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Wednesday, April 26, 2017

Found the oldest part of earth’s crust


Canadian and American geophysicists have discovered the ancient site of the lithosphere on the surface of the Earth. A study published in the journal Science.

The oldest near-surface section of the lithosphere is in the territory of the Canadian shield, which occupies the Northern half of the North American platform (including Greenland). Discovered her samples contain components, whose age is estimated at 4.2 billion years. This means that they formed after 200 million years after the birth of the Earth.

To such conclusions scientists came after the Dating of the isotopes of samarium and neodymium in granitic rocks, found in the Canadian shield.

The samples, according to the authors, represent fragments of one of the oldest parts of the lithosphere, preserved since its formation. These materials should help to clarify the history of ancient Earth.
source

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