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handle: 10261/371911
[EN] The Caribbean-Colombian Plateau (or CLIP), among other LIPs, has classically been regarded as the principal cause of the late Cenomanian/Turonian Boundary climatic Event (CTBE ~94 Ma), or Oceanic Anoxic event 2 (OAE2). However, the main CLIP phase (92–87 Ma) is too young to have significantly contributed to the climate crisis of the CTBE. Radiolarian biochronological work of the last two decades allows us to correlate radiolarian-bearing sediments interbedded with or directly overlying basalts and intrusives of the CLIP with well-calibrated pelagic sections of the Coniacian–Santonian (OAE3, 89.8 – 83.6 Ma) in the Mediterranean region. Red and black, organic-rich radiolarites dated as Coniacian-Santonian are interbedded with and/or directly overlying basalts of the CLIP phase (Ar/Ar ages of 92-83 Ma) of the Nicoya Complex (Costa Rica) and in the Azuero Plateau (Panama). Radiolarian-dated volcano-pelagic, often organic-rich strata directly overlie CLIP-related basalts in the Manzanillo Terrane (S-Nicoya Peninsula) and in the Tireo Group (Dominican Republic). While the presence of organic matter is restricted to areas of high paleofertility, the Coniacian-Santonian is recognised by us as a period of hot paleoclimate resulting in globally enhanced terrestrial chemical weathering and punctuated silica sequestration in sediments, because of volcanism of the CLIP and other LIPs.
[ES] El vulcanismo del Plateau Oceánico Caribeño-Colombiano (o CLIP), ha sido considerado como la causa principal del evento paleoclimático del límite Cenomaniense/Turoniense (CTBE~94 Ma), o Evento Anóxico Oceánico 2 (OAE2). Sin embargo, la fase principal del CLIP es más joven (92-87 Ma) y no contribuyo significativamente a la crisis climática del CTBE. El trabajo biocronológico mediante radiolarios de las últimas décadas nos permite una correlación directa entre los sedimentos asociados a los basaltos del CLIP, con secciones pelágicas bien calibradas del Coniaciense-Santoniense (C-S, OAE3, 89,8-83,6 Ma) de la región mediterránea. Radiolaritas negras datadas del C-S son interestratificadas o suprayacentes a los basaltos de la fase principal del CLIP (edades 40Ar/39Ar de 92-83 Ma) en el Complejo de Nicoya (Costa Rica) y en el Plateau de Azuero (CLIP en Panamá). Sedimentos vulcano-pelágicos, con materia orgánica (OAE3), descansan sobre los basaltos del Terreno de Manzanillo (CLIP al sur de Nicoya) y en el Grupo Tireo (República Dominicana). Mientras la presencia de materia orgánica es limitada a zonas de alta paleofertilidad, el C-S es una época de paleoclima global cálido que favoreció la alteración química terrestre y el secuestro sedimentario periódico de sílice, como consecuencia del vulcanismo CLIP y de otras largas provincias ígneas.
Esta investigación fue financiada por los proyectos SNF (Suiza) No.ß 200021_185067/2, y SNF 200020-162670.
Presentado en el XI Congreso Geológico de España (Ávila, 2-6 de julio 2024).
Peer reviewed
Correlación CLIP-OAE3, Coniaciense-Santoniense, Correlation CLIP-OAE3, Coniacian-Santonian, América Central, Radiolarians, Radiolarios
Correlación CLIP-OAE3, Coniaciense-Santoniense, Correlation CLIP-OAE3, Coniacian-Santonian, América Central, Radiolarians, Radiolarios
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