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SUMMARY:Mineralogical Controls on Earth's Climate - Caroline Peacock (Leed
 s)
DTSTART:20200204T120000Z
DTEND:20200204T130000Z
UID:TALK136714@talks.cam.ac.uk
CONTACT:Oliver Shorttle
DESCRIPTION:Trace metals are essential for life and the concentration of t
 race metals in the surface oceans regulates photosynthetic activity\, whic
 h in turn regulates the drawdown of atmospheric carbon dioxide and ultimat
 ely climate. The processes governing the concentration of trace metals in 
 the oceans are complex but in most cases the ocean sediments provide an im
 portant sink for these bio-essential elements\, locking up trace metals wi
 th sediment minerals. The iron and manganese minerals are particularly rea
 ctive towards trace metals and can exert a primary control on trace metal 
 concentrations in the sediments and overlying water column. Investigating 
 the processes by which trace metals become locked into these minerals\, an
 d whether trace metals are retained or released by these minerals as they 
 age and change with time\, is critical to understanding the role of marine
  sediments in the carbon cycle and climate. This talk will introduce the i
 mportance of trace metals in the ocean system\, the importance and peculia
 rities of marine sediment minerals\, the processes by which trace metals a
 re scavenged by these intriguing phases\, and what happens to trace metals
  as these phases change during sediment diagenesis. We will see that the g
 lobal scale cycling of trace metals in the oceans is governed by molecular
  scale interactions between trace metals and minerals.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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