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SUMMARY:Volcanic-Magmatic Interplays on Mid-Ocean Ridge Construction and P
 etrogenesis - Ken Rubin\, University of Hawaii
DTSTART:20110510T153000Z
DTEND:20110510T163000Z
UID:TALK28048@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Erupted compositions at mid ocean ridges reflect a series of i
 ncompletely understood processes that influence both magma compositions an
 d crustal construction in predictable ways.  Although global variations in
  MORB compositions are rooted in the underlying mantle\, much of what is e
 rupted at ridges has been significantly and systematically modified by pro
 cesses in the crust\, which vary systematically as functions of parameters
  such as melt supply\, magma recharge\, hydrothermal cooling rate\, and up
 permost magma chamber depth. Geochemical studies of individual mid-ocean r
 idge eruptions provide high spatial and temporal resolution snapshots of t
 hese processes\, and the diversity of extant conditions in these magmatic 
 systems at any point in time.  Short-lived radioisotope tracers indicate t
 hat magma generation and transport through the mantle and crust can be qui
 te rapid (decades to centuries)\, suggesting that steady state conditions 
 are unlikely to exist anywhere on the system for very long\, with implicat
 ions for eruption frequency and the longevity of marine hydrothermal syste
 ms.
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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