-mudstone successions, graded turbidites, rhythmites, and paleosol horizons within stratigraphic sequences correlated to the Huronian Supergroup, Animikie Group, Gunflint Iron Formation, Biwabik Formation, and the Kalahari Basin analogues; stratigraphers employ chemostratigraphy including δ13C and δ34S shifts recorded alongside iron formations like the Gunflint Iron Formation and greenstone-hosted successions in the Superior Province to correlate glacial episodes across cratons and test propositions advanced in comparative studies by scholars at Oxford University, McGill University, Uppsala University, and the Smithsonian Institution.
Proxy records invoked include stable isotopes, paleomagnetic poles, cap carbonates, and erosional unconformities found in sections tied to the Superior Province, Fennoscandian Shield, and Kaapvaal Craton; these are integrated with climate model outputs from groups using General Circulation Models at Princeton University, MIT, NCAR, and ETH Zurich to evaluate hypotheses linking the glaciation to atmospheric oxygenation events documented by researchers associated with the Geological Survey of Canada and to test scenarios similar to those proposed for the Cryogenian glaciations.
The legacy of glacial erosion and deposition reshaped drainage patterns such as those feeding Lake Superior, the Great Lakes Basin, the Saint Lawrence River, and analogous Paleoproterozoic paleodrainage, influencing later Proterozoic sediment routing into basins studied by the Canadian Shield research community and impacting ore-forming environments relevant to mineral provinces like the Iron Range, Bushveld Complex proximity studies, and exploration programs at companies including Teck Resources and Vale.
Key contributions to understanding derive from field campaigns led by geologists affiliated with Harvard University, University of Minnesota, Dalhousie University, University of Pretoria, and national surveys, with pivotal papers in Nature and Geology and seminal mapping by the Geological Survey of Canada and the United States Geological Survey; advances in geochronology at facilities such as the Los Alamos National Laboratory, Lamont–Doherty Earth Observatory, and Canadian Light Source and syntheses by authors publishing through presses like Cambridge University Press and Springer continue to refine correlations, stimulate debates with proponents of global glaciation scenarios, and drive interdisciplinary work linking paleobiology, geochemistry, and tectonics exemplified by collaborations involving NASA research programs and international consortia.
Category:Glaciology Category:Paleoproterozoic events