Stanley

of Earth Environmental Science, Acadia University, Wolfville, Nova Scotia, B4P 2R6 (e-maii cliff.Stanlev0 acadiau.ca) 

Keywords igneous rocks, petrographic dassification, lithogeochemistry, projective geometry, Streckeisen ternary diagrams. 

Plutonic rock classification by petrologic means is a simple procedure involving the use of Streckeisen ternary diagrams. Unfortunately, classification suffers from modal estimation errors involving visual estimates, or representativity issues from point counts or image analysis procedures applied to thin sections or slabs of insufficient size. 

In contrast, volcanic rock classification by petrologic means is generally difficult because complete crystallization is not achieved, making it impossible to use the modal rock petrography as a classification criterion. As a result, classification of volcanic rocks has historically relied on lithogeochemistry, and the most successful approaches have employed conserved, trace element concentration ratios. These have been used as proxies for petrology to empirically classify volcanic rocks. Unfortunately, these trace elements are imperfect proxies for rock 

the compositions of the essential ( 5 volume %) minerals in the rocks to be classified are defined in a composition matrix (C) and used, in conjunction with a second matrix (7) defining what minerals are employed in classification (the classifying minerals e.g., quartz, plagloclase, alkali feldspar), to obtain a third matrix (1/1/) containing a set of independent vectors containing major element coefficients. When multiplied by the un-standardized molar element quantities, they produce un-standardized molar classifying mineral quantities that are un-affected by the presence of nonclassifying minerals in the rocks. 

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Stanley H E 1971 Introduction to Phase Transitions and Critical Phenomena (Oxford Oxford University Press)... 

Stanley H E 1999 Scaling, universality and renormalization three pillars of modern critical phenomena Rev. Mod. Phys. 71 S358 Kadanoff L P 1999 Statistical Physics Statics, Dynamics and Renormalization (Singapore World Scientific)... 

Stanley H E 1999 Unsolved mysteries of water In Its liquid and glass states MRS Bull. May 22-30... 

Stanley R J and Boxer S G 1995 Oscillations in the spontaneous fluorescence from photosynthetic reaction centers J. Phys. Chem. 99 859-63... 

Stanley R J, King B and Boxer S G 1996 Excited state energy transfer pathways in photosynthetic reaction centers. 1. Structural symmetry effected. Phys. Chem. 100 12 052-9... 

Barabasi A L and Stanley H E 1995 Fractal Concepts in Surface Growth (Cambridge Cambridge University Press)... 

Stanley A. Gembicki Anil R. Oroskar James A. Johnson UOP... 

Stanley Pohl Joseph Varco Paul Wallace LeszekJ. Wolfram Clairol, Inc. 

A. Lundin, in A. Szalay, L. J. Kiicka, and P. Stanley, eds.. Bioluminescence and Chemiluminescence Status John Wdey, Sons, Ltd., Chichestei,... 

P. E. Stanley and L. J. Kricka eds.. Bioluminescence and Chemiluminescence Current Status, ]ohxi Wiley Sons, Chichester, U.K., 1991. 

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