6. Geochemistry of sedimentary rocks, cathode luminiscence€¦ · G.Faure (1986): Principles of...
Transcript of 6. Geochemistry of sedimentary rocks, cathode luminiscence€¦ · G.Faure (1986): Principles of...
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Petrology of Sedimentary Rocks
G421P13, summer semester, 2/1 hours, 3-4th year
6. Geochemistry of sedimentary rocks, cathode luminiscence
Karel MartínekInstitute of Geology and Palaeontology
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trace elementsB, Ba – Boron or Barium in clay minerals as an paleosalinity indicator
Zr, Ti, Ti/Al – proxies for terrestrial input and altered alkaline basic volcanism; Vanadium or other could be used for discrimination of terrigenous and volcanogenic Ti, V usually correlates with Ti in volcanogenic rocks
Rb – proxy for clay
Ba, Pb – proxy for feldspars
.....
environmental magnetismFe minerals – proxy of terrestrial input, weathering intensity (magnetite, hematite, limonite, sulphides, ... could be distinguished)
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stable isotopesδ18O [‰] = ((18O/16Osample -18O/18OSMOW)/ 18O/18OSMOW)*1000
δ13C [‰] = ((13C /12Csample -13C /12CPDB)/ 13C /12CPDB)*1000SMOW, PDB – standards
isotopic fracionation processes in hydrosphere – changes of isotopic composition of water with temperature, lattitude, ice stratigraphy
carbon cycle
carbonate systems, stratigraphy of pelagic carbonates, record of temperature and climatic changes
δ13C organic matter – types of metabolism of aquatic and terrestrial plants
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Up. Permian Wegener Halvo Fm., E. Greenland
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Chemostratigraphy
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paleotemperatures
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Carbon cycle
TDC – total dissolved carbon
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Strontium isotopes – stratigraphy, paleoenvironments
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Strontium reservoirs and cycles
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Cathode luminiscence (CL)
principles: excitation by electron beam, emission of radiance
Mn2+ luminiscence activator, Fe2+ luminiscence inhibitor in carbonates
study of carbonate and quartz cements, recrystallization processes cement stratigraphy, fluid composition and migration history
provenance of clastic material – quartz typology
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Reading:
J.Miller (1988): Cathodoluminiscence microscopy. In: M.Tucker ed.: Techniques in sedimnetology, Blackwell.D.J.Marshall (1988): Cathodoluminiscence of geological materials. Unwin Hyman, Boston.P.Stille a G.Shields (1997): Radiogenic isotope geochemistry of sedimentary and aquatic systems. Lecture notes in Earth sciences 68, Springer.J.Hladíková (1988): Základy geochemie stabilních izotopů lehkých prvků. skripta PřF UJEP, Brno.G.Faure (1986): Principles of isotope geology. John Wiley&sons.P.Fritz a J.Ch.Fontes eds (1980): Handbook of environmental isotope geology. Elsevier.P.K.Swart et al. eds. (1993): Climate change in continental isotopic records. Geophysical monograph 78, AGU.L.Pratt et al. : Geochemistry of organic matter in sediments and sedimentary rocks. SEPM short course 27.J.Parnell et al. (1993): Bitumens in ore deposits. Springer.
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