교육데이터 활용•지원 서비스

Fieldwork in the northwest corner of Pool Creek map area (NTS 95C/5) during the summer of 2000 distinguished North and South areas with distinct stratigraphies and deformation histories. The South area is underlain mainly by siliciclastic sedimentary rocks (1100 m total thickness in three units) of uncertain age (Proterozoic?). North area stratigraphy (1800 m total thickness in seven units) ranges in age from Ordovician to Mississippian and consists of an interbedded succession of carbonates,sandstones, siltstones,and shales.Major shale units in the succession are correlated with Road River and Earn groups. Strata in both areas have been intruded by a north-trending, unfoliated, Eocene (?) syenite. The syenite has a thin contact metamorphic aureole consisting of skarn, gossan, and biotite hornfels. Deformation in the South area is characterized by broad, northeast-trending, subhorizontal folds, which are likely coeval with syenite intrusion. Units in the North area are deformed into tight, overturned, north-plunging, east-verging folds with a well developed, axial planar, slaty cleavage in the hinge zones. North area deformation probably predates syenite intrusion. Our fieldwork confirmed previously reported U-Th-REE prospects associated with the syenite and favourable stratigraphy for sedimentary-exhalative targets in the North area.