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CATEGORIES:Exoplanet Seminars
SUMMARY:Cosmic dust as a planetary fertiliser: collisional
  evolution of the prebiotic Earth - Craig Walton (
 Cambridge\, Earth Sciences)
DTSTART;TZID=Europe/London:20221101T130000
DTEND;TZID=Europe/London:20221101T140000
UID:TALK184955AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/184955
DESCRIPTION:The Earth likely experienced a greater rate of col
 lisions with extraterrestrial matter in early Sola
 r System history than it does today. This is highl
 y relevant for the chemical origins of life\, give
 n that many types of extraterrestrial matter are e
 nriched in life-​limiting elements relative to Ear
 th's crustal rocks. Unpicking this relationship re
 quires us to obtain some constraints on the dynami
 cal evolution of the Solar System (i.e.\, collisio
 n rates between asteroids and between asteroids an
 d Earth)\, the chemistry of extraterrestrial matte
 r accreted by Earth\, and the subsequent processin
 g of that matter on the surface of prebiotic Earth
 . We have investigated each of these topics\, leve
 raging isotopic analyses of meteorites from astero
 ids that experienced collisions\, geochemical meas
 urements of the fine-​grained cosmic dust particle
 s that those collisions generated\, and modelling 
 of extraterrestrial matter processing on the surfa
 ce of prebiotic Earth. Our combined approach leads
  us to better understanding of the role and releva
 nce of collisional activity in seeding planets wit
 h the elements needed for life\, suggesting that c
 osmic dust in particular represents a viable and f
 lexible planetary fertiliser.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by
  email
CONTACT:Dr Emily Sandford
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