Plutonic ternary diagram how to#
Plutonic ternary diagram code#

Sandstone <- read.table('provenanceExample.txt', header=TRUE, row.names=1, sep=',') The plots will work in all cases, provided you are consistent.ДЇor this example, I will read in the data and assign it to a data frame called sandstone. Last, your columns can be simply the counts of grains, or they can be converted to percentages (0вЂ“100) or proportions (0.0вЂ“1.0). In other words, each of your grains should be counted in only one column for example, don't include a single grain in both the plagioclase and feldspar columns. Likewise, the lithic value will be the sum of the lithic, plutonic, volcanic, metamorphic, sedimentary, and shale columns (and sometimes chert, depending on the plot). For example, the total amount of feldspar will be calculated as the sum of the plagioclase, kfeldspar, and feldspar columns. Note that the plots are smart in aggregating the data. If you have other grain types, such as if you have split out the lithic grain types even more finely, you will need to modify the data frame function ( ternaryValues()) to use your variable names. If you do not have a particular type of grain, you do not need to include that column in your data frame. Note that the вЂfeldsparвЂ™ and вЂlithicвЂ™ columns are for those grains that cannot be assigned more precisely, such as a feldspar that cannot be assigned to kfeldspar or plagioclase. In particular, the functions expect to see these column names (case and spelling matter): quartz, chert, plagioclase, kfeldspar, feldspar, lithic, plutonic, volcanic, metamorphic, sedimentary, and shale. The functions assume certain names for the grain types, and these must match exactly. The data should be set up in a data frame, with columns for the grain types, and samples in rows.

Plutonic ternary diagram how to#

See my previous post on making ternary diagrams to understand how to use those functions.

Plutonic ternary diagram code#

Source code for this project is contained in sandstoneProvenance.r, and the source code for making ternary diagrams ( ternary.r) is also required. A single function, provenancePlot(), is used to create all of these plots. IвЂ™ve created R code for making the four most common of these ternary diagram provenance plots. The provenance or plate tectonic source of sandstones is commonly inferred from point counts of their constituent grains (Dickinson and Suczek 1979). 31 October 2016 Updated 7 December 2018 to allow for more grain types and faster plotting.