A recent phase of accretion along the southern Costa Rican subduction zone
12 pages, 9 figures
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| Format: | artículo biblioteca |
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Elsevier
2016-06
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| Subjects: | Subduction accretion, Tectonic erosion, Costa Rican subduction zone, 3D seismic imaging, Accretionary wedge deformation, |
| Online Access: | http://hdl.handle.net/10261/133324 http://dx.doi.org/10.13039/100000001 |
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dig-icm-es-10261-1333242020-03-04T02:00:31Z A recent phase of accretion along the southern Costa Rican subduction zone Bangs, Nathan L. McIntosh, Kirk D. Silver, Eli A. Kluesner, Jared W. Ranero, César R. National Science Foundation (US) Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation 12 pages, 9 figures In 2011 we acquired a 3D seismic reflection volume across the Costa Rica margin NW of the Osa Peninsula to investigate the complex structure and the development of the seismogenic zone within the Costa Rican subduction zone in the vicinity of recent International Ocean Drilling Program (IODP) drilling. In contrast to previous interpretations, these newly acquired seismic images show that the margin wedge is composed of a layered fabric that is consistent with clastic sediments, similar to materials recovered from IODP drilling, that have been thrust and thickened into thrust-bounded folded sequences. These structures are consistent with a balanced sequence that has been frontally accreted in the context of an accretionary model. We interpret these sequences as sediment originally deposited on the subducting crust in a trench basin created by the southward migration of the Cocos-Nazca-Caribbean triple junction, and accreted during recent margin subduction that also accelerated with passage of the triple junction. The margin is composed of relatively rapidly accreted sediment that was added to the margin during a phase of accretion within the last ~5 Ma that was probably preceded throughout the Neogene by periods of non-accretion or erosion This work was supported by National Science Foundation Grant numbers 1435386 and 0851380 Peer Reviewed 2016-06-10T11:47:25Z 2016-06-10T11:47:25Z 2016-06 2016-06-10T11:47:25Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.epsl.2016.03.008 issn: 0012-821X Earth and Planetary Science Letters 443: 204-215 (2016) http://hdl.handle.net/10261/133324 10.1016/j.epsl.2016.03.008 http://dx.doi.org/10.13039/100000001 https://dx.doi.org/10.1016/j.epsl.2016.03.008 Sí open Elsevier |
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Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation |
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Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation Bangs, Nathan L. McIntosh, Kirk D. Silver, Eli A. Kluesner, Jared W. Ranero, César R. A recent phase of accretion along the southern Costa Rican subduction zone |
| description |
12 pages, 9 figures |
| author2 |
National Science Foundation (US) |
| author_facet |
National Science Foundation (US) Bangs, Nathan L. McIntosh, Kirk D. Silver, Eli A. Kluesner, Jared W. Ranero, César R. |
| format |
artículo |
| topic_facet |
Subduction accretion Tectonic erosion Costa Rican subduction zone 3D seismic imaging Accretionary wedge deformation |
| author |
Bangs, Nathan L. McIntosh, Kirk D. Silver, Eli A. Kluesner, Jared W. Ranero, César R. |
| author_sort |
Bangs, Nathan L. |
| title |
A recent phase of accretion along the southern Costa Rican subduction zone |
| title_short |
A recent phase of accretion along the southern Costa Rican subduction zone |
| title_full |
A recent phase of accretion along the southern Costa Rican subduction zone |
| title_fullStr |
A recent phase of accretion along the southern Costa Rican subduction zone |
| title_full_unstemmed |
A recent phase of accretion along the southern Costa Rican subduction zone |
| title_sort |
recent phase of accretion along the southern costa rican subduction zone |
| publisher |
Elsevier |
| publishDate |
2016-06 |
| url |
http://hdl.handle.net/10261/133324 http://dx.doi.org/10.13039/100000001 |
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