How fast can metamorphic rocks be exhumed?
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Metamorphic rocks can be exhumed at rates comparable to plate tectonic speeds. The exhumation rates of ultrahigh-pressure rocks in the Neoproterozoic and modern collisional orogens have been found to be fast, with average vertical exhumation rates of 0.9 ± 0.3 cm/yr . Exhumation of high-pressure metamorphic rocks can occur with typical plate velocities of cm/year, driven by forced flow in a subduction channel . The exhumation rates of the deepest subducted Alpine rocks have been estimated to be 3.4 cm/yr and 1.6 cm/yr, indicating fast exhumation at plate tectonic speeds . The metamorphic evolution of ultrahigh-pressure garnet peridotite from Alpe Arami suggests extremely fast exhumation rates of c. 15 mm yr−1 or more . Exhumation of amphibole-eclogite facies rocks in the California Coast Ranges occurred as a single episode with fast and uniform exhumation rates up to ~140°C/Ma .
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| Papers (5) | Insight |
|---|---|
| The paper provides evidence that metamorphic rocks can be exhumed at extremely fast rates of approximately 15 mm/yr or more. | |
| The paper provides evidence that metamorphic rocks in the California Coast Ranges were exhumed at fast rates of up to ~140°C/Ma during a one-time event. | |
| The paper provides evidence that the exhumation of deeply buried metamorphic rocks can occur at rates of 3.4 cm/yr and 1.6 cm/yr, which is similar to the speed of subduction. | |
| The paper states that the maximum exhumation rate for metamorphic rocks in subduction channels is approximately 1/3 of the subduction burial rate. | |
| The paper provides evidence that the exhumation rate of ultrahigh-pressure rocks in the West Gondwana orogen was approximately 0.9 ± 0.3 cm/yr, which is considered fast. |
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