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- Title
ORIGIN OF THE AMERICAN QUANTITATIVE IGNEOUS ROCK CLASSIFICATION: PART 3.
- Authors
YOUNG, DAVIS A.
- Abstract
The article presents part three in a series of articles on the history of the quantitative classification of igneous rocks. It examines petrographers C. Whitman Cross, Joseph P. Iddings, Henry S. Washington, and Louis V. Pirsson and the creation of the CIPW (Cross, Iddings, Pirsson, Washington) American classification system. The author discusses the role of chemical and mineral composition and structure in the classification system, reflecting on the importance of Quartz (Q), spinel (S), corundum (C), ferromagnesian minerals (M), alkalo-ferromagnesian minerals (A), and feldspathic minerals (F). The article also examines the later shift to a two factor scheme. Other topics include divisions and subdivisions, issues surrounding nomenclature, and communications between group members.
- Subjects
IGNEOUS rocks; IDENTIFICATION of rocks; PETROLOGY; CROSS, C. Whitman; IDDINGS, Joseph P.; WASHINGTON, Henry S.; PIRSSON, Louis V.; HISTORY of geology
- Publication
Earth Sciences History, 2010, Vol 29, Issue 2, p264
- ISSN
0736-623X
- Publication type
Article
- DOI
10.17704/eshi.29.2.j578210v56517370