Lithium tracer-diffusion in an alkali-basaltic melt — An ion-microprobe determination |
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| Authors: | RK Lowry SJB Reed J Nolan P Henderson JVP Long |
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| Institution: | 1. Department of Geology, Imperial College of Science and Technology, Prince Consort Road, London SW7 2BPU.K.;2. Department of Earth Sciences, University of Cambrdige, Downing Street, Cambridge CB2 3EQU.K.;3. Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BDU.K. |
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| Abstract: | An ion-microprobe-based technique has been used to measure lithium tracer-diffusion coefficients (DLi) in an alkali-basaltic melt at 1300, 1350 and 1400°C. The results can be expressed in the form:DLi=7.5 ×10?2exp(?27,600/RT)cm2S?1The results show significantly faster diffusion rates than those previously recorded for other monovalent, divalent and trivalent cations in a tholeiitic melt. Consequently, diffusive transport of ions acting over a given time in a basaltic melt can produce a wider range of transport distance values than hitherto supposed. Hence, it is concluded that great care should be exercised when applying diffusion data to petrological problems. |
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