Feary, David A; Jarrard, Richard D (1993): (Appendix) Grain-size distribution, calcium carbonate content and proportion of cemented aggregates in ODP Site 133-820 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.788539, Supplement to: Feary, DA; Jarrard, RD (1993): Sedimentology and downhole log analysis of Site 820, central Great Barrier reef outer shelf: The factors controlling Pleistocene progradational and aggradational seismic geometry. 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, 315-326, https://doi.org/10.2973/odp.proc.sr.133.238.1993
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Abstract:
The textural and compositional characteristics of the 400 m sequence of Pleistocene wackestones and packstones intersected at Ocean Drilling Program (ODP) Site 820 reflect deposition controlled by fluctuations in sea-level, and by variations in the rate of sediment supply. The development of an effective reefal barrier adjacent to Site 820, between 760 k.y. and 1.01 Ma, resulted in a marked reduction in sediment accumulation rates on the central Great Barrier Reef outermost shelf and upper slope. This marked change corresponds with the transition from sigmoidal prograding seismic geometry in the lower 254 m of the sequence, to aggradational geometry in the top 146 m.
The reduction in the rate of sediment accumulation that followed development of the reefal barrier also caused a fundamental change in the way in which fluctuations in sea-level controlled sediment deposition. In the lower, progradational portion of the sequence, sea-level cyclicity is represented by superimposed coarsening-upward cycles. Although moderately calcareous throughout (mostly 35%-75% CaCO3), the depositional system acted in a similar manner to siliciclastic shelf depositional systems. Relative sea-level rises resulted in deposition of more condensed, less calcareous, fine, muddy wackestones at the base of each cycle. Sea-level highstands resulted in increased sedimentation rates and greater influx of coarse bioclastic material. Continued high rates of sedimentation of both coarse bioclastic material and mixed carbonate and terrigenous mud marked falling and low sea-levels. This lower part of the sequence therefore is dominated by coarse packstones, with only thin wackestone intervals representing transgressions.
In contrast, sea-level fluctuations following formation of an effective reefal barrier produced a markedly different sedimentary record. The more slowly deposited aggradational sequence is characterized by discrete thin interbeds of relatively coarse packstone within a predominantly fine wackestone sequence. These thin packstone beds resulted from relatively low sedimentation rates during falling and low sea-levels, with much higher rates of muddy sediment accumulation during rising and high sea-levels. The transition from progradational to aggradational sequence geometry therefore corresponds to a transition from a "siliciclastic-type" to a "carbonate-type" depositional system.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -16.637000 * Median Longitude: 146.303700 * South-bound Latitude: -16.637000 * West-bound Longitude: 146.303600 * North-bound Latitude: -16.637000 * East-bound Longitude: 146.303800
Date/Time Start: 1990-09-12T08:45:00 * Date/Time End: 1990-09-15T01:40:00
Minimum DEPTH, sediment/rock: 0.60 m * Maximum DEPTH, sediment/rock: 398.55 m
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
133-820B * Latitude: -16.637000 * Longitude: 146.303600 * Date/Time Start: 1990-09-12T18:00:00 * Date/Time End: 1990-09-15T01:40:00 * Elevation: -290.0 m * Penetration: 400 m * Recovery: 324.91 m * Location: Coral Sea * Campaign: Leg133 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 400 m cored; 0 m drilled; 81.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Feary, David A | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 4 | Size fraction > 0.500 mm, gravel | >500 µm | % | Feary, David A | Grain size, sieving | |
| 5 | Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand | 500-250 µm | % | Feary, David A | Grain size, sieving | |
| 6 | Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand | 250-125 µm | % | Feary, David A | Grain size, sieving | |
| 7 | Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand | 125-63 µm | % | Feary, David A | Grain size, sieving | |
| 8 | Size fraction 0.063-0.0039 mm | 63-3.9 µm | % | Feary, David A | Grain size, SEDIGRAPH 5100 | |
| 9 | Size fraction < 0.0039 mm | <3.9 µm | % | Feary, David A | Grain size, SEDIGRAPH 5100 | |
| 10 | Calcium carbonate | CaCO3 | % | Feary, David A | Carbonate bomb (Müller & Gastner, 1971) | |
| 11 | Aggregates | Agg | % | Feary, David A |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2602 data points
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