gabbroid - определение. Что такое gabbroid
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Что (кто) такое gabbroid - определение

MAFIC INTRUSIVE IGNEOUS ROCK
Gabbros; Gabro; Gabbroic; Gabbroid
  • Gabbro specimen
  • [[Photomicrograph]] of a [[thin section]] of gabbro
  • QAPF diagram with the gabbro field highlighted in yellow. Gabbro is distinguished from diorite by an anorthosite content of greater than 50% of its plagioclase and from anorthite by a mafic mineral content greater than 10%.
  • QAPF diagram with the gabbroid/dioritoid fields highlighted in yellow. Gabbroids are distinguished from dioritoids by an anorthosite content of greater than 50% of their plagioclase.
  • A gabbro landscape – the main ridge of the [[Cuillin]], [[Isle of Skye]], [[Scotland]]
  • Mineral assemblage of igneous rocks
  • [[Zuma Rock]], Nigeria, a massive, nearly uniform, intrusion of gabbro and [[granodiorite]].
  • Cizlakite sample

gabbro         
['gabr??]
¦ noun (plural gabbros) Geology a dark, coarse-grained plutonic rock consisting mainly of pyroxene, plagioclase feldspar, and often olivine.
Derivatives
gabbroic adjective
gabbroid adjective
Origin
C19: from Ital., from L. glaber, glabr- 'smooth'.
Gabbro         
·noun A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro).
Gabbro         
Gabbro () is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt.

Википедия

Gabbro

Gabbro () is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt. Much of the Earth's oceanic crust is made of gabbro, formed at mid-ocean ridges. Gabbro is also found as plutons associated with continental volcanism. Due to its variant nature, the term gabbro may be applied loosely to a wide range of intrusive rocks, many of which are merely "gabbroic". By rough analogy, gabbro is to basalt as granite is to rhyolite.