40Ar/39Ar thermochronology of the fossil LL6-chondrite from the Morokweng crater, South Africa

Geochimica et Cosmochimica Acta

Volumn 74, Issue 5, 2010, Pages 1734-1747

  Jourdan, F ^a   Andreoli, M A G ^b,c   McDonald, I ^d   Maier, W D ^e  

^a CURTIN UNIVERSITY   (Australia)

^b NECSA   (South Africa)

^c UNIVERSITY OF THE WITWATERSRAND   (South Africa)

^d CARDIFF UNIVERSITY   (United Kingdom)

^e UNIVERSITY OF OULU   (Finland)

Author keywords

[No Author keywords available]

Indexed keywords

ARGON-ARGON DATING; ASTEROID; CHONDRITE; CRATER; DIFFUSION; IMPACT STRUCTURE; METEORITE; THERMOCHRONOLOGY;

SOUTH AFRICA;

EID: 75149151490     PISSN: 00167037     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.gca.2009.11.032     Document Type: Article

References (59)

1. Andreoli M. A. G., Ashwal L. D., Hart R. J. and Huizenga J. M. (1999) A Ni- and PGE-enriched quartz norite impact melt complex in the Late Jurassic Morokweng impact structure, South Africa. In Large Meteorite Impacts and Planetary Evolution II (eds. B. O. Dressler and V. L. Sharpton). Boulder, Colorado. Geol. Soc. Spec. Paper, vol. 339. pp. 91-108.
2. Andreoli M. A. G., Hart R. J., Cooper G. R. J. and Webb S. J. (2008) The Morokweng impact crater, south Africa: a complex, multiring structure with a ∼130 km external radius and asymmetric radial sectors. LPI Large Meteorite Impacts Planet. Evol. IV. Abstract 3048.
3. 4He. Earth Planet. Sci. Lett. 216 (2003) 619-634
4. Bogard D.D. Impact ages of meteorites: a synthesis. Meteoritics 30 (1995) 244-268
5. 40Ar ages and thermal histories of meteorite parent bodies. Meteorit. Planet. Sci. 37 Suppl. (2002) A20
6. Cassata W.S., Renne P.R., and Shuster D.L. Argon diffusion in plagioclase and implications for thermochronometry: a case study from the Bushveld Complex, South Africa. Geochim. Cosmochim. Acta. 73 (2009) 6600-6612
7. Chen M., and El Goresy A. The nature of maskelynite in shocked meteorites: not diaplectic glass but a glass quenched from shock-induced dense melt at high pressures. Earth Planet. Sci. Lett. 179 (2000) 489-502
8. Comer B., Reimold W.U., Brandt D., and Koeberl C. Morokweng impact structure, Northwest Province, South Africa: geophysical imaging and some preliminary shock petrographic studies. Earth Planet. Sci. Lett. 146 (1997) 351-364
9. 40Ar evidence for early impact events on the LL parent body. Geochim. Cosmochim. Acta 68 (2004) 3779-3790
10. 81Kr-Kr exposure ages. Geochim. Cosmochim. Acta 52 (1988) 1649-1662
11. Eugster O., and Michel Th. Common asteroid breakup events of eucrites, diogenites, and howardites and cosmic-ray production rates for noble gases in achondrites. Geochim. Cosmochim. Acta 59 (1995) 177-199
12. 39Ar technique to plagioclase and glass from the Kirkpatrick Basalt. Antarct. Chem. Geol. 107 (1993) 173-190
13. Gradstein F. M., Ogg J. G., Smith A. G., et al. (2004) A geological time Scale 2004. International Commission on Stratigraphy (ICS). Available from: .
14. Hart R.J., Andreoli M.A.G., Tredoux M., Moser D., Ashwal L.D., Eide E.A., Webb S.J., and Brandt D. Late Jurassic age for the Morokweng impact structure, southern Africa. Earth Planet. Sci. Lett. 147 (1997) 25-35
15. Hart R.J., Cloete M., McDonald I., Carlson R.W., and Andreoli M.A.G. Siderophile-rich inclusions from the Morokweng impact melt sheet, South Africa: possible fragments of a chondritic meteorite. Earth Planet. Sci. Lett. 198 (2002) 49-62
16. 39Ar isochron analysis. Geochim. Cosmochim. Acta 52 (1988) 1295-1303
17. Henkel H., Reimold W.U., and Koeberl C. Magnetic and gravity model of the Morokweng impact structure. J. Appl. Geophys. 49 (2002) 129-147
18. Hess J.C., and Lippolt H.J. Kinetics of Ar isotopes during neutron-irradiation - Ar 39 loss from minerals as a source of error in Ar-40/Ar-39 dating. Chem. Geol. 59 (1986) 223-236
19. 39 Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence for metasomatic mantle impregnation during the Kibaran orogenic cycle. Lithos 106 (2008) 351-364
20. 40Ar dating. In Proceedings, 7th Lunar Science Conference. pp. 1987-2008.
21. 39Ar dating standard using primary K-Ar standards. Geochim. Cosmochim. Acta 71 (2007) 387-402
22. 39Ar dating standard. Chem. Geol. 231 (2006) 177-189
23. 37Ar) recoil ejection during neutron irradiation of sanidine and plagioclase crystals. Geochim. Cosmochim. Acta 71 (2007) 2791-2808
24. 39Ar geochronology: evidence from the Tswaing crater (South Africa). Geochim. Cosmochim. Acta 71 (2007) 1214-1231
25. 39Ar age of the Jänisjärvi impact structure (Russia). Earth Planet. Sci. Lett. 265 (2008) 438-449
26. 39Ar ages of L and LL chondrites from Allan Hills, Antarctica: ALHA77015, 77214 and 77304. Symp. Antarct. Meteorit. 5 17 (1980) 177-188
27. Kelley S. Excess argon in K-Ar and Ar-Ar geochronology. Chem. Geol. 188 (2002) 1-22
28. Kelley S.P., and Wartho J.-A. Rapid kimberlite ascent and the significance of Ar-Ar ages in xenolith phlogopites. Science 289 (2000) 609-611
29. Koeberl C., Armstrong R.A., and Reimold W.U. Morokweng, South Africa: a large impact structure of Jurassic-Cretaceous Boundary age. Geology 25 (1997) 731-734
30. 39Ar age calculations. Comput. Geosci. 28 (2002) 605-619
31. 39Ar dating. Meteorit. Planet. Sci. 42 (2007) 113-130
32. Kring D.A., Swindle T.D., Britt D.T., and Grier J.A. Cat Mountain: a meteorite sample of impact-melted asteroid regolith. J. Geophys. Res. 101 (1996) 29353-29371
33. Kunz J., Falter M., and Jessberger E.K. Argon-40-argon-39 evidence for multiple impacts. Meteorit. Planet. Sci. 32 (1997) 647-670
34. Kyte F.T. A meteorite from the Cretaceous/Tertiary boundary. Nature 396 (1998) 237-239
35. 39Ar recoil artifacts in cloritized biotite. Geochim. Cosmochim. Acta 53 (1988) 2697-2711
36. Ludwig K. R. (2003) Using Isoplot/Ex, Version 2.01: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication, Berkeley, California, p. 47.
37. Maier W.D., Andreoli M.A.G., McDonald I., Irvine G.J., Ashwal L.D., and Prevec S. The Morokweng impact melt sheet, South Africa: a reconnaissance study with implications for Ni-Cu-PGE sulphide mineralization. Appl. Earth Sci. (Trans. Inst. Miner. Metall. B) 112 (2003) B150-B152
38. Maier W.D., Andreoli M.A.G., McDonald I., Higgins M.D., Boyce A.J., Shukolyukov A., Lugmair G.W., Ashwal L.D., Gräser P., Ripley E.M., and Hart R.J. Discovery of a 25-cm asteroid clast in the giant Morokweng impact crater, South Africa. Nature 441 (2006) 203-206
39. McDonald I., Andreoli M.A.G., Hart R.J., and Tredoux M. Platinum group elements in the Morokweng impact structure, South Africa: evidence of the impact of a large ordinary chondrite projectile at the Jurassic-Cretaceous boundary. Geochim. Cosmochim. Acta 65 (2001) 299-309
40. 39Ar Method (1999), Oxford University Press, Oxford 269p
41. McSween H. Meteorites and their Parent Planets (1999), Cambridge Univ. Press 310p
42. Niedermann S., and Eugster O. Noble gases in lunar anorthositic rocks 60018 and 65315 - acquisition of terrestrial krypton and xenon indicating an irreversible adsorption process. Geochim. Cosmochim. Acta 56 (1992) 493-509
43. 2 speciation and diffusion model. Geochim. Cosmochim. Acta 68 (2004) 5127-5138
44. Onorato P.I.K., Uhlmann D.R., and Simonds C.H. The Thermal history of the Manicouagan impact melt sheet, Quebec. J. Geophys. Res. 83 (1978) 2789-2798
45. 39Ar dating of mica-bearing pyrite from thermally overprinted Archean gold deposits. Geology 34 (2006) 397-400
46. Pierazzo E., and Melosh H.J. Hydrocode modelling of oblique impacts: the fate of the projectile. Meteorit. Planet. Sci. 35 (2000) 117-130
47. Potter R. W. K., Collins G. S., Elbeshausen D. and Wünnemann K. (2009) The effect of asteroid shape, velocity and target material on asteroid survivability. In 40th Lunar and Planetary Science Conference. CD-ROM #1610 (abstr.).
48. Raup D.M., and Sepkoski Jr. J.J. Periodic extinction of families and genera. Science 231 (1986) 833-836
49. 39Ar dating; a discussion. Earth Planet. Sci. Lett. 41 (1978) 233-244
50. 40Ar transport scale and mechanism in high-pressure phentites: a case study from an eclogitised metabasite of the Dora-Maira nappe, western Alps. Geochim. Cosmochim. Acta 60 (1996) 1075-1090
51. Schmitz B., Peucker-Ehrenbrink B., Lindström M., and Tassinari M. Accretion rates of meteorites and cosmic dust in the Early Ordovician. Science 278 (1997) 88-90
52. Steiger R.H., and Jäger E. Subcommission on geochronology: convention of the use of decay constants in geo- and cosmo-chronology. Earth Planet. Sci. Lett. 36 (1977) 359-362
53. Swindle T. D., Kring D. A., Olson E. K. and Isachsen C. E. (2006) Ar-Ar dating of schock-melted ordinary chondrites: chronology of asteroidal impacts. In 37th Lunar and Planetary Science Conference. CD-ROM #1454 (abstr.).
54. Tera F., Papanastassiou D.A., and Wasserburg G.J. Isotopic evidence for a terminal lunar cataclysm. Earth Planet. Sci. Lett. 22 (1974) 1-21
55. Trieloff M., Jessberger E.K., and Oehm J. Ar-Ar ages of LL chondrites. Meteoritics 24 (1989) 332
56. Turner G. Potassium-argon chronology of the Moon. Phys. Chem. Earth 10 (1977) 145-195
57. 39Ar ages and cosmic ray exposure ages of Apollo 14 samples. Earth Planet. Sci. Lett. 12 (1971) 19-35
58. Weisberg M.K., Smith C., Benedix G., Folco L., Righter K., Zipfel J., Yamaguchi A., and Chennaoui Aoudjehane H. The meteoritical bulletin, no. 95. Meteorit. Planet. Sci. 44 3 (2009) 1-33
59. Wieler R. Cosmic-ray-produced noble gases in meteorites. Rev. Miner. Geochem. 47 (2002) 125-170