November 17, 2011

Earth's 'Time Capsules' May Be Flawed

Sid Perkins, Science Now

Wikimedia Commons

Found in rocks throughout Earth's crust, zircons are some of the oldest bits of mineral on Earth. These tiny crystals are so durable—and some are so ancient, dating to just 150 million years or so after our world formed—that geologists have long viewed the tiny bits of minerals embedded within them as a kind of time capsule, offering a peek at conditions on the early Earth. But a new study suggests that these so-called inclusions are not as pristine as scientists thought, raising doubts about conclusions that researchers have drawn from them, from the rise of early oceans to the movements of the ancient continents.

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TAGGED: Radiometric Dating, Zircons, Geology


October 14, 2013
New Ideas on How Earth's Core Formed
Simon Redfern, BBC News
Experiments on samples of iron and rock held at immense pressures have led to new ideas of how Earth's core formed.Scientists from Stanford University have shown that iron metal will flow through rocks 1,000km beneath our... more ››