Dinoflagellate cysts counts of sediment core MD95-2042

• Main Author: Eynaud, Frédérique
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: Alexandrium excavatum; Ataxiodinium choane; Bitectatodinium tepikiense; Brigantedinium; CALYPSO; Calypso Corer; Counting; dinoflagellate cysts; DEPTH; sediment/rock; Dinoflagellate cyst indeterminata; Dinoflagellate cyst per volume; Dinoflagellate cyst reworked per volume; Dinoflagellate cyst varia; Foraminifera; linings per volume; IMAGES; IMAGES I; Impagidinium aculeatum; Impagidinium pallidum; Impagidinium paradoxum; Impagidinium patulum; Impagidinium sp.; Impagidinium sphaericum; Impagidinium strialatum; International Marine Global Change Study; Islandinium minutum; Lingulodinium machaerophorum; Marge Ibérique; Marion Dufresne (1995); MD101; MD952042; MD95-2042; Multispinula quanta; Nematosphaeropsis labyrinthus; Operculodinium centrocarpum; Operculodinium israelianum; Operculodinium israelianum short; Operculodinium janduchenei; Pediastrum sp.; Pentapharsodinium dalei; Peridinoid type; Polykrikos schwarzii; Polysphaeridium zoharyi; Protoperidinium nudum; Pyxidinopsis reticulata; Selenopemphix nephroides; Spiniferites belerius; Spiniferites bentori; Spiniferites bulloideus; Ice Sheet
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.94417; https://doi.org/10.1594/PANGAEA.94417

Dinoflagellate cysts were analysed from IMAGES core MD952042 (37°48?N; 10°01?W) retrieved from the Tagus Abyssal Plain. Previous results of stable isotope and magnetic susceptibility measurements as well as of planktonic foraminiferal temperature reconstruction from this core, suggest the occurrence of “Heinrich-like events” (i.e. large ice-sheet decay) during Marine Isotopic Stage 5 (MIS 5). Dinoflagellate assemblages of this time period have revealed six dinocyst events that are characterised by peaks in Bitectatodinium tepikiense percentages. These events occur synchronously with “Heinrich-like events” previously identified. They are coeval with major retreats of the forest on land, indicating, therefore, drastic changes in the regional climate. However, results from the Ice-Rafted Detritus (IRD) analysis of the >150 ?m lithic fraction shows that MIS 5 of MD952042 has only recorded one significant input of iceberg discharge, located at the MIS 6/MIS 5 transition. It seems therefore that it is the only event that could be called a “true Heinrich event”.