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Stable mineral assemblages of igneous rocks: a method of calculation [Libro electrónico] / autor: Alfred Rittmann

Por: Rittmann, Alfred [autor/a].
Tipo de material: Libro en línea Libro en línea Series Editor: New York, New York, United States: Springer, c1973Descripción: xiv, 262 páginas : ilustraciones ; 24 centímetros.ISBN: 0387060308; 9783642654848 (Print); 9783642654824 (Online).Tema(s): Igneous rocks | MineralogyNota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso Nota de bibliografía: Incluye bibliografía e índice: páginas 249-251 Número de sistema: 56027Contenidos:Mostrar Resumen:
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This book represents the results of a lengthy study which Professor ALFRED RITTMANN began some thirty years ago. The relationship between the 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 calculation of the CI.P.W. norm system is essentially chemical in nature. The compositions of the stoichiometrically ideal "normative minerals" do not correspond to those of the constituent minerals found in rocks. Although the "norm" is not intended to equal the "mode" or actual mineral composition of a rock, at least a qualitative agreement between the norm and the mode is desirable. For a number of rocks and rock groups, especially the leucocratic and silicic rocks, the deviation of the norm from the mode is generally within tolerable limits. For the melanocratic and highly subsilicic rocks, on the other hand, the CI.P. W. scheme of calculation too often yields results which fail to reflect the observed mineral composition. The anomalies produced in the cal­ culation of extremely subsilicic volcanic rocks have recently been briefly discussed by F. CHAVES and H. S. YODER, JR. (1971).

Recurso en línea: http://link.springer.com/openurl?genre=book&isbn=978-3-642-65484-8
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Incluye bibliografía e índice: páginas 249-251

1. Introduction.. 2. Igneous rock facies.. 3. Basic principles of the calculation.. 4. Igneous rock forming minerals.. 5. Use of the key tables.. 6. Heteromorphism and systematics.. 7. Comparison between the stable mineral assemblage and the mode.. 8. Keys for calculation.. 9. Examples.. 10. Appendix.. 11. Comparison of the C.I.P.W. Norm with the Rittman norm.. 12. ALGOL program for the computation of the Rittman norm.. 13. Application of the Rittman norm method to petrological problems.. Subject Index

Disponible para usuarios de ECOSUR con su clave de acceso

This book represents the results of a lengthy study which Professor ALFRED RITTMANN began some thirty years ago. The relationship between the 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 calculation of the CI.P.W. norm system is essentially chemical in nature. The compositions of the stoichiometrically ideal "normative minerals" do not correspond to those of the constituent minerals found in rocks. Although the "norm" is not intended to equal the "mode" or actual mineral composition of a rock, at least a qualitative agreement between the norm and the mode is desirable. For a number of rocks and rock groups, especially the leucocratic and silicic rocks, the deviation of the norm from the mode is generally within tolerable limits. For the melanocratic and highly subsilicic rocks, on the other hand, the CI.P. W. scheme of calculation too often yields results which fail to reflect the observed mineral composition. The anomalies produced in the cal­ culation of extremely subsilicic volcanic rocks have recently been briefly discussed by F. CHAVES and H. S. YODER, JR. (1971). eng

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