Citation:

S0954102003001640

Name: Sedimentological investigation on 4 cores from the Antarctic continental margin
Published: 2003
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Sedimentary sequences spanning early Oligocene and Neogene time intervals were recovered with piston and gravity cores along erosional structures at northern Gunnerus Ridge and Kainan Maru Seamount in the southernmost Indian Ocean. Results of sedimentological investigations help to reconstruct the Cenozoic palaeoenvironment. Main emphasis was placed on grain size and clay mineral data. The clay mineral assemblages are dominated by illite and smectite. Chlorite and kaolinite occur in trace amounts. Whereas illite has a distinct source on the East Antarctic craton, smectite is of somewhat speculative origin, but probably is derived from erosion of Cenozoic or older shelf sediments. The presence of terrigenous sand indicates that ice-rafting was active throughout the time represented by the investigated cores, although with varying intensity. During the early Oligocene interval (30.1–29.0 Ma), siliceous phytoplankton production dominated sedimentation. Environmental conditions were quite different from those on Maud Rise and Kerguelen Plateau. The middle Miocene sedimentary sequence (14.1–12.8 Ma) documents an intensification of East Antarctic glaciation. The sediments deposited during the late Miocene interval (8.7–6.5 Ma) and the Pliocene interval (5.1–2.7 Ma) indicate continued cooling of Antarctica, but a more dynamic Antarctic ice sheet resulting in episodic sedimentation patterns.

Project(s):

Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)

Coverage:

Median Latitude: -65.505495 * Median Longitude: 33.585413 * South-bound Latitude: -66.087330 * West-bound Longitude: 33.282330 * North-bound Latitude: -64.919830 * East-bound Longitude: 33.714330

Date/Time Start: 1990-03-26T10:31:00 * Date/Time End: 1990-03-29T01:41:00

Event(s):

PS1811-8 (PS16/515) * Latitude: -66.087330 * Longitude: 33.711160 * Date/Time: 1990-03-26T10:31:00 * Elevation: -1147.0 m * Penetration: 2.9 m * Recovery: 2.76 m * Location: Gunnerus Ridge * Campaign: (PS16) * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 3 core sections: 0-0.76, 0.76-1.76, 1.76-2.76 m

PS1812-6 (PS16/516) * Latitude: -66.062660 * Longitude: 33.282330 * Date/Time: 1990-03-26T16:34:00 * Elevation: -1356.0 m * Recovery: 7.38 m * Location: Gunnerus Ridge * Campaign: (PS16) * Basis: * Method/Device: Piston corer (BGR type) (KL) * Comment: 8 core sections: 0-0.4, 0.4-1.4, 1.4-2.4, 2.4-3.38, 3.38-4.38, 4.38-5.38, 5.38-6.38, 6.38-7.38 m

PS1813-6 (PS16/518) * Latitude: -64.952160 * Longitude: 33.633830 * Date/Time: 1990-03-28T11:06:00 * Elevation: -2223.0 m * Penetration: 13 m * Recovery: 12.54 m * Location: Kainan Maru Seamount * Campaign: (PS16) * Basis: * Method/Device: Piston corer (BGR type) (KL) * Comment: 13 core sections: 0-0.56, 0.56-1.56, 1.56-2.56, 2.56-3.53, 3.53-4.53, 4.53-5.53, 5.53-6.54, 6.54-7.54, 7.54-8.54, 8.54-9.54, 9.54-10.54, 10.54-11.54, 11.54-12.54 m; ev. ob. 2,5 m gestört, da Liner implodiert

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

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Datasets listed in this publication series

Hillenbrand, C-D; Ehrmann, W (2003): Sedimentology of core PS1811-8. https://doi.org/10.1594/PANGAEA.126300
Hillenbrand, C-D; Ehrmann, W (2003): Sedimentology of core PS1812-6. https://doi.org/10.1594/PANGAEA.126301
Hillenbrand, C-D; Ehrmann, W (2003): Sedimentology of core PS1813-6. https://doi.org/10.1594/PANGAEA.126303
Hillenbrand, C-D; Ehrmann, W (2003): Sedimentology of core PS1816-1. https://doi.org/10.1594/PANGAEA.126302