Cowan, Ellen A; Hillenbrand, Claus-Dieter; Hassler, Lauren E; Ake, Matthew T (2008): Occurrence of microtextures recorded from quartz sand grains of ODP Hole 178-1101A (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.706581, Supplement to: Cowan, EA et al. (2008): Coarse-grained terrigenous sediment deposition on continental rise drifts: A record of Plio-Pleistocene glaciation on the Antarctic Peninsula. Palaeogeography, Palaeoclimatology, Palaeoecology, 265(3-4), 275-291, https://doi.org/10.1016/j.palaeo.2008.03.010
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Abstract:
Sediment drifts on the continental rise are located proximal to the western side of the Antarctic Peninsula and recorded changes in glacial volume and thermal regime over the last ca. 15 m.y. At Ocean Drilling Program (ODP) Site 1101 (Leg 178), which recovered sediments back to 3.1 Ma, glacial-interglacial cyclicity was identified based on the biogenic component and sedimentary structures observed in X-radiographs, magnetic susceptibility and lithofacies descriptions. Glacial intervals are dominated by fine-grained laminated mud and interglacial units consist of bioturbated muds enriched in biogenic components. From 2.2 to 0.76 Ma, planktonic foraminifera and calcareous nannofossils dominate in the interglacials suggesting a shift of the Antarctic Polar Front (APF) to the south near the drifts. Prior to 2.2 Ma, cyclicity cannot be identified and diatoms dominate the biogenic component and high percent opal suggests warmer conditions south of the APF and reduced sea ice over the drifts. Analyses of the coarse-grained terrigenous fraction (pebbles and coarse sand) from Sites 1096 and 1101 record glaciers at sea-level releasing iceberg-rafted debris (IRD) throughout the last 3.1 m.y. Analyses of quartz sand grains in IRD with the scanning electron microscope (SEM) show an abrupt change in the frequency of occurrence of microtextures at ~1.35 Ma. During the Late Pliocene to Early Pleistocene, the population of quartz grains included completely weathered grains and a low frequency of crushing and abrasion, suggesting that glaciers were small and did not inundate the topography. Debris shed from mountain peaks was transported supraglacially or englacially allowing weathered grains to pass through the glacier unmodified. During glacial periods from 1.35-0.76 Ma, glaciers expanded in size. The IRD flux was very high and dropstones have diverse lithologies. Conditions resembling those at the Last Glacial Maximum (LGM) have been episodically present on the Antarctic Peninsula since ~0.76 Ma. Quartz sand grains show high relief, fracture and abrasion common under thick ice and the IRD flux is low with a more restricted range of dropstone lithologies.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -64.372200 * Longitude: -70.261180
Date/Time Start: 1998-03-18T10:30:00 * Date/Time End: 1998-03-18T10:30:00
Minimum DEPTH, sediment/rock: 2.00 m * Maximum DEPTH, sediment/rock: 213.38 m
Event(s):
178-1101A * Latitude: -64.372200 * Longitude: -70.261180 * Date/Time: 1998-03-18T10:30:00 * Elevation: -3279.7 m * Penetration: 217.7 m * Recovery: 215.75 m * Location: South Pacific Ocean * Campaign: Leg178 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 217.7 m cored; 0 m drilled; 99.1 % recovery
Comment:
The composite depth scales and age models of Barker (2002, doi:10.2973/odp.proc.sr.178.219.2001) were used to develop a chronology. The age of each sample collected from Sites 1101 was computed by linear interpolation between magnetostratigraphic datums from Acton et al. (2002, doi:10.2973/odp.proc.sr.178.235.2002).
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
525 data points
Data
1 Depth sed [m] | 2 Age [ka BP] | 3 Sample label (DSDP/ODP/IODP sample designation) | 4 Roundness (Wadell Roundness, Scanning el...) | 5 Qz texture [%] (High relief, Scanning electro...) | 6 Qz texture [%] (Medium relief, Scanning elect...) | 7 Qz texture [%] (Low relief, Scanning electron...) | 8 Qz texture [%] (Fracture faces, Scanning elec...) | 9 Qz texture [%] (Breakage blocks, Scanning ele...) | 10 Qz texture [%] (Subparallel linear fracture, ...) | 11 Qz texture [%] (Conchoidal fractures, Scannin...) | 12 Qz texture [%] (Arcuate steps, Scanning elect...) | 13 Qz texture [%] (Straight steps, Scanning elec...) | 14 Qz texture [%] (Chattermark trails, Scanning ...) | 15 Qz texture [%] (Crescentic gouges, Scanning e...) | 16 Qz texture [%] (Curved grooves, Scanning elec...) | 17 Qz texture [%] (Straight grooves, Scanning el...) | 18 Qz texture [%] (V-shaped percussion, Scanning...) | 19 Qz texture [%] (Edge abrasion, Scanning elect...) | 20 Qz texture [%] (Sharp angular features, Scann...) | 21 Qz texture [%] (Edge rounding, Scanning elect...) | 22 Qz texture [%] (Preweathered surfaces, Scanni...) | 23 Qz texture [%] (Completely weathered, Scannin...) | 24 Qz texture [%] (Adhering particles, Scanning ...) | 25 Qz texture [%] (New precipitation, Scanning e...) | 26 Qz [#] (Number of, Counting 250-2000 ...) | 27 Comment (Glacial/interglacial) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2.00 | 28 | 178-1101A-1H-2,50-52 | 0.400 | 31 | 54 | 15 | 0 | 8 | 23 | 54 | 23 | 46 | 8 | 0 | 8 | 38 | 8 | 8 | 15 | 23 | 23 | 0 | 46 | 0 | 13 | G |
7.25 | 103 | 178-1101A-1H-5,125-127 | 0.359 | 35 | 53 | 12 | 18 | 12 | 6 | 35 | 29 | 41 | 12 | 12 | 0 | 12 | 6 | 12 | 18 | 6 | 53 | 0 | 12 | 18 | 17 | I |
9.95 | 142 | 178-1101A-2H-1,125-127 | 0.418 | 41 | 47 | 12 | 18 | 18 | 29 | 76 | 12 | 6 | 12 | 0 | 29 | 12 | 24 | 12 | 18 | 35 | 53 | 0 | 24 | 6 | 17 | I |
12.62 | 180 | 178-1101A-2H-3,125-127 | 0.378 | 30 | 59 | 11 | 0 | 11 | 0 | 41 | 22 | 19 | 11 | 0 | 7 | 22 | 4 | 22 | 22 | 26 | 41 | 0 | 11 | 11 | 27 | G |
21.70 | 309 | 178-1101A-3H-3,50-52 | 0.388 | 65 | 35 | 0 | 0 | 4 | 50 | 85 | 35 | 23 | 0 | 8 | 15 | 19 | 15 | 23 | 46 | 27 | 62 | 0 | 12 | 19 | 26 | I |
30.12 | 428 | 178-1101A-4H-2,85-87 | 0.428 | 36 | 56 | 8 | 52 | 24 | 24 | 20 | 20 | 4 | 4 | 4 | 12 | 0 | 8 | 40 | 40 | 68 | 44 | 8 | 40 | 8 | 25 | G |
35.70 | 508 | 178-1101A-4H-6,50-52 | 0.404 | 30 | 48 | 22 | 15 | 0 | 11 | 48 | 7 | 22 | 7 | 4 | 26 | 30 | 15 | 30 | 37 | 41 | 26 | 0 | 30 | 11 | 27 | I |
40.95 | 583 | 178-1101A-6H-2,94-96 | 0.405 | 44 | 48 | 8 | 64 | 21 | 13 | 18 | 23 | 8 | 8 | 0 | 18 | 15 | 5 | 36 | 33 | 38 | 51 | 3 | 59 | 8 | 39 | G |
50.44 | 717 | 178-1101A-7H-2,124-126 | 0.375 | 33 | 58 | 8 | 0 | 8 | 42 | 67 | 25 | 0 | 17 | 0 | 8 | 17 | 8 | 0 | 58 | 17 | 33 | 0 | 42 | 8 | 12 | I |
60.69 | 852 | 178-1101A-8H-3,49-51 | 0.430 | 55 | 45 | 0 | 45 | 30 | 20 | 15 | 25 | 15 | 5 | 5 | 15 | 0 | 5 | 15 | 30 | 45 | 65 | 10 | 0 | 0 | 20 | G |
62.21 | 872 | 178-1101A-8H-4,51-53 | 0.357 | 62 | 31 | 8 | 23 | 15 | 35 | 42 | 15 | 42 | 0 | 4 | 27 | 19 | 4 | 35 | 50 | 8 | 38 | 0 | 8 | 0 | 26 | G |
81.95 | 1209 | 178-1101A-10H-4,125-127 | 0.388 | 36 | 52 | 12 | 20 | 12 | 16 | 36 | 24 | 28 | 16 | 0 | 16 | 16 | 0 | 24 | 28 | 20 | 20 | 0 | 8 | 16 | 25 | G |
90.68 | 1329 | 178-1101A-11H-4,48-50 | 0.377 | 23 | 46 | 31 | 23 | 23 | 0 | 15 | 31 | 23 | 0 | 0 | 15 | 15 | 0 | 23 | 15 | 15 | 46 | 0 | 8 | 23 | 13 | I |
99.07 | 1451 | 178-1101A-12H-3,80-82 | 0.362 | 38 | 43 | 19 | 19 | 8 | 24 | 35 | 19 | 24 | 5 | 3 | 8 | 22 | 5 | 19 | 32 | 11 | 41 | 8 | 57 | 19 | 37 | G |
118.14 | 1729 | 178-1101A-14H-3,94-96 | 0.400 | 50 | 45 | 5 | 55 | 15 | 50 | 25 | 15 | 0 | 5 | 0 | 0 | 25 | 0 | 30 | 15 | 25 | 75 | 10 | 25 | 0 | 20 | G |
128.83 | 1988 | 178-1101A-15H-5,50-52 | 0.422 | 19 | 55 | 26 | 52 | 3 | 29 | 23 | 23 | 0 | 16 | 0 | 19 | 13 | 6 | 39 | 16 | 35 | 61 | 19 | 19 | 3 | 31 | G |
151.45 | 2368 | 178-1101A-17X-6,125-127 | 0.381 | 63 | 25 | 13 | 44 | 0 | 6 | 38 | 25 | 31 | 13 | 13 | 13 | 19 | 13 | 25 | 31 | 6 | 56 | 13 | 19 | 19 | 16 | NI |
165.47 | 2575 | 178-1101A-19X-4,84-86 | 0.380 | 33 | 44 | 22 | 14 | 3 | 6 | 28 | 19 | 25 | 6 | 3 | 11 | 17 | 8 | 11 | 14 | 17 | 28 | 19 | 33 | 3 | 36 | NI |
195.73 | 2894 | 178-1101A-22X-5,85-87 | 0.403 | 28 | 38 | 34 | 25 | 3 | 0 | 19 | 16 | 3 | 3 | 0 | 16 | 13 | 13 | 38 | 9 | 31 | 44 | 22 | 44 | 9 | 32 | NI |
208.96 | 3034 | 178-1101A-24X-1,79-81 | 0.373 | 33 | 47 | 20 | 40 | 0 | 27 | 13 | 27 | 27 | 0 | 13 | 0 | 13 | 20 | 27 | 27 | 33 | 47 | 20 | 80 | 20 | 15 | NI |
213.38 | 3081 | 178-1101A-24X-4,78-80 | 0.359 | 26 | 56 | 19 | 0 | 11 | 15 | 22 | 37 | 19 | 7 | 7 | 0 | 22 | 11 | 30 | 15 | 26 | 30 | 22 | 33 | 15 | 27 | NI |