Absolute chronology of the Pliocene-Quaternary sediment sequence of the Bogota area, Colombia

Abstract

Pliocene-Quaternary chronology of the sediments of the high plain of Bogota, Eastern Cordillera, Colombia Andriessen, P.A.M.; Helmens, K.F.; Hooghiemstra, H.; Riezebos, P.A.; van der Hammen, T. Published in:Quaternary Science Reviews DOI:10.1016/0277-3791(93)90066-U Link to publicationCitation for published version (APA): Andriessen, P. A. M., Helmens, K. F., Hooghiemstra, H., Riezebos, P. A., & van der Hammen, T. (1994). Pliocene-Quaternary chronology of the sediments of the high plain of Bogota, Eastern Cordillera, Colombia. Quaternary Science Reviews, 12, 483-501. DOI: 10.1016/0277-3791(93)90066-U General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A revised geochronological framework is presented for the sequence of unconsolidated sediments present in the Bogot~i area (Eastern Cordillera, Colombia). This is based on 11 fission track dates on zircons that were obtained both from exposed ash layers and from a series of ashes from the Funza II borehole, which reached 586 m below the surface of the high plain. The 3 dates obtained from the exposed ash layers provide control for the older part of the sequence (6-2.5 Ma). The 8 dates from the Funza II core give control for the younger part of the sequence (3--0 Ma). Acceptance of these new fission track dates on volcanic zircons means that many of the tephra dates obtained from the Funza I core (that included fission track dates on glass shards and K-Ar dates using the mineral fractions in the ashes, published in 1984), are rejected. It also confirms earlier climate-stratigraphical dating.The Neogene-Quaternary sediments of the Bogotfi area span a period of at least the last 6 Ma. The fluvial-lacustrine sediment record registers major tectonic uplift of the Eastern Cordillera for the period between 5 and 3 Ma, the development of the large sedimentary basin of Bogot~i after 3.5 Ma, with an important phase of tectonic adjustment at about 1 Ma, and a long period of strong climatic fluctuations that started shortly after 2.7 Ma.

Late Pliocene-Pleistocene high resolution pollen sequence of Colombia: An overview of climatic change

“…This is based on 11 fission track datings on zircons that were obtained both from exposed ash layers and from a series of ashes from the Funza II core. The data 5.33 + 1.02 Ma, 3.67 + 0.50 Ma and 2.77 _+ 0.50 Ma (Andriessen et al, 1993) (Imbrie et al, 1984). For the lower part of the Funza II core, age estimations are based on a provisional visual correlation with the ODP Site 677 61~D record (Shackleton et aL, 1990 A challenging similarity between the climatic change, registered in Andean Colombian pollen records (Fig.…”

“…A revised geochronological framework for the sequence of unconsolidated sediments present in the Bogotat area was published recently (Andriessen et al, 1993) to replace the original time frame of the Funza I pollen record (Hooghiemstra, 1984(Hooghiemstra, , 1989. This is based on 11 fission track datings on zircons that were obtained both from exposed ash layers and from a series of ashes from the Funza II core.…”

“…1200 years. For this purpose a time frame is used, based on absolute datings (fission track datings on zircon; Andriessen et aL, 1993) in combination with correlation of the pollen record • with the ODP Site 677 5~K) record of the Eastern Pacific . This last procedure resulted in small downcore adjustments of the pollen record; in fact, the best possible corrections to compensate for changes in sediment accumulation rates.…”

“…Around 4-3 Ma, the principal upheaval of the area had ceased (van der Hammen et al, 1973;Helmens, 1990;Andriessen et al, 1993). The high plain of Bogot~ was by then an extensive lake at approximately 2500 m altitude.…”

“…27 ka and this last part of the Quaternary is missing in the Fanza records. The top samples are of Holocene age (Pollen data after Hooghiemstra, 1984Hooghiemstra, , 1989; time control afterb Andriessen et al. 1993.…”