Geology Of The La Lande Lake Area Labrador Trough PDF Download

"The Seal Lake area described covers over 1,500 square miles in Central Labrador. This sedimentary basin is composed of a succession of Precambrian sediments, volcanic flows and diabase sills which have an estimated thickness of at least 30,000 feet. These rocks represent a typical geosynclinal sequence of sedimentation. Fluctuating shallow water conditions were prevalent throughout the deposition of most of the sequence, but the younger members of the succession are of terrestrial origin. The basin bas been extensively folded and overturned to the north with prominent thrust-faulting along the southern margin of the syncline. Low grade metamorphism increases slightly towards the southern thrust-faulted granite contact. More than 250 small copper occurrences have been recorded from the younger members of the Seal Lake succession but the mineralization is erratic. Low-grade niobium-thorium-rare earth deposits were discovered in the older Letitia Lake rocks to the southwest." --