BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Microstructures in Layered Intrusions – What Can They Tell Us? (
 Evidence from the Sept Iles intrusion\, Quebec\, Canada) - Halley Keevil
DTSTART:20130516T121000Z
DTEND:20130516T130000Z
UID:TALK43774@talks.cam.ac.uk
CONTACT:Sven Friedemann
DESCRIPTION:The 564 million year-old Sept Iles layered intrusion is a ferr
 obasaltic mafic igneous intrusion located in Quebec\, Canada. Ferrobasalts
  form the parent magmas of many important layered mafic intrusions such as
  the Skaergaard in Greenland and the Bushveld in South Africa\, which cont
 ains the world’s richest reserves of platinum group elements\, Fe\, Cr\,
  Ti and V. There are many contrasting ideas when it comes to the formation
  of layered intrusions: the liquid lines of descent\, the processes that f
 orm the igneous layering\, and the thickness and development of the crysta
 l mush layer are just a few of the contentious issues amongst igneous petr
 ologists. In order to help tease apart the late-stage magmatic history of 
 the Sept Iles intrusion\, microstructural evidence from the rocks must be 
 incorporated into the existing natural and experimental evidence. In the S
 ept Iles intrusion\, abundant microstructural evidence is present in the f
 orm of symplectites\, “vermicular intergrowths” that can form on the e
 dges of mineral grains from the breakdown of unstable phases. The spatial 
 distribution of the symplectites as well as their geochemistry are being a
 nalyzed and related to large-scale magma chamber processes in order to gai
 n a better understanding of the magmatic history of the Sept Iles intrusio
 n. 
LOCATION:1 Newnham Terrace\, Darwin College
END:VEVENT
END:VCALENDAR