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obduction
This term describes a specific, violent tectonic event where dense oceanic lithosphere is forced upward onto a lighter continental margin. It is the geological opposite of subduction, where the oceanic plate typically sinks beneath the continent. The term carries a connotation of structural anomaly, as it represents a rare reversal of the expected gravitational behavior of crustal materials.
In technical discourse, the word is used almost exclusively within geology and geophysics to explain the presence of ophiolites on land. Because it refers to a singular geological process or a specific event in a region's history, it is treated as an uncountable mass noun when referring to the process itself, though it can be counted when referring to distinct occurrences of the event.
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Ví dụ
The presence of ophiolites on land is a clear indicator of past obduction.
Look at this map to see where obduction occurred during the mountain building process.
Obduction is essentially the opposite of subduction.
Obduction is essentially the opposite of subduction.
I wonder if this rock layer was formed by obduction or simple accretion.
The tectonic collision led to the obduction of oceanic crust onto the continent.
We need to determine if the structural evidence supports the theory of obduction.
The mountain range was created through a complex series of obduction events.
Could obduction explain why we find mantle rocks at this altitude?