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SUMMARY:The hidden meteorites of Antarctica - Geoff Evatt\, University of 
 Manchester
DTSTART:20150218T140000Z
DTEND:20150218T150000Z
UID:TALK58109@talks.cam.ac.uk
CONTACT:Jonathan Kingslake
DESCRIPTION:Antarctica contains some of the most productive regions on Ear
 th for collecting meteorites. These small regions are known as Meteorite S
 tranding Zones (MSZs)\, and they combine upward flowing ice with high wind
  ablation rates to concentrate large numbers of englacially transported me
 teorites onto their ice surface. Over the past 40+ years\, collection of t
 hese surfaced meteorites by different countries has provided invaluable in
 sights into planetary formation and evolutionary process. However\, whilst
  meteorite falls should be distributed almost uniformly across the Earth's
  surface\, meteorite collection data show that the proportion of iron-base
 d meteorites recovered from Antarctica is significantly lower than the pro
 portion recovered from the rest of the world. This indicates a terrestrial
  filtering process(es) could be at play\, whereby Antarctica's achondrite\
 , iron-rich meteorites become hidden. Here we show that englacial solar wa
 rming can cause sub-surface iron-rich meteorites to regelate down through 
 the ice\, reaching depths that can prevent the meteorites from ever emergi
 ng. This process thus reduces the proportion of iron-rich meteorites that 
 can be found upon the ice surface of the MSZs. It also indicates that laye
 rs of these meteorites may lie hidden out of view\, just underneath the MS
 Z ice surface. With meteorites being constantly englacially transported to
 wards many MSZs\, these layers could harbour an additional reserves of iro
 n-rich meteorites. If accessed\, this layer could potentially enable a sig
 nificant increase in our library of meteorite types\, thereby helping our 
 understanding of early Solar System formation processes.
LOCATION:British Antarctic Survey\, Room 330B
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