Dear Dr. Åberg,
Thank you very much for your suggestion. I was able to get in touch with
David Lentz, who also suggested a similar approach, regarding immobile
elements.
Below is Dr. Lentz message.
Best wishes
Gianna Garda.
Data: Fri, 23 Apr 1999 10:45:46 -0300
De: "Lentz, David (DNRE/M&E)" <[log in to unmask]>
Para: "Gianna Maria Garda" <giagarda>
Dear Gianna,
Hi, I personnally don't do the mass balance calculations using NEWGRES, I
used excel spreadsheets now. Craig Leitch one of my coauthors wrote a
program in the late 80's to do the calculations, etc., but I personally
found it too combersome & less flexable than what I needed. I don't think
NEWGRES is even supported or distributed even now. It's much easier to use
the spreadsheet approach, while testing the relative mobilities using basic
statistics (correlations) before, via the MacLean method. Then use Grant
(1986) Econ. Geol. formulation to do the calculations, based on selected
immobile element(s) you've ascertained are important and your least-altered
precursor. Then you have the flexabulity of plotting the net mass changes
using excel (or whatever) style graphics in a spatial sense or by simply
compating x (least-altered) by y altered. etc.
Sorry, I could do a demo, but it's very straight forward and am sure you
could whip it up quickly. I could send you some papers where I've used these
techniques to produce mass-balance calculations in various styles & to suit
specific types of analyses, particularly spatially. If you need a more
detailed explanation or any detailed refs. please just drop me a line.
Best of luck,
dave
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