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GABBRO FELDSPATHOIDES [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-07-04

English

Subject field(s)
  • Petrography
DEF

An alkali gabbro primarily composed of plagioclase, hornblende, biotite, and titanaugite, with lesser amounts of alkali feldspar and nepheline.

OBS

Its name is derived from Essex County, Massachusetts, from where it was originally defined by Sears in 1891 ...

French

Domaine(s)
  • Pétrographie
DEF

[Gabbro à feldspathoïdes] type grenu, où le plagioclase a une basicité inférieure à 50% d’anorthite.

Spanish

Campo(s) temático(s)
  • Petrografía
DEF

Variedad de teralita cuya plagioclasa es poco básica.

Save record 1

Record 2 1999-09-16

English

Subject field(s)
  • Mineralogy
  • Petrography
CONT

Alkalic gabbros are a rather rare group of rocks. They occur in complex hypabyssal associations such as differentiated sills or volcanic complexes and grade into alkalic diorites and monzonite on the one hand, ultramafic rocks on the other hand.

CONT

Hypabyssal and plutonic rocks of the Alkali Gabbro Clan are particularly variable in coarseness, texture, and mineral content.

French

Domaine(s)
  • Minéralogie
  • Pétrographie
CONT

Gabbros alcalins. Ce sont des roches intrusives basiques, caractérisées par une teneur élevée en feldspath potassique (orthose) et par la présence ou non de feldspathoïdes. Parmi ces roches, il faut signaler: les «essexites», les «théralites» et les «shonkinites»; en fait, ce sont des curiosités pétrographiques.

CONT

Le gabbro alcalin qui contient plus de 5% de feldspathoïdes est appelé théralite.

Spanish

Save record 2

Record 3 1978-04-19

English

Subject field(s)
  • Geology
OBS

Relatively dark rocks characterized by the coexistence of plagioclase (andesine or labradorite), large amounts of nepheline, and a ferromagnesian mineral (augite or litanaugite, olivine, barkevikitic hornblende).

OBS

"Essexites and Theralites" (...), like the malignites, also are feldspathoidal gabbros of widely varied composition and texture.

French

Domaine(s)
  • Géologie
OBS

Roches assez sombres, caractérisées par la coexistence d’un plagioclase (andésine ou labrador), de la néphéline en grande quantité, d’un élément ferromagnésien (augite ou augite titanifère, souvent olivine, hornblende barkévicitique).

OBS

"Roches non saturées en silice et à feldspathoïdes" (...) "Gabbros feldspathoïdiques" (...)

Spanish

Save record 3

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