PřF:G9811 Geochem. exogen. proc. - Course Information

G9811 Geochemistry of exogenous processes

Extent and Intensity

2/1. 5 credit(s). Type of Completion: zk (examination).

Teacher(s)

doc. Ing. Jiří Faimon, Dr. (lecturer)

Guaranteed by

doc. RNDr. Rostislav Melichar, Dr.
Department of Geological Sciences – Earth Sciences Section – Faculty of Science
Contact Person: doc. Mgr. Martin Ivanov, Dr.

Timetable

Mon 11:00–12:50 Bp1,01007, Mon 13:00–13:50 Bp1,01007

Prerequisites (in Czech)

! G9810 Geochem. exogen. proc. && ( (!( PROGRAM ( B - GE )|| PROGRAM ( N - GE )|| PROGRAM ( D - GE4 )|| PROGRAM ( D - GE )|| PROGRAM ( C - CV ))) || ( NOW ( G0101 Occupational healt and safety )&& NOW ( C7777 Handling chemicals )))

Course Enrolment Limitations

The course is also offered to the students of the fields other than those the course is directly associated with.
The capacity limit for the course is 32 student(s).
Current registration and enrolment status: enrolled: 0/32, only registered: 0/32, only registered with preference (fields directly associated with the programme): 0/32

fields of study / plans the course is directly associated with

there are 58 fields of study the course is directly associated with, display

Course objectives

Main objectives can be summarized as advanced understanding of the geochemical processes proceeding under conditions of earth surface, especially:
- physical/chemical/thermodynamic/kinetic aspects of rock weathering
- diffuse model of rock-water interaction
- reaction model - the transition state theory
- nucleation and crystal growth
- geochemistry of clay minerals
- equilibrium models of Al-pH and Al-Si-pH systems
- diagrams of predominant stability in the systems of Na-Al-Si-H2O, K-Al-Si-H2O, and Ca-Al-Si-H2O
- dynamic model of weathering in open system under different climatic conditions

Syllabus

• Rocks stability at surface conditions: Non-stability of igneous and metamorphic rocks. Rock system evolution. Entropy and Gibb's energy. Goldish's scheme.
• Rock weathering: Physical and chemical weathering. Aluminosilicate weathering. Reversibility and irreversibility of processes. The model of diffusion through surface layer. The model of surface reaction. The role of atmosphere and waters. The buffering of waters by CO2. Biogeochemical processes.
• The kinetics of rock-water interaction: Experiments. Box-models. Mass reservoirs, fluxes. Rate equations, rate constants. Steady state, equilibrium. Arhenius' equation. Pre-exponential factor. Activation energy.
• Transition State Theory: Elementary processes. Theory of activated complex. Modeling, computation. Potential barrier. Thermodynamic approach. Rate of interaction. Chemical affinity.
• Saturation state: Thermodynamics of dissolution. Saturation index. Supersaturation, equilibrium and under-saturation of solutions.
• Nucleation theory: Thermodynamics of surfaces. Interfacial surface energy. Polymerization, condensation. Homogenous and heterogeneous nucleation. Clusters, nuclea, and critical nucleus. Potential barrier. Supersaturation influence.
• Crystal growth: Growth mechanisms. Ostwald's step rule, re-crystallization. The formation of secondary mineral phases. Dioctaedral gibbsite layer. Trioctaedral brucite layer. Amorphous SiO2 gels, quartz stability.
• Clay minerals: 1:1 layer minerals: kaolinite, halloysite. Stability and solubility. 2:1 layer minerals: smectite (pyrophyllite, montmorillonite, beidellite), vermiculite. 2:1:1 layer minerals: chlorites.
• Models of secondary phase formation: Al-pH system, equilibrium boundary, solution and mineral stabilities. Al-Si-H2O system, kaolinite, gibbsite, and pyrophyllite stability.
• Diagrams of predominant stability: Na-Al-Si-H2O, K-Al-Si-H2O, Ca-Al-Si-H2O systems. Construction. Stability fields. Equilibrium lines. Reaction path and system evolution.
• Dynamic model of rock weathering: Influence of climatic condition. Annual precipitation. Drainage. Soil water composition and concentrations.

Literature

• Chemical weathering rates of silicate minerals. Edited by Art F. White - Susan Louise Brantley. Washington, D.C.: Mineralogical Society of America, 1995, xv, 583. ISBN 0939950383. info
• DREVER, James I. The Geochemistry of Natural Waters. Prentice Hall, 1997, 450 pp. ISBN 0-13-272790-0. info
• APPELO, C.A.J. and D. POSTMA. Geochemistry, Groundwater and Polution. 1st ed. Rotterdam/Brookfield: A.A.Balkema, 1994, 519 pp. ISBN 905410 106 7. info
• STUMM, Werner and James J. MORGAN. Aquatic chemistry : chemical equilibria and rates in natural waters. New York: John Wiley & Sons, 1995, xvi, 1022. ISBN 0-471-51184-6-. info
• MCLANE, Michael. Sedimentology. New York: Oxford University Press, 1995, xiii, 423. ISBN 0195078683. info
• Diagenesis, I. Edited by George V. Chilingar - K. H. Wolf. Amsterdam: Elsevier, 1988, 591 s. ISBN 0444427201. info
• PFEIFFER, Hubert, Thomas KLUPSCH and Werner HAUBENREISSER. Microscopic theory of crystal growth. Berlin: Akademie-Verlag, 1989, 400 s. ISBN 3055006844. info
• KUKAL, Zdeněk. Základy sedimentologie. 1. vyd. Praha: Academia, 1986, 466 s. info
• MILLOT, Georges. Geology of clays : weathering, sedimentology, geochemistry. New York: Springer-Verlag, 1970, 429 s. info

Assessment methods

Lectures, class discussion, homeworks, reading
2 written tests, final test

Language of instruction

Czech

Further comments (probably available only in Czech)

Study Materials
The course is taught once in two years.
Information on the per-term frequency of the course: Výuka proběhne v podzimním semestru akademického roku 2008/2009.
General note: Vyhledem k účasti na konferenci, přednáška 6.10.2003 odpadá!.

Listed among pre-requisites of other courses

• GS021 Environmental geology
  (G9811 || NOW(G9811) || G9811k || NOW(G9811k)) && (GA921 || NOW(GA921) || GA921k || NOW(GA921k))  

• Enrolment Statistics (Autumn 2008, recent)
  
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