Publication Date:
2015-04-11
Description:
Uranium-lead geochronology in detrital zircons and provenance analyses in eight boreholes and two surface stratigraphic sections in the northern Andes provide insight into the time of closure of the Central American Seaway. The timing of this closure has been correlated with Plio-Pleistocene global oceanographic, atmospheric, and biotic events. We found that a uniquely Panamanian Eocene detrital zircon fingerprint is pronounced in middle Miocene fluvial and shallow marine strata cropping out in the northern Andes but is absent in underlying lower Miocene and Oligocene strata. We contend that this fingerprint demonstrates a fluvial connection, and therefore the absence of an intervening seaway, between the Panama arc and South America in middle Miocene times; the Central American Seaway had vanished by that time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montes, C -- Cardona, A -- Jaramillo, C -- Pardo, A -- Silva, J C -- Valencia, V -- Ayala, C -- Perez-Angel, L C -- Rodriguez-Parra, L A -- Ramirez, V -- Nino, H -- New York, N.Y. -- Science. 2015 Apr 10;348(6231):226-9. doi: 10.1126/science.aaa2815.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universidad de los Andes, Bogota, Colombia. cmontes@uniandes.edu.co. ; Universidad Nacional de Colombia, Medellin, Colombia. ; Smithsonian Tropical Research Institute, Ciudad de Panama, Panama. ; Universidad de Caldas, Manizales, Colombia. ; University of Houston, Houston, TX 77004, USA. ; Washington State University, Pullman, WA 99164, USA. ; Corporacion Geologica Ares, Bogota, Colombia. ; Universidad de los Andes, Bogota, Colombia. ; Ecopetrol, Bogota, Colombia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25859042" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
