Unnamed Occurrence (ARDF - MH280; on ridge between Chistochina Glacier and the glacier near the head of West Fork Chistochina River), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 10' 23'' North , 144° 57' 10'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201304
Long-form identifier:
mindat:1:2:201304:9
GUID (UUID V4):
7fbc52c3-7162-43bf-83f9-6b06b685b5a2
Location: The occurrence is about 2.5 miles north of the confluence of the Chistochina River and the West Fork Chistochina Rivers at an elevation of about 5,600 feet. It is in the NW1/4 section 19, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 11 on figure 2 of Rose (1967) and locality 3 on figure 6 of Cobb (1979 [OFR 79-238]). The location is probably accurate to within 0.1 mile.
Geology: The rocks at the site consist of andesite to dacite agglomerate, flows, and tuff of the Chisna Formation of Pennsylvanian to Permian (?) age (Rose, 1967). The volcanic rocks probably correlate with Tetelna Volcanics of Pennsylvanian age or Slana Spur Formation of Pennsylvanian to Permian age (Richter and Dutro, 1975). Specular hematite and hematite with quartz and some magnetite occur in float and in a banded-hematite outcrop exposed for about 15 feet. The float occurrences are scattered along a north-trending zone about 300 feet long. The deposit appears to be a replacement of the volcanic rocks (Rose, 1967). It is on the west flank of the same Mesozoic quartz monzonite dike as occurrences MH279 and MH281.
Workings: Geologic mapping.
Age: Possibly related to Pennsylvanian to Permian volcanic rocks or the Mesozoic quartz monzonite.
Alteration: Replacement of intermediate volcanic rocks by quartz, hematite, and magnetite.
Commodities (Major) - Fe
Development Status: No
Deposit Model: Possibly Fe skarn (Cox and Singer, 1986; model 18d).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Detailed Mineral List:
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS - Alaska: | MH280 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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References
