Experimental calibration of the phlogopite fluorimeter at 500-700 °C and 1-4 kbar, and estimated HF concentrations of fluids associated with marble: Some examples

Details Experimental calibration of the phlogopite fluorimeter at 500-700 °C and 1-4 kbar, and estimated HF concentrations of fluids associated with marble: Some examples Experimental calibration of the phlogopite fluorimeter at 500-700 °C and 1-4 kbar, and estimated HF concentrations of fluids associated with marble: Some examples

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4305a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 20, pp.4305-4315

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Scientific paper

Fluorine distribution between (OH,F)-phlogopite and hydrothermal fluid has been experimentally investigated at 500-700°C and 1-4 kbar. Initial phlogopite compositions and HF concentrations in the HF-H 2 O fluid were varied from OH-phlogopite to F-phlogopite and from 0.001 to 0.1 mol/kg of H 2 O, respectively. Compositions of both phlogopite and solution were measured after the runs. The experimental data yield the following equation for the phlogopite fluorimeter: log M T , P HF = X Mg [ log ( X F /(1 - X F )) - 1722/ T ( K ) - 0.2112] + log H 2 O , where M T , P HF is a concentration in the fluid in mol/dm 3 at temperature and pressure of interest; X Mg and X F are, respectively, the mole fractions of Mg and F in the octahedral and hydroxyl sites of phlogopite; H 2 O is a water activity in fluid expressed as H 2 O X H 2 O , where X H 2 O is a mole fraction and is a activity coefficient of water at T - P of fluid. The HF concentrations in natural fluids estimated by the fluorimeter equation range from 0.9·10 -3 to 1.4·10 -2 mol/dm 3 for phlogopite formation in marbles of different localities: Adirondack Mountains (USA), Cairo del Diablo (Central Spain), Aldan Shield and Pribaikal'ye (Russia), and southwestern Pamir Mountains (Tajikistan).

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