Table 1. Radiometric age constraints on Neoproterozoic glacial events | ||||||||||
Region (succession) |
Paleocontinent |
Age (Ma) |
Glaciation |
Age (Ma) |
Glaciation |
Age (Ma) |
Glaciation |
Age (Ma) |
Glaciation |
Age (Ma) |
1. N Norway (Verstertana) |
Baltica |
560+ |
Mortensnes |
Smalfjord |
630* |
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2. NE Svalbard (Hecla Hoek) |
Laurentia |
Wilsonbreen |
Eldobreen |
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3. SW Scotland (Dalradian) |
Laurentia |
Loch na Cille |
601±4 |
Port Askaig |
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4. US Appalachians (Blue Ridge) |
Laurentia |
570 |
700-730 |
Konnarock |
742±2 |
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5. New England, USA (Boston) |
Avalon |
570 |
Squantum |
595±2 |
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6. Newfoundland (Conception) |
Avalaon |
565±3 |
Gaskiers |
604+4/-3 |
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7. Mauritania (Jbéliat) |
West Africa |
595* |
Jbéliat |
630* |
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8. Oman (Huqf) |
Arabia |
Shuram |
Gubrah |
723+16/-10 |
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9. NW China (Quruqtagh) |
Tarim |
Hankalchoug |
Tereeken |
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10. South China (Sinian) |
South China |
Nantao |
Jiankou |
748±12 |
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11. South Australia (Adelaide) Aus-Maws |
Aus-Maws |
Elatina |
Sturtian |
777±7 |
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12. NW Australia (Kimberley) |
Aus-Maws |
Egan |
Landrigan |
Walsh |
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13. SW Namibia (Gariep) |
Kalahari |
Numees |
Walsh |
741±6 |
**Kaigas |
772±5 |
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14. NW Namibia (Otavi) |
Congo |
Ghaub |
Chuos |
746±2 |
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15. SW USA (Death Valley) |
Laurentia |
Rainstorm |
Wildrose |
Surprise |
16. NW Canada (Windermere) |
Laurentia |
Ice Brook |
Rapitan |
755±18 |
778±2 |
All ages U-Pb zircon, except Rb-Sr fine-mica ages (*). For primary sources see: 1. Gorokhov et al. (2001); 2. Harland (1997); 3. Dempster et al. (2002); 4. Evans (2000); 5. Thompson and Bowring (2000); 6. Myrow and Kaufman (1999); 7. Clauer and Deynoux (1987); 8. Brasier et al. (2000); 9. Norin (1937); 10. Evans et al. (2000); 11. Walter et al. (2000); 12. Grey and Corkeron (1998), Li (2000); 13. Frimmel (in press) [**McMillan (1968) would place Kaigas post-741±6 Ma]; 14. Hoffman et al. (1996); 15. Corsetti and Kaufman (submitted); 16. Narbonne and Aitken (1995). Correlation of glaciations by column is rather arbitrary due to meager radiometric age constraints. Glacials in bold type are discussed in text. |