A Rb-Sr isochron age for a kimberlite from the recently discovered Lac de Gras field, Slave Province, northwest Canada

Journal of Geology

Volumn 105, Issue 4, 1997, Pages 503-509

  Davis, W J ^a   Kjarsgaard, B A ^a  

^a GEOLOGICAL SURVEY OF CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

EOCENE; KIMBERLITE; RUBIDIUM/STRONTIUM DATING;

CANADA, NORTHWEST TERRITORIES, LAC DE GRAS;

EID: 0031458671     PISSN: 00221376     EISSN: None     Source Type: Journal    
DOI: 10.1086/515942     Document Type: Article

References (36)

1. Allsopp, H. L., and Barrett, D. R., 1975, Rb-Sr age determinations on south African kimberlite intrusions: Physics Chem. Earth, v. 9, p. 605-617.
2. _; Bristow, J. W.; Smith, C. B.; Brown, R.; Gleadow, A. J. W.; Kramers, J. D.; and Garvie, O. G., 1989, A summary of radiometric dating methods applicable to kimberlites and related rocks, in Ross, J., ed., Kimberlites and Related Rocks, Their Composition, Occurrence, Origin and Emplacement: Proc. Fourth Int. Kimberlite Conf. Vol. 1, Geol. Soc. Australia Spec. Pub. 14, p. 343-357.
3. Brown, R. B.; Allsopp, H. L.; Bristow, J. W.; and Smith, C. B., 1989, Improved precision of Rb-Sr dating of kimberlitic micas: An assessment of a leaching technique: Chem. Geol., v. 79, p. 125-136.
4. Brakhfogel, F. F., 1995, The age division of the kimberlitic and related magmatites in the NE of the Siberian platform (methods and results): Sixth Int. Kimberlite Conf. (Novosibirsk) Extd. Abs., p. 60-62.
5. Carlson, J. A.; Kirkley, M. B.; Ashley, R. M.; Moore, R. O.; and Kolebaba, M. R., 1995, Geology and exploration of kimberlites on the BHP/Dia Met claims, Lac de Gras region, Northwest Territories, Canada: Sixth Int. Kimberlite Conf. (Novosibirsk) Extd. Abs., p. 98-100.
6. Currie, K. L., 1976, The alkaline rocks of Canada: Geol. Survey Canada Bull. 239, 225 p.
7. Davis, G. L., 1977, The ages and uranium contents of zircons from kimberlites and associated rocks: Carnegie Inst. Washington Yearbook 76, p. 631-635.
8. Davis, W. J., 1997, U-Pb zircon and rutile ages from granulite xenoliths in the Slave Province: Evidence for mafic magmatism in the lower crust coincident with Proterozoic dike swarms: Geology, in press.
9. _; Gariepy, C.; and van Breemen, O., 1996, Lead isotopic composition of Late Archean granites from the Slave Province, Canada: Chem. Geol., v. 130, p. 255-269.
10. _, and Hegner, E., 1992, Neodymium isotopic evidence for the tectonic assembly of Late Archean crust in the Slave Province, northwest Canada: Contrib. Mineral. Petrol., v. 111, p. 493-504.
11. Fahrig, W. F., 1987, The tectonic setting of continental mafic dike swarms: Failed arm and early passive margin, in Halls, H. C., and Fahrig, W. F., eds., Mafic dike swarms: Geol. Assoc. Canada Spec. Paper 34, p. 331-348.
12. Fipke, C. E.; Dummett, H. T.; Moore, R. O.; Carlson, J. A.; Ashley, R. A.; Gurney, J. J.; and Kirkley, M. B., 1995, History of the discovery of diamondiferous kimberlites in the Northwest Territories, Canada: Sixth Int. Kimberlite Conf. (Novosibirsk) Extd. Abs., p. 158-160.
13. Gobba, J. M., 1989, Kimberlite exploration in Tanzania: Jour. Afr. Earth Sci., v. 9, p. 565-578.
14. Hearn, B. C., Jr., 1989, Alkalic ultramafic magmas in north-central Montana, USA: Genetic connections of alnöite, kimberlite, and carbonatite, in Ross, J., ed., Kimberlites and Related Rocks, Their Composition, Occurrence, Origin and Emplacement: Proc. Fourth Int. Kimberlite Conf., Vol. 1, Geol. Soc. Australia Spec. Pub. 14, p. 109-119.
15. Hegner, E.; Roddick, J. C.; Fortier, S. M.; and Hulbert, L., 1995, Nd, Sr, Pb, Ar, and O isotopic systematics of Sturgeon Lake kimberlite, Saskatchewan, Canada: Constraints on emplacement age, alteration, and source composition: Contrib. Mineral. Petrol., v. 120, p. 212-222.
16. Hoffman, P. F., 1989, Precambrian geology and tectonic history of North America, in Bally, A. W., and Palmer, A. R., eds., The Geology of North America, Vol. A: Boulder, CO, Geol. Soc. America, p. 447-512.
17. Isachsen, C., and Bowring, S. A., 1994, Evolution of the Slave craton: Geology, v. 22, p. 917-920.
18. Kirkley, M. B., 1994, A comparison of kimberlites on the Slave and Kalahari cratons, in Kusick, R., and Goff, S. P., complrs., Exploration Overview 1994, Northwest Territories: Dept. Indian and Northern Affairs, Yellowknife, NWT, p. 46-47.
19. Kjarsgaard, B. A., 1996u, Slave province kimberlites, NWT, in LeCheminant, A. N.; Richardson, D. G.; et al., eds., Searching for diamonds in Canada: Geol. Survey Canada Open File Rept. 3228, p. 55-60.
20. _, 1996b, Kimberlite, in LeCheminant, A. N.; Richardson, D. G.; et al., eds., Searching for diamonds in Canada: Geol. Survey Canada Open File Rept. 3228, p. 29-38.
21. _, and Heaman, L. M., 1995, Distinct emplacement periods of Phanerozoic kimberlites in North America, and implications for the Slave province, in Igboji, E. I., complr., Exploration Overview 1995, Northwest Territories: Dept. Indian and Northern Affairs, Yellowknife, NWT, p. 22-23.
22. Ludwig, K. R., 1991, Isoplot, a plotting and regression program for radiogenic-isotope data. U.S. Geol. Survey Open File Rept. 91-445.
23. Lutz, T. M., and Srogi, L., 1986, Biased isochron ages resulting from subsolidus isotope exchange: A theoretical model and results: Chem. Geol., v. 56, p. 63-71.
24. Marvin, R. F.; Hearn, B. C., Jr.; Mehnert, H. H.; Naeser, C. W.; Zartman, R. E.; and Lindsay, D. A., 1980, Late Cretaceous-Paleocene-Eocene igneous activity in north-central Montana: Isochron West, v. 29, p. 5-25.
25. Mitchell, R. H., 1986, Kimberlites: Mineralogy, Geochemistry, and Petrology: New York, Plenum, 442 p.
26. _, 1995, Kimberlites, Orangeites, and Related Rocks: New York, Plenum, 412 p.
27. Nassichuk, W. W., and McIntyre, D. J., 1995, Cretaceous and Tertiary fossils discovered in kimberlites at Lac de Gras in the Slave province, Northwest Territories: Geol. Survey Canada Current Res. 1995-B, p. 109-114.
28. Northern Miner, 1993, BHP-Dia Met age date kimberlites: Northern Miner (Toronto), v. 79, no. 29, p. 1, 2.
29. Northern Miner, 1996, NWT Diamonds clears final hurdle: Northern Miner (Toronto), v. 82, no. 37, p. 1, 6.
30. Padgham, W. A., 1990, The Slave Province, an overview: Geol. Survey Canada Open File 2168, p. 1-41.
31. Pell, J., 1995, NWT Kimberlite Database: Dept. Indian and Northern Affairs, Yellowknife, NWT, Open File EGS95-2. WB1.
32. Schulze, D. J.; Anderson, P. E. N.; Hearn, B. C., Jr.; and Hetman, C. M., 1995, Origin and significance of ilmenite megacrysts and macrocrysts from kimberlite: Int. Geol. Review, v. 37, p. 780-812.
33. Scott-Smith, B. H., 1995, Petrology and diamonds: Can. Inst. Mining Metallurgy Conf. Notes (Vancouver, October 1994), p. 1-18.
34. Smith, C. B., 1983, Pb, Sr, and Nd isotopic evidence for sources of Cretaceous kimberlite: Nature, v. 304, p. 51-54.
35. _; Clark, T. C.; Barton, E. S.; and Bristow, J. W., 1994, Emplacement ages of kimberlite occurrences in the Prieska region, southwest border of the Kaapvaal craton, South Africa: Chem. Geol., v. 113, p. 149-169.
36. Thorpe, R. I.; Cumming, G. L.; and Mortensen, J. K., 1992, A significant Pb isotopic boundary in the Slave Province and its relation to ancient basement in the Western Slave Province, in Project Summaries, Canada-Northwest Territories Mineral Development Agreement 1987-91: Geol. Survey Canada Open File 2484, p. 179-184.