* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Environmental Geochemistry I.
Survey
Document related concepts
Global Energy and Water Cycle Experiment wikipedia , lookup
Evolutionary history of life wikipedia , lookup
Geomorphology wikipedia , lookup
History of Earth wikipedia , lookup
History of geology wikipedia , lookup
Age of the Earth wikipedia , lookup
Large igneous province wikipedia , lookup
Provenance (geology) wikipedia , lookup
Algoman orogeny wikipedia , lookup
Composition of Mars wikipedia , lookup
Transcript
Environmental Geochemistry I. Aleš Bajer Tento projekt je spolufinancován Evropským sociálním fondem a Státním rozpočtem ČR InoBio – CZ.1.07/2.2.00/28.0018 Environmental Geochemistry Selected topics: The Earth and Lithosphere The structure of the Earth Principles of Geology Internal (endogenic) processes: Plate tectonics, Earthquakes, Volcanoes Surface processes: Weathering, Mass Wasting Principles of Soil Science Environmental Geochemistry Selected topics: Water and hydrosphere The hydrologic cycle Oceanic circulation Composition of sea water Fresh water Ground water Glaciers and Ice Ages Desert and desertification Human impact on water Environmental Geochemistry Selected topics: Atmosphere Structure of the atmosphere Composition of the atmosphere Origin and evolution of atmosphere Human impact on the atmosphere Environmental Geochemistry Selected topics: Biosphere Biogeochemical evolution, Gaia hypothesis Waste and Waste management Mineral and energy resources Alternative energy resources Environmental geochemistry Seminar work: themes: Ecological problems of your hometown or country Geochemistry – current important problems for example : Expansion of solar energy in CZ Fresh water pollution (Brno dam) Motor - vehicle traffic in cities etc……. - 5 pages max. - PowerPoint presentation (15 - 20min.) Environmental geochemistry Exam: Possible after presenting your seminar work and handing over it in writing form. written test Structure of the Earth Theory of Earth layers - Core: Fe, Ni Inner Core Outer Core - Mantle: denser than Crust, Fe, Mg, Silicates - Crust: thin surface layer (8 elements, O, Si, Al, Fe, Ca, Mg,K, Na) Continental crust Oceanic Crust Structure of the Earth Theory of Earth layers - Hot layer „Asthenosphere“ between Mantel and Crust - Rigid crust floats on plastic Asthenosphere Plate tectonics theory - above surface layers: Hydrosphere Atmosphere Biosphere Structure of the Earth Geochemical classification of the elements -lithophiles: elements concentrated in the crust Si, Al, Mg, Ca etc. - chalcophiles: element (metal) concentrated in crust combination with sulfur - Cu, Zn, Pb, Sn etc. important ore minerals -siderophiles: element concentrated in core – Ni, Fe, Co, Pt, Au… -atmosphiles: volantile elements, concentrated in the atmosphere H, N, He, innert gasses Structure of the Earth The Earth´s Crust -The thinnest and outermost layer (cool, rigid, brittle) - Two types: Oceanic crust : 5-10 km thick, composed mostly of basalt Continental crust: 22 – 50 km thick, composed mostly of granitic rocks Structure of the Earth Plate Tectonics - The rigid lithosphere floats on the asthenosphere - the litosphere is broken into seven large and several small plates - plates moved in different directions - three types of plate boundaries Structure of the Earth Structure of the Earth Structure of the Earth Structure of the Earth Structure of the Earth Structure of the Earth Earthquakes - is a vibration generated by sudden slippage of rocks along the fault - occur along tectonic plate boundaries - produce seismic waves (primary waves P, shared waves S) - measurement by seismograf Structure of the Earth Earthquakes damage - landslides - tsunamis Structure of the Earth Earthquakes damage Structure of the Earth Volcanoes - Magma forms in three geologic environments: subduction zones spreading centers (ridges) especially mid-oceanic ridges, basaltic magma mantle plumes (hot spots), Hawaiian Islands - many types of volcano exist Structure of the Earth Volcanoes Structure of the Earth Volcanoes Structure of the Earth Volcanoes – forming of Caldera Structure of the Earth Mass Wasting -main factors: steepness of the slope rock type and layer orientation water and vegetation earthquakes and volcanoes Structure of the Earth Types of Mass Wasting Principles of Geology Minerals - fundamental building component of rocks - natural, anorganic, with crystaline structure and characteristic chemical composition - made up of elements (gold, quartz, pyroxene) Main rock forming minerals - only 20 of 3000, 10 = 90% rocks (Feldspar, Pyroxene, Amphibole, Mica, Clay Minerals, Olivine – Quartz, Calcite, Dolomite) Important mineral groups - oxides, sulfides, sulfates, halides, carbonates, phosphates, native elements, silicates Minerals Feldspar - more than 50% of the Earth´s crust - major component of common rocks - 2 groups: orthoclase (K) plagioclase (Ca, Na) - resourse of mineral nutrients Pyroxene - dark colour - Mg, Fe - occur in mafic rocks Amphibole - similar to pyroxene - more stabile than pyroxene Minerals Mica - plate shaped - muscovite (K) - biotite (Fe, Mg) - occur in continental crust (igneous and metamorphic rocks) Clay minerals - formation from Feldspar by weathering - small crystals - occur in surface rocks (sedimentary) - important component of soil Olivine - green - mainly in oceanic rocks - togehter with pyroxene in mantle rock Minerals Carbonates - calcite, dolomite - near surface - made up of organism bodies (corals) - occur in sedimentary rocks (limestone) Other important minerals Ore minerals - pyrite, chalcopyrite, galena, sfalerite – metal ore - gold, silver, copper - halite, gypsum, barite – building material Accesory minerals - rock forming (small amount) - chlorite, serpentinite, garnet, limonite, epidote Rocks 3 main types: igneous, sedimentary, metamorphic rock cycle igneous rock – weathering – sediments – litification – sedimentary rock – metamorphism – metamorphic rock – melting – magma – solidification – igneous rock There could be more variants of cycle. Igneous rocks - forms from magma - 2 group: intrusive (volcanic) rocks, plutonic rocks - granite – rhyolite, diorite – andesite, gabro - basalt Rocks Sedimentary rocks - made up of all kinds of rocks during the weathering (decompose) - devided into three types: clastic, organic and chemical clastic can be: disintegrated (unconsolidated) – small fragments rocks: clay, silt, sand, gravel consolidated (cemented) – fragments are lithified by solution under the pressure: conglomerate, sandstone, shale, limestone - most widespread rocks on the surface - formed by process called erosion - important term is a transport by wind, gravity, stream …..and deposit - main soil forming rocks - limestone can be formed by clastic, organic and chemical processes Rocks Relative abundance of sedimentary rocks Rocks Metamorphic rocks - formed by sedimentary and igneous rocks during increased temperature and pressure - at metamorphism the composition and the texture are changing - special metamorphic minerals: garnet, actinolite, chlorite, sillimanite… - the texture is changing to coarser grain, layer texture (foliation) - limestone – marble - sandstone – quartzite - shale – low slate, middle schist, high gneiss - other metamorphic rocks: amphibolite, eclogite, granulite Rocks Rock cycle: rocks are continously changed over geological time Soils - thin layer formed by interaction among lithosphere, atmosphere, hydrosphere and biosphere, so called pedosphere - contain 4 substances: mineral matter, organic matter, air, water - a thin, fragile and vanishing resource - soil is the basic natural resource (Aldo Leopold) - important process is weathering (decomposition and desintegration) - two types of weathering: mechanical and chemical Soils - mechanical weathering is desintegration of rock into small pieces and 6 main processes are involved here: - unloading – causes the small cracks and thin layers - freezing and thawing – expansion force of water, occur in daily cycle - heating and cooling – contraction and expandion is different for different colour of minerals and rocks, this changes lead to exfoliation - wetting and drying – important at clay minerals - organism – generally reduces size of rocks and minerals - chemical weathering is decomposition of minerals and rocks as chemical reactions transform them into new chemical combinations, there are involved 6 main processes Soils - chemical weathering is decomposition of minerals and rocks as chemical reactions transform them into new chemical combinations, there are involved 6 main processes - dissolution – is dissolving of solid in liquid, for example NaCl and CaCO3 - hydrolyses – is procces of reaction with water to form hydroxydes, very important for soil forming - acidification – natural water is weak acid that dissolves minerals and rocks, some manmade air pollutants make up strong acid that accelerates natural chemical weathering - hydration – is combination of a solid mineral with water, this reaction causes increasing of chemical structure - oxidation – very important on surface, mineral reaction with oxygen, most evident in iron-rich minerals - reduction – important process in stagnant water condition – grey-blue colour is typical Soil profile - soil body consists of several layers called soil horizons - on surface there is material called litter (dead plant or animal matter) - surface horizon – O horizon mixture of organic component (litter and humus) and small amount of minerals - A horizon mineral horizon that is dark colour due to high contents of organic matter, it is mixture of sand, silt and clay - E horizon develops zone of elluviation (leaching), all matter is removed down, typical light colour (white colour) -B horizon horizon of accumulation or illuviation, typical brown colour due to iron mineral coloids Soil profile -C horizon zone of litter altered parrent material by soil-forming processes Main processes: - additions, for example organic matter - losses (leaching) - translocations, movement of organic matter, clay, nutrients from one layer to another - transformation, clay, primare minerals to secondary minerals Soil forming factors - Parent rock strong influence that sinks during the time, provides nutrients - Climate influence on horizons development - Geomorphology orientation of slope, northern slope means more intensive and deep development of soils southern slope means retarded development of soils - Time more older = more differential soil profile - Man fertilization, erosion, occupation of quality land (stocks etc.) Time Climate impact on Soil Brief history of life Human precursors 8 – 5 mil. years Primitive man 1 mil. Years Homo sapiens sapiens 40.000 years