| Reference Type | Journal (article/letter/editorial) |
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| Title | Preliminary Rb–Sr geochronology of the Rice Lake – Beresford Lake area, southeastern Manitoba |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Turek, A. | Author |
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| Peterman, Z. E. | Author |
| Year | 1968 (December 1) | Volume | 5 |
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| Issue | 6 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e68-135Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 472140 | Long-form Identifier | mindat:1:5:472140:0 |
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| GUID | 0 |
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| Full Reference | Turek, A., Peterman, Z. E. (1968) Preliminary Rb–Sr geochronology of the Rice Lake – Beresford Lake area, southeastern Manitoba. Canadian Journal of Earth Sciences, 5 (6) 1373-1380 doi:10.1139/e68-135 |
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| Plain Text | Turek, A., Peterman, Z. E. (1968) Preliminary Rb–Sr geochronology of the Rice Lake – Beresford Lake area, southeastern Manitoba. Canadian Journal of Earth Sciences, 5 (6) 1373-1380 doi:10.1139/e68-135 |
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| In | (1968, December) Canadian Journal of Earth Sciences Vol. 5 (6) Canadian Science Publishing |
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| Abstract/Notes | A Rb–Sr geochronologic study of rocks of the Rice Lake – Beresford Lake area, southeastern Manitoba, shows that gold-quartz veins containing sericite and fuchsite were emplaced at 2720 ± 185 m.y. ago (λ87Rb = 1.39 × 10−11 yr−1). The mineralization postdates, and thus provides a minimum age for, the Rice Lake Group as well as for the successively younger intrusive basic rocks, quartz diorite plutons, and the San Antonio Formation. A whole-rock isochron for the potassic granite that lies north of the greenstones indicates an age of 2550 ± 80 m.y., with an initial 87Sr/86Sr of 0.7031 ± 0.0021, which we also consider as the age of regional metamorphism. This is in agreement with a metamorphic age of 2490 ± 90 m.y., as registered by phyllites from the Rice Lake Group. The gneisses and granites that lie south of the greenstone belt are older than 2630 m.y., as determined by a cross-cutting pegmatite. Because the northern granite is younger than the gold-quartz veins, extensive prospecting of the northern granite for gold-quartz mineralization is not likely to be fruitful unless there was a still younger, but presently unrecognized, period of mineralization. |
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