A glacially incised canyon in Brazil: Further evidence for mid-ediacaran glaciation?
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2013
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McGee, B.
Collins, A.
Trindade, R.
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The Journal of Geology, 2013; 121(3):275-287
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Ben McGee, Alan S. Collins, and Ricardo I. F. Trindade
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Abstract
Along the Serra Azul (Blue Mountains) in Brazil, a large (∼600-m) incision surface cuts into post-Marinoan cap carbonates and into the underlying glaciogenic diamictites of the Puga Formation. The paleovalley is filled with glaciomarine sediments, notably, massive diamictite with multiply striated sandstone and mudstone lonestones of the Serra Azul Formation. Using preexisting mapping, satellite imagery, isotopic data, and new stratigraphic sections, we delineate a paleovalley that we infer to be related to a combination of isostatic rebound due to glacial erosion and sea level fall at the time of the Gaskiers glaciation. The hypothesis that a significant glaciation at this time can be observed in the geological record is consistent with global evidence presented here.
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© 2013 by The University of Chicago. All rights reserved.