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Tracer diffusion kinetics at 1 atm pressure under dry conditions using 6 Li, 41 K, and 87 Rb in four plagioclase feldspars have been determined. Diffusion profiles were measured using an ion microprobe (SIMS). The Arrhenius parameters and ± 2σ uncertainties for Li, K, and Rb, respectively, in albite, are: pre-exponential factor (log D 0 ) = -3.8 ± 1.0;...
Experiments on a chilled marginal rock from the Kiglapait Intrusion, Labrador, have been performed in order to constrain the partitioning behaviour of major and trace elements during formation of Kiglapait Lower Zone (LZ) cumulates. At 0.1 MPa and f O2 close to FMQ, the liquidus is bracketed between 1225 and 1212°C and the only liquidus phases are plagioclase (An 73- ...
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