Related by context. Frequent words. (Click for all words.) 65 carbonate 56 sedimentary rocks 56 sulphides 56 hydrocarbons 54 shales 54 sediments 53 sedimentary 53 sulfides 53 sandstones 52 sedimentary rock 52 sulphide 52 Ordovician 51 olivine 51 granites 51 intrusive rocks 50 volcanics 50 silicate 50 sulphate 50 dolomite 50 volcanism 49 stratigraphic 49 stratigraphy 49 volcanic rocks 49 crustal 49 oxidized 49 basalt 49 hydrothermal 48 brines 48 sulfide 48 oxidised 48 gabbro 48 breccia 48 geochemical 48 gas hydrates 48 calcite 48 alkali 48 organic compounds 48 magma 48 hydrothermal alteration 47 silica 47 uranium mineralization 47 kimberlite 47 sulphide mineralization 47 andesite 47 hematite 47 iron oxide 47 outcrop 46 subsurface 46 geological formations 46 pegmatites 46 copper mineralization 46 silicified 46 saprolite 46 shallow depths 46 pyrite 46 gravels 46 silicification 46 massive sulphides 46 massive sulphide mineralization 46 geologically 46 clays 46 Devonian 46 unconformity 45 breccias 45 geochemistry 45 Eocene 45 pyrrhotite 45 water vapor 45 pegmatite 45 magnetic anomalies 45 porphyry 45 chalcopyrite 45 zinc mineralization 45 footwall 45 quartz veining 45 calcium carbonate 45 sphalerite 44 hydrocarbon 44 feldspar 44 mineralization 44 mineralized 44 lithologies 44 Proterozoic 44 massive sulphide 44 Precambrian 44 mafic 44 soluble 44 ultramafic 44 brecciated 44 skarn 44 geologic 44 mineral 44 Cretaceous 43 outcrops 43 amines 43 molybdenite 43 overlying 43 oxidation 43 hydroxyl 43 granodiorite 43 plate tectonics