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Melles, Martin (1991): Sedimentology at the continental margin of the southern Weddell Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.729620, Supplement to: Melles, M (1991): Paläoglaziologie und Paläozeanographie im Spätquartär am Kontinentalrand des südlichen Weddellmeeres, Antarktis (Late Quaternary paleoglaciology and paleoceanography at the continental margin of the southern Weddell Sea, Antarctica). Berichte zur Polarforschung = Reports on Polar Research, 81, 190 pp, https://doi.org/10.2312/BzP_0081_1991

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Abstract:
During four expeditions with RV "Polarstern" at the continental margin of the southern Weddell Sea, profiling and geological sampling were carried out. A detailed bathymetric map was constructed from echo-sounding data. Sub-bottom profiles, classified into nine echotypes, have been mapped and interpreted. Sedimentological analyses were carried out on 32 undisturbed box grab surface samples, as well as on sediment cores from 9 sites. Apart from the description of the sediments and the investigation of sedimentary structures on X-radiographs the following characteristics were determined: grain-size distributions; carbonate and Corg content; component distibutions in different grain-size fractions; stable oxygen and carbon isotopes in planktic and, partly, in benthic foraminifers; and physical properties. The stratigraphy is based On 14C-dating, oxygen isotope Stages and, at one site, On paleomagnetic measurements and 230Th-analyses The sediments represent the period of deposition from the last glacial maximum until recent time. They are composed predominantly of terrigenous components. The formation of the sediments was controlled by glaciological, hydrographical and gravitational processes. Variations in the sea-ice coverage influenced biogenic production. The ice sheet and icebergs were important media for sediment transport; their grounding caused compaction and erosion of glacial marine sediments on the outer continental shelf. The circulation and the physical and chemical properties of the water masses controlled the transport of fine-grained material, biogenic production and its preservation. Gravitational transport processes were the inain mode of sediment movements on the continental slope.
The continental ice sheet advanced to the shelf edge and grounded On the sea-floor, presumably later than 31,000 y.B.P. This ice movement was linked with erosion of shelf sediments and a very high sediment supply to the upper continental slope from the adiacent southern shelf. The erosional surface On the shelf is documented in the sub-bottom profiles as a regular, acoustically hard reflector. Dense sea-ice coverage above the lower and middle continental slope resulted in the almost total breakdown of biogenic production. Immediately in front of the ice sheet, above the upper continental slope, a <50 km broad coastal polynya existed at least periodically. Biogenic production was much higher in this polynya than elsewhere. Intense sea-ice formation in the polynya probably led to the development of a high salinity and, consequently, dense water mass, which flowed as a stream near bottom across the continental slope into the deep sea, possibly contributing to bottom water formation. The current velocities of this water mass presumably had seasonal variations. The near-bottom flow of the dense water mass, in combination with the gravity transport processes that arose from the high rates of sediment accumulation, probably led to erosion that progressed laterally from east to West along a SW to NE-trending, 200 to 400 m high morphological step at the continental slope.
During the period 14,000 to 13,000 y.B.P., during the postglacial temperature and sea-level rise, intense changes in the environmental conditions occured. Primarily, the ice masses on the outer continental shelf started to float. Intense calving processes resulted in a rapid retreat of the ice edge to the south. A consequence of this retreat was, that the source area of the ice-rafted debris changed from the adjacent southern shelf to the eastern Weddell Sea. As the ice retreated, the gravitational transport processes On the continental slope ceased. Soon after the beginning of the ice retreat, the sea-ice coverage in the whole research area decreased. Simultaneously, the formation of the high salinity dense bottom water ceased, and the sediment composition at the continental slope then became influenced by the water masses of the Weddell Gyre.
The formation of very cold Ice Shelf Water (ISW) started beneath the southward retreating Filchner-Ronne Ice Shelf somewhat later than 12,000 y.B.P. The ISW streamed primarily with lower velocities than those of today across the continental slope, and was conducted along the erosional step on the slope into the deep sea. At 7,500 y.B.P., the grounding line of the ice masses had retreated > 400 km to the south. A progressive retreat by additional 200 to 300 km probably led to the development of an Open water column beneath the ice south of Berkner Island at about 4,000 y.B.P. This in turn may have led to an additional ISW, which had formed beneath the Ronne Ice Shelf, to flow towards the Filcher Ice Shelf. As a result, increased flow of ISW took place over the continental margin, possibly enabling the ISW to spill over the erosional step On the upper continental slope towards the West. Since that time, there is no longer any documentation of the ISW in the sedimentary Parameters on the lower continental slope. There, recent sediments reflect the lower water masses of the Weddell Gyre. The sea-ice coverage in early Holocene time was again so dense that biogenic production was significantly restricted.
Related to:
Melles, Martin; Kuhn, Gerhard; Fütterer, Dieter K; Meischner, Dieter (1995): Processes of modern sedimentation in the Southern Weddell Sea, Antarctica - evidence from surface sediments. Polarforschung, 64(2), 45-74, hdl:10013/epic.29727.d001
Coverage:
Median Latitude: -76.175294 * Median Longitude: -37.043437 * South-bound Latitude: -77.737290 * West-bound Longitude: -61.321667 * North-bound Latitude: -65.050000 * East-bound Longitude: -5.616660
Date/Time Start: 1983-02-13T00:00:00 * Date/Time End: 1988-02-03T17:39:00
Event(s):
PS1010-1 (PS01/154) * Latitude: -77.241700 * Longitude: -34.540000 * Date/Time: 1983-02-13T00:00:00 * Elevation: -476.0 m * Penetration: 0.26 m * Recovery: 0.23 m * Location: Filchner Trough * Campaign: ANT-I/2 (PS01) * Basis: Polarstern * Device: Giant box corer (GKG)
PS1011-1 (PS01/155) * Latitude: -77.283000 * Longitude: -35.395000 * Date/Time: 1983-02-13T00:00:00 * Elevation: -721.0 m * Penetration: 0.34 m * Recovery: 0.33 m * Location: Filchner Trough * Campaign: ANT-I/2 (PS01) * Basis: Polarstern * Device: Giant box corer (GKG)
PS1012-1 (PS01/156) * Latitude: -77.304500 * Longitude: -35.814500 * Date/Time: 1983-02-13T00:00:00 * Elevation: -1021.0 m * Penetration: 0.5 m * Recovery: 0.43 m * Location: Filchner Trough * Campaign: ANT-I/2 (PS01) * Basis: Polarstern * Device: Giant box corer (GKG)
Size:
209 datasets

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  1. Melles, M (1991): Analyses of the recent components in surface sediments from the continental margin of the southern Weddell Sea (Table 12). https://doi.org/10.1594/PANGAEA.633543
  2. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1010-1. https://doi.org/10.1594/PANGAEA.623648
  3. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1011-1. https://doi.org/10.1594/PANGAEA.623649
  4. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1012-1. https://doi.org/10.1594/PANGAEA.623650
  5. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1013-1. https://doi.org/10.1594/PANGAEA.623651
  6. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1014-1. https://doi.org/10.1594/PANGAEA.623652
  7. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1016-1. https://doi.org/10.1594/PANGAEA.623653
  8. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1215-2. https://doi.org/10.1594/PANGAEA.623654
  9. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1216-1. https://doi.org/10.1594/PANGAEA.623655
  10. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1217-1. https://doi.org/10.1594/PANGAEA.623656
  11. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1219-1. https://doi.org/10.1594/PANGAEA.623657
  12. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1220-3. https://doi.org/10.1594/PANGAEA.623658
  13. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1222-1. https://doi.org/10.1594/PANGAEA.623659
  14. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1223-1. https://doi.org/10.1594/PANGAEA.623660
  15. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1275-1. https://doi.org/10.1594/PANGAEA.623672
  16. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1276-1. https://doi.org/10.1594/PANGAEA.623673
  17. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1277-1. https://doi.org/10.1594/PANGAEA.623663
  18. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1278-1. https://doi.org/10.1594/PANGAEA.623664
  19. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1279-1. https://doi.org/10.1594/PANGAEA.623665
  20. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1400-4. https://doi.org/10.1594/PANGAEA.623666
  21. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1401-2. https://doi.org/10.1594/PANGAEA.623667
  22. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1402-2. https://doi.org/10.1594/PANGAEA.623668
  23. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1403-1. https://doi.org/10.1594/PANGAEA.623669
  24. Melles, M (1991): Analyses of the recent components in the sand fraction of sediment core PS1422-1. https://doi.org/10.1594/PANGAEA.623670
  25. Melles, M (1991): Analyses of the recent components of sediment core PS1010-1. https://doi.org/10.1594/PANGAEA.624050
  26. Melles, M (1991): Analyses of the recent components of sediment core PS1010-1. https://doi.org/10.1594/PANGAEA.622935
  27. Melles, M (1991): Analyses of the recent components of sediment core PS1011-1. https://doi.org/10.1594/PANGAEA.622936
  28. Melles, M (1991): Analyses of the recent components of sediment core PS1011-1. https://doi.org/10.1594/PANGAEA.624051
  29. Melles, M (1991): Analyses of the recent components of sediment core PS1012-1. https://doi.org/10.1594/PANGAEA.622937
  30. Melles, M (1991): Analyses of the recent components of sediment core PS1012-1. https://doi.org/10.1594/PANGAEA.624052
  31. Melles, M (1991): Analyses of the recent components of sediment core PS1013-1. https://doi.org/10.1594/PANGAEA.622938
  32. Melles, M (1991): Analyses of the recent components of sediment core PS1013-1. https://doi.org/10.1594/PANGAEA.624053
  33. Melles, M (1991): Analyses of the recent components of sediment core PS1014-1. https://doi.org/10.1594/PANGAEA.624054
  34. Melles, M (1991): Analyses of the recent components of sediment core PS1014-1. https://doi.org/10.1594/PANGAEA.622939
  35. Melles, M (1991): Analyses of the recent components of sediment core PS1016-1. https://doi.org/10.1594/PANGAEA.622940
  36. Melles, M (1991): Analyses of the recent components of sediment core PS1016-1. https://doi.org/10.1594/PANGAEA.624055
  37. Melles, M (1991): Analyses of the recent components of sediment core PS1215-2. https://doi.org/10.1594/PANGAEA.622941
  38. Melles, M (1991): Analyses of the recent components of sediment core PS1215-2. https://doi.org/10.1594/PANGAEA.624056
  39. Melles, M (1991): Analyses of the recent components of sediment core PS1216-1. https://doi.org/10.1594/PANGAEA.622942
  40. Melles, M (1991): Analyses of the recent components of sediment core PS1216-1. https://doi.org/10.1594/PANGAEA.624057
  41. Melles, M (1991): Analyses of the recent components of sediment core PS1217-1. https://doi.org/10.1594/PANGAEA.622943
  42. Melles, M (1991): Analyses of the recent components of sediment core PS1217-1. https://doi.org/10.1594/PANGAEA.624058
  43. Melles, M (1991): Analyses of the recent components of sediment core PS1219-1. https://doi.org/10.1594/PANGAEA.622944
  44. Melles, M (1991): Analyses of the recent components of sediment core PS1219-1. https://doi.org/10.1594/PANGAEA.624059
  45. Melles, M (1991): Analyses of the recent components of sediment core PS1220-3. https://doi.org/10.1594/PANGAEA.622945
  46. Melles, M (1991): Analyses of the recent components of sediment core PS1220-3. https://doi.org/10.1594/PANGAEA.624060
  47. Melles, M (1991): Analyses of the recent components of sediment core PS1222-1. https://doi.org/10.1594/PANGAEA.622946
  48. Melles, M (1991): Analyses of the recent components of sediment core PS1222-1. https://doi.org/10.1594/PANGAEA.624061
  49. Melles, M (1991): Analyses of the recent components of sediment core PS1223-1. https://doi.org/10.1594/PANGAEA.622947
  50. Melles, M (1991): Analyses of the recent components of sediment core PS1223-1. https://doi.org/10.1594/PANGAEA.624062
  51. Melles, M (1991): Analyses of the recent components of sediment core PS1275-1. https://doi.org/10.1594/PANGAEA.622948
  52. Melles, M (1991): Analyses of the recent components of sediment core PS1275-1. https://doi.org/10.1594/PANGAEA.624063
  53. Melles, M (1991): Analyses of the recent components of sediment core PS1276-1. https://doi.org/10.1594/PANGAEA.624064
  54. Melles, M (1991): Analyses of the recent components of sediment core PS1276-1. https://doi.org/10.1594/PANGAEA.622949
  55. Melles, M (1991): Analyses of the recent components of sediment core PS1277-1. https://doi.org/10.1594/PANGAEA.622950
  56. Melles, M (1991): Analyses of the recent components of sediment core PS1277-1. https://doi.org/10.1594/PANGAEA.624065
  57. Melles, M (1991): Analyses of the recent components of sediment core PS1278-1. https://doi.org/10.1594/PANGAEA.622951
  58. Melles, M (1991): Analyses of the recent components of sediment core PS1278-1. https://doi.org/10.1594/PANGAEA.624066
  59. Melles, M (1991): Analyses of the recent components of sediment core PS1279-1. https://doi.org/10.1594/PANGAEA.624067
  60. Melles, M (1991): Analyses of the recent components of sediment core PS1279-1. https://doi.org/10.1594/PANGAEA.622952
  61. Melles, M (1991): Analyses of the recent components of sediment core PS1400-4. https://doi.org/10.1594/PANGAEA.622953
  62. Melles, M (1991): Analyses of the recent components of sediment core PS1400-4. https://doi.org/10.1594/PANGAEA.624068
  63. Melles, M (1991): Analyses of the recent components of sediment core PS1401-2. https://doi.org/10.1594/PANGAEA.622954
  64. Melles, M (1991): Analyses of the recent components of sediment core PS1401-2. https://doi.org/10.1594/PANGAEA.624069
  65. Melles, M (1991): Analyses of the recent components of sediment core PS1402-2. https://doi.org/10.1594/PANGAEA.624070
  66. Melles, M (1991): Analyses of the recent components of sediment core PS1402-2. https://doi.org/10.1594/PANGAEA.622955
  67. Melles, M (1991): Analyses of the recent components of sediment core PS1403-1. https://doi.org/10.1594/PANGAEA.624071
  68. Melles, M (1991): Analyses of the recent components of sediment core PS1403-1. https://doi.org/10.1594/PANGAEA.622956
  69. Melles, M (1991): Analyses of the recent components of sediment core PS1422-1. https://doi.org/10.1594/PANGAEA.622957
  70. Melles, M (1991): Analyses of the recent components of sediment core PS1422-1. https://doi.org/10.1594/PANGAEA.624072
  71. Melles, M (1991): Bulk parameter of sediment core PS1420-1. https://doi.org/10.1594/PANGAEA.96526
  72. Melles, M (1991): Bulk parameter of sediment core PS1420-2. https://doi.org/10.1594/PANGAEA.96689
  73. Melles, M (1991): Bulk parameter of sediment core PS1494-2. https://doi.org/10.1594/PANGAEA.96690
  74. Melles, M (1991): Bulk parameter of sediment core PS1494-3. https://doi.org/10.1594/PANGAEA.96527
  75. Melles, M (1991): Bulk parameter of sediment core PS1498-1. https://doi.org/10.1594/PANGAEA.96528
  76. Melles, M (1991): Bulk parameter of sediment core PS1498-2. https://doi.org/10.1594/PANGAEA.96691
  77. Melles, M (1991): Bulk parameter of sediment core PS1606-1. https://doi.org/10.1594/PANGAEA.96529
  78. Melles, M (1991): Bulk parameter of sediment core PS1606-3. https://doi.org/10.1594/PANGAEA.96692
  79. Melles, M (1991): Bulk parameter of sediment core PS1607-1. https://doi.org/10.1594/PANGAEA.96530
  80. Melles, M (1991): Bulk parameter of sediment core PS1607-3. https://doi.org/10.1594/PANGAEA.96693
  81. Melles, M (1991): Bulk parameter of sediment core PS1609-2. https://doi.org/10.1594/PANGAEA.96531
  82. Melles, M (1991): Bulk parameter of sediment core PS1609-3. https://doi.org/10.1594/PANGAEA.96694
  83. Melles, M (1991): Bulk parameter of sediment core PS1611-1. https://doi.org/10.1594/PANGAEA.96532
  84. Melles, M (1991): Bulk parameter of sediment core PS1611-3. https://doi.org/10.1594/PANGAEA.96695
  85. Melles, M (1991): Bulk parameter of sediment core PS1612-1. https://doi.org/10.1594/PANGAEA.96533
  86. Melles, M (1991): Bulk parameter of sediment core PS1612-2. https://doi.org/10.1594/PANGAEA.96696
  87. Melles, M (1991): Bulk parameter of sediment core PS1613-4. https://doi.org/10.1594/PANGAEA.96534
  88. Melles, M (1991): Bulk parameter of sediment core PS1613-4. https://doi.org/10.1594/PANGAEA.96697
  89. Melles, M (1991): Carbon analysis in surface sediments from the Antarctic continental slope in the Weddell Sea (Table 14). https://doi.org/10.1594/PANGAEA.633545
  90. Melles, M (1991): Clay mineralogy of sediment core PS1420-1. https://doi.org/10.1594/PANGAEA.633607
  91. Melles, M (1991): Clay mineralogy of sediment core PS1420-2. https://doi.org/10.1594/PANGAEA.633608
  92. Melles, M (1991): Clay mineralogy of sediment core PS1494-3. https://doi.org/10.1594/PANGAEA.51667
  93. Melles, M (1991): Clay mineralogy of sediment core PS1498-1. https://doi.org/10.1594/PANGAEA.633609
  94. Melles, M (1991): Clay mineralogy of sediment core PS1498-2. https://doi.org/10.1594/PANGAEA.633610
  95. Melles, M (1991): Clay mineralogy of sediment core PS1606-1. https://doi.org/10.1594/PANGAEA.633611
  96. Melles, M (1991): Clay mineralogy of sediment core PS1606-3. https://doi.org/10.1594/PANGAEA.633612
  97. Melles, M (1991): Clay mineralogy of sediment core PS1607-1. https://doi.org/10.1594/PANGAEA.633613
  98. Melles, M (1991): Clay mineralogy of sediment core PS1607-3. https://doi.org/10.1594/PANGAEA.633614
  99. Melles, M (1991): Clay mineralogy of sediment core PS1609-2. https://doi.org/10.1594/PANGAEA.633615
  100. Melles, M (1991): Clay mineralogy of sediment core PS1609-3. https://doi.org/10.1594/PANGAEA.633616

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