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Glacial buzz-saws, gold in fool's gold, fingerprints in sea water, and fluvial iron
Date:10/19/2013

ture behavior of the ice sheet is of global concern. However, limited data on the past dynamics of the Ice Sheet exceeding the ice-core records have led to partly contradictory reconstructions. Whereas the Scoresby Sund sector of the Greenland Ice Sheet has been suggested to be stable and not much larger than at present during the peak Pleistocene glaciations, the southeastern sector of the Ice Sheet has been inferred to be much more dynamic. Jan Sverre Laberg, Matthias Forwick, Katrine Husum, and Tove Nielsen present seismic data showing that glaciogenic debris-flow deposits dominate the earlier than ca. 2.58 Ma succession of the Scoresby Sund Trough Mouth Fan on the East Greenland continental margin, suggesting much more frequent expansions of the Greenland Ice Sheet to the shelf break than found previously. This rapid response of the glacier to climate forcing indicates how dynamic is the glacier ice front and what one might expect of the glacier as the influences of climate warming become more pronounced.


Riverine mixing and fluvial iron formation: A new type of Precambrian biochemical sediment
Peir K. Pufahl et al., Department of Earth and Environmental Science, Acadia University, Wolfville, Nova Scotia B4P 2R6, Canada; peir.pufahl@acadiau.ca. Co-authors: Franco Pirajno, and Eric E. Hiatt. Posted online ahead of print 16 Oct. 2013; http://dx.doi.org/10.1130/G34812.1.

The deposition of Precambrian iron formation is perhaps one of the least understood phenomena in the Earth sciences. This iron-rich sedimentary rock precipitated in some way from seawater and therefore holds important clues about the composition of the early oceans and atmosphere as well as the evolution of life. For example, the appearance of large, economically important iron formations reflects photosynthetic oxygenation of the oceans and atmosphere
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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