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DACITE [8 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-12-12

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
DEF

Very fine grained to microcrystalline possibly ash undergoing later brecciation.

CONT

Before stepping on the bridge look very carefully at the rocks. This rock is called a breccia (a rock that consists of fragments of one or more older rock types). This rock is made up of lots of light green fragments surrounded by a darker green, fine-grained material (matrix). It has formed as a result of explosive volcanic activity. In this case, the light green fragments consist of a volcanic rock known as dacite (fine-grained quartz and feldspar) so the rock is called a dacite breccia.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Avant de prendre pied sur la passerelle, observer les roches attentivement. Cette roche est appelée brèche (une roche composée de fragments d'un ou de plusieurs types de roche plus anciens). À cet endroit la brèche se compose de nombreux fragments vert pâle entourés d'un matériau à grains fins vert plus foncé (la matrice). Elle doit sa formation à une activité volcanique de natureexplosive. Dans ce cas, les fragments vert pâle sont d'une rochevolcanique appelée dacite (quartz et feldspath à grains fins) etcette roche est ainsi appelée brèche dacitique.

OBS

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

Spanish

Save record 1

Record 2 2011-12-12

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
DEF

A rock formed of fine, dacitic volcanic detritus such as dust, ashes, sand, or fine fragments resulting from explosive volcanic eruptions by which lava is blown into fine fragments.

CONT

The major exposed rocks in the Dadi Property are Upper Jurassic Baiyinggaolao Formation dacitic tufaceous lava, dacitic tuff, rhyolitic tuff, and tufaceous sandstone and conglomerate, among which dacitic tufaceous lava and dacitic tuff are the main host rocks of mineralization.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
OBS

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

Spanish

Save record 2

Record 3 2011-12-12

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
CONT

Mt. Scott is the largest surviving satellite cone. As the glaciers were retreating magma began to rise deep within the volcano. A series of violent explosive eruptions of dacite pumice were thrown from vents.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Les fractures de direction NW-SE [nord-ouest-sud-est] et violemment rouvertes, émettent au commencement d'abondants matériaux pyroclastiques de ponce dacitique qui atteignent l'épaisseur maximum après l'éclat de grandes caldères d'explosion.

OBS

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

Spanish

Save record 3

Record 4 2011-07-28

English

Subject field(s)
  • Petrography
DEF

A fine-grained extrusive rock resembling andesite but having a more sodic plagioclase and more quartz.

OBS

dacite: From the province of Dacia, Romania.

French

Domaine(s)
  • Pétrographie
DEF

Lave ayant la composition d'une diorite quartzifère à phénocristaux de quartz, de plagioclases zonés, de hornblende et biotite souvent altérés.

CONT

[...] les dacites [...] correspondants microlitiques de l'estérellite [...] sont des roches gris-clair dans lesquelles on distingue des phénocristaux de quartz automorphe, d'andésine, de biotite et de hornblende ou de pyroxène.

Spanish

Campo(s) temático(s)
  • Petrografía
DEF

Roca eruptiva gris o azulada, de composición semejante a la de la diorita cuarcífera (plagioclasa, cuarzo, mica negra, anfíboles). Presenta fenocristales inclusos en una pasta o masa vítrea.

Save record 4

Record 5 2010-03-02

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
CONT

Dacite magma, by slow cooling, becomes granitic plutons which are the major constituent of continental crust and matured island arc crust.

CONT

Mount St. Helens provides a good example of how a volcanic eruption can start and how the style of eruption can vary over time - even though the magma remains chemically similar. ... Steam explosions, some with small amounts of ash, continued intermittently until the catastrophic eruption began at 08:32 ... on 18 May 1980. The gas-rich dacitic magma, instantaneously released by the world's largest observed landslide, exploded in a blast that extended laterally for 32 km and vertically to a height of 25 km.

OBS

dacite magma; dacitic magma: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Le Mont Saint Helens est un bon exemple de la manière dont une éruption volcanique peut commencer et dont le style d'éruption peut varier avec le temps - même si le magma reste chimiquement semblable. [...] Des explosions de vapeur, certaines contenant de la cendre, se sont poursuivies par intermittence jusqu'à ce que l'éruption catastrophique débute à 08h32 [...] le 18 mai 1980. Le magma dacitique riche en gaz, qui a été libéré instantanément par le plus grand glissement de terrain jamais observé, a explosé avec une force telle que la déflagration s'est étendue latéralement sur une longueur de 32 km et verticalement sur une hauteur de 25 km.

OBS

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

Spanish

Save record 5

Record 6 2005-10-03

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 6

Record 7 2005-10-03

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 7

Record 8 2004-11-10

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 8

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