Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition

Details Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713502r&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13502

Mathematics

Logic

Cryosphere: Ice Streams, Geochronology: Quaternary Geochronology, Cryosphere: Thermal Regime, Geochronology: Cosmogenic-Nuclide Exposure Dating (4918), Cryosphere: Weathering (1625, 1886)

Scientific paper

Evidence for the evolution of Laurentide Ice Sheet (LIS) basal thermal regime patterns during successive glaciations is poorly preserved in the geologic record. Here we explore a new approach to constrain the distribution of cold-based ice across central Baffin Island in the eastern Canadian Arctic over many glacial-interglacial cycles by combining till geochemistry and cosmogenic radionuclide (CRN) data. Parts of the landscaped with geomorphic evidence for limited glacial erosion are covered by till characterized by high chemical index of alteration (CIA) values and CRN concentrations requiring complicated burial-exposure histories. Till from regions scoured by glacial erosion have CIA values indistinguishable from local bedrock and CRN concentrations that can be explained by simple exposure following deglaciation. CRN modeling results based on these constraints suggest that the weathered tills were deposited by 1.9 to 1.2 Ma, and by that time the fiorded Baffin Island coastline must have developed close to its modern configuration as piracy of ice flow by the most efficient fiord systems resulted in a major shift in the basal thermal regime across the northeastern LIS. The resultant concentration of ice flow in fewer outlet systems may help explain the cause of the mid-Pleistocene transition from 41- to 100-kyr glacial cycles.

Affiliated with

Also associated with

No associations

Rating

Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reorganization of ice sheet flow patterns in Arctic Canada and the mid-Pleistocene transition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-957201