Nephelinite - Wikipedia
WEBNephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite). If olivine is present, the rock may be classified as an olivine nephelinite. Nephelinite is dark in color and may resemble basalt in …
Nephelinite | volcanic, igneous, basaltic | Britannica
WEBnephelinite, silica-poor (mafic) lava that contains nepheline and pyroxene and is usually completely crystallized. Despite its wide geographic distribution and occasional extensive local development, it is a very rare rock.
Nephelinite - an overview | ScienceDirect Topics
WEBNephelinite is a type of porphyritic rock containing olivine, Ti-augite, and sometimes biotite-phlogopite and analcite phenocrysts in a microcrystalline groundmass of augite microlites, with minor magnetite and nepheline, indicating a magmatic flow.
Nephelinite: Mineral information, data and localities. - mindat.org
WEBAbout Nephelinite Hide. A foidite (fine-grained or aphanitic igneous rock) made up almost entirely of nepheline and augite. If olivine is present, the rock may be classified as an olivine nephelinite). It contains little or no feldspars.
Nephelinite - SpringerLink
WEBA nephelinite is a hypabyssal or extrusive strongly undersaturated igneous rock composed essentially of nepheline and pyroxene.
WEBWe investigated a detailed petrological, mineralogical and geochemical study of nephelinite lavas from Hanang volcano to constrain the pre-eruptive conditions of silica-undersaturated liquid and their magmatic evolution during ascent to the surface.
Nephelinites in eastern China originating from the mantle …
WEBAug 20, 2021 · Nephelinites, a highly alkaline volcanic rock type, have widely been thought to be formed in a shallow lithosphere previously impregnated with phlogopite and/or amphibole. Here we argue that nephelinites start melting at much greater depths than previously thought.
Petrogenesis of nephelinites from the Tarim Large ... - ScienceDirect
WEBApr 1, 2015 · The nephelinite exposed in the Wajilitage area in the northwestern margin of the Tarim large igneous province (TLIP), Xinjiang, NW China display porphyritic textures with clinopyroxene, nepheline and olivine as the major phenocryst phases, together with minor apatite, sodalite and alkali feldspar.
Nephelinite - Natural Atlas
WEBNephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite). If olivine is present, the rock may be classified as an olivine nephelinite. Nephelinite is dark in color and may resemble basalt in …
Nephelinite lavas at early stage of rift initiation (Hanang volcano ...
WEBJun 23, 2016 · Hanang volcano is the southernmost volcano in the North Tanzanian Divergence and the earliest stage of rift initiation. Hanang volcano erupted silica-undersaturated alkaline lavas with zoned clinopyroxene, nepheline, andradite-schorlomite, titanite, apatite, and pyrrhotite.