Questions tagged [plate-tectonics]

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8 votes
1 answer
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How and when was it realized that ophiolites represented pieces of ocean crust?

Ophiolites are distinctive sequences of rock, typically capped by sediments followed by basic rocks (pillow lavas, sheeted dykes, and gabbro) followed by ultramafics (eg. dunite). Although the exact ...
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20 votes
1 answer
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Why was the continental drift theory of Alfred Wegener so controversial in the first part of the 20th century?

I frequently hear and read that Wegener's theory was very controversial at the time it was suggested. Why was this so? Was it due to Wegener himself, to evidence that was erroneously interpreted at ...
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