2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 312-3
Presentation Time: 9:30 AM

REE, NB, MO-BEARING PEGMATITES FROM THE KIN PROPERTY, NEAR REVELSTOKE, BC


CAUDLE, Dana J.1, GROAT, Lee A.2, CEMPÍREK, Jan3 and MILLONIG, Leo J.2, (1)Earth, Ocean, Atmospheric Sciences, University of British Columbia, 2020 - 2207 Main Mall, Vancouver, BC V6T 1Z4, Canada, (2)Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada, (3)Earth and Ocean Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada

Deformed REE, Nb, Mo-bearing pegmatites were discovered on the Trident and KIN properties ca. 95 kilometers northeast of Revelstoke. The two properties contain deformed sills of garnet-ilmenite bearing nepheline syenite (Trident property) to quartz syenite (KIN property) sills and pegmatites of the Trident Creek alkaline complex, as well as non-foliated quartz-feldspar-tourmaline ‘alaskite’ granite sills and pegmatites.

The granite and syenite sills, as well as the pegmatites intrude into intercalated garnet±kyanite bearing gneiss and quartzite of the Upper Proterozoic Horsethief Creek Group. Zircon dating reveals that the syenites intruded the host rock at 378 Ma and were overprinted by a metamorphic event around 60 Ma.

The REE-, Mo-bearing pegmatites at KIN property are mainly composed of quartz, feldspar, biotite, amphibole, pyroxene, and garnet; they locally contain elevated quantities of accessory minerals, mainly fluorapatite, allanite-(Ce), epidote, monazite-(Ce), zircon, Nb,Al-rich titanite, molybdenite, Nb-rich rutile, ferrocolumbite and nioboaeschynite-(Y). Allanite and nioboaeschynite can form crystals up to several cm in length. Other REE,Nb,Th-bearing minerals present include: fersmite, pyrochlore, euxenite-(Y), thorite and chevkinite. The metamorphic overprint caused partial breakdown of monazite and formation of coronas formed by allanite and apatite.

Both the syenites and pegmatites at the KIN property are enriched in REE, Mo, and Nb; the rock samples from previous exploration provided high average values of TREE (10074 ppm), Nb (2684 ppm), and Mo (2832 ppm).

The granitic pegmatites and aplites present in the eastern part of the KIN property are not deformed, and composed mainly of quartz, albite, muscovite; locally they are enriched in monazite, zircon, garnet (Alm>>Sps,Py), ferrocolumbite, euxenite-(Y), and pyrochlore. It is not clear whether they represent the most fractionated members related to the syenite intrusion or they are related to the younger granite intrusion.

Session No. 312

T185. Pegmatites I Have Known and Loved (Posters)
Wednesday, 22 October 2014: 9:00 AM-6:30 PM
Exhibition Hall C (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.751
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