U-Pb geochronology of devonian granites in the Meguma Terrane of Nova Scotia, Canada: Evidence for hotspot melting of a neoproterozoic source

Journal of Geology

Volumn 107, Issue 5, 1999, Pages 555-568

  Keppie, J Duncan ^b   Krogh, T E ^a,b  

^a DEPARTMENT OF NATURAL HISTORY   (Canada)

^b UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO   (Mexico)

Author keywords

[No Author keywords available]

Indexed keywords

DEVONIAN; GRANITE; HOT SPOT; MELTING; PROTOLITH; URANIUM-LEAD DATING;

CANADA;

EID: 0342980404     PISSN: 00221376     EISSN: None     Source Type: Journal    
DOI: 10.1086/314369     Document Type: Article

References (61)

1. Arndt, C. J., and Goldstein, S. L. 1987. Use and abuse of crust-formation ages. Geology 15:893-895.
2. Ayuso, R. A.; Barr, S. M.; and Longstaffe, F. J. 1996. Pb and O isotopic constraints on the source of granitic rocks from Cape Breton Island, Nova Scotia, Canada. Am. J. Sci. 296:789-817.
3. Bevier, M. L., and Barr, S. M. 1990. U-Pb age constraints on the stratigraphy and tectonic history of the Avalon Terrane, New Brunswick, Canada. J. Geol. 98:53-63.
4. Boucot, A. J. 1975. Evolution and extinction rate controls: developments in paleontology and stratigraphy (vol. 1). Elsevier Scientific, 427 p.
5. Cameron, A. E.; Smith, D. H.; and Walker, R. L. 1969. Mass spectrometry of nanogram samples of lead. Anal. Chem. 41:525-526.
6. Chatterjee, A. K., and Ham, L. J. 1991. U-Th-Pb systematics of the South Mountain Batholith, Nova Scotia. Atl. Geol. 27:149.
7. Clarke, D. B.; Chatterjee, A. K.; and Giles, P. S. 1993. Petrochemistry, tectonic history, and Sr-Nd systematics of the Liscomb Complex, Meguma lithotectonic Zone, Nova Scotia. Can. J. Earth Sci. 30: 449-464.
8. Clarke, D. B., and Halliday, A. N. 1980. Strontium isotope geology of the South Mountain batholith. Geochim. Cosmochim. Acta 44:1045-1058.
9. Clarke, D. B.; Halliday, A. N.; and Hamilton, P. J. 1988. Neodymium and strontium isotopic constraints on the origin of the peraluminous granitoids of the South Mountain Batholith, Nova Scotia, Canada. Chem. Geol. 73(1988):15-24.
10. Cliff, R. A. 1985. Isotopic dating of metamorphic belts. J. Geol. Soc. Lond. 142:97-110.
11. Cormier, R. F.; Keppie, J. D.; and Odom, A. L. 1988. U-Pb and Rb-Sr geochronology of the Wedgeport granitoid pluton, southwestern Nova Scotia. Can. J. Earth Sci. 25:255-261.
12. 39Ar mineral ages. Can. J. Earth Sci. 24: 1242-1254.
13. Davis, D. W. 1982. Optimum linear regression and error estimation applied to U-Pb data. Can. J. Earth Sci. 19: 2141-2149.
14. Doig, R.; Murphy, J. B.; and Nance, R. D. 1993. Tectonic significance of the Late Proterozoic Economy River Gneiss, Cobequid Highlands, Avalon Composite Terrane, Nova Scotia. Can. J. Earth Sci. 30: 474-479.
15. Eberz, G. W.; Clarke, D. B.; Chatterjee, A. K.; and Giles, P. S. 1991. Chemical and isotopic composition of the lower crust beneath the Meguma lithotectonic zone, Nova Scotia: evidence from granulite facies xenoliths. Contrib. Mineral. Petrol. 109:69-88.
16. 39Ar laserprobe study. M.Sc. thesis, Dalhousie University, Halifax.
17. Gebauer, D., and Grunenfelder, M. 1979. U-Th-Pb dating of minerals. In Jager, E., and Hunziker, J. C., eds. Lectures in isotope geology. Berlin, Springer, p. 101-131.
18. Ghent, E. D.; Stout, M. Z.; and Parrish, R. R. 1988. Determination of metamorphic Pressure-Temperature-Time (P-T-t) paths (vol. 14). Miner. Assoc. Can. Short Course on Heat, Metamorphism and Tectonics, p. 155-188.
19. Ham, L. J. 1988. The mineralogy, petrology, and geochemistry of the Halfway Cove - Queensport pluton, Nova Scotia, Canada. M.Sc. thesis, Dalhousie Univeristy, Halifax, 294 p.
20. 40Ar in biotite temperature, pressure and compositional effects. Geochim. Cosmochim. Acta 49:2461-2468.
21. Hill, J. D. 1991. Petrology, tectonic setting, and economic potential of Devonian peraluminous granitoid plutons in the Canso and Forest Hill areas, eastern Meguma Terrane, Nova Scotia. Geol. Surv. Can. Bull. 383. 96 p.
22. 238U. Phys. Rev. C-4:1889-1906.
23. Jager, E. 1979. Introduction to geochronology. In Jager, E., and Hunziker, J. C., eds. Lectures in isotopic geology. Berlin, Springer, p. 1-12.
24. Keen, C. E.; Kay, W. A.; Keppie, J. D.; Marillier, F.; Pe-Piper, G.; and Waldron, J. W. F. 1991. Deep seismic reflection data from the Bay of Fundy and Gulf of Maine: tectonic implications for the northern Appalachians. Can. J. Earth Sci. 28:1096-1111.
25. Kempster, R. M. F.; Clarke, D. B.; Reynolds, P. H.; and Chatterjee, A. K. 1989. Late Devonian lamprophyre dykes in the Meguma Zone of Nova Scotia. Can. J. Earth Sci. 26:611-613.
26. Keppie, J. D. 1985. The Appalachian collage. In Gee, D. G., and Sturt, B. A., eds. The Caledonide Orogen: Scandinavia and related areas. Chichester, Wiley, p. 1217-1226.
27. _. 1989. Northern Appalachian terranes and their accretionary history. Geol. Soc. Am. Spec. Pap. 230: 159-192.
28. _. 1993. Synthesis of Paleozoic deformational events and terrane accretion in the Canadian Appalachians. Geol. Rundschau 82:381-431.
29. Keppie, J. D., and Dallmeyer, R. D. 1987. Dating transcurrent terrane accretion: an example from the Meguma and Avalon Composite Terranes in the northern Appalachians. Tectonics 6:831-847.
30. 39Ar isotopic data. Can. J. Earth Sci. 32: 644-659.
31. Keppie, J. D.; Dallmeyer, R. D.; Krogh, T. E.; and Aftalion, M. 1993. Dating mineralization using several isotopic methods: an example from the South Mountain Batholith, Nova Scotia, Canada. Chem. Geol. 103:251-270.
32. Keppie, J. D.; Dallmeyer, R. D.; Krogh, T. E.; Cormier, R. F.; and Halliday, A. N. 1985. Geochronological constraints for mineralization in the easternmost Meguma Terrane, Nova Scotia. Nova Scotia Department of Mines and Energy Information Series 9, p. 39-40.
33. 39Ar hornblende ages from late Proterozoic-Cambrian plutons in the Avalon Composite Terrane, Nova Scotia, Canada. Geol. Soc. Am. Bull. 102:516-528.
34. Keppie, J. D.; Davis, D. W.; and Krogh, T. E. 1998. U-Pb geochronological constraints on Precambrian stratified units in the Avalon Composite Terrane of Nova Scotia, Canada: tectonic implications. Can. J. Earth Sci. 35:222-236.
35. Keppie, J. D., and Dostal, J. 1980. Paleozoic volcanic rocks of Nova Scotia. Va. Polytech. Inst. State Univ. Mem. 2:249-256.
36. _. 1991. Late Proterozoic tectonic model for the Avalon Terrane in Maritime Canada. Tectonics 10: 842-850.
37. Keppie, J. D.; Dostal, J.; Murphy, J. B.; and Cousens, B. L. 1997. Paleozoic within-plate volcanic rocks in Nova Scotia (Canada) reinterpreted: isotopic constraints on magmatic source and paleocontinental reconstructions. Geol. Mag. 134:425-447.
38. 39Ar dating of metamorphic and igneous rocks of the Liscomb Complex, Meguma Terrane, southern Nova Scotia, Canada. Can. J. Earth Sci. 31:1643-1653.
39. Kontak, D. J.; Smith, P. E.; Kerrich, R.; and Williams, P. F. 1990. Integrated model for Meguma Group lode gold deposits, Nova Scotia, Canada. Geology 18:238-242.
40. Krogh, T. E. 1973. A low contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations. Geochim. Cosmochim. Acta 37:485-494.
41. _. 1982. Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique. Geochim. Cosmochim. Acta 46: 637-649.
42. Krogh, T. E., and Keppie, J. D. 1990. Age of detrital zircon and titanite in the Meguma Group, southern Nova Scotia, Canada: clues to the origin of the Meguma Terrane. Tectonophysics 177:307-323.
43. Krogh, T. E.; Strong, D. F.; O'Brien, S. J.; and Papezik, V. S. 1988. Precise U-Pb zircon dates from the Avalon Terrane in Newfoundland. Can. J. Earth Sci. 25: 442-453.
44. Lane, T. E. 1976. Stratigraphy of the White Rock Formation. Marit. Sediments 12:87-106.
45. Martel, A. T.; McGregor, D. C.; and Utting, J. 1993. Stratigraphie significance of Upper Devonian and Lower Carboniferous miospores from the type area of the Horton Group, Nova Scotia. Can. J. Earth Sci. 30: 1091-1098.
46. Mezger, K.; Rawnsley, C. M.; Bohlen, S. R.; and Hanson, G. N. 1991. U-Pb garnet, sphene, monazite and rutile ages: implications for the duration of high grade metamorphism and cooling history, Adirondack Mts., New York. J. Geol. 99:415-428.
47. Murphy, J. B., and Keppie, J. D. 1998. Late Devonian palinspastic reconstruction of the Avalon-Meguma Terrane boundary: implications for terrane accretion and basin development in the Appalachian orogen. Tectonophysics 284:221-231.
48. Murphy, J. B.; Oppliger, G. L.; Brimhall, G. H., Jr.; and Hynes, A. J. 1998a. Plume-modified orogeny: an example from the western United States. Geology 26: 731-734.
49. Murphy, J. B.; Strachan, R. A.; Nance, R. D.; Parker, D. K.; and Fowler, M. B. 1998b. The neodymium isotopic character of Avalonia: a 1.0 to 1.2 Ga tectonothermal event. Geol. Assoc. Can. Abstr. 23:A-131.
50. Murphy, J. B.; van Staal, C.; and Keppie, J. D. 1999. The Middle to Late Paleozoic Acadian Orogeny in the northern Appalachians: a Laramide-style plumemodified orogeny? Geology 27:653-656.
51. Oppliger, G. L.; Murphy, J. B.; and Brimhall, G. H., Jr. 1997. Is the ancestral Yellowstone hotspot responsible for the Tertiary "Carlin" mineralization in the Great Basin of Nevada? Geology 25:627-630.
52. O'Reilly, G. A. 1988. Geology and geochemistry of the Sangster Lake and Larrys River plutons, Guysborough County, Nova Scotia. M.Sc. thesis, Dalhousie University, Halifax, 290 p.
53. Parrish, R. R. 1990. U-Pb dating of monazite and its application to geological problems. Can. J. Earth Sci. 27: 1431-1450.
54. Pe-Piper, G., and Piper, D. J. W. 1998. Geochemical evolution of Devonian-Carboniferous igneous rocks of the Magdalen basin, eastern Canada: Pb and Nd-isotopic evidence for mantle and lower crustal sources. Can. J. Earth Sci. 35:201-221.
55. 39Ar and fission track dating study of intrusive rocks. Can. J. Earth Sci. 25:1952-1065.
56. Robins, G. A. 1972. Radiogenic argon diffusion in moscovite under hydrothermal conditions. M.Sc. thesis, Brown University, Providence, R.I., 23 p.
57. Robinson, P.; Tucker, R. D.; Bradley, D.; Berry, H. N., IV; and Osberg, P. H. 1998. Paleozoic orogens in New England, USA. Geol. Fören. Förh. 120: 119-148.
58. Schenk, P. E. 1970. Regional variation in the flysch-like Meguma Group (lower Paleozoic) of Nova Scotia, compared to recent sedimentation off the Scotian shelf. Geol. Assoc. Can. Spec. Pap. 7, p. 127-163.
59. Stacey, J. S., and Kramers, J. D. 1975. Approximation of terrestrial lead isotope evolution by a two-stage model. Earth Planet. Sci. Lett. 26:207-221.
60. Tucker, R. D.; Bradley, D. C.; Ver Straeten, C. A.; Harris, A. G.; Ebert, J. R.; and McCutcheon, S. R. 1998. New U-Pb zircon ages and the duration and division of Devonian time. Earth Planet. Sci. Lett. 158:175-186.
61. Wagner, G. A.; Reimer, G. M.; and Jager, E. 1977. Cooling ages derived by apatite fission track, mica Rb-Sr and K-Ar dating: the uplift and cooling history of the Central Alps. Mem. Inst. Geol. Mineral. Univ. Padova 30. 67 p.