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CATEGORIES:Mineral Sciences Seminars
SUMMARY:Calculated phase equilibria in high pressure metam
 orphic rocks and the deep mantle - Tim Holland (De
 partment of Earth Sciences)
DTSTART;TZID=Europe/London:20101115T160000
DTEND;TZID=Europe/London:20101115T170000
UID:TALK26582AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/26582
DESCRIPTION:It is now possible to calculate quite complex phas
 e diagrams for natural rocks of basic\, ultrabasic
 \, pelitic and carbonate bulk compositions with th
 e possibility of inferring the P −T − t history wi
 thin orogeny. In other ways we still have far to g
 o. The improvement in internally- consistent therm
 odynamic datasets for the end-members of minerals 
 in real solid solutions has advanced our knowledge
  and ability to understand metamorphic rocks. Impr
 ovements in activity-composition relations have br
 ought much needed realism to such calculations\, b
 ut these models are still in their infancy. It is 
 increasingly clear that mineral solid solutions ne
 ed to be modelled in larger chemical systems to yi
 eld reliable information\, and so the mixing prope
 rties will require significant work in future. In a
 ddition\, the thermodynamic models are being exten
 ded to include a number of deep mantle phases and 
 should be well-suited to predicting pseudosections
  for realistic bulk compositions at deep mantle co
 nditions. \n\nReferences \nGreen\, E.\, Powell\, R
 . & Holland\, T. 2007. An order-disorder model for
  omphacitic pyroxenes in the system jadeite–diopsi
 de-hedenbergite–acmite\, with applications to eclo
 gitic \nrocks. American Mineralogist\, 92\, 1181–1
 189. \n\nHarte\, B (2010) Diamond formation in the
  deep mantle: the record of mineral inclusions  an
 d their distribution in relation to mantle dehydra
 tion zones. Mineralogical Magazine\,  74\, 189–215
 . \n\nHolland\, T.J.B. & Powell\, R. 2010. An impr
 oved and extended internally-consistent thermodyna
 mic dataset for phases of petrological interest\, 
 involving a new equation of state \nfor solids. Jo
 urnal of Metamorphic Geology\, in press. 
LOCATION:Harker 2 lecture room\, Department of Earth Scienc
 es\, Downing Site
CONTACT:Ian Farnan
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