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 grades into absarokite with an increase in olivine and into banakite with more sanidine. Shoshonite is found in field S2 in the TAS diagram. Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ... Please feel free to link to this page.

Jan 15, 1980 · Shoshonitic rocks on continental margins are younger, stratigraphically higher and more distant from the oceanic trench than the high-K calc-alkaline or calc-alkaline suites, but there is a complete gradation between the suites. A similar zonation occurs in some island arcs.

Feb 27, 2014 · We describe a shoshonite suite of ultramafic through basaltic to granitic rocks in eastern Tibet that follow the Red River fault zone and its northern extension, the Batang-Lijiang fault system, a total strike length of over 1,500 km.

The island arc alkali series volcanic rock is represented by the shoshonite association, which is a representative rock association of mature island arcs.

Oct 1, 2015 · These deep geological and tectonic events in turn produced the shoshonite volcanic rocks in the Luzong Basin. 1. Introduction. The rock name ‘shoshonite’ was proposed by Iddings (1895) for orthoclase-bearing basalts from Yellowstone Park, USA.

Shoshonite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

A trachyandesite composed of olivine and augite phenocrysts in a groundmass of labradorite with alkali feldspar rims, olivine, augite, a small amount of leucite, and some dark-colored glass. Its name is derived from the Shoshone River, Wyoming and given by Iddings in 1895.

Jul 1, 2009 · Fijian shoshonitic suites display a range of enrichment in large ion lithophile elements, Th, U, and P relative to rare earth elements and high field strength elements (HFSE), reflecting variable contributions by the subarc mantle source and subduction-related components.

A trachyandesite composed of olivine and augite phenocrysts in a groundmass of labradorite with alkali feldspar rims, olivine, augite, a small amount of leucite, and some dark-colored glass. Shoshonite grades into absarokite with an increase in …