(Table T1) Abundance of radiolarian skeletons in scrape samples of ODP Hole 178-1098B

• Main Author: Weinheimer, Amy L
• Format: Dataset
• Language: English
• Published: PANGAEA 2002
• Subjects: 178-1098B; Abundance; Acanthosphaera corlocae; Actinomma sp.; Actinomma spp.; Amphiplecta sp.; Antarctissa brevispina; Antarctissa denticulata; Antarctissa strelkovi; Arachnocorallium calvata; Botryostrobus auritus/australis group; Counting >45 µm fraction; Cromyechinus antarctica; Cycladophora bicornis; Cycladophora davisiana; Cycladophora sp.; Cyrtopera laguncula; DEPTH; sediment/rock; Dictyophimus gracilipes; Dictyophimus sp.; Drake Passage; DRILL; Drilling/drill rig; Druppatractis irregularis; DSDP/ODP/IODP sample designation; Euceryphalus histricosus; Eucyrtidium cf. teuscheri; Eucyrtidium hexastichum; Helotholus histricosa; Joides Resolution; Larcopyle buetschlii; Leg178; Lithelius minor; Lithelius nautiloides; Lithelius sp.; Lithomelissa setosa; Lithomelissa sp.; Lithomelissa thoracites; Ocean Drilling Program; Octopyle stenozona; ODP; Peridium spinipes; Phormacantha hystrix; Phormostichoartus corbula; Phorticium clevei; Plectacantha oikiskos; Plectacantha sp.; Porodiscus sp.; Radiolarian preservation; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Anvers Island; Renaud Island; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.142770; https://doi.org/10.1594/PANGAEA.142770

Palmer Deep is a series of three glacially overdeepened basins on the Antarctic Peninsula shelf, ~20 km southwest of Anvers Island. Site 1098 (64°51.72'S, 64°12.48'W) was drilled in the shallowest basin, Basin I, at 1012 m water depth. The sediment recovered was primarily laminated, siliceous, biogenic, pelagic muds alternating with siliciclastic hemipelagic sediments (Barker, Camerlenghi, Acton, et al., 1999). Sedimentation rates of 0.1725 cm/yr in the upper 25 m and 0.7-0.80 cm/yr in the lower 25 m of the core have been estimated from 14C (Domack et al., 2001). The oldest datable sediments have an age of ~13 ka and were underlain by diamicton sediments of the last glacial maximum (Domack et al., 2001). The large-scale water-mass distribution and circulation in the vicinity of Palmer Deep is dominated by Circumpolar Deep Water (CDW) below 200 m (Hofmann et al., 1996). Palmer Deep is too far from the coast to be influenced by glacial meltwater and cold-tongue generation associated with it (Domack and Williams, 1990; Dixon and Domack, 1991). Circulation patterns in the Palmer Deep area are not well understood, but evidence suggests southward flow across Palmer Deep from Anvers Island to Renaud Island (Kock and Stein, 1978). The water south of Anvers Island is nearly open with loose pack ice from February through May. The area is covered with sea ice beginning in June (Gloersen et al., 1992; Leventer et al., 1996). Micropaleontologic data from the work of Leventer et al. (1996) on a 9-m piston core has revealed circulation and climate patterns for the past 3700 yr in the Palmer Deep. The benthic foraminifer assemblage is dominated by two taxa, Bulimina aculeata and Bolivina pseudopunctata, which are inversely related. High relative abundances of B. aculeata occur cyclically over a period of ~230 yr. The assemblage associated with high abundance of B. aculeata in Palmer Deep resembles that from the Bellingshausen shelf, which is associated with CDW. In addition to the faunal evidence, hydrographic data indicate ...