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GNEISS FORMATION [3 records]

Record 1 2006-11-15

English

Subject field(s)
  • Petrography
CONT

A diverse Precambrian sequence of garnet-rich gneiss and schist with lenses of marble, quartzite, iron formation, amphibolite, orthoamphibolite, serpentinite, quartzite, garnet amphibolite, and aluminous schist occurs in the thin and discontinuous X(A) g map unit(O’Neill et al, 1996) in the southern Highland Mountains of southwestern Montana.

CONT

Metamorphosed basalts create ortho-amphibolites and other chemically appropriate lithologies create para-amphibolites.

OBS

The names ortho-amphibolite, para-amphibolite and meta-amphibolite may be found occasionally in the literature. The prefix ... ortho- was used for the following rocks: metamorphic rocks of igneous origin, rocks containing K-feldspar, SiO2-saturated rocks, sediments with defined contents of matrix, contents of carbon in coals, type of cumulates, etc. The use of the prefixes ortho- and para- is accepted by SCMR in the classical concept of Rosenbusch for metamorphic rocks derived from igneous and sedimentary parents respectively, but difficulties may exist in determining the nature of the protolith by directly observable features.

OBS

orthoamphibolite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
CONT

Les amphibolites sont pour la plupart des métabasites (ortho-amphibolites), certaines peuvent provenir de sédiments calcaires métamorphisés (ce sont alors des para-amphibolites).

OBS

ortho-amphibolite : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 1

Record 2 1999-12-29

English

Subject field(s)
  • Geological and Other Scientific Names
OBS

A same designation could refer to a geographic or a geologic entity, sometimes with a slight variant in spelling or writing. It is important to distinguish one from the other and write each correctly according to the given context.

OBS

The Oblique Creek Formation consist of thick sequences of quartz-albite-mica gneiss, albite-actinolite schist, meta-chert, conglomerate, greenstone, and meta-tuff in Jennings and Wolf Lake areas.

French

Domaine(s)
  • Noms géologiques ou scientifiques
OBS

La règle concernant la majuscule au générique d'un nom géologique demeure imprécise. Habituellement, les noms de divisions stratigraphiques portent la majuscule et les entités de moindre importance n'en portent pas.

OBS

Une même désignation peut se référer à une entité géographique et à une entité géologique, parfois avec une légère variante. Il importe de bien distinguer l'une de l'autre et d'utiliser la graphie correcte selon le contexte.

OBS

La formation d'Oblique Creek est constituée d'épaisses successions de gneiss à quartz, albite et mica, de schiste à albite et actinolite, de métachert, de conglomérat, de roche verte et de métatuf dans les régions de Jennings et de Wolf Lake.

Spanish

Save record 2

Record 3 1991-04-11

English

Subject field(s)
  • Geology
DEF

Sandstone containing migmatite, a. c. injection gneiss, which is a gneiss produced by the injection of igneous material between the laminae of a schistose formation.

French

Domaine(s)
  • Géologie
DEF

Grès contenant de la migmatie qui est une roche métamorphique dont l'aspect rappelle celui du gneiss.

Spanish

Save record 3

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