00000nam 2200000za 4500 9.822846 CaOODSP 20230131161137 cr ||||||||||| 160817s2013 oncbo o f000 0 eng d CaOODSP eng n-cn--- M45-95/2013E-PDF The Targeted Geoscience Initiative 4 - intrusion-related ore systems [electronic resource]. [Ottawa] : Natural Resources Canada, c2013. [4] p. (un-numbered pages) : col. ill., col. map. Earth Science Sector, general information product ; 95e Issued also in French under title: Initiative géoscientifique ciblée 4 - systèmes minéralisés liés à des intrusions. Intrusion-related ore systems are formed when molten rock (magma) intrudes into the Earth's crust but solidifies before it can reach the surface. Because this magma cools very slowly, there is enough time for large mineral crystals to grow, which produces many intrusive rocks that have a coarse-grained, granite-like texture. Some of these rocks may grow crystals that are significantly larger than the rest and have one or more minerals. These are called 'porphyry' rocks. As porphyry rocks cool and crystallize, they can produce large volumes of hot, salt-rich fluids that carry high concentrations of base metals such as copper, molybdenum, tungsten and tin. gccst Geology gccst Scientific research gccst Metals gccst Minerals Canada. Natural Resources Canada. Geological Survey of Canada. Initiative géoscientifique ciblée 4 - systèmes minéralisés liés à des intrusions (CaOODSP)9.822849 General information product (Canada. Natural Resources Canada) 95e (CaOODSP)9.822750 PDF 784 KB https://publications.gc.ca/collections/collection_2016/rncan-nrcan/M45-95-2013-eng.pdf 292845