Tooze, Sian; Halpin, Jacqueline A; Chase, Zanna; Armand, Leanne K; O'Brien, Philip E; Noble, Taryn L (2019): Scratching the surface: a new marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.907799
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Abstract:
The subglacial geology in Wilkes Land, East Antarctica is masked by thick ice and remains largely unexplored. Yet the underlying crustal architecture records evidence of repeated supercontinent cycles and provides the geological template for the evolution of the Antarctic Ice Sheet. Sediment eroded from under the ice is ultimately deposited in the ocean, such that marine sediment can be used to characterise the adjacent subglacial geology. We use detrital grain morphology, geochemistry and isotopic data from a kasten core to construct a new marine sediment provenance record for the continental slope of central Wilkes Land, and provide new isotopic signatures from proximal coastal outcrops for comparison. We establish the source rock type, age and provenance, and the associated transport pathways and mechanisms responsible for detrital sediment input from 23.5 ka to present. A principally igneous source is revealed with dominant age populations between c. 1200-1100 Ma and c. 1600-1300 Ma, characteristic of the proximal Banzare, Nuyina and Wilkes Provinces. The detrital geochronology suggests no change in sediment provenance over the last 23.5 ka, despite major ice sheet retreat during this time. A minor c. 700-500 Ma detrital age population unknown from the central Wilkes region was likely transported westward via icebergs to the core site. These findings broadly correspond with earlier interpretations of the subglacial geology and erosion rates at the base of the ice sheet predicted from two ice sheet models, demonstrating the value of sediment provenance studies for uncovering proximal subglacial geology and reconstructing past ice sheet configurations.
Supplement to:
Tooze, Sian; Halpin, Jacqueline A; Noble, Taryn L; Chase, Zanna; O'Brien, Philip E; Armand, Leanne K (2020): Scratching the Surface: A Marine Sediment Provenance Record From the Continental Slope of Central Wilkes Land, East Antarctica. Geochemistry, Geophysics, Geosystems, 21(11), https://doi.org/10.1029/2020GC009156
Coverage:
Median Latitude: -64.920228 * Median Longitude: 116.873200 * South-bound Latitude: -66.789400 * West-bound Longitude: 111.100000 * North-bound Latitude: -64.539000 * East-bound Longitude: 120.990800
Date/Time Start: 2018-03-22T00:00:00 * Date/Time End: 2018-11-26T20:17:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
4 datasets
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Datasets listed in this publication series
- Tooze, S; Halpin, JA; Chase, Z et al. (2019): Age model for sediment core IN2017_V01-A042-KC14. https://doi.org/10.1594/PANGAEA.907798
- Tooze, S; Halpin, JA; Chase, Z et al. (2019): Iceberg-rafted debris flux and biogenic silica concentrations in sediment core IN2017_V01-A042-KC14. https://doi.org/10.1594/PANGAEA.907796
- Tooze, S; Halpin, JA; Chase, Z et al. (2019): Pb-Pb and trace element analyses of detrital feldspars from sediment core IN2017_V01-A042-KC14 and in-situ feldspars from coastal rocks of Chick Island and Balaena Islets, East Antarctica. https://doi.org/10.1594/PANGAEA.907778
- Tooze, S; Halpin, JA; Chase, Z et al. (2020): U-Pb analyses and trace element data for detrital zircon, apatite and titanite in sediment core IN2017_V01-A042-KC14. https://doi.org/10.1594/PANGAEA.919944