igneous concentration
111Volcanogenic massive sulfide ore deposit — Volcanogentic massive sulfide ore deposit at Kidd Mine, Timmins, Ontario, Canada, formed 2.4 billion years ago on an ancient seafloor. Volcanogenic massive sulfide ore deposits (VMS ) are a type of metal sulfide ore deposit, mainly Cu Zn Pb which …
112Iceland hotspot — The Iceland hotspot is a hotspot which is partly responsible for the high volcanic activity which has formed the island of Iceland.DescriptionIceland is one of the most active volcanic regions in the world, with eruptions occurring on average… …
113Halloysite — is a 1:1 aluminosilicate clay mineral with the empirical formula Al2Si2O5(OH)4. Its main constituents are aluminium (20.90%), silicon (21.76%), and hydrogen (1.56%). Halloysite typically forms by hydrothermal alteration of alumino silicate… …
114Chemostratigraphy — or correctly termed Chemical Stratigraphy is the study of the variation of chemistry within sedimentary sequences. The name of the field is relatively young, having only come into common usage in the early 1980s, but the basic idea of… …
115Ozark National Scenic Riverways — IUCN Category II (National Park) …
116Carved Stone Balls — are petrospheres, usually round and rarely oval. They have protruding knobs on the surface, from 3 to 160 in number. Their size is fairly uniform, they date from the late Neolithic to possibly the Iron Age and are mainly found in Scotland. They… …
117Copper mining in the United States — US primary copper production 1900 2008. Source: USGS …
118Phosphogypsum — refers to the gypsum formed as a by product of processing phosphate ore into fertilizer with sulfuric acid. Phosphogypsum is radioactive due to the presence of naturally occurring uranium and radium in the phosphate ore.Marine deposited phosphate …
119Formation evaluation gamma ray — In the field of formation evaluation, gamma ray log records natural radioactivity emission of formation. Measurement of natural emission of gamma rays in oil and gas wells are particularly helpful because shales and sandstones typically have… …
120Evolution of water on Mars and Earth — The evolution of H2O on either planet needs be understood in the context of the other terrestrial planetary bodies and their current H2O inventories.H2O Inventory of MarsA significant amount of surficial H has been observed globally by the Mars… …
