Synthetic fluid inclusions in natural quartz I. Compositional types synthesized and applications to experimental geochemistry

Mathematics – Logic

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Scientific paper

Synthetic fluid inclusions having a wide range of geologically applicable compositions in the C-O-H-S-Na-K-Ca-Cl-Cu-Fe system have been formed by healing fractures in inclusion-free natural quartz and by precipitating new quartz overgrowths on an original "seed" crystal. Inclusion types synthesized include: 1. (1) liquid-rich, pure H 2 O inclusions of primary and secondary origin, 2. (2) pure H 2 O inclusions with the critical density, 3. (3) liquid-rich inclusions containing undersaturated aqueous solutions of NaCl or KCl or CaCl 2 , or mixtures of the three salts, 4. (4) H 2 O-NaCl inclusions containing halite daughter minerals, 5. (5) H 2 O-NaCl-KCl inclusions containing halite and sylvite daughter minerals, 6. (6) H 2 O-CO 2 inclusions of various compositions containing liquid H 2 O and either CO 2 vapor or CO 2 liquid, or both, at 25°C, 7. (7) H 2 O-CO 2 -NaCl inclusions containing an aqueous phase, liquid and vapor CO 2 , and halite at 25°C, 8. (8) C-O-H inclusions containing liquid H 2 O, a CO 2 -CH 4 liquid phase and graphite daughter minerals at 25°C, 9. (9) H 2 O-NaCl inclusions that contain a chalcopyrite daughter mineral, and 10. (10)inclusions representing trapping of the coexisting, immiscible fluids in the H 2 O-NaCl, H 2 O-CO 2 -NaCl, and Na-C-O-H systems. The inclusions exhibit uniform phase ratios at room temperature, and the temperatures of various phase changes within individual inclusions agree with those predicted from experimental and theoretical data, indicating that the inclusion fluid has the same composition and density as the parent solution. These &;miniature autoclaves' thus may be used to study various problems related to fluid inclusion research, to calibrate analytical equipment used to study natural inclusions, and to study phase equilibria, solubility and PVT relations of a variety of chemical systems.

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