The southern Central America puzzle: chronology and structure. A review
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad de Costa Rica
2009
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| _version_ | 1876480422878117888 |
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| author | Jean Tournon |
| author_facet | Jean Tournon |
| contents | The southern Central America puzzle: chronology and structure. A review Jean Tournon Hervé Bellon Geología 40 K 40 Ar ages Central America oceanic plateau basalts Santa Elena and Nicoya peninsulas From northern Costa Rica to eastern Panama oceanic rocks are extensively exposed along the Pacific margin of Isthmic Central America. For the past 30 years, their nature and significance were subject to debate. This study distinguishes numerous units using the following criterions: ages of igneous and sedimentary rocks, petrological and geochemichal features, structural setting and ages of the sedimentary “covers”. New field, radiometric and stra - tigraphical data are compared with available data published in recent papers. Strong disparities are noticed for ages, from Lias-lower Dogger to Eocene and petrological patterns: mantle peridotites, several tholeiitic and alkaline series. Various units are mélange formations made of exotic blocks unknown elsewhere. We propose that these disparate units were emplaced by two contrasting processes: 1) Closing of a Mesozoic northern oceanic basin by northward convergence and emplacement of an E-W 150 km ophiolitic suture 2) successive accretions of terranes originated in the Pacific plate and corresponding to possible oceanic plateau basalts and seamounts. 2009 artículo científico 0256-7024 https://www.redalyc.org/articulo.oa?id=45437347002 en http://www.redalyc.org/revista.oa?id=454 Revista Geológica de América Central application/pdf Universidad de Costa Rica Revista Geológica de América Central (Costa Rica) Num.40 |
| format | Artículo científico |
| id | redalyc_45437347002 |
| institution | Redalyc |
| language | en |
| publishDate | 2009 |
| publisher | Universidad de Costa Rica |
| spellingShingle | The southern Central America puzzle: chronology and structure. A review Jean Tournon Geología 40 K 40 Ar ages Central America oceanic plateau basalts Santa Elena and Nicoya peninsulas The southern Central America puzzle: chronology and structure. A review Jean Tournon Hervé Bellon Geología 40 K 40 Ar ages Central America oceanic plateau basalts Santa Elena and Nicoya peninsulas From northern Costa Rica to eastern Panama oceanic rocks are extensively exposed along the Pacific margin of Isthmic Central America. For the past 30 years, their nature and significance were subject to debate. This study distinguishes numerous units using the following criterions: ages of igneous and sedimentary rocks, petrological and geochemichal features, structural setting and ages of the sedimentary “covers”. New field, radiometric and stra - tigraphical data are compared with available data published in recent papers. Strong disparities are noticed for ages, from Lias-lower Dogger to Eocene and petrological patterns: mantle peridotites, several tholeiitic and alkaline series. Various units are mélange formations made of exotic blocks unknown elsewhere. We propose that these disparate units were emplaced by two contrasting processes: 1) Closing of a Mesozoic northern oceanic basin by northward convergence and emplacement of an E-W 150 km ophiolitic suture 2) successive accretions of terranes originated in the Pacific plate and corresponding to possible oceanic plateau basalts and seamounts. 2009 artículo científico 0256-7024 https://www.redalyc.org/articulo.oa?id=45437347002 en http://www.redalyc.org/revista.oa?id=454 Revista Geológica de América Central application/pdf Universidad de Costa Rica Revista Geológica de América Central (Costa Rica) Num.40 |
| title | The southern Central America puzzle: chronology and structure. A review |
| topic | Geología 40 K 40 Ar ages Central America oceanic plateau basalts Santa Elena and Nicoya peninsulas |
| url | https://www.redalyc.org/articulo.oa?id=45437347002 |