Synthetic fluid inclusions as recorders of microfracture healing and overgrowth formation rates
-
Stéphane Teinturier
and
Jacques Pironon
Abstract
Aqueous fluid inclusions have been synthesized within fluorite microfractures (T = 200°C, P = Psat, t < 30 days), quartz microfractures, and quartz overgrowths (T = 400 to 300°C, P = 400 bars, t < 20 days). The experiments were designed to determine the time necessary to form the inclusions, within a minute in a fluorite host, and within a day in a quartz host. The results permit estimation of the time needed to heal microfractures or create overgrowths, which is accomplished by measuring the melting temperature (Tm) of the inclusions in fluorite and the homogenization temperature (Th) of the inclusions in quartz.
For the fluorite experiments, the results show that fluorite/NH4Cl solution equilibrium took 82 hours. Moreover, the healing process appears to be an irregular process along the microfracture. Fluorite experiments mimic boiling processes occurring in natural hydrothermal or epithermal systems and show how a boiling fluid may be progressively salted during vaporization and trapped as fluid inclusions.
For the experiments involving quartz, the quartz/H2O-NaCl solution equilibrium was reached on the first day for synthetic quartz and on the sixth day for natural quartz. This difference is linked to the hydration state of the two types of quartz. The decrease in Th of synthetic fluid inclusions from the core-overgrowth boundary to the external part of the quartz overgrowth shows that the growth of quartz is a progressive and protracted process, which involves a silica oversaturated solution
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Melting of garnet peridotite: Effects of capsules and thermocouples, and implications for the high-pressure mantle solidus
- High-resolution and energy-filtered TEM of the interface between hematite and ilmenite exsolution lamellae: Relevance to the origin of lamellar magnetism
- The structural evolution of mercury sulfide precipitate: an XAS and XRD study
- Synthetic fluid inclusions as recorders of microfracture healing and overgrowth formation rates
- Fluid-induced nucleation of (Y+REE)-phosphate minerals within apatite: Nature and experiment. Part II. Fluorapatite
- A technique for measuring 3D crystal-size distributions of prismatic microlites in obsidian
- TEM investigation of forsterite dendrites
- Mechanism and kinetics of element and isotopic exchange mediated by a fluid phase
- Chromian spinel during melting experiments of dry peridotite (KLB-1) at 1.0–2.5 GPa
- Resonant XPS study of the pyrite valence band with implications for molecular orbital contributions
- Petrology and mineralogy of wollastonite- and melilite-bearing paralavas from the Central Apennines, Italy
- Variation of antiphase domain size in omphacite: A tool to determine the temperature–time history of eclogites revisited
- Compressional and shear wave velocities of ringwoodite γ-Mg2SiO4 to 12 GPa
- A vibrational spectroscopic study of the oxidation of pyrite by ferric iron
- The atomic arrangement of the ganophyllite-group modulated layer silicates as determined from the orthorhombic dimorph of tamaite, with the elusive 16.8 Å ganophyllite-group superstructure revealed
- The crystal structure of chromian kassite from the Saranovskoye deposit, Northern Urals, Russia
- Spectroscopic and related evidence on the coloring and constitution of New Zealand jade
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- Mn-rich tourmaline from Austria: structure, chemistry, optical spectra, and relations to synthetic solid solutions
- Compositional heterogeneity of olivine in thermally metamorphosed serpentinite from Southwest Japan
- Magnetic monitoring of hydrothermal magnetite nucleation-and-growth: Record of magnetic reversals
- High-temperature limits on viscosity of non-Arrhenian silicate melts
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