Detailed Information on Publication Record
2017
Genesis of emerald-bearing quartz veins associated with the Lened W-skarn mineralization, Northwest Territories, Canada
LAKE, D.J., L.A. GROAT, H. FALCK, T. MULJA, Jan CEMPÍREK et. al.Basic information
Original name
Genesis of emerald-bearing quartz veins associated with the Lened W-skarn mineralization, Northwest Territories, Canada
Authors
LAKE, D.J. (124 Canada), L.A. GROAT (124 Canada), H. FALCK (124 Canada), T. MULJA (124 Canada), Jan CEMPÍREK (203 Czech Republic, guarantor, belonging to the institution), D. KONTAK (124 Canada), D. MARSHALL (124 Canada), G. GIULIANI (250 France) and M. FAYEK (124 Canada)
Edition
Canadian Mineralogist, QUEBEC, CANADA, MINERALOGICAL ASSOC CANADA, 2017, 0008-4476
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10500 1.5. Earth and related environmental sciences
Country of publisher
Canada
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 0.945
RIV identification code
RIV/00216224:14310/17:00095033
Organization unit
Faculty of Science
UT WoS
000406369600004
Keywords in English
emerald; tungsten skarn; mineral chemistry; geochemistry; stable isotopes; Lened; Northwest Territories
Tags
International impact, Reviewed
Změněno: 4/4/2018 11:26, Ing. Nicole Zrilić
Abstract
V originále
Emerald at the Lened occurrence in the western Northwest Territories is hosted by quartz veins cutting skarn near the Lened granite pluton and older Selwyn Basin strata. Using field relationships, Ar-Ar dating, whole-rock geochemistry, stable isotopes (O, H, C, and B), and mineral chemistry, the sources of the emerald-forming fluids and chromophores have been assessed; the results clearly show that the ca. 100 Ma (Ar-Ar muscovite) Lened emerald occurrence is a Type I (igneous) skarn-hosted emerald deposit related to the proximal ca. 100 Ma (Ar-Ar biotite) Lened pluton. Beryllium and other incompatible elements (i.e., W, Sn, Li, B, and F) in the emerald, vein minerals, and surrounding skarn were derived during the terminal stages of crystallization of the proximal Lened pluton. Decarbonation during pyroxene-garnet skarn formation in the host carbonate rocks probably caused local overpressuring and fracturing that allowed ingress of magmatic-derived fluids and formation of quartz-calcite-beryl-scheelite-tourmaline-pyrite veins. The delta B-11 values of accessory dravite in the emerald veins averages -4.9 + 0.3 parts per thousand (1 sigma, n = 10), which is compatible with a magmatic source, and the Al-Fe-Mg composition is that of tourmaline formed in sedimentary environments, with Mg likely derived from metasomatism of local marine carbonates. The vein fluid was largely igneous in origin, but the dominant emerald chromophore V (emerald vein = avg. 1560 ppm V versus 75 ppm Cr) was mobilized by metasomatism of V-rich sedimentary rocks (avg. 2000 ppm V) that underlie the emerald occurrence.
Links
| GA17-17276S, research and development project |
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