Peerdeman, F M; Davies, Peter J (1993): Pleistocene sedimentology of ODP Hole 133-820A from the northeastern Australian margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.705538, Supplement to: Peerdeman, FM; Davies, PJ (1993): Sedimentological response of an outer-shelf, upper-slope sequence to rapid changes in Pleistocene eustatic sea level: Hole 820A, northeastern Australian margin. In: McKenzie, JA; Davies, PJ; Palmer-Julson, A; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 133, 303-313, https://doi.org/10.2973/odp.proc.sr.133.236.1993
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Abstract:
A principal objective at Site 820, situated on the outer shelf, upper slope of the northeastern Australian continental margin, was to test the relationships between changes in Pleistocene sea level and sedimentary packages produced on a mixed carbonate-siliciclastic continental margin. To this end, we have examined the downcore distribution of grain size, magnetic susceptibility, and calcium-carbonate content throughout Hole 820A and, in particular, the top 35 meters below the seafloor (mbsf). These data are compared with variations in the oxygen-isotope signal defined for the same hole and are interpreted as indicating sea-level oscillations. The distribution of sand, mud, calcium carbonate of the mud fraction and total sample, and magnetic susceptibility during the last 20,000 yr defines the position of a sea-level regression (41,000-18,000 yr B.P.), a lowstand, early (18,000-9,400 yr B.P.) and late transgressions (9400-900 yr B.P.), and a highstand (4900 yr to the present).
The regression is seen first in a high-carbonate content peak. Calcium carbonate constituents mainly comprise skeletal carbonate grains, with abundant planktonic and benthic foraminifers, and lime muds. The lowstand is characterized by a maximum abundance of the sand fraction, which contains dominantly skeletal carbonate grains and a minor abundance of lithoclasts. Sand-sized terrigenous sediments are proposed to have bypassed the continental shelf during a lowstand of sea level. Sedimentation rates throughout the regression and lowstand are low (3.0 cm/k.y.). The early transgression, marked by highest values in magnetic susceptibility, displays a rapid increase in sedimentation rate that coincided with an increase in terrigenous mud. Highest sedimentation rates of 82.3 cm/k.y. occurred during the late transgression, with increasing percentages of lime-mud.
A decrease in noncarbonate constituents in the mud fraction during the late transgression and highstand of sea level is thought to be the result of restricted inner-shelf sedimentation of terrigenous sediments.
The same relationship is also seen in the major sea-level oscillation, which is interpreted as isotope stage 6.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -16.637000 * Longitude: 146.303800
Date/Time Start: 1990-09-12T08:45:00 * Date/Time End: 1990-09-12T18:00:00
Event(s):
133-820A * Latitude: -16.637000 * Longitude: 146.303800 * Date/Time Start: 1990-09-12T08:45:00 * Date/Time End: 1990-09-12T18:00:00 * Elevation: -289.0 m * Penetration: 144.3 m * Recovery: 146.14 m * Location: Coral Sea * Campaign: Leg133 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 144.3 m cored; 0 m drilled; 101.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Peerdeman, FM; Davies, PJ (1993): (Table 2) Age determination of ODP Hole 133-820A. https://doi.org/10.1594/PANGAEA.705537
- Peerdeman, FM; Davies, PJ (1993): (Table 1) Magnetic susceptibility, sand, mud and carbonate content of ODP Hole 133-820A. https://doi.org/10.1594/PANGAEA.705536