EXPERIMENTÁLNÍ STUDIUM VZNIKU OSCILAČNÍCH VZORŮ REAKČNĚ-DIFUZNÍM MECHANISMEM
Vol.17,No.1-2(2010)
Banded structures are common in geological objects such as minerals and rocks. This paper is focused on a study of inner dynamics of the systems in which these structures can occur. There was performed an experiment to simulate banded structure formed in gel matrix. Mechanisms of regular pattern formation are discussed. The results of the experiment support the concept of selforganisation at formation of banded patterns. Any periodic changes in exterior are not necessary; this kind of pattern is formed by a reactiondiffusion process with feedback in nonlinear mechanism. Aim of this study was to improve method for recognition of nonlinear dynamics in natural geological objects and to bring laboratory experiments closer to real processes.
oscillatory pattern; silica gel; diffusion; selforganisation; nonlinear dynamics
Best, M. – Christiansen, E. H. (2001): Igneous petrology. – Blackwell science, Inc. Oxford, pp. 458.
Fowler, A. – L´Heureux, I. (1996): Self-organized banded sphalerite and branching galena in the pine point ore deposit, northwest territories. – The Canadian Mineralogist. 34, 1211–1222.
Holten, T. – Jamtveit, B. – Meakin, P. (2000): Noise and oscillatory zoning of minerals. – Geochimica et Cosmochimica acta, 64, 1893–1904.
Kai, S. – Müller, S. C. – Ross, J. (1983): Periodic precipitation patterns in the presence of concentration gradients. 2. Spatial bifurcation of precipitation bands and stochastic pattern formation. – Journal Phys. Chem., 87, 806–813.
Krug, H. J. – Brandstädter, H. (1999): Morphological characteristics of Liesegang rings and their simulations. – Journal of Physical Chemics A, 103, 7811–7820.
L´Heureux, I. – Jamtveit, B. (2002): A model of oscillatory zoning in solid solutions grown from aqueous solutions: aplications to the (Ba, Sr)SO4 system. – Geochimica et Cosmochimica acta, 66, 417–429.
L´Heureux, I. – Katsev, S. (2006): Oscillatory zoning in a (Ba, Sr) SO4 solid solution: Macroscopic and cellular automata models. – Chemical Geology, 225, 230–243.
Liesegang, R. E. (1896): Über einige Eigenschaften von Gallerten. – Naturwissenschaftlichen Wochenschrift, 30, 353–363.
Müller, S. C. – Ross, J. (2003): Spatial structure formation in pretipitation reactions. – Journal of Physical Chemics, 107, 7997–8008.
Ortoleva, P. J. (1994): Geochemical self-organization. – Oxford University Press, New York.
Ostwald, W. (1925): Zur Theorie der Liesegang´schen Ringe. – Kolloid-Zeitschrift, 36, 380–390.
Plhoňová, N. (2008): Podmínky vzniku pravidelných vzorů v geologických objektech. MS, PřF MU, 53 str. Brno.
Shore, M. – Fowler, A. D. (1996): Oscillatory zoning in minerals: A common fenomenon. – The Canadian Mineralogist, 34, 1111–1126.
Turcotte, D. L. (1997): Fractals and chaos in geology and geophysics. – Cambridge University Press. Cambridge.