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发帖数: 662 | 1 August 27, 2007
Volume 85, Number 35
p. 14
Geochemistry
Earliest Diamonds Stir Up Debate
Gems in zircon grains may revise notions of early Earth events
Elizabeth Wilson
A DISCOVERY of tiny diamonds embedded in the most ancient known minerals adds a new twist to the ongoing debate over at what point, billions of years ago, the molten, nascent Earth began to cool and crust over.
Martina Menneken
Tiny needlelike diamond embedded in zircon is billions of years old.
Relic grains of hardy zirc |
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