doi:10.1144/GSL.SP.1989.042.01.19 1989; v. 42; p. 313-345 Geological Society, London, Special Publications S.-s. Sun and W. F. McDonough implications for mantle composition and processes Chemical and isotopic systematics of oceanic basalts: Geological Society, London, Special Publications service Email alerting article to receive free email alerts when new articles cite this click here request Permission to seek permission to re-use all or part of this article click here Subscribe Publications or the Lyell Collection to subscribe to Geological Society, London, Special click here Notes Downloaded by University of Maryland on 24 March 2008 London © 1989 Geological Society of