Description
This data release presents 40Ar/39Ar step-heating geochronology results from rocks collected roughly 7 km southwest of Contact Point, Iliamna B-3 Quadrangle. Samples obtained from a felsic dike intruding the principal Bruin Bay fault plane near Contact Point produced biotite and plagioclase 40Ar/39Ar ages of 36.5 +/- 0.8 Ma and 31.5+/-0.7 Ma, respectively. The age dates inform stratigraphic, structural, and geochronologic studies along the western margin of lower Cook Inlet basin. The accompanying report also presents zircon U-Pb LA-ICP-MS geochronology results for dikes near Ursus Head.
Resources
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| ASCII tabular files | Unknown | CSDGM IMPORT ERROR: No digtinfo/formcont | 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
- oligocene
- plagioclase
- rocks
- sample location
- stratigraphy
- structural geology
- structure
- tectonics
- triassic
- u-pb
- uranium
- ursus head
- volcanic
- volcanic rocks
- zircon