Bathymetric distribution of fossil foraminifera within marine sediment cores from the eastern part of Lützow-Holm Bay, East Antarctica, and its paleoceanographic implications
Introduction
The evolution of the Antarctic ice-sheet periphery during the glacial–interglacial cycles of the past depends on marine paleoenvironmental changes in the coastal region, which is transitional between glacial and marine environments that closely interacted with each other. Studies of fossil organisms from marine deposits in the coastal region can provide such marine paleoenvironmental information, because marine organisms are sensitive to coastal marine environmental changes and record temporal and spatial changes.
In one of our recent unpublished studies (Igarashi et al., in preparation), we analyzed faunal characteristics of fossil foraminifera from Accelerator Mass Spectrometry (AMS) radiocarbon-dated, elevated marine deposits exposed on the eastern shore of Lützow-Holm Bay, East Antarctica. We detected distinct differences between pre-Holocene and Holocene faunas and presumed that recovery of Holocene faunas from the southeastern coast of Lützow-Holm Bay might be closely related to an intrusion of the Circumpolar Deep Water (CDW). However, we lacked foraminiferal and other evidence from submarine sediments of Lützow-Holm Bay. Therefore, faunal analysis of foraminifera coupled with age determination of submarine deposits of Lützow-Holm Bay would provide paleoceanographic information to evaluate the above presumption.
This paper presents the results of faunal analysis of foraminifera extracted from marine sediment cores collected from the sea floor of the eastern part of Lützow-Holm Bay. Chronology for these cores was determined by AMS radiocarbon dating of marine organic carbon from the cores. The paper then estimates the latest Quaternary paleoceanographic conditions in the eastern part of Lützow-Holm Bay based on bathymetric and geographical characteristics of foraminifera and evaluates the paleoceanographic interpretation hypothesized for the foraminiferal results from elevated marine deposits.
Section snippets
Radiocarbon dating
Traditional carbon-14 dating methods cannot be applied to submarine cores, because not enough organic or carbonate materials can be obtained from them. Therefore, these methods of age determination have not been used for submarine cores collected from the Lützow-Holm Bay region. A dredge sample of submarine sediments obtained from the northwestern offshore area of Lützow-Holm Bay gave a carbon-14 age of 5490±370 yr bp (Uchio, 1960a).
In recent years, however, the AMS technique has provided a
Materials and methods
Seventeen marine sediment cores and one surface sample, collected during the 22nd and 33rd Japanese Antarctic Research Expeditions (JARE-22, 1980–1982 and JARE-33, 1991–1993), were used in this study. Locations of sampling stations are shown in Fig. 1; their latitudes and longitudes, water depths, and length and diameter of sediment cores recovered are listed in Table 1. These samples were collected by using either three types of gravity corers (0.5, 1, or 2 m in length) or a piston corer (1.6 m
Lithology of sediments
The 17 cores contain sediments that are poorly consolidated with two dominant lithologies (Fig. 2). One is coarse- to fine-grained sand, commonly containing subangular pebbles and granules in cores recovered from the sea floor shallower than 500 m in the northeastern part of the embayment, except for one obtained in the Fuji Submarine Valley (Station A-4). The second is sandy silt to silt, with granules of less than several millimeters and with very rare subangular pebbles. The sediments were
Evaluation of AMS radiocarbon ages
The AMS radiocarbon ages of the submarine cores in the present study are all younger than the Last Glacial Maximum (Table 2; Fig. 2). However, based on the chronological results, correlation (1000 yr order) between the cores and the Holocene elevated marine deposits distributed on the eastern shore of Lützow-Holm Bay (Miura et al., 1998a) is problematic.
In the Antarctic Ocean, carbon-14 dates need to be corrected to account for the dilution effect of the seawater caused by the input of glacial
Conclusions
Our paleoenvironmental study in Lützow-Holm Bay, East Antarctica, by applying AMS radiocarbon chronology and faunal analysis of fossil foraminifera to marine gravity and piston cores collected by JARE (1981 and 1992) led us to the following conclusions:
- 1.
AMS radiocarbon dates produced from organic carbon were less than 16 ka (non-corrected). The chronological results are not applicable to detailed correlation among submarine cores and Holocene elevated marine deposits distributed on the eastern
Acknowledgements
The authors express their gratitude to Emeritus Professor Tsunemasa Saito of the Institute of Geology and Paleontology, Tohoku University, for his providing continued guidance, encouragement, and valuable suggestions. Deep appreciation is also expressed to the following persons: Dr Naomi Harada of Japan Marine Science and Technology Center (a member of JARE-33) and all the other members of JARE-33 for their devoted cooperation in sampling with the gravity cores during the full operation of
References (76)
Factors controlling CaCO3 dissolution in the Weddell Sea from foraminiferal distribution patterns
Mar. Geol.
(1975)- et al.
Application of tandem accelerator mass-spectrometer dating to late Pleistocene–Holocene sediments of the East Antarctic continental shelf
Quat. Res.
(1989) - et al.
Magnitude and geographic variation of the radiocarbon content in Antarctic marine life: Implications for reservoir corrections in radiocarbon dating
Quat. Sci. Rev.
(1992) - et al.
Source of hydrocarbons in marine sediments in Lützow-Holm Bay, Antarctica
Org. Geochem.
(1995) - et al.
Developing sediment geochronologies for high-latitude continental shelf deposits: a radiochemical approach
Mar. Geol.
(1992) - et al.
Oceanographic controls on benthic foraminifers from the Bellingshausen margin of the Antarctic Peninsula
Mar. Micropaleontol.
(1994) - et al.
Microfossil distributions in modern Amundsen Sea sediments
Mar. Micropaleontol.
(1987) - et al.
Distribution of arenaceous foraminifera in depth profiles of the Southern Ocean (Kerguelen Plateau area)
Palaeogeogr. Palaeoclimatol. Palaeoecol.
(1984) - et al.
Benthic foraminifera assemblages from the eastern Weddell Sea between 68 and 73°S: distribution, ecology and fossilization potential
Mar. Micropaleontol.
(1990) - et al.
Benthic foraminiferal assemblages from the eastern South Atlantic Polar Front region between 35° and 57°S: distribution, ecology, and fossilization potential
Mar. Micropaleontol.
(1993)
The distribution of Recent benthic foraminifera in the Polar Front region, southwest Atlantic
Mar. Micropaleontol.
Particle fluxes, benthic processes and paleoenvironmental record in the northern Weddell Sea
Deep-Sea Res.
Ice sheet retreat from the Antarctic Peninsula shelf
Continent. Shelf Res.
Distribution and ecology of benthic foraminifera in McMurdo Sound, Antarctica
Palaeogeogr. Palaeoclimatol. Palaeoecol.
Ecology and distribution of foraminifera in the Weddell Sea of Antarctica
Micropaleontology
Calcium carbonate dissolution in the Weddell Sea
Antarctic J. US
Pre-bomb radiocarbon and reservoir correction for calcareous marine species in the Southern Ocean
Geophys. Res. Lett.
A revision of Reophax and its type-species, with remarks on several other Recent hormosinid species (Protozoa: Foraminiferida) in the Collections of the British Museum (Natural History)
Bull. Br. Mus. Nat. Hist. (Zool.)
The Trochamminacea of the Discovery Reports, a review of the Trochamminacea (Protozoa: Foraminiferida) described from South Atlantic and Antarctic waters by Heron-Allen and Earland (1932) and Earland (1933; 1934; 1936)
Modern carbon-14 ages and reservoir corrections for the Antarctic Peninsula and Gerlache Strait area
Antarctic J. US
Accumulation of glacial marine sediments in fjords of the Antarctic Peninsula and their use as late Holocene paleoenvironmental indicators
Holocene chronology for the unconsolidated sediments at hole 740A: Prydz Bay, East Antarctica
Proc. Ocean Drilling Progm., Scient. Res.
Advance of East Antarctic outlet glaciers during the Hypsithermal: Implications for the volume state of the Antarctic ice sheet under global warming
Geology
300-year cyclycity in organic matter preservation in Antarctic fjord sediments
Late Holocene advance of the Müller Ice Shelf, Antarctic Peninsula: sedimentological, geochemical and paleontological evidence
Antarctic Sci.
Distribution of foraminifera in sediments of the Scotia Sea area, Antarctic waters
Late Cenozoic foraminiferal paleoecology of the Ross Sea, Antarctica
Micropaleontology
Benthic foraminifera from the continental margin off Queen Maud Land, Antarctica
Scient. Rep. First Indian Expedition to Antarctica, Techn. Publication
Hydrocarbon record of a marine sediment core from Lützow-Holm Bay, Antarctica
Proc. NIPR Symp. Polar Biol.
Chronology of glacial marine lithofacies related to the recession of the west antarctic ice sheet in the Ross Sea
Antarctic J. US
Foraminifera in the Gullmar Fjord and the Skagerak
Zoologiska Bidrag Från Uppsala
Marine fossils of 30–40 ka in raised beach deposits, and late Pleistocene glacial history around Lützow-Holm Bay, East Antarctica
Proc. NIPR Symp. Antarctic Geosci.
Occurrence and distribution of the planktonic foraminifer Neogloboquadrina pachyderma within annual and perennial sea ice of the eastern part of Lützow-Holm Bay, Antarctica
Proc. NIPR Symp. Polar Biol.
Oceanographic data of the 31st Japanese Antarctic Research Expedition from November 1989 to March 1990
JARE Data Rep.
Pleistocene invasion of a cool subtropical globorotalid fauna (planktonic foraminifera) into the Antarctic water
Res. Rep. JAPEX Res. Center
A revised classification of the unilocular Nodosaliida and Buliminida (Foraminifera)
Revista Española de Micropaleontologı́a
The Challenger Foraminifera
Emendation of the foraminiferal genus Cribrostomoides Cushman, 1910, and its taxonomic implications
J. Micropalaeontol.
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