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SUMMARY:Deducing the Fluid Dynamical Behaviour of Ancient Magma Bodies - P
 rof Marian Holness
DTSTART:20210218T181500Z
DTEND:20210218T194500Z
UID:TALK156625@talks.cam.ac.uk
CONTACT:Jindra Jelinek
DESCRIPTION:Link to join the YouTube live stream:\n\nhttps://youtu.be/p4EF
 P0VvsGw\n\nThe fluid dynamical behaviour of magma\, either when it is trap
 ped in the crust\, or erupted at the Earth's surface\, plays a fundamental
  role in determining Earth evolution. For the most part\, however\, it is 
 not possible to directly observe whether or not magma bodies in the crust 
 convec\, or whether they are entirely static during cooling and crystallis
 ation. In this talk I will show how information about the fluid dynamical 
 behaviour of ancient\, now fully solidified\, bodies of basalt can be extr
 acted from careful observation both on the outcrop scale (1-100m) and on t
 he grain-scale (less than 1mm). I will talk about large-scale processes in
 ferred to have occurred in the km-scale Skaergaard Intrusion of East Green
 land\, and also about the fingerprint of convection preserved in small-sca
 le spatial variations of composition and microstructure in sills and dykes
  (tabular intrusions that commonly act as conduits feeding surface eruptio
 ns).
LOCATION:Online
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