By R. W. Le Maitre, A. Streckeisen, B. Zanettin, M. J. Le Bas, B. Bonin, P. Bateman
A long time of box and microscope stories, and more moderen quantitative geochemical analyses have led to an unlimited, and infrequently overwhelming, array of nomenclature and terminology linked to igneous rocks. This publication offers an entire class of igneous rocks in keeping with all of the techniques of the foreign Union of Geological Sciences (IUGS) Subcommission at the Systematics of Igneous Rocks. The word list of igneous phrases has been absolutely up to date because the first version and now comprises 1637 entries, of which 316 are steered through the Subcommission. Incorporating a finished bibliography of resource references for all of the phrases incorporated within the thesaurus, this ebook is an imperative reference consultant for all geologists learning igneous rocks, both within the box or the laboratory. It provides a standardised and extensively authorized naming scheme that would enable geologists to interpret terminology within the fundamental literature and supply formal names for rock samples in response to petrographic analyses. it's also supported by way of an internet site with downloadable code for chemical classifications.
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Extra resources for Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks
41–43. W. , 1983. Kimberlites near Orroroo, South Australia. In: Kornprobst, J. (Editor) Proceedings of the Third International Kimberlite Conference. Elsevier. 121–142. , 1989. Contrasting Group1 and Group-2 kimberlite petrology: towards a genetic model for kimberlites. Proceedings of the Fourth International Kimberlite Conference, Perth, Australia. Geological Society of Australia. 528–544. R. , 1985. Geochemical character of southern African kimberlites: a new approach based upon isotopic constraints.
Field 15 (foidite sensu lato) — the general root name of this field is foidite, but as these rocks occur relatively frequently the field has been subdivided into three: fields 15a , 15b and 15c as shown in Fig. 12. Field 15a (phonolitic foidite) — wherever possible replace the term foidite with a more specific term, such as phonolitic nephelinite. Alternatively, the term alkali feldspar foidite could be used as the root name, which would give specific terms such as sanidine nephelinite. Field 15b (tephritic foidite, basanitic foidite) — these two root names are separated according to their olivine content, as in field 14.
If garnet or spinel is greater than 5% use garnet peridotite, chromite dunite etc. 3 PROVISIONAL “FIELD” CLASSIFICATION The “field” classification of plutonic rocks should be used only as a provisional measure when an accurate mineral mode is not yet available. When available, the plutonic QAPF diagram should be used. The classification is based on a simplified version of the plutonic QAPF diagram (Streckeisen, 1976) and is shown in Fig. 10. e. use syenitic rock in place of syenitoid. Q 60 60 granitoid 65 20 A syenitoid 20 dioritoid gabbroid anorthosite 10 P 10 foid dioritoid foid syenitoid foid gabbroid 60 60 foidolite F Fig.