Basanite


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basanite

[′bas·ə‚nīt]
(petrology)
A basaltic extrusive rock closely allied to chert, jasper, or flint. Also known as Lydian stone; lydite.

Basanite

 

magmatic rock of porphyritic structure. In addition to plagioclase, olivine, and augite, it is composed of up to 15 percent leucite, nepheline, or analcime. Depending on the content of these three, basanite is classified as leucitic, nephelinic, or analcimic. Basanite is used for stone casting and as a facing material.

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Green, "The mineralogy, geochemistry and origin of lherzolite inclusions in Victorian basanite," Geochimica et Cosmochimica Acta, vol.
Bowie glass and whole-rock analyses span a wide range of compositions, from basanite to near-trachyte, and cover the entire compositional range for the Pratt--Welker and other Gulf of Alaska seamount chains (Fig.
Glass in the Baarley xenoliths has three different origins: infiltration of an early host melt different in composition from the erupted host basanite; partial melting of amphibole; reaction of either of these melts with xenolith minerals.
Based on the chemical analysis, they are classified into dominant alkali olivine basalts and basanites with minor olivine tholeiites.
4c and d).The volcanics in Bhm where least altered are petrographically basanite and alkali- basalt contain phenocrysts of olivine and augite with a groundmass consisting of plagioclase, pargasite, phlogopite and opaque and glassy material.
Other famous mineralogical locality of zeolites (natrolite, analcime, phillipsite, mesolite, thomsonite) together with apophyllite, calcite and chlorite was described by Bouska and Malec (1971) in amygdales of a basanite intrusion near Soutesky.
Predominance of sulphates (mikasaite, basanite and anhydrite) over pyrite was identified by X-ray powder diffraction, and pyrite was identified only in samples 2 and 4 (Table 3, Fig.
The volcanics are mainly basanites and tephrites, mildly to strongly alkaline, and akin to the intra-plate volcanic rock series.
K-Ar palaeomagnetic data from Neogene basanites near Ladek Zdroj, Sudetes Mts., Annales Societatis Geologorum Poloniae, 72, 119-129.
Teschenites and basanites from Guayacan Formation, are relative high in [P.sub.2][O.sub.5], Ti[O.sub.2], Cr, La and Ni than basanites and alkaline basalts from La Garita Formation in the paleo-arc, with relative high [Al.sub.2][O.sub.3] and Ba.