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Weinheimer, Amy L (2002): (Table T1) Abundance of radiolarian skeletons in scrape samples of ODP Hole 178-1098B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.142770, Supplement to: Weinheimer, AL (2002): Data report: Radiolarians in sediments from Palmer Deep, Antarctica, Leg 178, Site 1098. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-14, https://doi.org/10.2973/odp.proc.sr.178.221.2002

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Abstract:
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 incursions of CDW into Palmer Deep (Leventer et al., 1996). A distinctive diatom assemblage dominated by a single genus was associated with peaks in B. aculeata, whereas a few different assemblages were associated with lows in B. aculeata. Leventer et al. (1996) interpreted the variability in diatom assemblages as an indication of changes in productivity associated with changes in water column stability.
Abelmann and Gowing (1997) studied the horizontal and vertical distributions of radiolarians in the Atlantic sector of the Southern Ocean. They show that the spatial distribution of radiolarian assemblages reflects hydrographic boundaries. In a transect from the subtropical Atlantic to polar Antarctic zones, radiolarians in the upper 1000 m of the water column occurred in distinct surface and deep-living assemblages related to water depth, temperature, salinity, and nutrient content. Living assemblages resembled those preserved in underlying surface sediments (Abelmann and Gowing, 1997).
Circumantarctic coastal sediments from neritic environments contained a distinctive assemblage dominated by the Phormacantha hystrix/Plectacantha oikiskos group and Rhizoplegma boreale (Nishimura et al., 1997). Low diversity and species compositions distinguished the coastal sediments from the typical pelagic Antarctic assemblages. Factors that controlled the assemblages were water depth, proximity to the coast, occurrence of sea ice, and steepness of topography, rather than temperature and salinity. Nishimura et al. (1997) found a gradient of sorts from deep-water sites containing diverse assemblages typical of pelagic environments to coastal sites with low diversity assemblages dominated by P. hystrix/P. oikiskos group and R. boreale. In general, sites between these two extremes had increased proportions of the coastal assemblage with decreasing water depth (Nishimura et al., 1997). At a site near Hole 1098 (GC905), they showed that the relative abundance of the coastal assemblage increased downcore (Nishimura et al., 1997). The purpose of the research presented here was to make a cursory investigation into the radiolarian assemblages as possible paleoenvironmental indicators.
Project(s):
Coverage:
Latitude: -64.861930 * Longitude: -64.208000
Date/Time Start: 1998-03-13T00:00:00 * Date/Time End: 1998-03-13T00:00:00
Minimum DEPTH, sediment/rock: 1.5 m * Maximum DEPTH, sediment/rock: 45.0 m
Event(s):
178-1098B * Latitude: -64.861930 * Longitude: -64.208000 * Date/Time: 1998-03-13T00:00:00 * Elevation: -1010.6 m * Penetration: 43 m * Recovery: 44.66 m * Location: Drake Passage * Campaign: Leg178 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 43 m cored; 0 m drilled; 103.9 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmGeocode
Sample code/labelSample labelWeinheimer, Amy LDSDP/ODP/IODP sample designation
AbundanceAbundWeinheimer, Amy L
Radiolarian preservationRad preservWeinheimer, Amy LG = good, M = medium
Plectacantha oikiskosP. oikiskos#Weinheimer, Amy LCounting >45 µm fraction
Phormacantha hystrixP. hystrix#Weinheimer, Amy LCounting >45 µm fraction
Lithomelissa setosaL. setosa#Weinheimer, Amy LCounting >45 µm fraction
Antarctissa strelkoviA. strelkovi#Weinheimer, Amy LCounting >45 µm fraction
Antarctissa denticulataA. denticulata#Weinheimer, Amy LCounting >45 µm fraction
10 Lithomelissa sp.Lithomelissa sp.#Weinheimer, Amy LCounting >45 µm fraction
11 Spongodiscid sp.Spongodiscid sp.#Weinheimer, Amy LCounting >45 µm fraction
12 Rhizoplegma borealeR. boreale#Weinheimer, Amy LCounting >45 µm fraction
13 Dictyophimus gracilipesD. gracilipes#Weinheimer, Amy LCounting >45 µm fraction
14 Helotholus histricosaH. histricosa#Weinheimer, Amy LCounting >45 µm fraction
15 Phormostichoartus corbulaP. corbula#Weinheimer, Amy LCounting >45 µm fraction
16 Cromyechinus antarcticaC. antarctica#Weinheimer, Amy LCounting >45 µm fraction
17 Phorticium cleveiP. clevei#Weinheimer, Amy LCounting >45 µm fraction
18 Larcopyle buetschliiL. buetschlii#Weinheimer, Amy LCounting >45 µm fraction
19 Peridium spinipesP. spinipes#Weinheimer, Amy LCounting >45 µm fraction
20 Spongopyle osculosaS. osculosa#Weinheimer, Amy LCounting >45 µm fraction
21 Spyrid groupSpyrid gr#Weinheimer, Amy LCounting >45 µm fraction
22 Saccospyris antarcticaS. antarctica#Weinheimer, Amy LCounting >45 µm fraction
23 Spongotrochus glacialis groupS. glacialis gr#Weinheimer, Amy LCounting >45 µm fraction
24 Cycladophora bicornisC. bicornis#Weinheimer, Amy LCounting >45 µm fraction
25 Stylodictya multispinaS. multispina#Weinheimer, Amy LCounting >45 µm fraction
26 Sethoconus tabulatusS. tabulatus#Weinheimer, Amy LCounting >45 µm fraction
27 Lithelius nautiloidesL. nautiloides#Weinheimer, Amy LCounting >45 µm fraction
28 Botryostrobus auritus/australis groupB. auritus/australis gr#Weinheimer, Amy LCounting >45 µm fraction
29 Spongurus pylomaticusS. pylomaticus#Weinheimer, Amy LCounting >45 µm fraction
30 Spongurus sp.Spongurus sp.#Weinheimer, Amy LCounting >45 µm fraction
31 Siphocampe arachnea groupS. arachnea gr#Weinheimer, Amy LCounting >45 µm fraction
32 Arachnocorallium calvataA. calvata#Weinheimer, Amy LCounting >45 µm fractiongroup
33 Spongotrochus sp.Spongotrochus sp.#Weinheimer, Amy LCounting >45 µm fractionSpongotrochus sp. (?) cf. S.venustum
34 Lithelius minorL. minor#Weinheimer, Amy LCounting >45 µm fraction
35 Druppatractis irregularisD. irregularis#Weinheimer, Amy LCounting >45 µm fraction
36 Acanthosphaera corlocaeA. corlocae#Weinheimer, Amy LCounting >45 µm fraction
37 Actinomma spp.Actinomma spp.#Weinheimer, Amy LCounting >45 µm fraction
38 Cycladophora davisianaC. davisiana#Weinheimer, Amy LCounting >45 µm fraction
39 Actinomma sp.Actinomma sp.#Weinheimer, Amy LCounting >45 µm fractionActinomma sp. cf. A. leptodermum
40 Plectacantha sp.Plectacantha sp.#Weinheimer, Amy LCounting >45 µm fraction
41 Theocalyptra bicornisT. bicornis#Weinheimer, Amy LCounting >45 µm fraction
42 Triceraspyris antarcticaT. antarctica#Weinheimer, Amy LCounting >45 µm fraction
43 Porodiscus sp.Porodiscus sp.#Weinheimer, Amy LCounting >45 µm fraction
44 Octopyle stenozonaO. stenozona#Weinheimer, Amy LCounting >45 µm fraction
45 Eucyrtidium hexastichumE. hexastichum#Weinheimer, Amy LCounting >45 µm fraction
46 Lithomelissa thoracitesL. thoracites#Weinheimer, Amy LCounting >45 µm fraction
47 Eucyrtidium cf. teuscheriE. cf. teuscheri#Weinheimer, Amy LCounting >45 µm fraction
48 Euceryphalus histricosusE. histricosus#Weinheimer, Amy LCounting >45 µm fraction
49 Dictyophimus sp.Dictyophimus sp.#Weinheimer, Amy LCounting >45 µm fraction
50 Lithelius sp.Lithelius sp.#Weinheimer, Amy LCounting >45 µm fractionLithelius sp. 1
51 Amphiplecta sp.Amphiplecta sp.#Weinheimer, Amy LCounting >45 µm fraction
52 Cycladophora sp.Cycladophora sp.#Weinheimer, Amy LCounting >45 µm fraction
53 Stylochlamydium astericusS. astericus#Weinheimer, Amy LCounting >45 µm fraction
54 Antarctissa brevispinaA. brevispina#Weinheimer, Amy LCounting >45 µm fraction
55 Tetrapyle octacanthaT. octacantha#Weinheimer, Amy LCounting >45 µm fraction
56 Cyrtopera lagunculaC. laguncula#Weinheimer, Amy LCounting >45 µm fraction
57 Total countsTotal counts#Weinheimer, Amy L
Size:
1985 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Sample label

Abund

Rad preserv

P. oikiskos [#]

P. hystrix [#]

L. setosa [#]

A. strelkovi [#]

A. denticulata [#]
10 
Lithomelissa sp. [#]
11 
Spongodiscid sp. [#]
12 
R. boreale [#]
13 
D. gracilipes [#]
14 
H. histricosa [#]
15 
P. corbula [#]
16 
C. antarctica [#]
17 
P. clevei [#]
18 
L. buetschlii [#]
19 
P. spinipes [#]
20 
S. osculosa [#]
21 
Spyrid gr [#]
22 
S. antarctica [#]
23 
S. glacialis gr [#]
24 
C. bicornis [#]
25 
S. multispina [#]
26 
S. tabulatus [#]
27 
L. nautiloides [#]
28 
B. auritus/australis gr [#]
29 
S. pylomaticus [#]
30 
Spongurus sp. [#]
31 
S. arachnea gr [#]
32 
A. calvata [#]
33 
Spongotrochus sp. [#]
34 
L. minor [#]
35 
D. irregularis [#]
36 
A. corlocae [#]
37 
Actinomma spp. [#]
38 
C. davisiana [#]
39 
Actinomma sp. [#]
40 
Plectacantha sp. [#]
41 
T. bicornis [#]
42 
T. antarctica [#]
43 
Porodiscus sp. [#]
44 
O. stenozona [#]
45 
E. hexastichum [#]
46 
L. thoracites [#]
47 
E. cf. teuscheri [#]
48 
E. histricosus [#]
49 
Dictyophimus sp. [#]
50 
Lithelius sp. [#]
51 
Amphiplecta sp. [#]
52 
Cycladophora sp. [#]
53 
S. astericus [#]
54 
A. brevispina [#]
55 
T. octacantha [#]
56 
C. laguncula [#]
57 
Total counts [#]
1.5178-1098B-1H-15%-10%G11216512514141071310004401401100983201020070660020040254003211544
3.0178-1098B-1H-25%-10%G100859579611210011001212150660200010020500010000051101000361
4.5178-1098B-1H-35%-10%G145909265211231033110002010040100011010100000000000020000379
5.8178-1098B-1H-45%-10%G1565292811622110038502222050690400010050610000030015400000423
6.0178-1098B-1H-CC5%-10%G76808820625100221171300300010000001010230010000200000000300
7.5178-1098B-2H-15%-10%G598210001611112123810401050321000000000121000031000000000302
9.0178-1098B-2H-25%-10%G13844900784600037480301020281000100000501110000000000000345
10.5178-1098B-2H-35%-10%G90337001595111020443306020523000230020000002100000000000269
12.0178-1098B-2H-45%-10%G140391160605700045141200030270010000030000012000000000000349
13.5178-1098B-2H-55%-10%G15851101010461621005010301020271000000070001000000000000000379
15.0178-1098B-2H-65%-10%G12138122020261210003010311041570100000141002100000000000000358
15.5178-1098B-2H-75%-10%G1195110605031421000500311010241000000020000000000000000000321
16.0178-1098B-2H-CC<5%G148810502031441000320301040120000010010000000000000000000303
17.0178-1098B-3H-1<5%G1453210701801723007401325070210000000011200000000000000000351
18.5178-1098B-3H-2<5%G19733979621921002031211120510000110110000000000000000000380
20.0178-1098B-3H-35%-10%G227158171630730401200100020001000100000000000000000000000371
21.5178-1098B-3H-4<5%G181199712715730004111604030101000011000000000000000000000356
23.0178-1098B-3H-5<5%G9610481701700000111012030230010010000000000000000000000186
24.5178-1098B-3H-6<5%G20831670811610120310001010020000100000000000000000000000335
25.0178-1098B-3H-7<5%G-M10014270200000320000101010000000000000000000000000000000151
25.5178-1098B-3H-CC>5%G252161150231710201200000010100000000000000000000000000000404
26.5178-1098B-4H-1<5%G22531712110750311000112110200000000000000000000000000000356
28.0178-1098B-4H-2<5%G645240312020020110002000100002000000000000000000000000110
29.5178-1098B-4H-3<5%G346191290812341005101001010321110000000000000000000000000530
31.0178-1098B-4H-4<1%M-G8913250020420100020100000000000000000000000000000000000139
32.5178-1098B-4H-5<1%G1008270011200001000101111000000000000000000000000000000145
34.0178-1098B-4H-6<1%G859185100610010000000000000000000000000000000000000000126
34.5178-1098B-4H-7<1%G24518464000311300001000000000000000000000000000000000000322
36.0178-1098B-5H-1<1%G986260400300200001110000000000000000000000000000000000142
37.5178-1098B-5H-2<1%M151162601010510101001000000000000000000000000000000000000213
39.0178-1098B-5H-3<1%G36730410600500001110000000000000000000000000000000000000452
40.5178-1098B-5H-4<1%G248172201300500010000000000000000000000000000000000000000306
42.0178-1098B-5H-5<5%G252191301101420000000000000000000000000000000000000000000302
43.5178-1098B-5H-6<5%G16913155100211100000000000000000000000000000000000000000208
44.2178-1098B-5H-7<5%G339482365101100000000000000000000000000000000000000000000433
45.0178-1098B-5H-CC<5%G45333251451100000000000000532