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SUMMARY:Sulphur stories from the land\, sulfur stories from the sea - Dr G
 uillaume Paris\, University of Lorraine
DTSTART:20260303T120000Z
DTEND:20260303T130000Z
UID:TALK243070@talks.cam.ac.uk
CONTACT:Marie-Laure Bagard
DESCRIPTION:The sulfur cycle is one of the main contributors to the contro
 l of O2 and CO2 atmospheric levels during Earth's history. It interacts wi
 th both the carbon and oxygen cycles during weathering on land and diagene
 sis in the ocean. It is thus paramount to reconstruct accurately its varia
 tions in the past. To do so\, sulfur isotope ratios in carbonates are an i
 ncreasingly used archive\, though major questions remains about (1) how su
 lfur isotope ratios are recorded in carbonate\, (2) how well they are pres
 erved and (3) what they mean. \n\nI will present recent progress about how
  sulfate is incorporated in carbonates and a few examples of paleoenvironm
 ental investigations\, both on land and in the ocean. In continental envir
 onments\, carbonates help retrace the origin of sulfur and understand the 
 role of sulfuric acid in diagenetical processes. In oceanic sediments\, re
 liably reconstructing past sulfur isotope ratios of seawater from carbonat
 es will help to unpack various steps of diagenetic alteration and thus col
 lect key information about the activity of microorganisms in deep ocean se
 diments. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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