Apologies for the delay in putting the new ds6 dataset up on the web. It
has turned out to be more work than expected to sort out aspects arising
from it, and appropriate a-x files are still under development.
For anyone interested, the latest Holland and Powell 2011 dataset (DS61)
is now (finally) up on the THERMOCALC website. Go to the following page
and hit the DS6 icon on the left
Please note that this dataset will only work with the version of
THERMOCALC that is included in the download.
The new dataset can only be used in a limited capacity at the moment as
the existing (ds55) era a-x models are inappropriate for use with the
new dataset. See below for more details.
The transition from tc-ds55.txt to tc-ds61.txt is non-trivial for all
concerned, including you the user. Much has changed. For those of you
who are mid-project it is not wise to think of jumping to the new
dataset unless there is something specifically in the new dataset that
will dramatically improve your modelling. The dataset, tc-ds55.txt, and
accompanying axfiles have been widely used and are considered to be
quite stable, as well as being good at reliably modelling the majority
of rocks. So keeping on using tc-ds55.txt is your best plan for projects
For use with the new dataset, many of the existing activity-composition
relationship codings in axfiles will need to be modified, mainly because
the underlying assumptions in dataset generation have changed
substantially in the intervening 8 years between tc-ds55.txt and
tc-ds61.txt. The existing ds55-generation axfiles should NOT be used
with tc-ds61.txt as this will in most cases result in erroneous results
(e.g. with biotite, amphibole, melt). There are other codings (e.g.
chlorite, cordierite) that we are taking this opportunity to upgrade
because the current ones, for various reasons, are obsolete. Our aim, of
course, is to make these new axfiles as stable and reliable as the old
ones. Clearly this is a big job - one that we are working hard on - so
please be patient and await their release on the website. Of course, in
the mean time you can use tc336 for calculations on end-members with
tc-ds61.txt (e.g. with modes 0 and 3) to look at the new dataset. (This
version of THERMOCALC (tc336) is fully backwards compatible).
Institute of Geoscience
University of Mainz
Fax: +49 6131 39 23863
Phone: +49 6131 39 24781
THERMOCALC web: http://www.metamorph.geo.uni-mainz.de/thermocalc/index.html