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Minerals 2016, 6(4), 130; https://doi.org/10.3390/min6040130

Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies

1
Department of Earth Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
2
Western Australian Museum, Locked Bag 49, Welshpool DC, WA 6986, Australia
3
Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Feely
Received: 13 November 2016 / Revised: 26 November 2016 / Accepted: 30 November 2016 / Published: 9 December 2016
(This article belongs to the Special Issue Fluid Inclusions: Study Methods, Applications and Case Histories)
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Abstract

Emerald from the deposits at Poona shows micrometre-scale chemical, optical, and cathodoluminescence zonation. This zonation, combined with fluid inclusion and isotope studies, indicates early emerald precipitation from a single-phase saline fluid of approximately 12 weight percent NaCl equivalent, over the temperature range of 335–525 °C and pressures ranging from 70 to 400 MPa. The large range in pressure and temperature likely reflects some post entrapment changes and re-equilibration of oxygen isotopes. Secondary emerald-hosted fluid inclusions indicate subsequent emerald precipitation from higher salinity fluids. Likewise, the δ18O-δD of channel fluids extracted from Poona emerald is consistent with multiple origins yielding both igneous and metamorphic signatures. The combined multiple generations of emerald precipitation, different fluid compositions, and the presence of both metamorphic and igneous fluids trapped in emerald, likely indicate a protracted history of emerald precipitation at Poona conforming to both an igneous and a metamorphic origin at various times during regional lower amphibolite to greenschist facies metamorphism over the period ~2710–2660 Ma. View Full-Text
Keywords: fluid inclusions; emerald; beryl; stable isotopes; yilgarn craton; Australia fluid inclusions; emerald; beryl; stable isotopes; yilgarn craton; Australia
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Marshall, D.; Downes, P.J.; Ellis, S.; Greene, R.; Loughrey, L.; Jones, P. Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies. Minerals 2016, 6, 130.

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