Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc
The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE pat...
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| Format: | Article |
| Language: | English |
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Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
2011-11-01
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| Series: | Geologica Acta |
| Subjects: | |
| Online Access: | https://revistes.ub.edu/index.php/GEOACTA/article/view/3698 |
| _version_ | 1797654559835815936 |
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| author | M. WEBER A. CARDONA V. VALENCIA U. ALTENBERGER M. LÓPEZ MARTÍNEZ M. TOBÓN S. ZAPATA G. ZAPATA A.E. CONCHA |
| author_facet | M. WEBER A. CARDONA V. VALENCIA U. ALTENBERGER M. LÓPEZ MARTÍNEZ M. TOBÓN S. ZAPATA G. ZAPATA A.E. CONCHA |
| author_sort | M. WEBER |
| collection | DOAJ |
| description | The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE patterns, suggesting that their protoliths evolved in a subduction related tectonic setting. They show island-arc affinities and are similar to primitive islandarc rocks described in the Caribbean. The geochemical characteristics are comparable to low-grade greenschists from the nearby Etpana Terrane, which are interpreted as part of a Cretaceous intra-oceanic arc. These data support evidence that the eclogites and the Etpana terrane rocks formed from the same volcano-sedimentary sequence. Part of this sequence was accreted onto the margin and another was incorporated into the subduction channel and metamorphosed at eclogite facies conditions. 40Ar-39Ar ages of 79.2±1.1Ma and 82.2±2.5Ma determined on white micas, separated from two eclogite samples, are interpreted to be related to the cooling of the main metamorphic event. The formation of a common volcano-sedimentary protolith and subsequent metamorphism of these units record the ongoing Late Cretaceous continental subduction of the South American margin within the Caribbean intra-oceanic arc subduction zone. This gave way to an arc-continent collision between the Caribbean and the South American plates, where this sequence was exhumed after the Campanian |
| first_indexed | 2024-03-11T17:01:16Z |
| format | Article |
| id | doaj.art-635efed6a4324e289131a5f744c76c97 |
| institution | Directory Open Access Journal |
| issn | 1696-5728 |
| language | English |
| last_indexed | 2024-03-11T17:01:16Z |
| publishDate | 2011-11-01 |
| publisher | Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
| record_format | Article |
| series | Geologica Acta |
| spelling | doaj.art-635efed6a4324e289131a5f744c76c972023-10-20T07:20:51ZengUniversitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)Geologica Acta1696-57282011-11-0193-4Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arcM. WEBER0A. CARDONA1V. VALENCIA2U. ALTENBERGER3M. LÓPEZ MARTÍNEZ4M. TOBÓN5S. ZAPATA6G. ZAPATA7A.E. CONCHA8Universidad Nacional de Colombia Carrera 80 No. 65-223, Medellín, Colombia.Smithsonian Tropical Research Institute Balbóa, Ancón, Panamá. Corporación Geológica Ares. Bogotá, ColombiaDepartment of Geosciences, The University of Arizona, Gould-Simpson Building 1040 East Fourth St Tucson, Arizona, USA.Potsdam Universität. Karl-Liebknecht-Str. 24; 14476 Potsdam-Golm, Germany.Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE). Carretera Ensenada Tijuana No 3918, Zona Playitas, Ensenada, Baja California, México 22860.Universidad Nacional de Colombia Carrera 80 No. 65-223, Medellín, Colombia.Universidad Nacional de Colombia Carrera 80 No. 65-223, Medellín, Colombia.Universidad Nacional de Colombia Carrera 80 No. 65-223, Medellín, Colombia.Universidad Nacional de Colombia Carrera 80 No. 65-223, Medellín, Colombia.The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE patterns, suggesting that their protoliths evolved in a subduction related tectonic setting. They show island-arc affinities and are similar to primitive islandarc rocks described in the Caribbean. The geochemical characteristics are comparable to low-grade greenschists from the nearby Etpana Terrane, which are interpreted as part of a Cretaceous intra-oceanic arc. These data support evidence that the eclogites and the Etpana terrane rocks formed from the same volcano-sedimentary sequence. Part of this sequence was accreted onto the margin and another was incorporated into the subduction channel and metamorphosed at eclogite facies conditions. 40Ar-39Ar ages of 79.2±1.1Ma and 82.2±2.5Ma determined on white micas, separated from two eclogite samples, are interpreted to be related to the cooling of the main metamorphic event. The formation of a common volcano-sedimentary protolith and subsequent metamorphism of these units record the ongoing Late Cretaceous continental subduction of the South American margin within the Caribbean intra-oceanic arc subduction zone. This gave way to an arc-continent collision between the Caribbean and the South American plates, where this sequence was exhumed after the Campanianhttps://revistes.ub.edu/index.php/GEOACTA/article/view/3698EclogitesPrimitive island-arcGeochronologyGuajira PeninsulaColombiaCaribbean |
| spellingShingle | M. WEBER A. CARDONA V. VALENCIA U. ALTENBERGER M. LÓPEZ MARTÍNEZ M. TOBÓN S. ZAPATA G. ZAPATA A.E. CONCHA Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc Geologica Acta Eclogites Primitive island-arc Geochronology Guajira Peninsula Colombia Caribbean |
| title | Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc |
| title_full | Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc |
| title_fullStr | Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc |
| title_full_unstemmed | Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc |
| title_short | Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc |
| title_sort | geochemistry and geochronology of the guajira eclogites northern colombia evidence of a metamorphosed primitive cretaceous caribbean island arc |
| topic | Eclogites Primitive island-arc Geochronology Guajira Peninsula Colombia Caribbean |
| url | https://revistes.ub.edu/index.php/GEOACTA/article/view/3698 |
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