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Sample SBC-3
NavDat sample number 15251 · SYENITE
Sample
| Sample ID | SBC-3 |
|---|
| Rock name | SYENITE |
|---|
| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | cap syenite; medium to coarse grained ?; K-feldspar, prismatic augite, occasionally replaced with sodalite and hornblende; rare biotite, magnetite, and apatite |
|---|
Location
| Latitude | 47.47 |
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| Longitude | -110.24 |
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| Location | Square Butte |
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| State / province | Montana |
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| Volcanic field | Square Butte laccolith of Central Montana Alkalic Province |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 44.5 |
|
34 |
55 |
|
|
