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Appropriate Units for Expressing Chemical Composition of Igneous Rocks

By
E. H. Timothy Whitten
E. H. Timothy Whitten
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Published:
January 01, 1975

Chemical analyses should be expressed as cation or oxide weights per unit volume (instead of the traditional weights percent) for almost all chemical, petrogenetic, and economic studies of rocks. For many purposes, the use of oxide or cation weights percent may yield misleading information about the interrelations between chemical variables of igneous rocks. Apparent trends among cogenetic igneous rocks differ, or are even reversed, when expressed as weights per unit volume and as weights percent. Specific illustrations are based on published data for the Palisades and Lugar Sills and for numerous other granitic and mafic plutonic igneous masses for which density data have been published.

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GSA Memoirs

Quantitative Studies in the Geological Sciences

E. H. Timothy Whitten
E. H. Timothy Whitten
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Geological Society of America
Volume
142
ISBN print:
9780813711423
Publication date:
January 01, 1975

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