Franke, Daniel; Ehrmann, Werner (2009): Clay mineral distribution in sediment core AND-2A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.729023, Supplement to: Franke, D; Ehrmann, W (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, https://doi.org/10.1016/j.palaeo.2009.12.003
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Abstract:
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. Interval III (225–0 mbsf, 15.0–0 Ma, containing major hiatuses) shows a distinctly enhanced volcanic influence and sediment components that come from the south of McMurdo Sound. The AND-2A clay mineral assemblages indicate persistent physical weathering conditions and do not mirror the Mid-Miocene Climatic Optimum. They indicate that the climatic changes were probably not strong enough to cause a modification in the weathering regime on the Antarctic continent.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -77.758141 * Longitude: 165.276765
Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00
Minimum DEPTH, sediment/rock: 21.40 m * Maximum DEPTH, sediment/rock: 1004.88 m
Event(s):
AND-2A * Latitude: -77.758141 * Longitude: 165.276765 * Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00 * Elevation: -380.0 m * Recovery: 1138.54 m * Location: McMurdo Sound * Campaign: SMS (Southern McMurdo Sound) * Basis: McMurdo Station * Method/Device: Drilling/drill rig (DRILL) * Comment: Coring site is located ~25 km from the United States' McMurdo Station and from New Zealand's Scott Base on a 8.5 m thick floating sea-ice platform.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Smectite | Sme | % | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 3 | Illite | Ill | % | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 4 | Chlorite | Chl | % | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 5 | Kaolinite | Kln | % | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 6 | Smectite crystallinity | Sme cryst | d2Theta | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 7 | Illite 5Å/10Å Esquevin-index | Ill EI | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | ||
| 8 | Illite crystallinity | Ill cryst | d2Theta | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | |
| 9 | Quartz/Clay ratio | Qz/Clay | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | normalized | |
| 10 | Zeolite | Zeo | Franke, Daniel | X-ray diffraction TEXTUR, clay fraction | occurrence: + strong basal reflections at 3.96 Å and 3.90 Å, (+) weak basal reflections at 3.96 Å and 3.90 Å |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1434 data points