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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Stable Mineral Assemblages of Igneous Rocks: A Method of Calculation

Stable Mineral Assemblages of Igneous Rocks: A Method of Calculation

Rittmann, A.
Gottini, V.
Hewers, W.

Paperback

Series: Minerals, Rocks and Mountains, Book 7

Geology

ISBN10: 3642654843
ISBN13: 9783642654848
Publisher: Springer Nature
Published: Nov 15 2011
Pages: 264
Weight: 0.84
Height: 0.60 Width: 6.00 Depth: 9.00
Language: English
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).

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