Tectonic and oceanographic control of sedimentary patterns in a small oceanic basin: Dove Basin (Scotia Sea, Antarctica)

• Published in: Basin Research
• Main Authors: Pérez, Lara F., Maldonado, Andrés, Hernández Molina, Francisco Javier, Lodolo, E., Bohoyo Muñoz, Fernando, Galindo Zaldívar, Jesús
• Format: Other/Unknown Material
• Language: English
• Published: John Wiley & Sons 2021
• Subjects: Oceanografía; Tectónica; Sedimentación; análisis cuenca; Mioceno; Plioceno; Mar de Scotia; Antártida; Antarctic; Greenland; Holloway; Pacific; Scotia Sea; Southern Ocean; The Antarctic; Weddell; Weddell Sea; Antarc*; Antarctica; Iceberg*
• Online Access: https://hdl.handle.net/20.500.12468/814; https://doi.org/10.1111/bre.12148

Dove Basin, a small oceanic domain located within the southern Scotia Sea, evidences a complex tectonic evolution linked to the development of the Scotia Arc. The basin also straddles the junction between the main Southern Ocean water masses: the Antarctic Circumpolar Current (ACC), the Southeast Pacific Deep Water (SPDW) and the Weddell Sea Deep Water (WSDW). Analysis of multichannel seismic reflection profiles, together with swath bathymetry data, reveals the main structure and sediment distribution of the basin, allowing a reconstruction of the tectonostratigraphic evolution of the basin and assessment of the main bottom water flows that influenced its depositional development. Sediment dispersed in the basin was largely influenced by gravity‐driven transport from adjacent continental margins, later modified by deep bottom currents. Sediments derived from melting icebergs and extensive ice sheets also contributed to a fraction of the basin deposits. We identify four stages in the basin evolution which – based on regional age assumptions – took place during the early Miocene, middle Miocene, late Miocene–early Pliocene and late Pliocene–Quaternary. The onsets of the ACC flow in Dove Basin during the early Miocene, the WSDW flow during the middle Miocene, and the SPDW during the late Miocene were influenced by tectonic events that facilitated the opening of new oceanic gateways in the region. The analysis of Dove Basin reveals that tectonics is a primary factor influencing its sedimentary stacking patterns, the structural development of new oceanic gateways permitting the inception of deep‐water flows that have since controlled the sedimentary processes. Geophysical Department, Geological Survey of Denmark and Greenland, Dinamarca Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, España Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, España Department of Earth Sciences, Royal Holloway University of London, Reino Unido Istituto Nazionale di ...