Isotopic ages from intrusive rocks near the Stuyahok gold placer deposits, south-central Holy Cross quadrangle, Alaska: A section in Geologic studies in Alaska by the U.S. Geological Survey, 1998
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Abstract
In the Stuyahok area of the south-central Holy Cross quadrangle, Alaska, felsic to intermediate dikes and sills intrude Lower Cretaceous volcanic and volcaniclastic rocks of the Koyukuk terrane. These previously undated intrusions are the probable source of at least 933 kg (30,000 oz) of past placer gold production. Additional placer, and perhaps lode, resources are likely present at Stuyahok. New U/Pb and 40Ar/39Ar isotopic data indicate two of the dikes are early Tertiary in age (63.6+0.2 Ma and 60.4+1.1 Ma, respectively). In addition to helping constrain the age of gold mineralization, these early Tertiary ages suggest the Stuyahok dikes are part of a Late Cretaceous and early Tertiary belt of gold mineralized felsic dikes that lie in the Kuskokwim mineral belt. Also reported herein are previously unpublished conventional K-Ar ages of 69.4+2.1 Ma and 69.3+2.1 Ma for two felsic intrusions from the western edge of this mineralized belt, the Marshall–Kako Creek area, which lies about 40 km west-southwest of the Stuyahok area.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Isotopic ages from intrusive rocks near the Stuyahok gold placer deposits, south-central Holy Cross quadrangle, Alaska: A section in Geologic studies in Alaska by the U.S. Geological Survey, 1998 |
| Series title | Professional Paper |
| Series number | 1615 |
| DOI | 10.3133/70180437 |
| Year Published | 2000 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Denver, CO |
| Contributing office(s) | Alaska Science Center, Alaska Science Center Geology Minerals, Eastern Geology and Paleoclimate Science Center |
| Description | 10 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Geologic studies in Alaska by the U.S. Geological Survey, 1998 (Professional Paper 1615) |
| First page | 179 |
| Last page | 188 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Holy Cross quadrangle, Stuyahok gold placer deposits |
| Google Analytic Metrics | Metrics page |