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USGS CMG InfoBank: Origin of Accreted Terranes

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Comment: 16:02 - 16:45 (00:43)
Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building
Keywords: "accreted terrane", fossil, continent, magnetism, "Scott Bogue"

Our transcription: To determine the ultimate origin of an accreted terrane geologists look for specific clues in the field.
The kinds of clues geologists can use are fossils, which fossils in a terrane, which would be very different from the fossils of a neighboring terrane or the neighboring continent.
The magnetism of rocks in a terrane can also be distinctive.
Geologists compare the magnetic direction recorded by rocks in an accreted terrane to the magnetic direction in rocks that formed on the continent itself.
If these directions of magnetism are very different, that's a clue that the terrane has traveled a long way to get to where it is now.

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Page Last Modified: Thu Oct 31 04:25:58 PDT 2013  (chd)