Dear Gönenc

Principally if you have whatever two minerals in equilibrium sharing components as Fe or Mg this is possible (thermometry). Same applies to solid solutions which tend to exsolve in lower temperatures (feldpsars, oxides, sulphides). In the first hand you can try calculation programmens as thermocalc, tweequ etc.

I think an excellent source will be find in:

http://serc.carleton.edu/research_education/equilibria/index.html

But please remember that what the results tell you will be quite case depended. Slowly cooling intrusions are difficult to handle with these methods and a careful consideration of the state of equilibrium is ultimately important. I mean, you need to do a lot of petrographic work and use your light microscope.

I hope the link above will be useful for you. There are also a lot of references.

Regards

Pekka Tuisku

Dear Pekka, thanks for the link, i'll check it immediately.

Besides, in my case, the gabbroic intrusion that i worked on have lots of post-intrusive secondary minerals (amphibole, biotite)which are related with cooling phase as you mentioned. So i have to precisely differentiate each episode : )

Keith Putirka has many works for geothermobarometry of mafic igneous rocks, considering Cpx , Opx, Ol or Fsp. I think his papers will help. Also he has some spreadsheets for calculations. You will find more information and spreadsheets on:

http://www.fresnostate.edu/csm/ees/faculty-staff/putirka.html

Dear Ali, i am aware of the work of Putirka, but i am not sure if they're applicable for intrusive rocks,. As far as i know most of the work he deals generally based on the equilibrium between liquid and the phenocryst assemblages. Maybe two px thermobarometer may be applicable. Anyway thank you very much for suggestion

Hi Gonenc, In the 2008 RiMG volume there are some equations that are calibrated for sub-solidus systems (Eqns. 36-39, on pages 94-95). They are based on the now classic studies of two-pyroxene equilibrium by Brey and Kohler and Wood and Banno. These equations are calibrated using both sub- and supra solidus experiments (since two-pyx equilibrium should not care about the presence or absence of other phases, including liquid).  At my Fresno State web site I have a spreadsheet that provides results from both the new and earlier models. Feel free to contact me directly also (I don't check into RG very often). Best of luck.

Dear Gönenç:

I did my master degree in thermobarometry of intrusive rocks, and analize different methodologies, in many different rock type ranging from leucogranite to gabro.

In my humble experience one important thing, probably the most important, is the petrogenetic and petrographic analysis, previous to decide what to do and what analize.

Have fun!

http://www.tesis.uchile.cl/tesis/uchile/2007/dzogolyk_ev/sources/dzogolyk_ev.pdf

Dear Gönenç,

Of course all the synthesis by Keith Putirka are perfect, he proposes some thermo and baro meters based on two minerals or on single minerals, both without melt. I definitely think that those are applicable to plutonic rocks.

Nevertheless as advised above, don't forget that all of them have been calibrated for a given composition or composition range, and should not be extended to other systems.

Being familiar with gabbroic systems, I would also advice to use those following thermometers and oxybarometers (for redox conditions estimates):

*2 pyroxenes thermometer from Andersen et al., (1993)

*Amphibole-Plagioclase thermometer from Holland and Blundy (1994)

*The Ti-in amphibole thermometer from Ernst and Liu (1998)

*The 2-oxides (ilmenite+Ti-Magnetite) thermometer and oxybarometer of Sauerzapt et al. (2008). For this one, be careful as oxides are easily re-equilibrated at lower temperature. The redox estimate you will get will be to relate to the temperature you get (and thus maybe not to the redox conditions at the magmatic stage)

*The FeO in Cpx-Pl couples oxybarometer of France et al., (2010) (needs a rough estimate of the whole rock composition).

...

Cheers,

Good luck!

Lydéric

references:

Ernst, W.G., and J. Liu (1998), Experimental phase-equilibrium

study of Al- and Ti-contents of calcic amphibole in

MORB—A semiquantitative thermobarometer, Am. Mineral.,

83, 952–969.

Andersen, D. J., D. H. Lindsley, and P. M. Davidson (1993),

QUILF: A Pascal program to assess equilibria among

Fe-Mg-Mn-Ti oxides, pyroxenes, olivine, and quartz, Comput.

Geosci., 19, 1333–1350, doi:10.1016/0098–3004(93)

90033-2.

France, L., Ildefonse, B., Koepke, J., Bech, F., 2010. A new method to estimate the oxidation

state of basaltic series from microprobe analyses. Journal of Volcanology and Geothermal

Research 189, 340–346. http://dx.doi.org/10.1016/j.jvolgeores.2009.11.023.

Sauerzapf, U., D. Lattard, M. Burchard, and R. Engelmann

(2008), The titanomagnetite-ilmenite equilibrium: New experimental

data and thermo-oxybarometric application to the

crystallization of basic to intermediate rocks, J. Petrol., 49,

doi:10.1093/petrology/egn021.

Holland, T. J. B., and J. Blundy (1994), Non-ideal interactions

in calcic amphiboles and their bearing on amphiboleplagioclase

thermometry, Contrib. Mineral. Petrol., 116,

433–447, doi:10.1007/BF00310910.

Additionally to all recommended above, try to use a hornblende geobarometer of Ridolphi et al.(2009). Shurely, it was constrained for volcanic hornblende, but the pressure estimations for gabbroic rocks may also be valid (at least, for hornblende compositions showing maximal titatium contents).

Contrib Mineral Petrol

DOI 10.1007/s00410-009-0465-7

Good luck!

Dear Gönenc

i completely agree with Dr. Lyderic France suggestion.

We worked on the geothermo-barometric calculations in gabbroic intrusives of Egypt?

We used some of the followings:

Being familiar with gabbroic systems, I would also advice to use those following thermometers and oxybarometers (for redox conditions estimates):

*2 pyroxenes thermometer from Andersen et al., (1993)

*Amphibole-Plagioclase thermometer from Holland and Blundy (1994)

*The Ti-in amphibole thermometer from Ernst and Liu (1998)

*The 2-oxides (ilmenite+Ti-Magnetite) thermometer and oxybarometer of Sauerzapt et al. (2008).

i send you some diagrams used to calculate geothermobarometry for these gabbros published in:

Abdel-Karim, A.M., El-Awady, A. A., Helmy, H., Al-Afandy, A.H. and Abdalla, Sh. (2011): Younger Gabbros from Egypt: a transition from tholeiitic to alkaline basaltic magma and from arc to within plate rifting regime. The 6th Environmental Conference, Faculty of Science, Zagazig University, Zagazig, 194-220.

@ Dear  Putirka, thanks for your kind replay. I'll check your Fresno site and also the paper again, i think it would solve one of the key problems with my intrusion's primary intrusive conditions. If i have get some doubts about my data again, i 'll definitely ask to you : )  thank you very much again

@ Dear  Ergardo, thanks for  sharing your thesis, it looks quiet thorough

@ Dear Lyderic, thank you very much too you also for your comprehensive reply. I think that these papers will quiet helpful to differentiate the different episodes of the cooling phase of my intrusion

@ Dear Abdel-Aal thanks for your reply too, i'll be happy to see your work

@Boris, i used Ridolfi 2009 and 2012 in couples times but i think it gives different barometric estimates comparing with the holland-blundy 1994; (significantly higher i guess) ; there are couple of papers discuss the applicability of the amphibole thermobarometer;

Kiss, B., Harangi, S., Ntaflos, T., Mason, P. R., & Pál-Molnár, E. 2014. Amphibole perspective to unravel pre-eruptive processes and conditions in volcanic plumbing systems beneath intermediate arc volcanoes: a case study from Ciomadul volcano (SE Carpathians). Contributions to Mineralogy and Petrology, 167(3), 1-27.

Erdmann, S., Martel, C., Pichavant, M., Kushnir, A. 2014. Amphibole as an archivist of magmatic crystallization conditions: problems, potential, and implications for inferring magma storage prior to the paroxysmal 2010 eruption of Mount Merapi, Indonesia. Contributions to Mineralogy and Petrology, 167(6), 1-23.

recently i saw the Mr.Putirka's new work about amphibole thermobarometer

http://www.minsocam.org/msa/ammin/AM_Preprints/5506PutirkaPreprintApr.pdf

and also Molina et al., 2015's work on Calcic amphiboles

http://www.sciencedirect.com/science/article/pii/S0024493715002364

i think these works also worth to check.

but as far as i understood; barometer estimates for amphibole seems like a compilicated task

again, happy new year to all and thanks again for kindly sharing your experience

I've been reading the comments, and I think everyone here has offered a lot of really good advice. There is no better way to check a barometer than with another barometer.  I think that if you try all of the various models suggested here you may find a subset that give consistent answers - and in such a case, that may be your best bet for crystallization/equilibration conditions. Good luck.     

-Keith