Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409316k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 9, CiteID L09316
Mathematics
Logic
4
Geochemistry: Magma Genesis And Partial Melting (3619), Geochemistry: Fluid And Melt Inclusion Geochemistry, Geochemistry: Major And Trace Element Geochemistry, Mineralogy And Petrology: Magma Chamber Processes (1036), Mineralogy And Petrology: Magma Genesis And Partial Melting (1037)
Scientific paper
Kimberlites, the deepest terrestrial magmas and the principal source of diamonds, must have low viscosity and high buoyancy, which govern their exceptionally fast transport from mantle depths to the surface. Appreciation of the rheological properties of kimberlite magmas relies on research into their temperatures and compositions. Understanding of the alkali and volatile element budget is central to these studies, but is hampered by contaminated and altered compositions of kimberlites worldwide. Kimberlites of the diamondiferous Udachnaya-East pipe (Siberia) are exceptionally fresh, with low H2O (<0.5 wt%), but high CO2 (up to 14 wt%), Cl (up to 6 wt%), and alkalies (up to 6 wt% Na2O and 2.0 wt% K2O). After crystallization of olivine the kimberlite melt evolved towards essentially carbonate-chloride compositions. The groundmass assemblage and compositions of the Udachnaya-East kimberlite resemble modern halogen-rich natrocarbonatite lavas from the Oldoinyo Lengai volcano. Rheological measurements on the Oldoinyo Lengai lavas can be used to constrain properties of the kimberlite magma.
Golovin Alexander V.
Kamenetsky Maya B.
Kamenetsky Vadim S.
Sharygin Victor V.
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