Transient slab flattening beneath Colombia
Abstract Subduction of the Nazca and Caribbean Plates beneath northwestern Colombia is seen in two distinct Wadati Benioff Zones, one associated with a flat slab to the north and one associated with normal subduction south of 5.5°N. The normal subduction region is characterized by an active arc, whe...
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| Format: | Article |
| Language: | English |
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Wiley
2017-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL073981 |
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| author | L. S. Wagner J. S. Jaramillo L. F. Ramírez‐Hoyos G. Monsalve A. Cardona T. W. Becker |
| author_facet | L. S. Wagner J. S. Jaramillo L. F. Ramírez‐Hoyos G. Monsalve A. Cardona T. W. Becker |
| author_sort | L. S. Wagner |
| collection | DOAJ |
| description | Abstract Subduction of the Nazca and Caribbean Plates beneath northwestern Colombia is seen in two distinct Wadati Benioff Zones, one associated with a flat slab to the north and one associated with normal subduction south of 5.5°N. The normal subduction region is characterized by an active arc, whereas the flat slab region has no known Holocene volcanism. We analyze volcanic patterns over the past 14 Ma to show that in the mid‐Miocene a continuous arc extended up to 7°N, indicating normal subduction of the Nazca Plate all along Colombia's Pacific margin. However, by ~6 Ma, we find a complete cessation of this arc north of 3°N, indicating the presence of a far more laterally extensive flat slab than at present. Volcanism did not resume between 3°N and 6°N until after 4 Ma, consistent with lateral tearing and resteepening of the southern portion of the Colombian flat slab at that time. |
| format | Article |
| id | doaj-art-474ebbae65d24935841fcf1462c08dbf |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-474ebbae65d24935841fcf1462c08dbf2025-08-20T03:49:46ZengWileyGeophysical Research Letters0094-82761944-80072017-07-0144136616662310.1002/2017GL073981Transient slab flattening beneath ColombiaL. S. Wagner0J. S. Jaramillo1L. F. Ramírez‐Hoyos2G. Monsalve3A. Cardona4T. W. Becker5Department of Terrestrial Magnetism Carnegie Institution for Science Washington District of Columbia USADepartamento de Geociencias y Medio Ambiente Universidad Nacional de Colombia Medellin ColombiaDepartamento de Geociencias y Medio Ambiente Universidad Nacional de Colombia Medellin ColombiaDepartamento de Geociencias y Medio Ambiente Universidad Nacional de Colombia Medellin ColombiaDepartamento de Procesos y Energía Universidad Nacional de Colombia Medellin ColombiaInstitute for Geophysics and Department of Geological Sciences, Jackson School of Geosciences University of Texas at Austin Austin Texas USAAbstract Subduction of the Nazca and Caribbean Plates beneath northwestern Colombia is seen in two distinct Wadati Benioff Zones, one associated with a flat slab to the north and one associated with normal subduction south of 5.5°N. The normal subduction region is characterized by an active arc, whereas the flat slab region has no known Holocene volcanism. We analyze volcanic patterns over the past 14 Ma to show that in the mid‐Miocene a continuous arc extended up to 7°N, indicating normal subduction of the Nazca Plate all along Colombia's Pacific margin. However, by ~6 Ma, we find a complete cessation of this arc north of 3°N, indicating the presence of a far more laterally extensive flat slab than at present. Volcanism did not resume between 3°N and 6°N until after 4 Ma, consistent with lateral tearing and resteepening of the southern portion of the Colombian flat slab at that time.https://doi.org/10.1002/2017GL073981Colombiaflat slabvolcanism |
| spellingShingle | L. S. Wagner J. S. Jaramillo L. F. Ramírez‐Hoyos G. Monsalve A. Cardona T. W. Becker Transient slab flattening beneath Colombia Geophysical Research Letters Colombia flat slab volcanism |
| title | Transient slab flattening beneath Colombia |
| title_full | Transient slab flattening beneath Colombia |
| title_fullStr | Transient slab flattening beneath Colombia |
| title_full_unstemmed | Transient slab flattening beneath Colombia |
| title_short | Transient slab flattening beneath Colombia |
| title_sort | transient slab flattening beneath colombia |
| topic | Colombia flat slab volcanism |
| url | https://doi.org/10.1002/2017GL073981 |
| work_keys_str_mv | AT lswagner transientslabflatteningbeneathcolombia AT jsjaramillo transientslabflatteningbeneathcolombia AT lframirezhoyos transientslabflatteningbeneathcolombia AT gmonsalve transientslabflatteningbeneathcolombia AT acardona transientslabflatteningbeneathcolombia AT twbecker transientslabflatteningbeneathcolombia |