- GLOSSARY OF VOLCANIC TERMS
Minerals or rocks that have undergone hydrothermal alteration.
Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
Look at other dictionaries:
Geothermal areas in Lassen Volcanic National Park — ImageStackRight|200 Several groups of hot springs and fumaroles, remnants of former volcanic activity, exist in Lassen Volcanic National Park. Most of these lie in or are closely adjacent to Mount Tehama s caldera. Bumpass Hell is the most… … Wikipedia
Amphibolite — (pronEng|æmˈfɪbəlaɪt) is the name given to a rock consisting mainly of hornblende amphibole, the use of the term being restricted, however, to metamorphic rocks. The modern terminology for a holocrystalline plutonic igneous rocks composed… … Wikipedia
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
Dacite — Aphanitic QAPF diagram denoting daci … Wikipedia
greisen — /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… … Universalium
Mount Baker — For other uses, see Mount Baker (disambiguation). Mount Baker Mount Baker as seen from the Southeast at Boulder Creek … Wikipedia
Mount Shasta — This article is about the volcano in California. For the town, see Mount Shasta, California. For other peaks named Shasta, see List of peaks named Shasta. Mount Shasta Mount Shasta from the south, taken near Dunsmuir, California … Wikipedia
Mount Adams (Washington) — Mount Adams Mount Adams, 1999 Elevation 12,281 ft (3,743 m) NAVD 88 … Wikipedia
Grand Canyon of the Yellowstone — The Grand Canyon of the Yellowstone is a large canyon of the Yellowstone River that is located in Yellowstone National Park in the United States. The canyon is up to 900 feet deep (275 m) and a half mile (0.8 km) in width. It is not the canyon… … Wikipedia
Lamprophyre — Lamprophyres (Greek λαµπρός (lamprós) = bright and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica… … Wikipedia