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SUMMARY:The formation of co-genetic silica-undersaturated and silica-overs
 aturated igneous rocks: pressure\, fractional crystallisation and crustal 
 assimilation - Carrie Soderman (University of Cambridge)
DTSTART:20241028T130000Z
DTEND:20241028T140000Z
UID:TALK221326@talks.cam.ac.uk
CONTACT:Matthew Morris
DESCRIPTION:Alkaline-silicate igneous complexes can host significant resou
 rces of critical metals and contain a diversity of co-genetic rock types f
 rom silica-oversaturated (quartz normative) to silica-undersaturated (feld
 spathoid normative) compositions. The origin of these coexisting rocks is 
 an ongoing petrological problem\, due to the separation of the two regimes
  by thermal divides. Here we apply new thermodynamic models to investigate
  the co-genetic formation of these rock types using two case studies: 1) t
 he Blatchford Lake Igneous Complex (Canada)\, which also hosts a world-cla
 ss REE deposit associated with the silica-undersaturated units\; and 2) th
 e ‘giant dyke’ complexes in south Greenland\, which our group visited 
 this summer. We quantify the effects of fractionation\, crystallisation pr
 essure and crustal assimilation to identify key conditions under which evo
 lved alkaline melts\, which are optimal for critical metal mineralisation\
 , may be generated.
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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