Romero, Oscar E (2006): Valve concentration of Ethmodiscus sp. and carbon in sediment core GeoB3801-6. PANGAEA, https://doi.org/10.1594/PANGAEA.327024, Supplement to: Romero, Oscar E; Schmieder, Frank (2006): Occurrence of thick Ethmodiscus oozes associated with a terminal Mid-Pleistocene Transition event in the oligotrophic subtropical South Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology, 235(4), 321-329, https://doi.org/10.1016/j.palaeo.2005.10.026
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Within generally calcareous sediment sequences, layers of variable thickness of the giant diatom Ethmodiscus were found in five cores recovered in the Subtropical South Atlantic between 23° and 33°S from both sides of the Mid-Atlantic Ridge. Two types of oozes occur: (almost) monospecific layers of Ethmodiscus and layers dominated by Ethmodiscus, with several accompanying tropical/subtropical, oligotrophic-water diatoms. The two thickest Ethmodiscus layers occur in GeoB3801-6 around 29°S, and accumulated during late MIS 14 and MIS 12, respectively. Downcore concentrations of Ethmodiscus valves range between 3.4 10 4 and 2.3 10 7 valves g -1. We discuss the ooze formation in the context of migration of frontal systems and changes in the thermohaline circulation. The occurrence of Ethmodiscus oozes in sediments underlying the present-day pelagic, low-nutrient waters is associated with a terminal event of the Mid-Pleistocene Transition at around 530 ka, when the ocean circulation rearranged after a period of reduced NADW production.
Latitude: -29.511667 * Longitude: -8.305000
Date/Time Start: 1996-02-26T00:00:00 * Date/Time End: 1996-02-26T00:00:00
Minimum DEPTH, sediment/rock: 5.10 m * Maximum DEPTH, sediment/rock: 7.98 m
|#||Name||Short Name||Unit||Principal Investigator||Method/Device||Comment|
|2||Diatoms, total abundance per unit sediment mass||TDA/sed||106 #/g||Romero, Oscar E||Counting, diatoms||Ethmodiscus sp.|
|3||Calcium carbonate||CaCO3||%||Romero, Oscar E||Calculated, CaCO3=(TC-TOC)*8.333|
|4||Carbon, organic, total||TOC||%||Romero, Oscar E||Element analyser CHN-O Rapid, Heraeus|
120 data points