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SUMMARY:Destruction and regrowth of lithospheric mantle beneath large igne
 ous provinces (Sedgwick Club Conference) - Simon Stephenson - University o
 f Oxford
DTSTART:20240423T103000Z
DTEND:20240423T110000Z
UID:TALK216055@talks.cam.ac.uk
CONTACT:Lucas Measures
DESCRIPTION:Large igneous provinces (LIPs) are formed by enormous (i.e.\, 
 frequently >106 km3) but short-lived magmatic events that have profound ef
 fects upon global geodynamic\, tectonic\, and environmental processes. Lit
 hospheric structure is known to modulate mantle melting\, yet its evolutio
 n during and after such dramatic periods of magmatism is poorly constraine
 d. Using geochemical and seismological observations\, we find that magmati
 sm is associated with thin (i.e.\, ≲80 km) lithosphere and we reveal a s
 triking positive correlation between the thickness of modern-day lithosphe
 re beneath LIPs and time since eruption.  Our results point to systematic 
 destruction and subsequent regrowth of lithospheric mantle during and afte
 r LIP emplacement and recratonization of the continents following eruption
 . These insights have implications for the stability\, age\, and compositi
 on of ancient\, thick\, and chemically distinct lithospheric roots\, the d
 istribution of economic resources\, and emissions of chemical species that
  force catastrophic environmental change.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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