replacement deposits

См. также в других словарях:

• metasomatic replacement — Process of simultaneous solution and deposition in which one mineral replaces another. It is the method by which wood is petrified (silica replaces the wood fibres), minerals form pseudomorphs (new minerals that preserve the characteristic… …   Universalium

• Carbonate hosted lead zinc ore deposits — World wide distribution of MVT deposits, (red), clastic sediment hosted (green), and unclassified (blue) lead zinc deposits. Source: USGS Carbonate hosted lead zinc ore deposits are important and highly valuable concentrations of lead and zinc… …   Wikipedia

• Eastern span replacement of the San Francisco — San Francisco – Oakland Bay Bridge (eastern span replacement) Artistic rendition of the new eastern span of the Bay Bridge seen from Treasure Island (ca. 2014) Official name To be determ …   Wikipedia

• Sedimentary exhalative deposits — (abbreviated as SEDEX from SEDimentary EXhalative) are ore deposits which are interpreted to have been formed by release of ore bearing hydrothermal fluids into a water reservoir (usually the ocean), resulting in the precipitation of stratiform… …   Wikipedia

• Channel-iron deposits — (CID) are iron rich fluvial sedimentary deposits of possible Miocene age occupying meandering palaeochannels in the Early to Mid Tertiary Hamerlsey palaeosurface of Western Australia. Examples are also known from Kazakhstan. The deposits are… …   Wikipedia

• Copper mining in the United States — US primary copper production 1900 2008. Source: USGS …   Wikipedia

• Silver mining in Nevada — Silver mining in Nevada, a state of the United States, began in 1858 with the discovery of the Comstock Lode, the first major silver mining district in the United States. Nevada calls itself The silver state . In 2006, Nevada was the nation s… …   Wikipedia

• Silver mining in the United States — began on a major scale with the discovery of the Comstock Lode in Nevada in 1858. The industry suffered greatly from the demonetization of silver in 1873 by the Crime of 73, but silver mining continues today.The United States produced 1,200… …   Wikipedia

• hydrothermal mineral deposit — ▪ geology       any concentration of metallic minerals formed by the precipitation of solids from hot mineral laden water (hydrothermal solution). The solutions are thought to arise in most cases from the action of deeply circulating water heated …   Universalium

• Coloradoite — from the La Plata District of Colorado General Category Telluride mineral …   Wikipedia

• sphalerite — /sfal euh ruyt , sfay leuh /, n. a very common mineral, zinc sulfide, ZnS, usually containing some iron and a little cadmium, occurring in yellow, brown, or black crystals or cleavable masses with resinous luster: the principal ore of zinc and… …   Universalium