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SUMMARY:The Fifth Element: Boron recycling in the Iceland mantle plume - D
 r Margaret Hartley\, University of Manchester
DTSTART:20200120T180000Z
DTEND:20200120T190000Z
UID:TALK135874@talks.cam.ac.uk
CONTACT:Natalie Forrest
DESCRIPTION:Iceland’s 500 km of active neovolcanic zones provides a high
 -resolution and spatially continuous transect across a mantle plume. Basal
 ts erupted near the plume centre carry geochemical signatures such as high
  3He/4He that suggest melting of a primitive mantle component. Yet trace e
 lements and lithophile isotope signatures also point to the presence of en
 riched\, recycled oceanic lithosphere in the Icelandic mantle source. Boro
 n is an excellent tracer of recycled material\, because it re-introduced t
 o the mantle through subduction of serpentinized oceanic lithosphere. \n\n
 In this talk I will present new boron isotope measurements from suite of c
 rystal-hosted melt inclusions from North Iceland. Do Icelandic magmas carr
 y any distinctive boron isotopic signatures indicative of recycled crustal
  material? How are mantle-derived boron isotopic signatures modified by cr
 ustal assimilation? To what extent can boron isotopic heterogeneity be res
 olved on the lengthscale of a mantle plume?
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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