Gary B. Sidder
U.S. Geological Survey
Denver Federal Center
Box 25046, MS-905
Denver, CO  80225-0046
303-236-5607/FAX 303-236-5603
gbsidder@greenwood.cr.usgs.gov


To:		The Public

From:		Gary Sidder

Subject:	PETRO.CALC.PLOT


Petro.exe is a binary self-extracting archive file for Windows. 
petmac.sea.hqx is a self-extracting archive for Macintosh encoded with
BinHex4.  PETRO.CALC.PLOT is a package of macros that run in Microsoft
Excel 3.0 and 4.0 for Macintosh computers.  The macros have also been
written to run in Microsoft Excel 3.0 and 4.0 for Windows. PETRO.CALC.PLOT
minimizes repetition and time required to recalculate and plot whole-rock
oxide data for petrologic analysis.  Macros provided in PETRO.CALC.PLOT
normalize whole-rock oxide data to 100 percent, calculate the cation
percentages and molecular proportions used for normative mineral
calculations, compute the apices for common ternary diagrams, determine
sums and ratios of specific elements of petrologic interest, and plot 33
X-Y graphs and five ternary diagrams.  PETRO.CALC.PLOT may also be used to
create other diagrams as desired by the user. 

PETRO.CALC.PLOT is available from Gary B. Sidder at the above address.  To
order, send a double-sided, high-density 3.5" disk to Gary at the above
address and include a floppy disk mailer for return mail.  Indicate which
version (Macintosh or Windows) of PETRO.CALC.PLOT is desired, and also
indicate whether a paper copy of the text is needed.  The text is in
Microsoft Word 4.0 and WordPerfect 2.1.4 formats; accompanying figures and
tables are in Microsoft Excel 3.0 and Aldus Freehand 3.0. 

The path to run the macros directly from the floppy disk has been entered
and saved.  One may test each of the macros to see how they run by opening
Excel 3.0 or 4.0, opening a macro, pulling down MACRO-RUN from the menu
bar, and selecting OK.  When the d ialog box asks if the macro is running
on the hard disk, answer cancel (no).  Test data files are provided to run
with data macro in the folder calculation macro and test data.  Sample
plot data files are provided for the four graph macros (graph macro-Ha
rker diagrams, graph macro-MgO diagrams, Petrology graph macro, and Æ
graph macro) in the folder plot data for all graph macros.  If the macros
are copied from the floppy disk to your machine with a new hard disk name,
the hard disk path will have to be c hanged for the macros to run. 
Examples are given in the paper and by the macros, too, for how to enter
the hard disk path.  Microsoft Excel does not need to be in the path name
if the macros are not copied into the Excel folder (if the macros are
copied directly onto the hard disk in their own folder).  The macros run a
bit slower on the floppy disk; however, the results are exactly the same. 
TIP:  Close all files after running any macro, and before running the next
macro, by holding down Shift and pull ing down FILE-CLOSE ALL from the
menu bar.  Do not save any changes in the macros, calculationfile,
individual plot files, or the test data or plot data files.  The macros
will run faster with fewer windows open at one time. 

Thank you for trying PETRO.CALC.PLOT.  If you have any questions,
comments, or suggestions about the macros or the text, please contact me
at the above address and numbers. 


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