Geological setting of Cu-Fe mineralization in north-west trending shear zone of the Delaney Prospect, North-Central Newfoundland

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University of New Brunswick


The Delaney Prospect is located at the northeast end of the village of St. Patricks in the Green Bay district of Notre Dame Bay. In the early 1900's a mineralized northwest trending shear zone set in the ophiolitic volcanics of the Lushs Bight Group was mined to a depth of 23 meters with two crosscuts at the 12 to 15 meter level. A detailed mapping investigation of the shear zone and surrounding area was completed during the summer of 1983 to try and determine the source and mechanisms responsible for mineralization. Thin section and polish block work in conjunction with information derived through mapping provide the basis for this paper. Scanning electron microscope and X-ray Fluorescence analysis of samples supplied additional data. The Cu-Fe-Zn sulfide mineralization occurs as remobilized fine disseminations, lenses and fracture fillings in the shear zone. Similarly occurring and strataform type mineralization are observed to a lesser degree in the host rock. Sulfide deposition is believed to have originated by volcanic exhalative activity in a submarine oceanic environment. Later remobilization into the shear zone by way of hydrothermal solutions is attributed to deformational processes associated with the Acadian Orogeny.