basanite


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basanite

(ˈbæsəˌnaɪt)
n
(Geological Science) a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone
[C18: see basalt]
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Lavas recovered from Bowie seamount range from alkalic basalt and basanite through hawaiite, mugearite and benmoreite (Engel et al.
During this period volcanic activities continued locally, represented by analcite bearing basanite and andesites.
In the Montreal area such rocks are mostly alkaline syenite, monzonite, basanite or alkali olivine basalt, and lamprophyre, especially camptonite (Hodgson, 1968; Eby, 1985).
This glass is compositionally similar to groundmass glass in the host basanite.
Thermoclasty does not appear to explain spheroidal weathering in concentric layers (exfoliation or onionskin weathering), common in rocks such as basanite.
Lava flows from San Martin Tuxtla are classified as basanite and alkali basalt.
Carrier rocks are postulated to be nephelinite, basanite and leucitite.
3b) and massive basanite, alkali-basalt, and trachy-basalt and also occur as hyaloclastite and reworked volcanic breccias (Fig.
Three reference suites from Iceland, Moorea and Tristan da Cunha illustrate (respectively) the tholeiitic series containing basalt to rhyolite, the alkaline series with alkali basalts to trachytes and a strongly alkaline series, beginning with basanite and ultimately yielding phonolite; few oceanic islands contain tholeiiteseries rocks.
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.