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Broecker, Wallace S; Klas, Mieczyslawa; Clark, Elizabeth; Bonani, Georges; Ivy, Susan; Wolfli, Willy (1991): Sedimentation rates calculated on surface sediment samples from different site of the Atlantic and Pacific Oceans (Table 1). PANGAEA,, Supplement to: Broecker, WS et al. (1991): The influence of CaCO3 dissolution on core top radiocarbon ages for deep-sea sediments. Paleoceanography, 6(5), 593-608,

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Radiocarbon ages on CaCO3 from deep-sea cores offer constraints on the nature of the CaCO3 dissolution process. The idea is that the toll taken by dissolution on grains within the core top bioturbation zone should be in proportion to their time of residence in this zone. If so, dissolution would shift the mass distribution in favor of younger grains, thereby reducing the mean radiocarbon age for the grain ensemble. We have searched in vain for evidence supporting the existence of such an age reduction. Instead, we find that for water depths of more than 4 km in the tropical Pacific the radiocarbon age increases with the extent of dissolution. We can find no satisfactory steady state explanation and are forced to conclude that this increase must be the result of chemical erosion. The idea is that during the Holocene the rate of dissolution of CaCO3 has exceeded the rain rate of CaCO3. In this circumstance, bioturbation exhumes CaCO3 from the underlying glacial sediment and mixes it with CaCO3 raining from the sea surface.
Related to:
Anderson, Robert F; Lao, Yong; Broecker, Wallace S; Trumbore, S; Hofmann, Hans J; Wolfli, Willy (1990): Boundary scavenging in the Pacific Ocean: a comparison of 10Be and 231Pa. Earth and Planetary Science Letters, 96(3-4), 287-304,
Andree, Michael; Oeschger, Hans; Broecker, Wallace S; Beavan, Nancy; Mix, Alan C; Bonani, Georges; Hofmann, Hans J; Morenzoni, Elvezio; Nessi, Marzio; Suter, Martin; Wolfli, Willy (1986): AMS radiocarbon dates on foraminifera from deep sea sediments. Radiocarbon, 28(2A), 424-428,
Bard, Edouard; Arnold, Maurice; Maurice, Pierre; Duprat, Josette M; Moyes, Jean; Duplessy, Jean-Claude (1987): Retreat velocity of the North Atlantic polar front during the last deglaciation determined by 14C accelerator mass spectrometry. Nature, 328, 791-794,
Berger, Wolfgang H; Killingley, John S (1982): Box cores from the equatorial Pacific: 14C sedimentation rates and benthic mixing. Marine Geology, 45(1-2), 93-125,
Berger, Wolfgang H; Killingley, John S; Metzler, C V; Vincent, Edith (1985): Two-Step Deglaciation: 14C-Dated High Resolution d18O Records from the Tropical Atlantik Ocean. Quaternary Research, 23(2), 258-271,
Broecker, Wallace S; Andree, Michael; Bonani, Georges; Wolfli, Willy; Klas, Mieczyslawa; Mix, Alan C; Oeschger, Hans (1988): Comparison between radiocarbon ages obtained on coexisting planktonic foraminifera. Paleoceanography, 3(6), 647-657,
Broecker, Wallace S; Turekian, Karl K; Heezen, Bruce C (1958): The relation of deep sea [Atlantic Ocean] sedimentation rates to variations in climate. American Journal of Science, 256(7), 503-517,
Clark, David L; Andree, Michael; Broecker, Wallace S; Mix, Alan C; Bonani, Georges; Hofmann, Hans J; Morenzoni, Elvezio; Nessi, Marzio; Suter, Martin; Woelfli, Willy (1986): Arctic Ocean chronology confirmed by accelerator 14C dating. Geophysical Research Letters, 13(4), 319-321,
DuBois, Lisa G; Prell, Warren L (1988): Effects of carbonate dissolution on the radiocarbon age structure of sediment mixed layers. Deep-Sea Research Part A. Oceanographic Research Papers, 35(12), 1875-1885,
Duplessy, Jean-Claude; Arnold, Maurice; Maurice, Pierre; Bard, Edouard; Duprat, Josette M; Moyes, Jean (1986): Direct dating of the oxygen-isotope record of the last deglaciation by 14C accelerator mass spectrometry. Nature, 320, 350-352,
Mix, Alan C; Ruddiman, William F (1985): Structure and timing of the last deglaciation: Oxygen isotope evidence. Quaternary Science Reviews, 4(2), 59-108,
Nozaki, Yoshiyuki; Cochran, J Kirk; Turekian, Karl K; Keller, Gerta (1977): Radiocarbon and 210Pb distribution in submersible-taken deep-sea cores from Project FAMOUS. Earth and Planetary Science Letters, 34(2), 167-173,
Peng, Tsung-Hung; Broecker, Wallace S; Berger, Wolfgang H (1979): Rates of benthic mixing in deep-sea sediment as determined by radioactive tracers. Quaternary Research, 11(1), 141-149,
Shackleton, Nicholas J; Berger, A; Peltier, W R (1990): An alternative astronomical calibration of the Lower Pleistocene timescale based on ODP Site 677. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 81(4), 251-261,
Shackleton, Nicholas J; Duplessy, Jean-Claude; Arnold, Maurice; Maurice, Pierre; Hall, Michael A; Cartlidge, Julie E (1988): Radiocarbon age of last glacial Pacific deep water. Nature, 335, 708-711,
Slowey, Niall C; Curry, William B (1987): Structure of the glacial thermocline at Little Bahama Bank. Nature, 54, 54-58,
Median Latitude: 6.207787 * Median Longitude: 0.633108 * South-bound Latitude: -17.638000 * West-bound Longitude: -174.702833 * North-bound Latitude: 78.225000 * East-bound Longitude: 163.707000
Date/Time Start: 1963-08-15T00:00:00 * Date/Time End: 1985-08-01T00:00:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 0.34 m
A180-74 * Latitude: -0.050000 * Longitude: -24.166667 * Elevation: -3329.0 m * Recovery: 4.8 m * Campaign: A150/180 * Method/Device: Piston corer (PC)
CH182-36 * Latitude: 26.200000 * Longitude: -77.600000 * Elevation: -650.0 m * Location: North Atlantic * Method/Device: Piston corer (PC)
CH73-013 * Elevation Start: -2209.0 m * Elevation End: 0.0 m * Campaign: CH7X * Basis: Jean Charcot * Method/Device: Piston corer (PC) * Comment: Position not given
depth is the apparent mixing depth, as determined by a downcore series of radiocarbon age
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Age, datedAge datedkaBroecker, Wallace SAge, 14C conventional
7Sedimentation rateSed ratecm/kaBroecker, Wallace SCalculatedsedimentation rates are based on radiocarbon dating
8Reference/sourceReferenceBroecker, Wallace S
219 data points

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