Mineral chemistry and nd isotope geochemistry of apatite in orogenic AU-associated gabbros, Baie Verte, Newfoundland ...

• Main Author: Gümüş, Fatma
• Format: Text
• Language: English
• Published: Memorial University of Newfoundland 2024
• Subjects: Baie Verte; Newfoundland
• Online Access: https://dx.doi.org/10.48336/24nt-z289; https://research.library.mun.ca/16166/

Orogenic Au deposits on the Baie Verte Peninsula, Newfoundland Appalachians, are structurally controlled and primarily hosted by Lower Ordovician volcanic cover sequences (Snooks Arm Group) and ophiolitic rocks. Gabbro-hosted orogenic Au can be found in three locations: the Stog’er Tight (642,000 t @ 3.02 g/t Au indicated, and 53,000 t @ 5.63 g/t Au inferred resources), the Argyle (436,800 t @ 2.53 g/t Au indicated and 500 t @ 2.77 g/t Au inferred resources) deposits, and the Animal Pond prospect. All these deposits are located in the hanging wall of the Scrape thrust fault typically within 100s of meters of the surface trace of the fault. Gold mineralization in all three areas is associated with coarse-grained, pegmatoidal gabbros that are variably deformed and were metasomatically altered by orogenic Au-related hydrothermal fluids. Gold is also associated with hydrothermally modified apatite, hydrothermal zircon, monazite ((Ce,La)PO4) and xenotime (YPO4). Phosphate minerals are widely distributed ...