lamprophyre

lam·pro·phyre

L0031600 (lăm′prə-fīr′)n. A dark igneous rock, having porphyritic texture, in which both the phenocrysts and the matrix consist of hornblende, pyroxene, and biotite.

[German Lamprophyr : Greek lampros, clear (from lampein, to shine) + French porphyre, porphyry (from Old French porfire; see porphyry).]

lamprophyre

(ˈlæmprəˌfaɪə) n (Geological Science) any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions[C19: from Greek lampros bright + -phyre, from porphyry]

Lamprophyre

lamprophyre

[′lam·prə‚fī·ər] (petrology) Any of a group of igneous rocks characterized by a porphyritic texture in which abundant, large crystals of dark-colored minerals appear set in a not visibly crystalline matrix.

Lamprophyre

melanocratic igneous dike rock that differs from the corresponding igneous rocks to which it is genetically related by its sharply increased content of dark minerals (usually at least 30 percent of the rock). The color of lamprophyre varies from dark gray to black. Its constituents include feldspar (sometimes feldspathoid) and dark minerals (biotite, amphibole, pyroxene, and sometimes olivine). In the porphyritic varieties of lamprophyre the phenocrysts are usually represented by dark minerals—this is called lamprophyric texture. There are calcalkalic lamprophyres (spessartite, kersantite) and alkalic lamprophyres (camptonite, alnöite). Lamprophyres sometimes grade into porphyrites.

单词	lamprophyre
释义	lamprophyre lam·pro·phyre L0031600 (lăm′prə-fīr′)n. A dark igneous rock, having porphyritic texture, in which both the phenocrysts and the matrix consist of hornblende, pyroxene, and biotite. [German Lamprophyr : Greek lampros, clear (from lampein, to shine) + French porphyre, porphyry (from Old French porfire; see porphyry).] lamprophyre (ˈlæmprəˌfaɪə) n (Geological Science) any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions[C19: from Greek lampros bright + -phyre, from porphyry] Lamprophyre lamprophyre [′lam·prə‚fī·ər] (petrology) Any of a group of igneous rocks characterized by a porphyritic texture in which abundant, large crystals of dark-colored minerals appear set in a not visibly crystalline matrix. Lamprophyre melanocratic igneous dike rock that differs from the corresponding igneous rocks to which it is genetically related by its sharply increased content of dark minerals (usually at least 30 percent of the rock). The color of lamprophyre varies from dark gray to black. Its constituents include feldspar (sometimes feldspathoid) and dark minerals (biotite, amphibole, pyroxene, and sometimes olivine). In the porphyritic varieties of lamprophyre the phenocrysts are usually represented by dark minerals—this is called lamprophyric texture. There are calcalkalic lamprophyres (spessartite, kersantite) and alkalic lamprophyres (camptonite, alnöite). Lamprophyres sometimes grade into porphyrites.
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