VII.—A Method of Classifying Igneous Rocks according to their Chemical Composition

Hugh Warth

doi:10.1017/s0016756800117832

VII.—A Method of Classifying Igneous Rocks according to their Chemical Composition

Geological Magazine ◽

10.1017/s0016756800117832 ◽

1906 ◽

Vol 3 (3) ◽

pp. 131-135

Author(s):

Hugh Warth

Keyword(s):

Chemical Composition ◽

Igneous Rocks ◽

Standard Rock ◽

Great Work ◽

Chemical Classification ◽

Close Proximity

The chemical classification of igneous rocks is rendered difficult by the large number of substances which are present in them. H. S. Washington, who based his system of classification upon the composition of standard rock-forming minerals, found it necessary in his great work to divide his 2,880 rocks into no less than 167 final groups in order to ensure a close proximity between the rocks within each group.

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Chemical classification of igneous rocks and igneous rock associations by means of discriminant analysis and cluster analysis

TMPM Tschermaks Mineralogische und Petrographische Mitteilungen ◽

10.1007/bf01085991 ◽

1972 ◽

Vol 17 (3) ◽

pp. 161-188

Author(s):

W. H. Bernotat

Keyword(s):

Cluster Analysis ◽

Discriminant Analysis ◽

Igneous Rock ◽

Igneous Rocks ◽

Chemical Classification ◽

And Cluster Analysis

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A proposal by the IUGS Subcommission on the Systematics of Igneous Rocks for a chemical classification of volcanic rocks based on the total alkali silica (TAS) diagram

Australian Journal of Earth Sciences ◽

10.1080/08120098408729295 ◽

1984 ◽

Vol 31 (2) ◽

pp. 243-255 ◽

Cited By ~ 138

Author(s):

R. W. Le Maitre

Keyword(s):

Volcanic Rocks ◽

Igneous Rocks ◽

Chemical Classification ◽

Total Alkali

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VII.—Classification of Igneous Rocks according to their Chemical Composition.

Proceedings of the Royal Society of Edinburgh ◽

10.1017/s0370164600011585 ◽

1908 ◽

Vol 28 ◽

pp. 85-160

Author(s):

H. Warth

Keyword(s):

Chemical Composition ◽

Igneous Rocks ◽

The Individual ◽

Geological Magazine

In my previous paper (see Geological Magazine, March 1906, p. 131) I explained a method of separating igneous rocks into sixteen groups of chemically similar individual rocks. A more minute subdivision appears, however, desirable for the special purpose of identifying and describing particular rocks. I have therefore devised the following further classification with four times as many groups, and I trust that the proximity thus attained between the individual rocks of each group will amply meet all requirements.

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