Unnamed Occurrence (ARDF - EA075; near O'Brien Creek), Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - EA075; near O'Brien Creek)	- not defined -
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is located along the Taylor Highway and O'Brien Creek, about 0.8 mile south of the mouth of Columbia Creek. The occurrence is in section 3, T. 5 S., R. 32 E., of the Fairbanks Meridian; the location is accurate within 1,000 feet.
Geology: The rocks near this occurrence are predominantly Paleozoic greenschist-facies black carbonaceous quartzite (Dusel-Bacon and others, 1998). Approximately three-quarters of a mile to the south, these rocks are in fault contact with Paleozoic amphibolite-facies metamorphic rocks (Foster, 1976). Sulfides occur within buff-colored, celsian (barium-silicate)-bearing quartzite. The sulfides, in decreasing order of abundance, are sphalerite, pyrite, galena, and chalcopyrite (Dusel-Bacon and others, 1998). Celsian-bearing quartzite from this site and another nearby occurrence (EA074) contain between 1.6 and 3.6 percent barium, 1.8 and 2.7 percent zinc, and 1,040 ppm and 3,980 ppm lead (Dusel-Bacon and others, 1998). This occurrence is interpreted to be a sedimentary-exhalative massive sulfide occurrence (Dusel-Bacon and others, 1998).
Age: Paleozoic or younger.

Commodities (Major) - Ba, Pb, Zn
Development Status: None
Deposit Model: Sedimentary exhalative massive sulfide (Cox and Singer, 1986; model 31a).

Other Databases

Link to USGS - Alaska:	EA075

Other Regions, Features and Areas containing this locality

References