Stratigraphy and depositional environment of Neogene diatom-rich sediments (Bahía Inglesa Formation) at Quebrada Tiburón, northern-central Chile

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Title:Main Title: Stratigraphy and depositional environment of Neogene diatom-rich sediments (Bahía Inglesa Formation) at Quebrada Tiburón, northern-central Chile
Description:Abstract: Reduced landward moisture transport due to the cold upwelled surface waters of the Humboldt Current System (HCS) is one of the primary triggers of hyperarid conditions in the Atacama Desert. Marine sediments exposed along the coastline of northern Chile provide a unique archive of land-ocean coupling between coastal upwelling related HCS and paleoclimate in the Atacama Desert during the Neogene. Here we aim to establish a refined stratigraphic framework for the emplacement of diatom-rich deposits of the Bahía Inglesa Formation at Quebrada Tiburón (27°S). The marine sediments exposed at Quebrada Tiburón lie transgressively above the pre-Cenozoic basement. A c. 9m-thick succession of laminated diatomaceous muds is intercalated with sandy deposits. Benthic foraminiferal assemblages and test morphology reveal a shift from trochospiral and planospiral (predominantly epifaunal) to serial (infaunal) morphotypes between sands and diatomaceous muds, respectively. Together with plankton assemblages dominated by diatoms and Globigerina bulloides, the diatomaceous muds reflect a highly productive coastal upwelling regime and low oxic, eutrophic conditions at the seafloor. However, occasional layers of bioturbation within the diatomaceous succession also imply phases of relaxed upwelling conditions. The new stratigraphic framework will thus allow the assessment of Neogene upwelling behavior and variability off Chile on orbital time scales. Preliminary results based on calcareous nannoplankton, diatoms and planktonic foraminifera indicate a stratigraphic range from the upper Miocene (Messinian) to the lower Pliocene for the diatomaceous muds. Evidence from the δ18O of the benthic foraminifera Uvigerina peregrine further ties the upper part of the succession to an uppermost Zanclean age < 3.9 Ma. In a next step, the stratigraphic framework will be further improved by new data from magnetostratigraphy, Sr isotopes, and tephrochronology. This study contributes to CRC 1211 “Earth-Evolution at the dry limit”, funded by the Deutsche Forschungsgemeinschaft (DFG).
Citation Advice:Bouhdayad, F., Freire, T., Auer, G., Carballeira, R., Herwartz, D., Scheidt, S., Leicher, N., Wennrich, V., Albert, R., Gerdes, A., Petersen, J., Nielsen, S., Rivadeneira, M., and Grunert, P.: Stratigraphy and depositional environment of Neogene diatom-rich sediments (Bahía Inglesa Formation) at Quebrada Tiburón, northern-central Chile, EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-9253, https://doi.org/10.5194/egusphere-egu23-9253, 2023.
Responsible Party
Creators:Fatima Bouhdayad (Author), Tiago Menezes Freire (Author), Gerald Auer (Author), Rafael Carballeira (Author), Daniel Herwartz (Author), Stephanie Scheidt (Author), Niklas Leicher (Author), Volker Wennrich (Author), Richard Albert (Author), Axel Gerdes (Author), Jassin Petersen (Author), Sven Nielsen (Author), Marcelo M. Rivadeneira (Author), Patrick Grunert (Author)
Publisher:European Geosciences Union
Publication Year:2023
Topic
CRC1211 Topic:Dating
Related Subprojects:D2, A4, D3, C4, D7, D6
Subjects:Keywords: Dating , Geochronology, Radiogenic Isotope Geochemistry, Paleoclimate Proxies
Geogr. Information Topic:Geoscientific Information
File Details
Filename:EGU23-9253-print.pdf
Data Type:Data Paper - Conference paper
File Size:310 KB
Date:Issued: 23.04.2023
Mime Type:application/pdf
Data Format:PDF (1.5)
Language:English
Status:Completed
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Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[Creative Commons] Attribution 4.0 International (CC BY 4.0)
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Specific Information - Publication
Publication Status:Published
Review Status:Not peer reviewed
Publication Type:Event Paper
Number of Pages:1 (9253 - 9253)
Event:EGU General Assembly 2023
Event Type:Conference
Event Location:Vienna, Austria
Event Duration:23rd of April, 2023 - 28th of April, 2023
Event Website:https://www.egu23.eu/
Metadata Details
Metadata Creator:Richard Albert
Metadata Created:02.02.2024
Metadata Last Updated:02.02.2024
Subproject:D2
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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