hypocrystalline


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hypocrystalline

[¦hī·pō′krist·əl·ən]
(petrology)
Pertaining to the texture of igneous rock characterized by crystalline components in an amorphous groundmass. Also known as hemicrystalline; hypohyaline; merocrystalline; miocrystalline; semicrystalline.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The hypocrystalline groundmass contains clinopyroxene (39-46 vol%, Mg# ~0.75), olivine (3-6vol%, [Fo.sub.74-76] mole%), titanomagnetite (4-7vol%, up to 43% ulv.
Magmatism in the Asuncion-Sapucai-Villarrica Graben (Eastern Paraguay) revisited: petrological, geophysical, geochemical, and geodynamic inferences
Those are hypocrystalline alkaline trachytes and rhyolites (Pardo, 2004), that suggest that volatile release was continuous through the permeable conduit walls while magma rising occurred.
The Paipa volcano, Eastern Cordillera of Colombia, South America: volcanic stratigraphy
The basalts from Bbc are hypocrystalline, subporphyritic and sub-intersertal in texture.
Geochemistry and petrogenesis of the volcanic rocks from Bagh complex, northern Balochistan, Pakistan
The main textures exhibited by the andesites are hypocrystalline and porphyritic.
Petrogenesis of Plio-Pleistocene volcanic rocks from the Chagai arc, Balochistan, Pakistan

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