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(Click for frequent words.) 85 sediment 71 sedimentary rocks 70 sedimentary 69 marine sediments 68 Sediments 67 volcanic rocks 67 silt 66 sedimentary deposits 66 sedimentary rock 66 lavas 66 lake sediments 65 sediments deposited 65 Sediment 64 sedimentary layers 63 basalts 62 sediment samples 62 limestones 61 soils 61 seafloor sediments 61 peridotite 61 carbonate 61 subglacial 61 igneous rocks 61 gravels 61 forams 61 carbonate sediments 60 turbidites 60 sandstones 60 sulfides 60 magmas 60 seafloor sediment 60 volcanics 60 sediment cores 60 sulphidic 60 fine grained sediment 60 basaltic rocks 60 claystone 59 phyllosilicate 59 iron oxides 59 facies 59 silts 59 sulphides 59 volcanism 59 calcite 59 clastic 59 sedimentary sequences 59 dwelling organisms 59 embayments 59 carbonate minerals 59 sedimentary sequence 58 continental crust 58 mudstone 58 basalt 58 clastic sediments 58 microfossils 58 sedimentation 58 diatoms 58 intrusive rocks 58 silty 58 oceanic crust 58 stratigraphy 58 surficial 58 alluvium 58 sand silt 58 glacial till 57 mudstones 57 overlying sedimentary 57 embayment 57 clathrates 57 olivine rich 57 igneous rock 57 jarosite 57 Athabasca sandstone 57 loess 57 sulfide minerals 57 silicate rocks 57 exhalite 57 Neoproterozoic 57 paleochannel 57 volcaniclastic rocks 57 crustal 57 coccolithophores 57 lithosphere 57 carbon isotopes 57 siliciclastic 57 evaporite 57 subglacial lakes 57 diabase 57 silicates 57 lateritic 57 depositional 57 porous sandstone 57 crustal rocks 57 porous limestone 57 colluvium 57 gabbro 57 Sediment cores 56 hydrothermal 56 ultramafic intrusives 56 peridotites 56 ignimbrites 56 clasts 56 overlying sediments 56 granitic rocks 56 Amundsen Sea 56 anorthosite 56 chromitite layers 56 Late Cretaceous 56 dolomites 56 granitic basement 56 foraminifera 56 stromatolite 56 groundwaters 56 tuffs 56 calcareous 56 Ordovician 56 iron sulphate 56 mineralized mafic 56 geochemistry 56 Paleozoic 56 sulphide 56 limonitic 56 andesite 56 pyroclastics 56 basaltic 56 basaltic rock 56 mafic 56 rhyolites 56 granitoids 56 stromatolites 56 tuffaceous rocks 56 sulfate minerals 56 rhyolite tuff 56 biota 56 Neogene 56 carbonate rocks 56 tectonically 56 decaying vegetation 56 volcanic basalt 56 andesitic volcanic rocks 56 intertidal 56 diorites 56 metamorphic rocks 56 geochemical 55 ultramafic rocks 55 halite 55 hydrothermal activity 55 silicic 55 sedimentary strata 55 freshwater aquifers 55 gabbroic 55 andesitic 55 hydrothermal fluid 55 isotopic ratios 55 paleochannels 55 dwelling invertebrates 55 magmatism 55 erosional 55 aerosol particles 55 andesitic rocks 55 hydrothermal fluids 55 sulfidic 55 pyritic 55 dolomite 55 lacustrine 55 mineralized intrusive 55 carbonatized 55 fine grained sediments 55 subsurface 55 outcrops 55 cratons 55 contaminated sediments 55 hydrothermally altered 55 Cretaceous 55 geologic 55 olivine 55 Cambrian Ordovician 55 landforms 55 bathymetry 55 seabed sediments 55 dacite 55 Precambrian 55 glacial sediments 55 zircons 55 ultramafic rock 55 siliceous 55 Middle Devonian 55 siltstone 55 cherts 55 BIFs 55 pyritized 55 gabbros 54 Proterozoic basement 54 advanced argillic alteration 54 gneiss 54 glaciations 54 contaminants 54 metasediment 54 Laurentide ice sheet 54 volcanic sediments 54 carbonaceous 54 plankton blooms 54 contaminated sediment 54 colluvial 54 silica 54 serpentinized 54 pillow lavas 54 sulphide bearing 54 lakebed sediments 54 sulfur isotope 54 gossanous 54 magmatic 54 felsic rocks 54 Upper Jurassic 54 layered ultramafic 54 Paleozoic carbonate 54 saprolitic 54 benthos 54 hydrothermally 54 metasediments 54 Quaternary 54 lakebed 54 isotopic composition 54 sedimentological 54 metamorphic rock 54 hematite mineral 54 basalt volcanic 54 siltstones 54 anhydrite 54 regolith 54 magma chambers 54 mafic rocks 54 palaeo 54 pelitic 54 sediment dredged 54 limestone bedrock 54 silicate minerals 54 kaolinite 54 stratiform 54 microscopic organisms 54 overlying layers 54 interbedded 54 bryozoans 54 Archaean 54 tonalite 54 isotope ratios 54 subtidal 54 fluid inclusions 54 Fe Mn 54 abyssal plain 54 carbonates 53 granite gneiss 53 quartz alunite 53 pollutants 53 Proterozoic 53 stratigraphic sequence 53 Permo Triassic 53 sulfate 53 alluvial soils 53 lunar magma 53 fossils 53 REE enriched 53 hornblende 53 arsenopyrite bearing 53 deglaciation 53 felsic volcanic 53 Proterozoic sediments 53 osmium 53 volcanic tuffs 53 permafrost 53 evaporites 53 pore spaces 53 graben 53 alluvial sediments 53 subducted 53 glaciation 53 supergene enrichment 53 olivines 53 tuffaceous 53 volcaniclastics 53 shell midden 53 volcano sedimentary sequence 53 quartz veinlets 53 Tertiary volcanic 53 methane seeps 53 apatite 53 Sedimentary rocks 53 Palaeozoic 53 silicified limestone 53 Late Paleozoic 53 Earth crust 53 geological strata 53 gabbro dykes 53 hydrated minerals 53 komatiite 53 Dry Valleys 53 detrital 53 phyllosilicates 53 carbonatite dykes 53 inter tidal 53 hematite goethite 53 paleomagnetic 53 quartzites 53 amphibolites 53 silicified zone 53 magma chamber 53 skarn altered 53 mantle plumes 53 vuggy silica 53 outcrop 53 Paleocene 53 gneisses 53 greywacke 53 Upper Triassic 53 Paleozoic sedimentary 53 terrestrial ecosystems 53 felsic volcanic rocks 53 placer deposits 53 salt crystals 53 volcanogenic 53 shallow depths 53 chlorite altered 53 silicified breccia 53 fluvial 53 calcrete 53 oxygen isotopes 53 volcanic tuff 53 Eocene 53 ocean basins 53 subglacial lake 53 volcanoclastic 53 intrusives 53 ejecta 53 dunite 53 ocean sediment cores 53 sedimented 53 silt laden 53 breccias 53 Banded Iron Formation 53 hornfels 53 biotite rich 53 disseminated sulfides 53 pyroxenites 53 tectonics 53 greywackes 53 fine grained sandstone 53 Pliocene 53 lithologies 53 hematite 53 wallrock 53 microbial mats 53 oxidized 52 acid sulphate soils 52 uraniferous 52 vadose zone 52 carbonatite 52 basaltic lava 52 felsic volcanics 52 kimberlitic material 52 metavolcanics 52 pyrite 52 siderite 52 mafic flows 52 Cryogenian 52 sedex 52 breccia 52 geological formations 52 gold bearing gravels 52 komatiitic 52 sulfide deposits 52 Sandstones 52 mineralogy 52 rhyolite tuffs 52 sulfide 52 paragneiss 52 benthic organisms 52 disseminated arsenopyrite 52 granites 52 anticlines 52 Jurassic limestone 52 naturally occurring radium 52 clastics 52 tailings 52 Sediment samples 52 geochronology 52 phytoplankton blooms 52 brecciated 52 plate tectonics 52 tailings piles 52 phytoplankton 52 metasedimentary 52 basin 52 hematized 52 upwelling 52 xenoliths 52 Cretaceous limestone 52 subsoils 52 pyroxenite 52 ferric oxides 52 craton 52 granitic 52 alkalic 52 vertebrate fossils 52 mineralized lenses 52 silicate mantle 52 ignimbrite 52 graphitic 52 sulfide mineralization 52 carbonaceous material 52 geochemical signature 52 Lower Cretaceous 52 granodiorite porphyry 52 radiocarbon 52 lunar crust 52 dolomitic 52 ophiolitic 52 sulphide mineral 52 sulphide minerals 52 magma 52 skarn mineralization 52 disseminated sulphides 52 uranium mineralization 52 brittle deformation 52 flood basalts 52 clay loam 52 volcanic stratigraphy 52 phosphorus concentrations 52 microbialites 52 carboniferous 52 metal zonation 52 salinities 52 planktonic 52 variably altered 52 ophiolite 52 Archean basement rocks 52 alteration halos 52 gneissic rocks 52 concretions 52 isotope composition 52 isotope fractionation 52 ultramafic 52 upwellings 52 organisms 52 sulphate 52 Aptian 52 lithology 52 oxidized mercury 52 geologically 52 subsurface geology 52 mafic intrusion 52 mineralizing 52 sedimentary formations 52 rhyolitic 52 diamondiferous gravels 52 iron sulphides 52 Cretaceous sediments 52 goethite 52 earth crust 52 glacial retreat 52 vanadium mineralization 52 altered granodiorite 52 narrow quartz veins 52 altered porphyry 52 lava tubes 52 Geochemistry 52 sedimentary basin 52 supergene copper 52 eluvial 52 nitrogen fixation 52 outwash 52 felsic intrusive 52 subseafloor 52 mineralizing fluids 51 Cretaceous sandstones 51 basalt flows 51 sulphates 51 Outcrops 51 amphipods 51 diatom 51 volcanic rock 51 peridotite sill 51 permeable sandstone 51 Carboniferous 51 porphyritic 51 mineralized boulders 51 coral skeletons 51 abyssal plains 51 gabbroic rocks 51 komatiites 51 mantle convection 51 saline aquifers 51 microfossil 51 subduction zones 51 dredged sediment 51 microbial organisms 51 amphibolite 51 metasedimentary rocks 51 pelitic gneiss 51 glaciers 51 altered volcanics 51 banded iron 51 plagioclase 51 melt inclusions 51 monzonite 51 granitic rock 51 unconformity 51 ocean currents 51 Upper Cretaceous 51 impermeable shale 51 siliceous sediments 51 algal mats 51 oligotrophic 51 subsurface aquifers 51 sediment sampling 51 basins 51 Middle Eocene 51 mud volcanoes 51 glaciers receded 51 magnetite bearing 51 sulphide mineralization 51 PCBs polychlorinated biphenyls 51 plankton 51 depositional environment 51 disseminated pyrrhotite 51 pyrite marcasite 51 surface outcrops 51 sulfate concentrations 51 subduction 51 sulfur isotopes 51 ultramafics 51 isotopic compositions 51 haematite 51 wetland vegetation 51 Dredged 51 iron carbonate 51 supergene mineralization 51 carbonaceous shales 51 atmospheric methane 51 spherules 51 Cenozoic 51 pyrrhotite chalcopyrite 51 rhyolite 51 Paleozoic sedimentary rocks 51 disseminated sulphide mineralization 51 gravity anomalies 51 macroinvertebrates 51 calcium carbonate 51 shales 51 rhyodacite 51 monazite 51 salinity 51 Sedimentary 51 undersea volcanoes 51 disseminated pyrite 51 magnetite crystals 51 rhyolite porphyry 51 leached capping 51 Gneiss 51 alteration assemblages 51 variably mineralized 51 asthenosphere 51 Alaskite 51 metallic ions 51 manganese mineralization 51 metavolcanic 51 chrysocolla 51 sandstone horizons 51 Ultramafic 51 Lower Jurassic 51 porosity permeability 51 unoxidized 51 Chert 51 Palaeozoic sedimentary 51 pyroxene 51 schists 51 hydrological cycle 51 mineralized breccias 51 coralline 51 Cretaceous Jurassic 51 hydrothermal alteration 51 zinc sulphides 51 sulphide deposits 51 copper mineralization 51 oxygen isotope 51 Tertiary volcanic rocks 51 gold anomalism 51 outcrop samples 51 Sulphide mineralization 51 turbidite 51 deoxygenated 51 shallow overburden 51 karst geology 51 stratigraphically 51 stratigraphic 51 basinal 51 aragonite 51 terrane 51 dissolved oxygen 51 tuffaceous sediments 51 syenite 51 Microcystis 51 KT boundary 51 streambanks 51 meltwater 51 subcrop 51 hydrated silica 51 groundwater aquifer 51 quartz feldspar porphyry intrusive 51 molybdenite mineralization 51 magnetic anomalies 51 quartz vein stockwork 51 granodiorites 51 shear zones 51 mineralized 51 volcanic lava 51 extrusive 51 mineralizing system 51 massive sulfide 51 REE bearing 51 glacial outwash 51 dacite porphyry 51 manganese oxides 51 solids 51 hydrologic cycle 50 kimberlite breccia 50 Precambrian rocks 50 geomorphology 50 specular hematite 50 footwall 50 Soil samples 50 crinoids 50 dredged material 50 dolerite 50 carbonate veins 50 intensely oxidized 50 silica carbonate 50 ocean acidity 50 pyritic rock 50 Laurentide Ice Sheet 50 groundwater 50 greenschist 50 calcic 50 kimberlite indicator minerals 50 interglacial periods 50 pediment gravels 50 alluvial deposits 50 meta sediments 50 intrusive granitic 50 Mg Ca 50 porphyry mineralization 50 porphyry intrusions 50 anomalous mineralization 50 andesites 50 isotopic 50 zinc sulfide 50 norite 50 Middle Jurassic 50 nitrates phosphates 50 massive sulphide deposit 50 evaporite minerals 50 hypersaline 50 Early Cretaceous 50 hydrate deposits 50 atmospheric carbon dioxide 50 ponded 50 Mesoproterozoic 50 eclogite 50 aquifers 50 silica alteration 50 subaqueous 50 benthic 50 altered ultramafic rocks 50 moraines 50 volcanic breccias 50 skarn alteration 50 carbonaceous mudstone 50 volcanic 50 saprolite 50 quartz carbonate veins 50 drainage basins 50 altered andesite 50 aquatic organisms 50 massive sulphide deposits 50 saline aquifer 50 calcium carbonate shells 50 mafic intrusive 50 mafic volcanics 50 Late Ordovician 50 peridotitic 50 supergene 50 quartz feldspar 50 copper Cu 50 biogeochemical 50 anomalous uranium 50 rusticles 50 gabbroic intrusion 50 massive sulphide horizon 50 intertidal zone 50 felsic tuff 50 volcanic gases 50 U Th 50 strontium isotope 50 TCE vapors 50 lithospheric 50 Miocene 50 lithic tuff 50 marine organisms 50 acidification 50 nitrification 50 Doushantuo Formation 50 iron sulfide 50 chloritic 50 porphyritic andesite 50 uraninite 50 mid latitudes 50 Sinus Meridiani 50 Caracol Formation 50 subhorizontal 50 organic compounds 50 mineralized quartz veins 50 insolubles 50 mineralized quartz 50 Schladow 50 inorganic mercury 50 structural lineaments 50 Saharan dust 50 gabbro intrusive 50 felsic 50 metavolcanic rocks 50 dyke swarms 50 jasperoids 50 atmospheric deposition 50 planktonic foraminifera 50 syenite intrusive 50 volcaniclastic 50 basaltic magma 50 tectonic plate movements 50 feldspar porphyry 50 andesite flows 50 sandstone 50 eelgrass beds 50 Messinian 50 albitite 50 mineralization 50 granodioritic 50 overlying 50 rifting 50 greenstones 50 gossan zones 50 stockwork veining 50 auriferous 50 dolostone 50 Phanerozoic 50 biotite 50 andesitic flows 50 Carbonate rocks 50 seafloor 50 Uranium mineralization 50 anoxic 50 Aquifers 50 geochemically anomalous 50 basalt rock 50 AHGZ 50 Oligocene 50 toxic sediments 50 alteration mineralization 50 solar nebula 50 wallrocks 50 hematite alteration 50 Paleozoic sediments 50 McMurdo Dry Valleys 50 shear zone 50 peat soils 50 paleo placer 50 alluvial plain 50 magnetite skarn 50 pyrite veins 50 Balmer Assemblage 50 martian meteorites 50 quaggas 50 molten magma 50 pegmatitic 50 middens 50 coarse sand 50 felsic tuffs 50 hydrothermal venting 50 Wollaston Domain 50 Plio Pleistocene 50 vein quartz 50 intensely silicified 50 massive sulphide mineralization 50 refugia 50 rhyolite domes 50 medium grained 50 diorite intrusive 50 tremolite 50 sulfates 50 PCBs 50 epithermal mineralization 50 outcropping mineralized 50 meta sedimentary rocks 50 anomalous concentrations 50 variably silicified 50 massive sulphides 50 pillow lava 50 chloritized 50 iron sulfate 50 greenschist facies 50 silicate mineral 50 chemosynthetic 50 palaeochannels 50 atmospheric moisture 50 karstic 50 secondary chalcocite 50 pitchblende 50 icesheets 50 streambed 50 Lake Vostok 50 sulfate salts 50 streambeds 50 B Chromitite 50 ultramafic sill 50 KIMs 50 volcanic magma 50 meteorite fragments 50 massive sulfide mineralization 49 igneous intrusive 49 Methyl mercury 49 stockwork zones 49 fluorapatite 49 clastic sedimentary rocks 49 igneous intrusion 49 alunite 49 karst terrain 49 goethite hematite 49 sheared mafic 49 schistose 49 Peridotite 49 geochemical samples 49 acid sulphate 49 vuggy quartz 49 sandstone siltstone 49 silicified rhyolite 49 Mesozoic 49 biotite alteration 49 biogeochemistry 49 pegmatite dykes 49 clay alteration 49 Proterozoic aged 49 dredge spoils 49 hydrothermal vent 49 porphyry intrusives 49 windblown sand 49 thermocline 49 sulfide bearing 49 limestone xenoliths 49 quartz sericite alteration 49 outcrop exposures 49 oceanic circulation 49 rotting vegetation 49 hypoxic zone 49 polymetallic veins 49 tholins 49 dissolved salts 49 felsic intrusive rocks 49 carbonyl sulfide 49 Lophelia 49 mineralized skarn 49 methanogenesis 49 PCBs dioxins 49 footwall rocks 49 ostracods 49 sericite schist 49 chert 49 alteration halo 49 metamorphism 49 Alexandrium 49 ankerite 49 larval fish 49 Devonian limestone 49 pyrrhotite mineralization 49 unconformity uranium 49 mafic volcanic rocks 49 stratigraphic horizon 49 biogeochemical processes 49 illite 49 quartz pyrite 49 reefs 49 Carbonatite Complex 49 pyrite altered 49 limestone 49 groundwater aquifers 49 Unconformity 49 monzonite porphyry 49 bedrock outcrops 49 gold mineralization 49 chondrules 49 quartz adularia 49 granitoid 49 dredgings 49 dacitic 49 seafloors 49 diatremes 49 Tertiary volcanics 49 surface geochemical anomalies 49 surface geochemistry 49 greisen 49 pillow basalts 49 chromitite 49 microbial degradation 49 porphyritic intrusions 49 sea hydrothermal vents 49 mineralized quartz vein 49 Ediacara 49 gyres 49 dust particles 49 granitic pegmatite 49 Transantarctic Mountains 49 geomorphic 49 silty limestone 49 petrography 49 volcanoclastic rocks 49 radiocarbon dates 49 hydrous 49 pelitic gneisses 49 ferruginous 49 silica pyrite 49 Chicxulub impact 49 quartz magnetite 49 carbon isotope ratios 49 airborne radiometric anomalies 49 brachiopods 49 planetesimals 49 Gamba sandstone 49 altered felsic 49 tributary creeks 49 potassium thorium 49 Contaminated groundwater 49 foreland 49 pyrite halo 49 quartz monzonite 49 microbes 49 entrained 49 felsic dykes 49 tephra 49 mineral apatite 49 Geological mapping 49 lamprophyre 49 magnetite BIF 49 glaciers retreated 49 suspended solids 49 overburden thickness 49 chlorite sericite 49 altered felsic volcanic rocks 49 platinum palladium mineralization 49 jasperoid 49 pyrites 49 biogenic 49 speleothems 49 algal species 49 acid leached 49 Mafic 49 veinlets 49 sedimentary basins 49 altered andesitic 49 felsic dikes 49 graphitic horizons 49 eluvial material 49 radiometric anomalies 49 dissolved oxygen levels 49 mineralized horizons 49 paleoenvironmental 49 spatial scales 49 propylitic alteration 49 glacial meltwater 49 breccia zones 49 iron oxide 49 mineralized dikes 49 mudsnails 49 gossan 49 downwelling 49 tectonic activity 49 granitoid rocks 49 carbonate ions 49 interlayered 49 antimony mineralization 49 Devonian 49 calcareous sandstone 49 ocean ridges 49 Arsenopyrite 49 groundwater plume 49 permafrost melts 49 Jurassic formations 49 riparian zones 49 shallow aquifers 49 stibnite 49 graphitic conductors 49 magnetic susceptibility 49 orogenic