vitric


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Related to vitric: vitric tuff

vitric

[′vi·trik]
(geology)
Referring to a pyroclastic material which is characteristically glassy, that is, contains more than 75% glass.
References in periodicals archive ?
Furthermore, since research tends to focus on allophanic Andisols, relatively few references exist for this parameter in non-allophanic or vitric Andisols.
A vitric ash bed on the east bank of West Amarillo Creek, Potter County, of the Texas Panhandle occupies a portion of a paleovalley in the Ogallala Formation of late Tertiary age.
Pseudo-morphs after feldspathoid and vitric shards in marginal parts of vesicles are partly or totally dissolved, forming secondary voids, or filled with analcime with mosaic texture.
Soils have been classified as well-drained, coarse-textured, vitric Andosols mixed with volcanic ash (FAO/UNESCO 1975).
The pyroclastics are dacitic in composition and include air fall crystal tuffs, ignimbrite and vitric tuff.
Soils are classified as well drained, coarse-textured, vitric Andosols mixed with volcanic ash (Anonymous 1975).
Accessory lithics are crystalline vitric and vitric-crystal ash flow pyroclastic rocks, possibly detached from unit I.
The soil was Opotiki sandy loam, a Vitric Orthic Allophanic soil (Hewitt 1993).
The tuffs have a red hematite-rich matrix and contain abundant small euhedral feldspar crystals and small (<1 mm to 3 cm), flattened, angular felsic volcanic clasts and vitric shards.
Later, bubble nucleation, rapid gas release and expansion processes created foam in the magma until it spread out forming a small vitric flow lobe over the north-eastern edifice flank (possible boiling over process, Figure 16 e).
The volcanic soil used in Part I, Opotiki sandy loam, a Vitric Orthic Allophanic soil (Hewitt 1993), was used in all experiments, except A and B.