Unnamed Occurrence (ARDF - MF056; west mouth of Rendu Inlet), Hoonah-Angoon Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MF056; west mouth of Rendu Inlet)	- not defined -
Hoonah-Angoon Census Area	Census Area
Alaska	State
USA	Country

Paleozoic marble invaded by granitic plutons of Cretaceous age. The area is in Glacier Bay National Park and Preserve.
Location: The occurrence is near sea level at the west mouth of Rendu Inlet 0.45 miles northeast of VABM Rendu. It is about 1.5 miles north of the point between Rendu Inlet and Glacier Bay. The location is probably accurate within 0.1 mile. The location is number 38 of MacKevett and others (1971), number 33 0f Cobb (1972), and number 43 of Kimball and others (1978).
Geology: Iron-stained pyritic zones up to 20 feet long and 1 foot thick occur in bleached marble of the Paleozoic marble and hornfels unit of Brew and others (1978). The unit is probably correlative with post-Silurian pre-Triassic limestone of Seitz (1959). The bedded rocks are intruded by granitic rocks of Cretaceous age. A pyritic zone containing minor chalcopyrite and possibly pyrrhotite was sampled by MacKevett and others (1971, table 9). A selected sample from a thin pyrite-rich lens contained 1500 ppm copper, 700 ppm cobalt, and 1000 ppm nickel, suggesting the prescence of nickeliferous pyrrhotite as an additional phase.
Workings: Surface exposures only, 2 samples collected (MacKevett and others, 1971).
Age: Cretaceous or younger.
Alteration: Bleaching of marble near sulfidized zones.

Commodities (Major) - Cu; (Minor) - Co, Ni
Development Status: No

Other Databases

Link to USGS - Alaska:	MF056

Other Regions, Features and Areas containing this locality

References