Description
This data release presents zircon U-Pb LA-ICP-MS geochronology from igneous rocks exposed in a coastal exposure at Ursus Head, Iliamna C-2 Quadrangle. Sills and dikes exposed in a coastal exposure at Ursus Head are deformed within the Bruin Bay fault zone. Common dikes intruding late Triassic Kamishak Formation strata composing the hanging-wall of the Bruin Bay fault are cut by numerous small-scale, low-angle, bedding-parallel, and high angle contractional faults. Sample 09MAW006A collected from one of many dikes deformed in the fault zone produced a uni-modal distribution of zircon ages of with a weighted mean of 206.92 +/-0.96 (2 sigma, n=47) and an MSWD of 1.1. Sample 09BG020C collected from a sill of more mafic composition yielded few zircons and produced only eight ages with a weighted mean of 212.49 +/-2.28 (2 sigma) and an MSWD of 3.42. The accompanying report also presents 40Ar/39Ar geochronology results from rocks collected roughly 7 km southwest of Contact Point, Iliamna B-3 Quadrangle.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| ASCII tabular files | Unknown | CSDGM IMPORT ERROR: No digtinfo/formcont | Open resource |
| Web Resource | Unknown | Open resource |
Tags
- 40ar/39ar
- age dates
- analyses
- analyses and sampling
- analytical lab results
- analytical results
- ar-ar
- bedrock
- bedrock geology
- bruin bay fault
- cenozoic
- contact point
- cook inlet
- cook inlet basin
- eocene
- fault displacement
- geochronology
- geologic
- geology
- igneous
- iliamna quadrangle
- isotopes
- lab methods
- lead
- mesozoic
- methods
- naknek
- oligocene
- plagioclase
- rocks
- sample location
- stratigraphy
- structural geology
- structure
- tectonics
- triassic
- u-pb
- uranium
- ursus head
- volcanic
- volcanic rocks
- zircon