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Thermodynamic Properties of Zoisite, Clinozoisite and Epidote

Section of Experimental Geochemistry and Mineral Physics GeoForschungsZentrum Telegrafenberg 14473 Potsdam, Germany

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
The natural occurrence of epidote minerals is widespread over a large variety of geological settings. Thus epidote minerals are part of numerous phase equilibria, which need to be evaluated to understand the geological processes in general. There are two principal approaches to evaluate phase equilibria in the deep earth. The first uses direct experimental investigations, while the second is by thermodynamic calculations and modeling. Performing and evaluating experiments is often a tedious procedure and by far not all systems can be studied at the required physical and chemical conditions, considering all of the possible variables. Therefore experimental investigations are in many instances only case studies in simplified systems, but the thermodynamic framework provides a powerful tool to perform calculations of complex phase equilibria, if the required parameters are available. However, these two approaches are not necessarily independent, because experimental results are often used to evaluate and to calibrate physical-chemical parameters for such calculations.

Many physical-chemical textbooks treat the principles of thermodynamics, and in addition some texts (e.g., Anderson and Crerar 1993; Nordstrom and Munoz 1994) introduce its application to the geological sciences. Therefore only the fundamental equations and their relationship to the required parameters are treated here briefly.

The evaluation of phase equilibria and/or stable phase assemblages involves the calculation of the apparent chemical potential µ_i(P,T) for each component i present at the P and T of choice according to

(1)

The calculation involves the following molar standard state properties (note small letters designate molar quantities): absolute enthalpy of formation from the elements _fh_i° and third law entropy s_i° at reference conditions P_r and T_r (i.e., 0.1 MPa, 298.15 K), the heat capacity c_P°_i at constant pressure as function of temperature, and the volume v_i° as a function of temperature and pressure for each pure . . . [Full Text of this Article]

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