Computers applied to the chemical classification of igneous rocks. C.l.P.W. and NIGGLI methods
DOI:
https://doi.org/10.32685/0120-1425/bolgeol20.3.1972.368Keywords:
Colombia, classification calculations, igneous rocks, magma, economic possibilities, magmatic provinces
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Copyright (c) 1972 Servicio Geológico Colombiano
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
There are several methods to classify rocks according to their chemical analysis. One of the most used has been C.I.P. W., which gives a theoretical calculated or normative composition. As opposed to the actual or modal composition of the same.
This classification would indicate a theoretical composition of the magma that gave rise to the current rock.
Due to the extensive calculations necessary to determine the constituents of the standard and then the calculations to classify the rock, it was necessary to divide the program into two parts. In the first part the necessary calculations are made to determine the number of evils of each standard’s constituents. In the second part, taking as data the results of the first program, the rock classification is made.
With the present work, a wider application of computers to Geology is examined. In addition, simplifying the necessary calculations for the chemical classification of igneous rocks allows for a more detailed study of the igneous rocks to examine the economic possibilities of the magmas that gave origin to these rocks, separating the diverse magmatic provinces of the country.
References
BARTH, "Theoretical Petrology ". 1965.
BURRI, Petrochemical calculations. New York. 1956
H. S. WASHINGTON, "Chemical analyses of igneous rocks" U. S.G.S., pp.99, 1917.
JOHANNSEN, A., "A. descriptive petrography of the igneous-rocks". Vol. 1, pag. 83-99, 1938. The University of Chicago Press. Chicago.
NIGGLI. P., Rocks and Mineral Deposits. San Francisco, W. H. Freeman and Company, 1954.
