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ice-rafted debris

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Journal Article
Journal: Geology
Published: 01 February 2013
Geology (2013) 41 (2): 155-158.
...David Small; Randall R. Parrish; William E.N. Austin; Peter A. Cawood; Vincent Rinterknecht Abstract Understanding the provenance of ice-rafted debris (IRD) provides a means to link the behavior of individual ice sheets to proxy records of climate change. Here we present a new approach...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 01 November 1978
GSA Bulletin (1978) 89 (11): 1619-1629.
...MICHAEL T. LEDBETTER; NORMAN D. WATKINS Abstract Changes in the abundance of ice-rafted debris in abyssal sediments of the Southern Ocean have been interpreted as evidence of variations in Antarctic glacial activity. When accompanied by a simultaneous increase in Mn micronodules, however...
Journal Article
Journal: GSA Bulletin
Published: 01 June 1976
GSA Bulletin (1976) 87 (6): 873-882.
...JOHN KEANY; MICHAEL LEDBETTER; NORMAN WATKINS; TER-CHIEN HUANG Abstract A simple model to explain the distribution of ice-rafted debris in deep-sea sediments of the Southern Ocean proposes that ice-rafted debris maxima in the high latitudes are associated with interglacial periods and in the lower...
Image
Visual description of core (IRD, <b>ice</b>-<b>rafted</b> <b>debris</b>).
Published: 31 March 2017
Fig. 4. Visual description of core (IRD, ice-rafted debris).
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Reconstructed δ 18 O seawater  (‰ SMOW), and per cent <b>ice</b>-<b>rafted</b> <b>debris</b> (% ...
Published: 01 March 2015
Fig. 4. Reconstructed δ 18 O seawater (‰ SMOW), and per cent ice-rafted debris (% IRD; lithic grains larger than 250 µm) at core MD95-2024 from Orphan Knoll in the Labrador Sea for the last 12000 years BP. Bottom panel shows a record of detrital carbonate from Laurentian fan record(s) MC21
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Annual measurements of Hvítárvatn (Iceland) <b>ice</b>-<b>rafted</b> <b>debris</b> (IRD) and cla...
in > Geology
Published: 01 February 2015
Figure 3. Annual measurements of Hvítárvatn (Iceland) ice-rafted debris (IRD) and clay laminae thickness plotted with instrumental precipitation and summer (JJA—June, July, August) temperature (Temp.). IRD is presented as the average number (Ave. #; arithmetic mean) of clasts ≥0.5 mm deposited
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Evidence of outcrop rock collected by dredge versus <b>ice</b>-<b>rafted</b> <b>debris</b> (IRD)...
in > Geosphere
Published: 01 February 2015
Figure 3. Evidence of outcrop rock collected by dredge versus ice-rafted debris (IRD): (A) Dredge log from U.S. Coast Guard Cutter (USCGC) Healy showing tension changes during dredging operation: (1) tension rises as dredge is lowered; (2) tension is flat as wire is fed out; (3) significant
Image
In situ detrital feldspar Pb isotope data on <b>ice</b>-<b>rafted</b> <b>debris</b> (IRD) from t...
in > Geology
Published: 01 February 2013
Figure 2. In situ detrital feldspar Pb isotope data on ice-rafted debris (IRD) from the southern Weddell Sea, Antarctica. Symbols reflect the sampling sites shown in Figure 1 . Error bars are 2σ. Fields for Pb composition from exposed crystalline rocks ( Flowerdew et al., 2012 ) are plotted
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δ 18 O foram  (foraminifera) and <b>ice</b>-<b>rafted</b> <b>debris</b> (IRD) flux records from ...
in > Geology
Published: 01 February 2013
Figure 2. δ 18 O foram (foraminifera) and ice-rafted debris (IRD) flux records from sediment core MD95–2007, shown in comparison to North Greenland Ice Core Project (NGRIP) δ 18 O ice (b2k—before 2000 A.D.). Asterisks denote available accelerator mass spectrometry 14 C ages. Shading highlights
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Probability distributions and histograms for <b>ice</b>-<b>rafted</b> <b>debris</b> (IRD) and fl...
in > Geology
Published: 01 February 2013
Figure 4. Probability distributions and histograms for ice-rafted debris (IRD) and fluvial rutile and IRD zircon.
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Sedimentary logs, <b>ice</b>-<b>rafted</b> <b>debris</b> counts, shear strength, and calibrated ...
Published: 01 May 2011
Figure 3. Sedimentary logs, ice-rafted debris counts, shear strength, and calibrated accelerator mass spectrometer (AMS) radiocarbon dates from cores discussed in the text. The positions of X-radiographs in Figure 5 are also shown.
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(A) Record of <b>ice</b>-<b>rafted</b> <b>debris</b> from marine core DAPC2 from the northeast A...
Published: 01 January 2009
Figure 10. (A) Record of ice-rafted debris from marine core DAPC2 from the northeast Atlantic, ~200 km west of northwest Scotland ( Knutz et al., 2007 ). (B) Our mean 10 Be age from combined Furnace Lough and Ox Mountain data set (black solid dot; 1σ internal error shown by black line; 1σ error
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Figure 3. A: Photograph and line drawing of <b>ice</b>-<b>rafted</b> <b>debris</b> horizon from ...
in > Geology
Published: 01 October 2000
Figure 3. A: Photograph and line drawing of ice-rafted debris horizon from lower Southern Highland Group (Tremone Bay, Inishowen). Horizon consists of interbedded mudstone turbidites (light gray, relatively free of ice-rafted debris) and laminated pelagic sedimentary rocks (dark gray, relatively
Series: GSA Special Papers
Published: 01 January 1991
DOI: 10.1130/SPE261-p27
... on and at the base of the eastern slope of the sound, while thinly bedded, coarse-grained, and fine-grained distal turbidites occur in the central basin. Within the Erebus Basin, sedimentary deposits consist primarily of diatomaceous ooze and mud, and coarse-grained ice-rafted debris. The facies of the basin also...
Journal Article
Journal: Geology
Published: 01 February 1998
Geology (1998) 26 (2): 103-106.
...Reinhard Hesse; Saeed Khodabakhsh Abstract Late Pleistocene Heinrich ice-rafting events produced layers rich in ice-rafted debris in major parts of the North Atlantic north of 40°N. A high detrital carbonate content points to the Hudson Strait outlet of the Laurentide ice sheet as a dominant source...
Series: GSA Special Papers
Published: 01 January 1980
DOI: 10.1130/SPE181-p1
...-marine sedimentation. The major process that affected deposition of ice-rafted debris in the Arctic Ocean study area may have been mid-depth oceanic circulation. Little evidence was found to support the hypothesis that the reworking of central Arctic Basin glacial-marine sediment by bottom currents had...
Series: Geological Society, London, Special Publications
Published: 01 January 2014
DOI: 10.1144/SP398.8
EISBN: 9781862396746
... Abstract Ice-rafted tephra deposits, of Marine Isotope Stage 6 (MIS 6) age, from Site U 1304 on the Gardar Drift, North Atlantic were examined for their shard size distribution and major element composition. The heterogeneous composition, large shard sizes and association with ice-rafted debris...
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Journal Article
Journal: Geology
Published: 01 February 2013
Geology (2013) 41 (2): 147-150.
...Figure 2. In situ detrital feldspar Pb isotope data on ice-rafted debris (IRD) from the southern Weddell Sea, Antarctica. Symbols reflect the sampling sites shown in Figure 1 . Error bars are 2σ. Fields for Pb composition from exposed crystalline rocks ( Flowerdew et al., 2012 ) are plotted...
FIGURES
Journal Article
Published: 01 December 2005
South African Journal of Geology (2005) 108 (4): 557-577.
... in ice-rafted debris. The sediment is almost exclusively derived from the then top 60 m of the underlying carbonate (limestone and dolostone) platform and foreslope. Although most sediment transport indicators in the proglacial and subglacial strata are southerly-directed ( i.e., down-slope), rare...
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Journal Article
Journal: GSA Bulletin
Published: 01 June 1973
GSA Bulletin (1973) 84 (6): 2043-2052.
... 34-6; E 36-37) contain no ice-rafted debris. The other core (E 34-5) is of latest Miocene to earliest Pliocene age (approximately 4.0 to 5.0 m.y. B.P.) and is the oldest known late Cenozoic core containing ice-rafted debris. Quartz sand first appears in this core within the Gilbert c paleomagnetic...