Greenschist — also known as greenstone is a general field petrologic term applied to metamorphic and/or altered mafic volcanic rock. The green is due to abundant green chlorite, actinolite and epidote minerals that dominate the rock. However, basalts may… … Wikipedia
facies — /fay shee eez , sheez/, n., pl. facies. 1. general appearance, as of an animal or vegetable group. 2. Geol. the appearance and characteristics of a sedimentary deposit, esp. as they reflect the conditions and environment of deposition and serve… … Universalium
FACIÈS MINÉRALOGIQUE D’ESKOLA — «Un faciès minéralogique est l’ensemble des roches formées en conditions de pression et de température si semblables qu’une même composition chimique fournisse le même ensemble de minéraux (paragenèse minéralogique) quel que soit le mode de… … Encyclopédie Universelle
Metamorphic facies — Eclogite Blueschist Greenschist Prehnite Pumpellyite … Wikipedia
epidote-amphibolite facies — One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under moderate temperature (500–750°F, or 250–400°C) and pressure conditions. This facies grades into the greenschist facies… … Universalium
zeolite facies — ▪ geology one of the major divisions of the mineral facies classification of metamorphic rocks, the rocks of which formed at the lowest temperatures and pressures associated with regional metamorphism. It represents the transition between… … Universalium
Prehnite-pumpellyite facies — The prehnite pumpellyite facies is a metamorphic facies typical of subseafloor alteration of the oceanic crust around mid ocean ridge spreading centres. It is a metamorphic grade transitional between zeolite facies and greenschist facies… … Wikipedia
metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… … Universalium
Massif Central (geology) — The Massif Central forms together with the Armorican Massif (Brittany and Normandy) one of the two big basement massifs in France. Its geological evolution started in the late Neoproterozoic and continues to this day. It has been shaped mainly by … Wikipedia
Pilbara craton — The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6 2.7 Ga crust on Earth. Similarities of their… … Wikipedia
