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SUMMARY:The geologic history of seawater d18O - Professor Itay Halevy - We
 izmann Institute in Israel
DTSTART:20181112T110000Z
DTEND:20181112T120000Z
UID:TALK114526@talks.cam.ac.uk
CONTACT:Andy Buckley
DESCRIPTION:A 10-15‰ secular trend in the d18O of marine sedimentary roc
 ks (e.g.\, carbonate rocks\, cherts) over Earth history has been ascribed 
 to higher early surface temperatures or to a more 18O-depleted early ocean
 . This longstanding debate has persisted due to the dual effect of tempera
 ture and solution d18O on the oxygen isotope composition of marine precipi
 tates. We constructed a new record of marine iron oxide d18O values\, whic
 h suggests that the early ocean was 18O-depleted\, and that the early clim
 ate was cool.
LOCATION: Harker 2\, Department of Earth Sciences\, Downing Street
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