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SUMMARY:Can a Record of Ocean Chemistry be Preserved in the Oceanic Crust?
  - Dr Sasha Turchyn\, University of Cambridge
DTSTART:20220207T180000Z
DTEND:20220207T190000Z
UID:TALK170345@talks.cam.ac.uk
CONTACT:Eloise Matthews
DESCRIPTION:"The oxygen isotopic composition of the ocean varies over rece
 nt times (last 30-50 million years) as a function of ice volume but whethe
 r it varies over longer geological time (last 600 million years) remains u
 ncertain and records suggest different things. Here I will discuss an atte
 mpt to reconstruct the oxygen isotopic composition of hydrothermal vent fl
 uid recorded in quartz and epidote veins formed in ancient oceanic crust a
 nd preserved in ophiolites. High temperature vent fluids are evolved from 
 seawater through water-rock interaction and if this can be accurately mode
 lled then the composition of seawater can be known. I will discuss new app
 roaches we are using involving reactive transport models to understand the
  controls on water-rock interaction and chemical evolution in hydrothermal
  systems."
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences\, Downing S
 ite
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