Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America: Implications for building the rock record of convergent margins
- Vannucchi, P.
- Sak, P. B.
- Morgan, J. P.
- Ohkushi, K.
- Ujiie, K.
DOIAbstract
Integrated Ocean Drilling Program (IODP) Expedition 334 to southern Costa Rica, Central America, documented unprecedented subduction erosion in an area of active seismic slip. Widespread subduction erosion of the upper plate initiated when the Cocos Ridge, an overthickened aseismic ridge, arrived at the Middle America Trench. Subduction erosion was coeval with the rapid formation of deposition centers on the forearc of the upper plate. The completely recovered shelf sequence constrains a short (<2 m.y.) interval of extreme subsidence (∼1200 m) with a rapid pulse occurring during the first ∼0.3 m.y. This event removed an estimated 1.2 × 106 km3 of forearc material at a rate of ∼1690 km3/m.y./km of trench during a time of rapid (∼1035 m/m.y.)...
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