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SUMMARY:The Moon as an Archive of Collisional Processes in the inner Solar
  System: New Views from Apollo Samples and Lunar Meteorites - Dr Katherine
  Joy\, University of Manchester
DTSTART:20180123T120000Z
DTEND:20180123T130000Z
UID:TALK73221@talks.cam.ac.uk
CONTACT:37221
DESCRIPTION:The Moon is an archive of impact cratering in the Solar System
  throughout the past 4.5 billion years. The lunar impact record itself is 
 controversial with several different models proposed to explain past impac
 t flux. All of the Moon's large impact basins were formed between 4.5 Ga a
 nd ~3.8 Ga. However\, the duration and magnitude of basin-formation is not
  well known. It may be that there was a sudden spike in bombardment betwee
 n ~3.9 to 3.8 Ga when many basins formed (this is known as the lunar catac
 lysm hypothesis)\, or it could be that there was a period of late heavy bo
 mbardment lasting from ~4.2 to 3.8 Ga. Lunar meteorite samples provide a k
 ey record of impact cratering processes from regions outside of those samp
 led by the Apollo missions. We are currently studying the makeup and Ar-is
 otope age record of impact melts in several lunar meteorites to test globa
 l models of impact bombardment and investigate compositional heterogeneity
  of the lunar crust. In addition to further constraining the Moon's impact
  history\, we have also investigated the record of asteroid and cometary m
 aterial found on the  Moon.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences\, Downing S
 ite
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