Description
Geology and geochemistry of the Inmachuk River map area, Seward Peninsula, Alaska, Geologic Report 23, presents a geological overview of the Inmachuk map area, a 110-square-mile region in Alaska's northern Seward Peninsula. Fieldwork was conducted from July 13 to July 31, 1965. Mineral deposits include lead-zinc lodes and placer gold near Hannum Creek, gossan zones to the southeast, and reported placer tin in nearby creeks. Additional placer gold occurs along the Inmachuk River, just east of the mapped area. The terrain consists of tundra-covered low hills underlain by schist, phyllite, and marble. A structural dome in the southern area exposes thick marble intruded by Mesozoic(?) granite. Mineralization includes marble-hosted pyrite-lead-zinc at Ear Mountain Creek and fault-controlled gossan zones with low metal values. Soil and stream sediment anomalies near Hannum Creek suggest detrital lead transport. Weak lead and tin anomalies on the dome's flanks may indicate bedrock sources, though no surface ore was found. The complete report, geodatabase, and ESRI fonts and style files are available from the Alaska Division of Geological & Geophysical Surveys website: http://doi.org/10.14509/352.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| geodatabase | Unknown | geologic map | Open resource |
| Web Resource | Unknown | Open resource |
Tags
- american creek
- american creek granite
- asses ears granite
- basalt
- bedrock
- bedrock geology
- black butte
- collins creek
- copper
- cottonwood creek
- crossfox butte
- cunningham creek
- dolomite
- enstatite
- eureka creek
- folds
- fossils
- gems db l3 compliant
- gems db v2
- generalized
- geochemistry
- geologic
- geology
- geothermal
- gold
- granite
- hornfels
- hot springs
- igneous
- inmachuk hot springs
- intrusive
- june creek
- lead
- magnet creek
- marble
- mesozoic
- metamorphic
- mineral assessment
- mineral deposit
- mineral deposit models
- mineral exploration
- mineral localities
- mineral prospect
- mineral resources
- minerals
- mineral spring
- mining
- molybdenum
- nelson creek
- nickel
- paleozoic
- perry creek
- phyllite
- plutons
- quaternary
- replacement
- rocks
- schist
- seward peninsula
- silver
- soils
- spinel
- statistics
- stream sediments
- structure
- tertiary
- tin
- trail creek
- tremolite
- volcanic
- zinc