granitic magma
91Manto ore deposits — Manto orebodies are stratabound irregular to rod shaped ore occurrences usually horizontal or near horizontal in attitude. Manto deposits are an important source of copper, forming one of the world major copper resources in Chile and southern… …
92Jakob Sederholm — Infobox Scientist name = PAGENAME box width = image width = caption = PAGENAME birth date = 1863 birth place = death date = 1934 death place = residence = citizenship = nationality = Finnish ethnicity = field = petrologist work institutions =… …
93Milbanke Sound Group — Milbanke Sound Cones Mountain …
94Orbicular Granite — is an uncommon rock type found near Mount Magnet, in Western Australia. It is a granitic rock with orbicules concentrically layered, spheroidal structures, probably formed through nucleation around a grain in a cooling magma chamber …
95greisen — /gruy zeuhn/, n. a hydrothermally altered rock of granitic texture composed chiefly of quartz and mica, common in the tin mines of Europe. [1875 80; < G] * * * ▪ rock modification of granite, an intrusive igneous rock; it consists… …
96pluton — /plooh ton/, n. Geol. any body of igneous rock that solidified far below the earth s surface. [1935 40; < G Pluton, back formation from plutonisch PLUTONIC] * * * ▪ igneous rock body of intrusive igneous rock the size, composition, shape,… …
97South America — South American. a continent in the S part of the Western Hemisphere. 271,000,000; ab. 6,900,000 sq. mi. (17,871,000 sq. km). * * * Continent, Western Hemisphere. The world s fourth largest continent, it is bounded by the Caribbean Sea to the… …
98Andes Mountains — Mountain system, western South America. One of the great natural features of the globe, the Andes extend north south about 5,500 mi (8,850 km). They run parallel to the Caribbean Sea coast in Venezuela before turning southwest and entering… …
99skarn — In geology, a metamorphic zone developed in the contact area around igneous rock intrusions when carbonate sedimentary rocks are invaded by and replaced with chemical elements that originate from the igneous rock mass nearby. Many skarns also… …
100Western Africa — ▪ region, Africa Introduction region lying south of the Sahara and east and north of the Atlantic Ocean. It is latitudinally divided into two parallel belts of land: the western portion of the Sudan, a geographic area that stretches across… …
