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SUMMARY:Silicate liquid immiscibility in tholeiitic basalt - Bernard Charl
 ier\, MIT
DTSTART:20111129T163000Z
DTEND:20111129T173000Z
UID:TALK33068@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Liquid-liquid unmixing and the separation of Fe- and Si-rich l
 iquids occur during the\nevolution of tholeiitic basalt to rhyolite. We wi
 ll report evidence from plutonic and volcanic\nsettings to revive the init
 ial idea by Daly to explain the dearth of intermediate magmatic\ncompositi
 ons at the Earth’s surface. New crystallization experiments on evolved t
 holeiitic\nbasalts are used to define the compositional space for the deve
 lopment of silicate liquid\nimmiscibility on liquid lines of descent relev
 ant for typical fractionated MORB\, Iceland\,\nDeccan\, Mull and Snake Riv
 er Plain lavas and for the Sept Iles layered intrusion where large-\nscale
  immiscibility has been recognized. Crystallization conditions favouring o
 r inhibiting the\ndevelopment of immiscibility will be discussed\, as well
  as implications for magma chamber\nprocesses and tholeiitic liquid trends
 .\n\nCharlier B\, Namur O\, Toplis MJ\, Schiano P\, Cluzel N\, Higgins MD\
 , Vander Auwera J (2011)\nLarge-scale silicate liquid immiscibility during
  differentiation of tholeiitic basalt to granite\nand the origin of the Da
 ly gap. Geology 39\, 907-910.\nHolness MB\, Stripp G\, Humphreys MCS\, Vek
 sler IV\, Nielsen TFD\, Tegner C (2011) Silicate\nliquid immiscibility wit
 hin the crystal mush: late-stage magmatic microstructures in the\nSkaergaa
 rd intrusion\, East Greenland. Journal of Petrology 52\, 175-222.\nPhilpot
 ts AR (1982) Compositions of immiscible liquids in volcanic rocks. Contrib
 utions to\nMineralogy and Petrology 80\, 201-218.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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