Hello,
you can estimate density from the molar volume of constituent oxides. XRF analysis will you the chemical composition and you can calculate the molar volume of every oxide at desired PT. There are some data for the major rock forming oxides.
Once you have the oxide data and PT from thermobarometry/other estimates, you can easily calculate the density and even the viscosity.
Bottinga and Weill (1970) is the reference for this purpose.
Pritam
________________________________________
From: Tectonics & structural geology discussion list [[log in to unmask]] on behalf of Dennis Brown [[log in to unmask]]
Sent: Saturday, August 27, 2011 2:02 PM
To: [log in to unmask]
Subject: Re: Density Ranges of Migmatites
If you want to go the second route that Ernie points out, then I suggest
that you use an Excel spread sheet called Physprops. It is done by Bradley
Hacker and can be found (or could be) on his web page. If you do this, I
strongly suggest that you also get the publication related to it from
G-cubed (it is probably on Hackers web page as well) which tells you how
everything works.
Dennis
> Do you mean density in the crystallized state, or partially molten? As a
> guide, the density of granite is about 2.7 g/cc, and granitic melt is
> about 0.4 g/cc less, so you can estimate the overall density from the
> fractions of the solid and liquid components. A more sophisticated
> estimate will take fully into account the mineralogy, total pressure,
> temperature and water pressure effects.
> Ernie Rutter
>
> -----Original Message-----
> From: Tectonics & structural geology discussion list
> [mailto:[log in to unmask]] On Behalf Of Soumyajit Mukherjee
> Sent: 27 August 2011 05:05
> To: [log in to unmask]
> Subject: Density Ranges of Migmatites
>
> Hi all,
>
> While developing an analytical model on extrusion of the Higher
> Himalaya, I was looking for the density range for migmatites. I
> searched a lot in various textbooks, papers and handbooks but couldn't
> get any. Could you let me know the range along with full references?
>
> Thank you in advance!
>
> Sincerely,
> Dr. Soumyajit Mukherjee
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