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DTSTAMP:20250627T063612Z
DESCRIPTION:Peter Crockford\n\nDepartment of Earth Sciences\, Carleton Univ
 ersity\n\nFriday\, November 3\n\n11- 12pm \n\nFDA 232\n\nThe Geologic Hist
 ory of Earth's Biosphere\n\nAbstract: \n\nA grand challenge in the study o
 f Earth’s past has been to reconstruct its history of oxygenation. This ch
 allenge has arisen as a consequence of a diminution of well-preserved sedi
 mentary rocks back in geologic time. This lack of materials has led to the
  enduring controversy surrounding the texture of Earth’s oxygenation\, and
  as an outcome\, intense debate regarding specific oxygen levels across Ea
 rth’s early history. In this proposal I am seeking to understand Earth’s r
 edox history immediately after Earth’s Great Oxidation Event. Here dispara
 te signals have been reported from sediments of ≈2 Ga age\, with samples f
 rom the Union Island Group deposited on the shores of Great Slave Lake dis
 playing signatures of oxygenation and those from the Kasegalik Formation o
 f the Belcher Islands not. One possible way to reconcile these discrepant 
 records is to determine the degree to which they are recording global seaw
 ater or whether they are instead isolated basins recording local signature
 s. However\, it is only until recently that geochemical tools to make such
  distinctions have been possible. If funded\, this proposal seeks to apply
  new geochemical tools (triple oxygen isotopes of carbonate associated sul
 fate and barium isotopes in carbonates) to carbonates from both locations 
 to determine their local or global nature.  Specifically\, funding will be
  utilized for one field expedition to Great Slave Lake and the analysis of
  collected samples along with samples from the Kasegalik Fm. which are cur
 rently at Carleton University.\n\n \n
DTSTART:20231103T150000Z
DTEND:20231103T160000Z
SUMMARY:EPS Seminar Series: Peter Crockford 
URL:/eps/channels/event/eps-seminar-series-peter-crock
 ford-352373
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