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Rare-Earth Element- and Yttrium-Bearing Pegmatite Dikes Near Dora Bay, Southern Prince of Wales Island.

PB90200395

Publication Date	1990
Personal Author	Barker, J. C.; Mardock, C.
Page Count	48
Abstract	Yttrium and rare-earth element pegmatite dikes are associated with a peralkaline granitic and nephelene syenite complex near Dora Bay on southern Prince of Wales Island. Mineralized dikes were mapped and sampled during USBM investigations in 1987 and 1988. Coarse-grained pegmatite dikes emanating as late-stage magmatic fluids from the intrusive complex further evolve into vein-dikes and ultimately silica-rich veins. The dikes can be traced up to two miles along a north south zone. Lithophile elements exhibit a pronounced zonation in vein-dikes and veins that are distal to the Dora Bay complex with increasing values correlating with increasing distance. The pattern of mineralization suggests very late stage magmatic fluids containing the incompatible lithophile elements were injected into a preexisting north-south fracture zone. REE mineralogy exhibits fine-grained intergrowths of principally thalenite and bastnaesite with lesser monazite and eudialyte. Euxenite contains most of the columbium values and zircon is commonly associated with the dikes.
Keywords	Mineral deposits Rare earth elements Yttrium Pegmatite Site surveys Alaska Niobium Dora Bay Geological surveys Rocks Prince of Wales Island Tables(Data) Petrography Sampling Mineralization Dikes Natural resources management Multi-element analysis
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48G - Hydrology & Limnology 48B - Natural Resource Management
Corporate Authors	Bureau of Mines, Fairbanks, AK. Alaska Field Operations Center.
Document Type	Technical Report
Title Note	Open file rept. (Draft).
NTIS Issue Number	199013

Rare-Earth Element- and Yttrium-Bearing Pegmatite Dikes Near Dora Bay, Southern Prince of Wales Island.

Rare-Earth Element- and Yttrium-Bearing Pegmatite Dikes Near Dora Bay, Southern Prince of Wales Island.
PB90200395

Publication Date	1990
Personal Author	Barker, J. C.; Mardock, C.
Page Count	48
Abstract	Yttrium and rare-earth element pegmatite dikes are associated with a peralkaline granitic and nephelene syenite complex near Dora Bay on southern Prince of Wales Island. Mineralized dikes were mapped and sampled during USBM investigations in 1987 and 1988. Coarse-grained pegmatite dikes emanating as late-stage magmatic fluids from the intrusive complex further evolve into vein-dikes and ultimately silica-rich veins. The dikes can be traced up to two miles along a north south zone. Lithophile elements exhibit a pronounced zonation in vein-dikes and veins that are distal to the Dora Bay complex with increasing values correlating with increasing distance. The pattern of mineralization suggests very late stage magmatic fluids containing the incompatible lithophile elements were injected into a preexisting north-south fracture zone. REE mineralogy exhibits fine-grained intergrowths of principally thalenite and bastnaesite with lesser monazite and eudialyte. Euxenite contains most of the columbium values and zircon is commonly associated with the dikes.
Keywords	Mineral deposits Rare earth elements Yttrium Pegmatite Site surveys Alaska Niobium Dora Bay Geological surveys Rocks Prince of Wales Island Tables(Data) Petrography Sampling Mineralization Dikes Natural resources management Multi-element analysis
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48G - Hydrology & Limnology 48B - Natural Resource Management
Corporate Authors	Bureau of Mines, Fairbanks, AK. Alaska Field Operations Center.
Document Type	Technical Report
Title Note	Open file rept. (Draft).
NTIS Issue Number	199013