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SUMMARY:The Siđa Formation of SE Iceland: Emplacement Processes and Depos
 itional Environment - Dr. Ian Skilling
DTSTART:20140220T163000Z
DTEND:20140220T173000Z
UID:TALK50664@talks.cam.ac.uk
CONTACT:Lois Salem
DESCRIPTION:The Siđa Formation consists of at least seven stacked sheet-l
 ike basaltic sequences comprising basal diamict\, overlying largely degass
 ed lava and uppermost hyaloclastite.  The maximum thickness of each repeat
 ed stack is about 70m\, but is widely variable\, and not all units are alw
 ays present.  The lava-hyaloclastite contact locally displays spectacular 
 flame-like intrusions (viscous fingers) of lava up to several metres in le
 ngth into the overlying hyaloclastite. There are three published models fo
 r the environment of deposition of this formation: on the continental shel
 f (Bergh and Sigvaldason\, 1991)\, beneath >900m thick ice (Smellie\, 2008
 ) and beneath thin (<200m) ice but with subaerial vent conditions (Banik e
 t al.\, 2013). This talk will review the evidence for these environments a
 nd their associated emplacement mechanisms and present some new studies on
  the lava fingers. I argue that the key to understanding the formation is 
 magma-ice interaction during voluminous fissure eruptions along the thinne
 d margins of large ice sheets.
LOCATION:Harker 2\, Earth Sciences Department
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