Back Şoşonit Azerbaijani Šošoniit Estonian Shoshonite French Shoshonite Italian Shoshonito Portuguese 橄榄玄粗岩 Chinese
_13.jpg)
Shoshonite is a type of igneous rock. More specifically, it is a potassium-rich variety of basaltic trachyandesite,[1] composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass. Shoshonite gives its name to the shoshonite series and grades into absarokite with the loss of plagioclase phenocrysts and into banakite with an increase in sanidine.[2] Shoshonite was named by Iddings in 1895 for the Shoshone River in Wyoming.[3] Textural and mineralogical features of potash-rich rocks of the absarokite-shoshonite-banakite series strongly suggest that most of the large crystals and aggregates are not true phenocrysts as previously thought but are xenocrysts and microxenoliths, suggesting a hybrid origin involving assimilation of gabbro by high-temperature syenitic magma.[4]
- ^ Le Maitre, R.W. (editor) (2002). Igneous Rocks — A Classification and Glossary of Terms (2nd ed.). Cambridge: Cambridge University Press. p. 141. ISBN 0-521-66215-X.
{{cite book}}:|author=has generic name (help) - ^ Gest, D. E. and A. R. McBirney, Genetic relations of shoshonitic and absarokitic magmas, Absaroka Mountains, Wyoming, Journal of Volcanology and Geothermal Research, Vol 6; issues 1-2, Sept 1979. pp 85-104
- ^ Shoshonite: Webster's Online Dictionary Archived 2009-11-27 at the Wayback Machine
- ^ Prostka, Harold J., Hybrid Origin of the Absarokite-Shoshonite-Banakite Series, Absaroka Volcanic Field, Wyoming, 1973 GSA Bulletin February, 1973 v. 84 no. 2 p. 697-702 abstract