@prefix qx8: . @prefix skos: . qx8: a skos:ConceptScheme . qx8:-7153RZBJ-H skos:prefLabel "volcanic rock"@en, "roche volcanique"@fr ; a skos:Concept ; skos:narrower qx8:-09JZJ0XJ-X . qx8:-09JZJ0XJ-X skos:definition "Le basalte est une roche magmatique volcanique basique issue d'un magma refroidi rapidement et caractérisée par sa composition minéralogique : plagioclases (50 %), pyroxènes (25 à 40 %), olivine (10 à 25 %), et magnétite (2 à 3 %). Sur Terre, il a une origine volcanique et est un des constituants principaux de la croûte océanique. Le basalte est une roche mélanocrate à holomélanocrate (sombre à très sombre), à structure microlitique. Il est issu de la fusion partielle du manteau terrestre, de composition péridotitique (lherzolite). Les roches plutoniques de même composition minéralogique sont les gabbros. (Adapté de : https://fr.wikipedia.org/wiki/Basalte)"@fr, "Basalt is an aphanitic extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to conditions deep in Earth's interior. (Adapted from: https://en.wikipedia.org/wiki/Basalt)"@en ; skos:exactMatch , , ; skos:prefLabel "basalt"@en, "basalte"@fr ; a skos:Concept ; skos:broader qx8:-7153RZBJ-H ; skos:inScheme qx8: .