Clay mineral distribution in sediment core AND-2A ...

• Main Authors: Franke, Daniel, Ehrmann, Werner
• Format: Dataset
• Language: English
• Published: PANGAEA 2009
• Subjects: DEPTH, sediment/rock; Smectite; Illite; Chlorite; Kaolinite; Smectite crystallinity; Illite 5Å/10Å Esquevin-index; Illite crystallinity; Quartz/Clay ratio; Zeolite; Drilling/drill rig; X-ray diffraction TEXTUR, clay fraction; SMS; McMurdo Station; Antarctic Geological Drilling ANDRILL; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; McMurdo Sound; Ross Sea; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.729023; https://doi.pangaea.de/10.1594/PANGAEA.729023

Clay mineral assemblages in sediments from ANDRILL drill core AND-2A were used to reconstruct the Neogene palaeoenvironment. For the first time a clay mineral data set can be presented for southern McMurdo Sound, Ross Sea, Antarctica, that covers an expanded and fairly continuous Lower and Middle Miocene section. Although the occurrence of some authigenic smectites, zeolites and opal-CT documents diagenetic processes, the clay mineral assemblages allow a subdivision of the core into three intervals that reflect changes in provenance and volcanic activity. Interval I (1000–440 mbsf, 20.0–16.5 Ma) is characterised by a dominant sediment source in the Transantarctic Mountains. Frequent and short-term changes in the illite and smectite concentrations were caused by the influx of volcanic sediment components from southern McMurdo Sound and by diagenesis. Interval II (440–225 mbsf, 16.5–15.0 Ma) has much more uniform illite and smectite contents. The assemblage is derived from the Transantarctic Mountains. ... : Supplement to: Franke, Daniel; Ehrmann, Werner (2010): Neogene clay mineral assemblages in the AND-2A drill core (McMurdo Sound, Antarctica) and their implications for environmental change. Palaeogeography, Palaeoclimatology, Palaeoecology, 286, 55-65 ...