Genesis of emerald at Lened, NWT

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00120381" target="_blank" >RIV/00216224:14310/17:00120381 - isvavai.cz</a>
Result on the web
<a href="https://numerique.banq.qc.ca/patrimoine/details/52327/3081324?docref=gK2VAH3sH8YmdLGneE9jRw" target="_blank" >https://numerique.banq.qc.ca/patrimoine/details/52327/3081324?docref=gK2VAH3sH8YmdLGneE9jRw</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Genesis of emerald at Lened, NWT
Original language description
The sources of emerald-forming fluids and chromophores at the Lened occurrence were assessed using field relationships, Ar-Ar dating, whole rock geochemistry, stable isotopes (O, C, S), and mineral chemistry; the results clearly show that the similar to 100 Ma (Ar-Ar muscovite) Lened emerald occurrence is a Type I (igneous) emerald deposit and relates to the proximal similar to 100 Ma (Ar-Ar biotite) Lened Pluton. Stable isotope analyses suggest the veins formed from a primarily granite-derived fluid with lesser components of meteoric and shale-equilibrated fluids. Beryllium and other incompatible elements (including W, Sn, and F) concentrated in evolved magmatic fluid that exsolved during the last stages of crystallization of the Lened pluton. Local overpressuring of vein-forming fluids under a brittle carapace of early pyroxene-garnet skarn led to fracture and emplacement of quartz-calcite-beryl-scheelite-tourmaline-pyrite veins. Less than 5% of the beryl can be considered pale bluish green emerald. Vanadium concentration in the emerald averages 1563 ppm; Cr averages 75 ppm, and Sc attains concentrations of 782 ppm. The key emerald chromophore vanadium was mobilized by metasomatic breakdown of V-rich black shales (averaging 2000 ppm V) that underlie the emerald occurrence.
Czech name
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Czech description
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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