✦ LIBER ✦
Benthic foraminiferal distribution and sedimentary structures suggest tectonic erosion at the Costa Rica convergent plate margin
✍ Scribed by Martin Meschede; Regine Weiss; Gerhard Schmiedl; Christoph Hemleben
- Book ID
- 104463386
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 379 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0954-4879
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✦ Synopsis
ABSTRACT Distribution patterns of benthic foraminiferal faunas from ODP Leg 170 Sites 1041 and 1042 show that the Costa Rican convergent margin subsided from coastal to abyssal depth from Middle Miocene to Present. This favours the model of a margin undergoing active subduction erosion. We propose that subduction erosion leads to the removal of material from the base of the forearc wedge and, as a consequence, to progressive subsidence of the forearc. A mean subsidence rate is estimated to be approximately 0.4 mm yr^−1^.