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SUMMARY:MANTLE PLUMES AND GLOBAL MANTLE DYNAMICS: INSIGHTS FROM FULL WAVEF
 ORM TOMOGRAPHY - Barbara Romanowicz\, UC Berkeley
DTSTART:20241204T140000Z
DTEND:20241204T150000Z
UID:TALK222391@talks.cam.ac.uk
CONTACT:Tom Merry
DESCRIPTION:In the last decade\, broad\, vertically oriented low velocity 
 conduits\, originating at the core-mantle boundary\, have been imaged seis
 mically beneath major hotspots and interpreted as deep mantle plumes. Like
 wise in the upper mantle\, horizontally elongated low-velocity channels al
 igned with the absolute plate motion with a spacing of ~1800-2000 km have 
 been documented beneath the young parts of the Pacific Ocean. We present t
 he results of a targeted higher resolution full waveform tomography study 
 of the whole mantle beneath the central and southern Atlantic ocean\, that
  brings these features into increased focus\, and suggests interaction of 
 deep mantle flow with meso-scale flow in the upper mantle that is at least
  partially driven from below. We discuss the possible source(s) of isotope
  geochemical signatures found in the lavas of several major hotspots on th
 e eastern side of the Atlantic and the nature of the large low shear veloc
 ity provinces (LLSVPs) at the base of the mantle\, that are more likely bu
 ndles of plumes rooted in patches of distinct composition\, rather than un
 broken piles extending high into the mantle.
LOCATION:Wolfson Lecture Theatre
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