Geochronology and Isotope Geochemistry
|Probability Density Function and Histogram for data with uncertainties
Import data from Excel spreadsheets and calculate
the probability density function for the data and the histogram
representing the ages. May be used for large data sets which might
not be handled by other Excel-based packages. The pdf curve and
histogram values may be exported for publication-quality graphing
in other programs. Now also calculates stratigraphic, 'view from above'
probability plots for multiple samples or lithostratigraphic units to
illustrate detrital zircon ages relative to stratigraphic age and
cumulative probability curves. The latter are classified and colour
coded according to the scheme introduced by Cawood et al. (2012).
|Extract 'raw' data from spreadsheets for DateView
Import data from Excel spreadsheets for use in DateView database.
Collate and check data ready for import.
|Geodate isotope software
Isotope regression and calculation software.
Perform a variety of regression calculations, determine model ages,
initial ratios, epsilon or gamma values, weighted averages. Convert
zircon data (inluding error correlations) from Wetherill to
Tera-Wasserburg formats. Data may be read from custom GeoDate files
or imported from Excel spreadsheets. This 2016 version 4 program has been modified
to be suitable for use with Windows 7, 8 and 10 operating systems. A version is also under development
for Mac OS X.Most recent update of installation file posted 2016/07/11.Documentation for this software is available as
A new version of the documentation is being prepared and will be posted when available.
|U-Pb isotope open system modelling
Forward model the effects of open system behaviour
in two-stage U-Th-Pb isotope systems. Users may select a range in
238U/204Pb and 232Th/204Pb ratios at the time a system is disturbed
so as to investigate changes graphically.
desktop geochronology database system
Software for use in a desktop PC computer environment.
Users may compile geochronological information utilising a
user-customisable database system which has an easy user interface.
The capabilities of this package have been described in
Eglington (2004) Computers and Geosciences, vol. 30, p847-858.
The download provides an empty database (it does not include data
previously captured by the author). These data are now available
from the web version of DateView, which is available from the Database
page of this site. Documentation for this software is available as
Geochemistry and Petrology
|CIPW, meso- and kata-norm calculator
Calculates CIPW, Meso- and kata-norms based on data
imported from Excel spreadsheets. In addition to providing normative
mineral compositions, the program calculates a variety of geochemical
projections and ratios often used during petrological investigations.
All calculated values may be exported to Excel spreadsheets for use
in other programs or for graphing.
|South African lithostratigraphic database
User-friendly interface and database of South African
lithostratigraphic units. Formations compiled in this database are from
the South African Council for Geoscience's corporate database and include all formally
recognised stratigraphic units. Documentation for this software is available as
The contents of this desktop system
are now available on-line using the program StratDB, which can be found on the
database page of this site.
|Multivariate statistical analysis software
Multivariate statistical analysis software for use
in exploratory data analysis. Data are read in from Excel spreadsheets.
Techniques incorporated in the package are: Simultaneous R- and Q-mode
component analysis; Principal component analysis; Correspondence
analysis; Discriminant analysis. Data may be transformed using
log-normal or centered log-ratio approaches prior to analysis. Various
non-parametric statistics are calculated and variables are portrayed
as histograms, sequence plots, quantile-quantile plots and box plots.
Plots of sample locality (X-Y-Z) may be produced with symbols coded
to EDA box plot classifications in order to assess the spatial
distribution of outliers. This version of the software is limited to
10 variables and 200 samples but users may contact
to obtain a version capable of processing larger matrices.
|Compare two curves with equivalent x axes
Software facilitates the comparison of two curves
which have equivalent x axis parameters. For instance, one may wish
to compare two probability density curves derived from geochronological
investigations or compare two isotope proxy curves for a given time
period. this software utilises non-parametric geostatistical
techniques for the comparison. This is an alpha test version of the
|Compute weighted time variation curves
Software calculates weighted and standard moving
averages for a data series. The weighted moving averages are based
on weighted splines curve fitting which takes analytical uncertainties
into account. The degree os smoothing is user-customisable. Standard
moving averages may also be caclulated but are known to distort the
location of peaks in time series data as a function of the number of
points included in the moving average. This distortion is not present
when using the weighted moving average technique.
Mass spectrometer control, data reduction and diagnostics
view of amplifier gain information for Thermo Triton and Neptune
Software for use in a desktop PC computer environment.
Users should first convert the GainHistory.log file from either Triton or Neptune
instruments into MicroSoft Excel format (just open the original file and save
as an Excel file). This file is then imported into the GainLog program
and users may check out graphical views of the gain variation on different
amplifiers through time.