Chemical and Pb-isotope composition of phenocrysts from bentonites constrain the chronostratigraphy around the Cretaceous-Paleogene boundary in the Hell Creek region, Montana
Ryan B. Ickert, Sean R. Mulcahy, Courtney J. Sprain, Jessica F. Banaszak, Paul R. Renne
This repository contains electron probe microanalysis (EPMA) data and median Pb isotopes and the necessary code to produce the compositional diagrams in Figures 4 and 5 of the manuscript.
Cite as:
Ickert, R. B., S. R. Mulcahy, C. J. Sprain, J. F. Banaszak, and P. R. Renne (2015), Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous-Paleogene boundary in the Hell Creek region, Montana, Geochem. Geophys. Geosyst., 16, 2743–2761, doi:10.1002/2015GC005898.
Code and data set archived on Zenodo:
-
code: r scripts for generating plots
- fsp-ternary.md: Plot ternary feldspar compositions in Figure 4
- ttn-ternary.md: Plot ternary titanite compositions in Figure 4
- mds-plot.md: Plot MDS diagram in Figure 5
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data: raw data used in analysis
- feldspar.csv: feldspar weight% oxides and formulas
- titanite.csv: titanite weight% oxides and formulas
- mds-feldspar.csv: feldspar compositional data adjusted for mds
- pb-feldspar.csv: median pb-isotope compositions
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figures: pdf plots from r scripts
- fsp-ternary.pdf: Plot of ternary feldspar compositions in Figure 4
- ttn-ternary.pdf: Plot of ternary titanite compositions in Figure 4
- mds-plot.pdf: MDS diagram in Figure 5
compositions van den Boogaart, K.G., Tolosana, R., and Bren, M., 2014, compositions: Compositional Data Analysis. R package version 1.40-1. http://CRAN.R-project.org/package=compositions
plyr Wickham, H., 2011, The Split-Apply-Combine Strategy for Data Analysis. Journal of Statistical Software, 40(1), 1-29.
robCompositions Templ ,M., Hron,K., and Filzmoser, P., 2011, robCompositions: an R-package for robust statistical analysis of compositional data. In V. Pawlowsky-Glahn and A. Buccianti, editors, Compositional Data Analysis. Theory and Applications, pp. 341-355, John Wiley & Sons, Chichester (UK)
RColorBrewer Neuwirth, E., 2014, RColorBrewer: ColorBrewer Palettes. R package version 1.1-2. http://CRAN.R-project.org/package=RColorBrewer
scales Wickham, H., 2015, scales: Scale Functions for Visualization. R package version 0.2.5. http://CRAN.R-project.org/package=scales
This work is
licensed under a Creative Commons Attribution
3.0 Unported License.
