Uranium-Lead Zircon Age Dating on the Trecesson Batholith
May 01 2014 - 8:19AM
Access Wire
Val-d'Or, Quebec / ACCESSWIRE / May 1, 2014 / Knick Exploration
Inc. (TSX-V: KNX) is pleased to report that uranium-lead (U-Pb) age
dating has been completed on the Trecesson Batholith of Knick's
Trecesson Property. The geochronology study yielded an age of
2711.0 ? 1.2 Ma interpreted to represent the timing of emplacement
of the granite. Peripheral to the Trecesson Batholith felsic
volcanics of the "Lac Arthur Group" have been U-Pb age dated at
2714 ? 3 Ma (RNFQ, RP 2010-04, Goutier J. et al., original work
Labbe 1999).
The U-Pb zircon geochronology study was performed by Jean David,
Ph.D. geo., research associate GEOTOP-UQAM as part of the Masters
studies being completed by Mr. George Yordanov BSc. at University
of Montreal. The Masters studies are on the Trecesson Pluton,
including age dating, petrographic work and relative comparisons
with the Bourlamaque Batholith. Alain Tremblay Ph.D. geo., is the
acting supervisor for Mr. Yordanovs' Thesis.
The Trecesson Batholith is host to the historical Chib-Kayrand
Mine and numerous gold ? tungsten showing most of which have been
subjected to little work since the early 1950's. The showings occur
with in and near the margins of the Batholith. Mineralization
encountered in Knicks' 2011 drill program showed similarities to
the ores from the Bourlamaque Batholith.
The age dating of the Trecesson Batholith was performed in part
to see how it compares with that of the Bourlamaque Batholith. The
Bourlamaque Batholith host to at least 9 known gold deposits in the
Val d'Or mining camp gave rise to producers and past producers
including the Ferderber and Beaufor gold mines. U-Pb age dating of
the Bourlamaque Batholith by Wong, P. C. et al. in 1991 yielded an
event date of 2,700 ? 1 Ma (U-Pb zircon and rutile chronology of
Archean greenstone formation and gold mineralization in the Val
d'Or region, Quebec; Earth and Planetary Sciences Letters, Volume
104. p. 325-336).
Analytical method used by Jean David, Ph.D. geo., research
associate GEOTOP-UQAM,
More than fifteen single crystals of the best quality were
selected (and treated by the technique of chemical abrasion to
prevent the problem of discordance mainly caused by recent 'lead
loss' (Mattinson 2005). Four fractions were analyzed by thermal
ionization mass spectrometry and isotope dilution method
(TIMS-ID).
After the chemical abrasion, between 3 and 5 small grains were
combined for each analytical fraction. The fractions were washed in
ultra-pure HNO3, H2O and acetone, and dissolved in Teflon bombs
using HF at 195 C in the presence of a mixed 205Pb/233-235U spike.
Purification of U and Pb follows the procedure of Krogh (1973),
modified by using small anion exchange columns. The samples were
loaded on zone-refined Re filaments with Si-gel and H3PO4 and
measured on a VG Sector54 mass spectrometer by peak-jumping using
the ion-counting Daly photomultiplier. Corrections for mass
fractionation ( 0.15% amu for Pb, 0.18% amu for U) and dead time
(11.5 ns) were determined by the repeated measuring of the SRM981
and SRM982 Pb standard, U-500 U standard, as well as in-situ using
the 233-235U ratio from the spike. The analyses were corrected for
a Pb blank of 2 pg and 0.5 pg for U, but for some analyses the
blank have been higher and allowance has been made for that during
data's reduction. The residual initial common Pb was subtracted
using compositions calculated with the Stacey & Kramers (1975)
model. Overall evaluation of the reproducibility was determined by
the analysis of aliquots of separate fragments of zircon standard
91500 (Wiedenbeck et al., 1995). Results from sixteen analyses
yield an age of 1066.2?0.6 Ma (MSWD = 1.1). Age determinations and
uncertainties were calculated using Isoplot3x (Ludwig 2007).
Trecesson Property References:
1) NI 43-101 Technical Report Pertaining To: Trecesson Property,
Abitibi Area, Quebec, Canada, January 20, 2012 updated on March 25,
2013, by Donald Theberge, Eng., M.B.A. available on Knick's web
site at www.knick.ca.
2) Knick press releases are available in the news room on
Knick's web site at www.knick.ca.
Gordon N. Henriksen, P.Geo., Vice President of Knick
Exploration, is the Company's qualified person as defined by
National Instrument 43-101. He has reviewed and approved the
contents of this press release.
We seek Safe Harbour.
Forward-Looking Statements
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Provider (as that term is defined in policies of the TSX Venture
Exchange) accepts responsibility for the adequacy or accuracy of
this press release.
This Press Release includes forward-looking statements that are
subject to risks and uncertainties. All statements within, other
than statements of historical fact, are to be considered forward
looking. There can be no assurances that such statements will prove
accurate and, therefore, readers are advised to rely on their own
evaluation of such uncertainties.
FOR MORE INFORMATION, CONTACT:
Jacques Brunelle
President & CEO
Knick Exploration
536, 3rd Avenue
Val-d'Or, Quebec
J9P 1S4
Office
819-874-5252
Cell
819-856-1387
Gordon N. Henriksen
Vice President
Knick Exploration
536, 3rd Avenue
Val-d'Or, Quebec
J9P 1S4
Office
819-874-5252
Cell
819-210-1406
SOURCE: Knick Exploration Inc.
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