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SUMMARY:A Twenty-first Century View of Plutons - Prof. Allen Glazner\, MSA
  Distinguished Lecturer\, University of North Carolina
DTSTART:20190312T120000Z
DTEND:20190312T130000Z
UID:TALK108433@talks.cam.ac.uk
CONTACT:Owen Weller
DESCRIPTION:Granite plutons are fundamental building blocks of the Earth
 ’s crust\, and most non-plutonic rocks descended from plutonic ancestors
 . The centuries-old textbook understanding of plutons\, reinforced by myri
 ad “big red blob” cartoons\, is that they are the frozen remains of ra
 pidly intruded\, km-scale tanks of magma\, and that such tanks underlie ac
 tive volcanoes. In this talk I will argue that this central concept about 
 the Earth is contradicted by a growing body of data from multiple fields\;
  that big-red-blob cartoons are misleading and pernicious\; and that as a 
 consequence many of the underpinnings of petrology need to be rethought. O
 ops! Recognition that plutons are emplaced in small increments and that mo
 st are heavily modified by a metamorphic overprint reconciles pluton geolo
 gy with data from geochemistry\, geochronology\, geophysics\, geodetics\, 
 and volcanology. It is time to move beyond big red blobs.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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