Organic/Inorganic reactions in metamorphic processes

This paper is dedicated to Hugh Greenwood in appreciation for all he has so elegantly done to enhance our quantidti;e understanding of metasomatic processes. It was Hugh Greenwood who first explained how T-X1co,l diagra*s can be used to advantage in representing and interpreting complex phase relations in metamorphic systems (Grienwood 1962). I hope he will find Figure 15 in the present communication gratifying in this regard, because to my knowledge it is the first T-Xtco,t diigram to be published in which one of the curves represents metastable equilibrium imong minerals, a Cb21h2O fluid, and hydrocarbon species in petroleum at high temperatures and piessures. I would like to take this opportunity to publicly express my appreciation to Hugh for all he has done for me over the years, I panicularly appreciate his thoughtful, incisive, and perceptive contributions to all of the many stimulating discussions we have had. Hugh is always up for just about anything, and we've tested together many organic/inorganic fluids over the years in a determined effort to better understand our mutual perceptions of the world of metimorphic petrology. Through ir all, Hugh has been a staunch supportive friend whom I shall miss greatly as an academic colleague, but look forward to seeing often on the ski slopes and sailboats of the future. Thank you' Hugh, for sharing with us over the past 30 years or so your unselfish friendship, challenging intellect, superb craftsmanship, and unparalleled scholarship