Unnamed Occurrence (ARDF - NM029; Fox Creek), Nome Mining District, Nome Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Unnamed Occurrence (ARDF - NM029; Fox Creek) | - not defined - |
Nome Mining District | Mining District |
Nome Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
64° 57' 44'' North , 165° 6' 43'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Nome | 3,806 (2018) | 53.1km |
Mindat Locality ID:
201431
Long-form identifier:
mindat:1:2:201431:2
GUID (UUID V4):
f1209779-1bf0-4afd-aed9-62e7aa08f973
Location: This pegmatite is on the ridge crest between Gold Run and Fox Creek at an elevation of 2,750 feet. Gold Run is an east tributary to Grand Central River; Fox Creek flows south to Salmon Lake.
Geology: This pegmatite is south of the Thompson Creek orthogneiss, and its age is uncertain. Granite pegmatites are abundant in the Kigluaik Mountains, and others may be present near this occurrence. The pegmatites are noticeably radioactive; radioactivity measured on the ground with a scintillometer is as much as 500 counts per second or 3 to 5 times common background (Hawley and Associates, 1978, Section IV). Tourmaline and garnet are common accessory minerals, and the more radioactive pegmatites commonly contain smoky quartz. Beryl occurs in some of the pegmatite, including a body described by Moffit (1913, p. 25) about 1 mile west of the mouth of North Star Creek (NM046). Some granite pegmatites are within the Thompson Creek orthogneiss or appear to be spatially associated with it, particularly on its south or hanging wall side (Hummel, 1962 [MF 248]; Till, 1980). The Thompson Creek orthogneiss has been dated as latest Proterozoic (555 Ma, Amato and Wright, 1998) and some pegmatites may also be this age. However, metasedimentary rocks of the Kigluaik Mountains underwent granulite facies metamorphism and partial melting in the mid-Cretaceous, and some pegmatites are crosscutting to local structure and are mid-Cretaceous in age (Throckmorton and Hummel, 1979; Till, 1983; Miller and Hudson, 1991; Hudson, 1994; Till and Dumoulin, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). The host rocks to this pegmatite are amphibolite facies metasedimentary rocks that are derived from Precambrian or early Paleozoic protoliths (Sainsbury, 1972; Bunker and others, 1979; Till and Dumoulin, 1994). They are thought to have undergone regional high pressure metamorphism along with many other rocks of Seward Peninsula in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Patrick, 1988; Patrick and Evans, 1989; Armstrong and others, 1986; Hannula and McWilliams, 1995). Higher temperature metamorphism overprinted these rocks in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Throckmorton and Hummel, 1979; Till, 1983; Evans and Patrick, 1987; Leiberman, 1988; Patrick and Leiberman, 1988; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson and Arth, 1983; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Uplift of the higher temperature metamorphic rocks took place in the mid- to Late Cretaceous and in the Eocene (Calvert, 1992; Dumitru and others, 1995).
Workings: Reconnaissance uranium exploration including airborne radiometrics, stream sediment surveys, and ground traverses have been completed in the Kigluaik Mountains.
Age: Late Proterozoic or mid-Cretaceous; either the age of the Late Proterozoic Thompson Creek orthogneiss or mid-Cretaceous amphibolite facies metamorphism.
Commodities (Major) - Be, Th, U
Development Status: None
Deposit Model: Simple granite pegmatite with rudimentary zoning.
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
2 valid minerals.
Detailed Mineral List:
β Beryl Formula: Be3Al2(Si6O18) |
β 'Feldspar Group' |
β 'Garnet Group' Formula: X3Z2(SiO4)3 |
β Quartz Formula: SiO2 |
β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
β | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
β | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
Unclassified | |||
β | 'Feldspar Group' | - | |
β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
β | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
Be | Beryllium | |
---|---|---|
Be | β Beryl | Be3Al2(Si6O18) |
B | Boron | |
B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | Oxygen | |
O | β Beryl | Be3Al2(Si6O18) |
O | β Quartz | SiO2 |
O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | β Garnet Group | X3Z2(SiO4)3 |
Al | Aluminium | |
Al | β Beryl | Be3Al2(Si6O18) |
Si | Silicon | |
Si | β Beryl | Be3Al2(Si6O18) |
Si | β Quartz | SiO2 |
Si | β Garnet Group | X3Z2(SiO4)3 |
Other Databases
Link to USGS - Alaska: | NM029 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
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