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USGS CMG InfoBank: Ophiolites

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Comment: 11:09 - 11:47 (00:38)
Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior
Keywords: ophiolite, "continental crust", mantle, "oceanic crust", "Scott Bogue"

Our transcription: Ophiolites are of special interest to geologists because they are the easiest way to see into the Earth's mantle.
The crust of the oceans is much thinner than the crust on the continents.
On a continent you have to be seeing 60 to 70 kilometers deep in order to get to mantle; whereas, under the ocean floor, the mantle lies three to four to five kilometers below the top of the oceanic crust.
So ophiolites when they are exposed, as this one is, are a chance for geologists to peek down three, four kilometers deep in the Earth and actually be looking at the mantle.

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Page Last Modified: Thu Oct 31 04:25:22 PDT 2013  (chd)