Epidote Glacier Occurrence, Tok Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Epidote Glacier Occurrence	Occurrence
Tok Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Large calc-silicate alteration assemblage indicative of possible skarn or massive sulfide hydrothermal systems.
Location: The Epidote Glacier occurrence is in the middle of the moraine-littered glacier surface of the informally named Epidote Glacier. It is at an elevation of about 4,800 feet in the SW1/4 section 27, T. 17 N., R. 5 E., Copper River Meridian. The location is accurate.
Geology: This occurrence consists of extensive float of altered calc-silicate rocks that litters the moraine and surface of the informally named Epidote Glacier (Dashevsky and others, 2003). The epidote-rich rocks are scattered over an area of more than 2 square miles (S.S. Dashevsky, written communication, 2002). The Hayes Glacier unit that hosts this occurrence consists of fine-grained phyllitic schists and mylonite derived from sedimentary and volcanic protoliths. The rocks locally display intense structural deformation due to their proximity to the Denali Fault. The rocks are metamorphosed to lower greenschist facies and are less metamporphosed than Jarvis Belt rocks to the northeast. The basal part of the unit consists of mafic to intermediate composition metavolcanic rocks overlain by interbedded felsic metavolcanic units and extensive pelitic and graphitic metasedimentary rocks (Dashevsky and others, 2003).
Workings: Only limited surface sampling has been done at this prospect.
Age: Devonian to Mississippian, on the basis of the age of the host rocks.
Alteration: Extensive epidote alteration of schist scattered over an area of more than 2 square miles of glacial moraine (S.S. Dashevsky, written communication, 2002).
Development Status: None

Other Databases

Link to USGS - Alaska:	MH318

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References