Sample ID: 83VPCC-12
Georef Number: 2006-058742
Reference Title: (super 40) Ar/ (super 39) Ar dates from alkaline intrusions in thenorthern Crazy Mountains, Montana; implications for the timing andduration of alkaline magmatism in the central Montana alkalicprovince
Reference Author: Harlan, Stephen S
Location
Sample Detail
Major Data? NO
Trace Data? NO
Isotope Data? NO
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Age: 48
Min Age: 46.1
Max Age: 49.9
Geological Age:
EOCENE
Age Method:
K-AR
Material: IGNEOUS
Type: PLUTONIC
Composition: INTERMEDIATE
Rock Name: SYENITE
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