You will learn to recognize and identify them as you study the rocks.ĬOMPONENTS OF SILICICLASTIC SEDIMENTARY ROCK COMPOSITION > Matrix (a catchall for the silt and clay grains that cannot be easily seen by eye).ĭescriptions of each category are below. > Lithic fragments (including rock fragments and mineral grains other than quartz) But in most cases rock composition can be defined by four compositional components: In addition, any incompletely weathered piece of igneous, sedimentary, or metamorphic rock can also be found in a sedimentary rock.Ī composition classification could become very complicated if all of these different particles were considered. After all, there are over 6000 known minerals. It might seem that an unlimited variety of particles could end up in a sedimentary rock. Thus, an arkose sandstone is a rock of sand sized particles, with a high percentage of those particles being feldspar. But any full rock name must specify both texture and composition. The basic classification only concerned texture, using the Wentworth size scale. SH.Sedimentary rocks are classified on the basis of the texture (grain size) of the rock, and composition.restore: Undo the effect of hydraulic sorting.csv file with continuous (detrital zircon) data radialplot: Visualise point-counting data on a radial plot.provenance: Menu-based interface for 'provenance'.procrustes: Generalised Procrustes Analysis of provenance data.plot.minsorting: Plot inferred grain size distributions.plot.KDEs: Plot one or more kernel density estimates.plot.KDE: Plot a kernel density estimate.plot.INDSCAL: Plot an INDSCAL group configuration and source weights.plot.GPA: Plot a Procrustes configuration.plot.distributional: Plot continuous data as histograms or cumulative age.minsorting: Assess settling equivalence of detrital components.KS.diss: Kolmogorov-Smirnov dissimilarity.KDEs: Generate an object of class 'KDEs'.indscal: Individual Differences Scaling of provenance data.GPA: Generalised Procrustes Analysis of configurations.get.p: Calculate the probability of missing a given population.get.n: Calculate the number of grains required to achieve a desired.get.f: Calculate the largest fraction that is likely to be missed.endmembers: Petrographic end-member compositions.diss: Calculate the dissimilarity matrix between two.densities: A list of rock and mineral densities.combine: Combine samples of distributional data.central: Calculate central compositions.botev: Compute the optimal kernel bandwidth.as.compositional: create a 'compositional' object.amalgamate: Group components of a composition.
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