Recent mapping of a number of raised beach ridges on the north coast of Greenland suggests that the ice cover in the Arctic Ocean was greatly reduced some 6000-7000 years ago. The Arctic Ocean may ...
since source materials were extracted from the mantle. The Nd data from both sample groups provide an average age estimate of 2.0 ±- 0.3 Ga for the Middle Proterozoic crust from which most of the Belt ...
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