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SUMMARY:    Subaerial salt extrusions in Iran as analogues of ice sheets\,
  streams &amp\; glaciers - Christopher Talbot (Earth Sciences\, University
  of Uppsala)
DTSTART:20091202T163000Z
DTEND:20091202T173000Z
UID:TALK20979@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:Ice (H20) and salt (halite\, NaCl) form by different processes
  in mutually exclusive environments but share many physical properties and
  resemble each other in hand specimens and en-masse. Layyers of salt have 
 to be buried by kilometres of other rocks over millions of years before th
 ey rise to the surface in piercing structures (diapirs) many of which extr
 ude flows that simulate glaciers. Seismic profiles have revealed 1000s suc
 h salt sheets in over 35 basins worldwide in the last 25 years. As most of
  these are submarine the focus here will be on subaerial rivers of salt (n
 amakiers) exposed in the deserts of Iran. Glaciers and namakiers will be c
 ompared and contrasted. Clear grain shape fabrics map streamlines that hel
 p understand how folds develop inside namakiers. Namakiers surge like glac
 iers but within 20 minutes of their TOP surfaces being wet by rain that ca
 nnot reach the basal contact.
LOCATION:Scott Polar Research Institute\, LIBRARY (1ST FLOOR)
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