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
Always quote citation above when using data! You can download the citation in several formats below.
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|
|1||DEPTH, sediment/rock||Depth sed||m||Geocode|
|2||Diatoms, total, 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