HR: 0800h
AN: V31C-0602    [Abstracts]
TI: Experimental Studies on Rutile Solubility
AU: * Rapp, J F
EM: j.f.rapp@sms.ed.ac.uk
AF: University of Edinburgh, School of Geoscience, Grant Institute, Kings Buildings, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
AU: Klemme, S
EM: stephan.klemme@ed.ac.uk
AF: University of Edinburgh, School of Geoscience, Grant Institute, Kings Buildings, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
AU: Butler, I B
EM: ian.butler@ed.ac.uk
AF: University of Edinburgh, School of Geoscience, Grant Institute, Kings Buildings, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
AU: Harley, S L
EM: simon.harley@ed.ac.uk
AF: University of Edinburgh, School of Geoscience, Grant Institute, Kings Buildings, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
AB: Rutile (TiO₂) is an important high field strength element (HFSE) sequestering mineral, and has been implicated in the observed depletion of HFSE in arc magmas. It is thought that rutile is insoluble in slab-derived fluids, and remains residual in the subducted slab. Indeed, experimental data indicates a very low solubility of rutile in pure H₂O (Tropper and Manning, 2005), and this low solubility may result in HFSE depleted fluids imparting a depleted signature to arc magmas. However, there is scant experimental data available on rutile solubility in fluids of more complex compositions (Ayers and Watson, 1993). We are carrying out a systematic experimental study into the effect of specific chemical components on rutile solubility in fluids and also silicate melts. This should further our understanding of HFSE mobility in metamorphic rocks within subduction zones. References: J. C. Ayers and E. B. Watson (1993) Rutile solubility in supercritical aqueous fluids and the high P-T mobility of elements it concentrates. Contrib. Mineral. Petrol. 114, 321-330. P. Tropper and C. E. Manning (2005) Very low solubility of rutile in H₂O at high pressure and temperature, and its implications for Ti mobility in subduction zones. American Mineralogist 90(2-3), 502-505.
DE: 3613 Subduction zone processes (1031, 3060, 8170, 8413)
DE: 3630 Experimental mineralogy and petrology
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting