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| Formato: | Artículo científico |
| Lenguaje: | es |
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Universidad de Costa Rica
2012
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| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=45437354002 |
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- PEPERITAS EN COSTA RICA Daniel Soto Guillermo E. Alvarado Geología Peperites Costa Rica criptodomes hydroclastic breccias volcanism and sedimentation This paper describes petrographically and genetically, a number of peperites, as examples of spatial and temporal coexistence of magmatism and sedimentation in Costa Rica. The cases are presented in basic igne-ous complexes (ophiolites), mixtures varying from incomplete (megablocks of radiolarite with diabase in the Nicoya Complex) to complete mixes in various stages of Maastrichtian-Paleocene (Golfi to Formation) or Paleocene pelagic limestones with basalts (Quepos Subcomplex or Tulín Formation) to form brechoid and pillowed peperites. Within the Oligo-Miocene arc, there are examples extended along the Talamanca range and its foothills, as well as Sarapiquí’s plains represented for brechoid and bulbous (fl uidal) peperites in latiandesitic lavas (Pacacua Formation) or brechoid peperitic pipes in ignimbrites (Mata de Limón Member) or possible brechoid peperites in lavas in the Crucitas min-ing prospect (Cureña Formation), or simple brechoid peperites in andesitic fl ow (Pacacua Formation, in Talamanca) or as hydroclastic breccias with fragments of dacitic composition in lava fl ow deposits of Carbonal Guanacaste, just between the beaches Cabuyal and Naranjo. All these rocks represented proximal equivalents of the explosive, effusive and subvolcanic volcanism (endogenous domes and criptodomes) and his concomitance with the fl uvial sedimentation. In Quaternary period, we have a sample in the base of Tiribí Formation in contact with Palmares Lacustrine. Also this paper included possible and potential cases. It hopes that the description and interpretation of this type of rocks helps to its identifi cation in other regions of Costa Rica and Central America in general, as well as a potential source for the exploration of valuable metals. 2012 artículo científico 0256-7024 https://www.redalyc.org/articulo.oa?id=45437354002 es 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.47