Titlebook: Stable Mineral Assemblages of Igneous Rocks; A Method of Calculat Alfred Rittmann Book 1973 Springer-Verlag Berlin · Heidelberg 1973 Gestei

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c structures from both a theoretical and an experimental perspective. The purpose is to xv PREFACE xvi determine the roles of innateness and of experience in th978-94-010-7412-4978-94-009-2033-0Series ISSN 1873-0043 Series E-ISSN 2215-1788

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Book 1973 and mineralogical composition of igneous rocks is established as far as is possible. Petrographers will appreciate that this problem is extremely complex, particularly since this relationship forms the basis of the classification and nomenclature of igneous rocks. The ingenious scheme of calculatio

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Basic Principles of the Calculation,um conditions. For this purpose, analytical data of the rock-forming minerals and for host rocks were statistically evaluated. The composition of a constituent, say clino-pyroxene, found to be characteristic of a certain rock type, was used in the calculation of the stable mineral assemblage of that particular rock.

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0343-2181 e chemical and mineralogical composition of igneous rocks is established as far as is possible. Petrographers will appreciate that this problem is extremely complex, particularly since this relationship forms the basis of the classification and nomenclature of igneous rocks. The ingenious scheme of

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Introduction,y ., ., ., and . in 1903 and is known as the C.I.P.W. norm system. In this system the result of the rock analysis is converted to a standard set of normative compounds using a fixed calculation scheme. The contents of the selected compounds, taken as stoichio-metrically ideal compounds, are expresse

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Basic Principles of the Calculation,rical in character and uses average compositions of the actual minerals. These average compositions of the constituent minerals are, of course, not constant throughout all rocks but vary with the rock type. This variation, in other words the relationship between the chemical composition of the magma

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Comparison of the C.I.P.W. Norm with the Rittmann Norm,g to a fixed scheme. Most of these idealized minerals do not correspond to the natural rock-forming minerals, the composition of which is much more complicated. In order to illustrate this fact, the chemical compositions of some femic silicates are presented in Tables 1 and 2 in the form of their C.