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OOLITHE [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2018-03-12

English

Subject field(s)
  • Geology
  • Various Metal Ores
DEF

A spherical or ellipsoidal particle of sand with concentric or radial structure that is formed by the replacement or accretion of concentric layers of lime around a quartz grain.

CONT

... ooides of hematite ... partly recrystallized to magnetite ...

OBS

The concentric layers around the quartz grain may also be of iron or phosphate.

OBS

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

PHR

oolite of iron oxide

PHR

pyrite oolite

French

Domaine(s)
  • Géologie
  • Minerais divers (Mines métalliques)
DEF

[...] petit grain rond de calcaire de la taille des œufs de poissons (0.2 à 2 mm) constitué d'un noyau de matière minérale (quartz, morceau de calcaire) entouré d'enveloppes concentriques fine de calcite.

OBS

Ces termes peuvent également s'appliquer à des grains entourés d'enveloppes ferrugineuses ou phosphatées.

OBS

oolite; oolithe : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

PHR

oolite d'oxyde de fer

PHR

oolite pyriteuse

Spanish

Campo(s) temático(s)
  • Geología
  • Minerales varios (Minas metálicas)
Save record 1

Record 2 2008-07-31

English

Subject field(s)
  • Petrography
DEF

A rock consisting of small round grains that resemble the roe of fish, are cemented, and consist of small concretions which usually are of calcium carbonate forming a variety of limestone but sometimes are of silica or iron oolite.

CONT

Oolitic limestone is a carbonate rock made up mostly of ooliths (or ooids) which are sand-sized carbonate particles that have concentric rings of CaCO3.

French

Domaine(s)
  • Pétrographie
OBS

oolithe : Corps sphérique d'environ 1 mm, fait d'enveloppes minérales concentriques [...] par extension, on appelle «oolithe» le calcaire à oolithes.

Spanish

Save record 2

Record 3 2006-08-19

English

Subject field(s)
  • Petrography
  • Geology
  • Chronology
DEF

European stage: Middle Jurassic (above Toarcian, below Bethonian).

French

Domaine(s)
  • Pétrographie
  • Géologie
  • Chronologie
DEF

Étage du Jurassique moyen (ère secondaire), au-dessus de l'Aalénien.

OBS

Bajocien : Nom donné en 1843, par Alcide d'Orbigny, à l'oolithe inférieur de William Smith.

Spanish

Campo(s) temático(s)
  • Petrografía
  • Geología
  • Cronología
DEF

Piso estratigráfico perteneciente a la era mesozoica, al período jurásico y a la época del dogger; cronológicamente sigue al aalense y precede al batoniense, lo cual permite atribuirle unos 165 millones de años.

OBS

Viene su nombre de Bajocasses, pueblo galo de la región francesa de Bayeux.

OBS

Pese a que la fuente citada escribe los nombres de los períodos geológicos con minúscula, el Diccionario de dudas de la Real Academia Española señala que tales sustantivos deben escribirse con mayúscula.

Save record 3

Record 4 1998-09-03

English

Subject field(s)
  • Petrography
  • Geochemistry
  • Geology
CONT

Phosphatic oolites are enclosed within the layers of phosphorite in most of the nodules. The oolites are composed of concentric layers of collophane with an occasional layer of columnar francolite.

French

Domaine(s)
  • Pétrographie
  • Géochimie
  • Géologie
DEF

[...] grain de phosphate à texture fibroradiée.

Spanish

Save record 4

Record 5 1977-11-18

English

Subject field(s)
  • Geology
OBS

A spherical or roundish pellet or particle (generally less than 1 mm in diameter) in a sedimentary rock, externally resembling an oolith in size or shape but of secondary origin and amorphous or crypto-or micro-crystalline, and lacking the radial or concentric internal structure of an oolith; e.g. a fecal pellet, a worn calcite grain, a shell fragment, or a glauconite granule, or an oolith whose peripheral layers have been resorbed or replaced.

French

Domaine(s)
  • Géologie
OBS

D'une manière générale, il existe trois types de textures ayant une apparence oolithique: 1) les vraies oolithes, formées par agglutination autour d'un noyau; 2) les "fausses oolithes" (gravelles), petits grains roulés en forme d'oolithe; 3) les "perles" (...), formées en concrétions (...)

Spanish

Save record 5

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