Data set: Chronostratigraphic, Sedimentological and Geochemical Data

• Main Authors: Alonso, Belén, Ercilla, Gemma, Ausín, Blanca
• Other Authors: Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Alonso, Belén; Ercilla, Gemma
• Format: Dataset
• Language: English
• Published: CSIC - Instituto de Ciencias del Mar (ICM) 2023
• Subjects: Marine sediments; Chronostratigraphy; Sedimentology; Geochemical data; Coulter; Planktonic foraminifera
• Online Access: http://hdl.handle.net/10261/334516

The age-depth model for core 7 is based on four radiocarbon (14C) dates from well-preserved monospecific samples of planktonic foraminifera (Neogloboquadrina incompta or Globorotalia inflata) measured by accelerator mass spectrometry (AMS) at the Poznan Radiocarbon Laboratory (https://radiocarbon.pl/). Grain-size analysis and distribution were performed using a Coulter LS 100 laser particle size analyser on both the bulk fraction (223 samples) and noncarbonate fraction (465 samples) (http://www.ccit.ub.edu/EN/m6sm2.html). Grain-size statistical parameters were calculated using GRADISTAT software. Geochemical analysis was performed along core 7 with an Avaatech X-ray fluorescence (XRF) core scanner operated at both 10 kV and 30 kV and with a 1 cm sampling interval at Barcelona University (https://www.ub.edu/portal/web/dp-dinamica-terra-ocea/xrf-core-scanner-laboratory). The research presents for the first time a jointly analysis about the impact of the light intermediate Mediterranean (LMW) and dense deep Mediterranean (DMW) bottom currents on the sedimentation in the Alboran Sea (SW Mediterranean) and its paleoceanographic significance in response to climatic oscillations from the last glacial period to the Holocene. For that, an integration of chronostratigraphical, sedimentological, and compositional data from contourites formed by those water masses is carried out. That integration enable us to define three distinct contourite stratigraphic models. (I) The contourite terrace model, characterized by coarse-grained contourites, which is an archive of the interplay between the high-energy Atlantic Water-LMW interface and glacioeustasy from the Younger Dryas to the Holocene. (II) The contourite drift models, which are archives of rapid ocean-climate coupled fluctuations since 29.5 kyr. They comprise coarse-grained contourites formed by a relatively fast LMW and fine-grained contourites formed by a relatively weak DMW, except for the Heinrich Stadials HS3 to HS1 and YD when coarse-grained contourites were ...