Abstract
As illustrated in previous chapters, many geological features display random characteristics that can be modeled by adopting methods of mathematical statistics. A question to which new answers are being sought is: Where does the randomness in Nature come from? Nonlinear process modeling is providing new clues to answers. Benoit Mandelbrot discovered about 50 years ago that many objects on Earth can be modeled as fractals with non-Euclidean dimensions. Spatial distribution of chemical elements in the Earth’s crust and features such as the Earth’s topography that traditionally were explained by using deterministic process models, now also are modeled as fractals or multifractals, which are spatially intertwined fractals. Which processes have produced phenomena that are random and often characterized by non-Euclidian dimensions? The physico-chemical processes that have resulted in the Earth’s present configuration were essentially deterministic and “linear” but globally as well as locally they may display random features that can only be modeled by adopting a non-linear approach that is increasingly successful in localized prediction. The situation is analogous to the relation between climate and weather. Longer term climate change can be modeled deterministically but short-term weather shows random characteristics that are best modeled by adopting the non-linear approach in addition to the use of conventional deterministic equations. This chapter reviews fractal modeling of solid Earth observations and processes with emphasis on topography, thickness measurements, geochemistry and hydrothermal processes. There is some overlap with multifractals that will be discussed in more detail in the next two chapters. Special attention is paid to improvements in goodness of fit and prediction obtained by non-linear modeling. The spatial distribution of ore deposits within large regions or within worldwide permissive tracts often is fractal. Illustrative examples to be discussed include lode gold deposits on the Canadian Shield and worldwide podiform Cr deposits, volcanogenic massive sulphide and porphyry copper deposits. The Pareto distribution is closely associated with fractal modeling of metal distribution within rocks or surficial cover in large regions. The Concentration-Area (C-A) method is a useful new tool for geochemical prospecting to help delineate subareas with anomalously high element concentration values that can be targets for further exploration with drilling.
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Agterberg, F. (2014). Fractals. In: Geomathematics: Theoretical Foundations, Applications and Future Developments. Quantitative Geology and Geostatistics, vol 18. Springer, Cham. https://doi.org/10.1007/978-3-319-06874-9_10
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