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PEGMATITIC HORNBLENDE DIORITE [1 record]

Record 1 2006-11-15

English

Subject field(s)
  • Petrography
CONT

Hornblende diorite is found in Precambrian basement rocks, and is mottled light grey, pale pink, and greenish-black in colour. It consists mainly of substantially altered plagioclase feldspar (60%) and hornblende (40%), with minor amounts of magnetite and small veins of calcite and epidote ... The rock is very coarse- to mainly coarse-grained. Very coarse-grained varieties can be pegmatitic with grains up to 7 cm in length, this type of rock can be called a pegmatitic hornblende diorite.

OBS

pegmatitic hornblende diorite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
CONT

Des dykes relativement épais, comme la diorite de Dufresnoy dans le Camp central, sont subconcordants à la stratigraphie et présentent des bordures métriques hybrides, qui renferment une abondance de xénolites des unités volcaniques adjacentes, passant graduellement à une phase marginale interne de gabbro à diorite à hornblende recoupée par une diorite quartzifère à hornblende pegmatitique et grenue, qui fait place vers l'intérieur du dyke à une phase dioritique grenue et plus leucocrate.

OBS

diorite à hornblende pegmatitique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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