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SUMMARY:Assessing volatile heterogeneity in the Icelandic mantle and trans
 port of volatiles from mantle to surface - Saemundur Halldorsson\, Univers
 ity of Iceland
DTSTART:20170214T120000Z
DTEND:20170214T130000Z
UID:TALK70335@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Assessing primary volatile heterogeneity of the mantle beneath
  Icelandic is an essential requirement before the role of secondary modifi
 cations following the release and transport of volatiles from the mantle-c
 rust system\, can be evaluated. Recently published stable isotope data (δ
 D\, δ15N and δ37C) suggest that the Icelandic mantle samples at least tw
 o distinct mantle volatile reservoirs that (i) preserve the geochemical si
 gnatures of Earth's heterogeneous accretion and (ii) show strong evidence 
 for recycled crustal material trapped by the Iceland plume source. Our ong
 oing work\, involving a suite of subglacially erupted basalts along with m
 elt inclusions and sulfide minerals present in mafic minerals from primiti
 ve Icelandic basalts\, on the stable isotopic composition of H2O (δD)\, O
  (δ18O) and S (δ33S\, δ34S and δ36S)\, aims at evaluating volatile het
 erogeneity present in the Icelandic mantle. By combining our results with 
 trace element ratios (H2O/Ce\, Cl/Nb and S/Dy) and radiogenic isotopes (Sr
 \, Nd\, Hf and Pb)\, we can test for modification of mantle-derived stable
  isotope values and constrain better the degree of volatile heterogeneity 
 in Iceland mantle and\, in particular the mantle plume source.\n\n*Sæmund
 ur A. Halldórsson\, Jaime D. Barnes\, Andri Stefánsson\, David R. Hilton
 \, Erik H. Hauri\, Edward W. Marshall\, 2016. Subducted lithosphere contro
 ls halogen enrichments in the Iceland mantle plume source. Geology 44\, 67
 9-682\, doi:10.1130/G37924.1.\n\n*Sæmundur A. Halldórsson\, David R. Hil
 ton\, Peter H. Barry\, Evelyn Füri and Karl Grönvold\, 2016. Recycling o
 f crustal material by the Iceland mantle plume: new evidence from nitrogen
  elemental and isotope systematics of subglacial basalts. Geochemica Cosmo
 chimica Acta\, Volume 176\, Pages 206-226. doi:10.1016/j.gca.2015.12.021.\
 n\n*Lydia J. Hallis\, Gary R. Huss\, Kazuhide Nagashima\, G. Jeffrey Taylo
 r\, Sæmundur Ari Halldórsson\, David R. Hilton\, Mike J. Mottl and Karen
  J. Meech 2015. Evidence for primordial water in Earth’s deep mantle. Sc
 ience. Volume 350\, 6262\, 795-797\, doi: 10.1126/science.aac4834.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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