General Information
Abstract: During 1977, Archer, Cathro and Associates Limited noted a number of conformable or paraconformable sills, at least 30 cm thick, of locally vesicular porphyritic augite-hornblende-biotite lamprophyre. Potassium argon analyses of biotite and hornblende indicate a concordant Upper Eocene age. Rubidium strontium isotopic data indicates a 87 Sr/86 Sr ratio of 0.7066. The calculated initial ratio, using a 40.3 Ma age, is 0.7065. This initial ratio is not unreasonable for alkalic igneous rocks in anorogenic settings.
Authors: Godwin, C., Harakal, J., Carne, R., and Mortensen, J.
Map Scale: 1 : 0
NTS Mapsheet(s): 105F07
Citation: Godwin, C., Harakal, J., Carne, R., and Mortensen, J., 1979. Geochronometric study of a Tertiary lamprophyre, MacMillan Pass, Yukon Territory. In: Mineral Industry Report 1977, J.A. Morin, M. Marchand, D.B. Craig, and R.L. Debicki (eds), Indian and Northern Affairs Canada, Northern Affairs Program, Yukon, Geology Section, p. 27.
Downloads
| Name | Comment | |
|---|---|---|
| Report | File is 5.66 MB | Download PDF |
Location Map
NTS Mapsheet(s): 105F07
Related Occurrences
| Name | Number | Type | Status |
|---|
Related Compilations
| Compilation Name | Feature Type | Update Frequency |
|---|
Related Publications
| Number | Relationship | Authors | Title |
|---|---|---|---|
| MIR1977 | Contained By | Morin, J.A., Marchand, M., Craig, D.B. and Debicki, D.L. | Mineral Industry Report 1977 |
