Modern surface sediments and non-deposition in Ellis Fjord, eastern Antarctica
Titel:
Modern surface sediments and non-deposition in Ellis Fjord, eastern Antarctica
Auteur:
McMinn, A. Bloxham, J. J. Whitehead, J.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 45 (1998) nr. 4 pagina's 645-652
Jaar:
1998-08
Inhoud:
Ellis Fjord is a small, fjord-like marine embayment in the Vestfold Hills, eastern Antarctica. Modern sediment input is dominated by a biogenic diatom rain, although aeolian, fluvial, ice-rafted, slumped and tidal sediments also make a minor contribution. In areas where bioturbation is significant relict glaciogenic sediments are reworked into the fine-grained diatomaceous sediments to produce poorly sorted fine sands and silts. Where the bottom waters are anoxic, sediments remain unbioturbated and have a high biogenic silica component. Three depositional and non-depositional facies can be recognised in the fjord: an area of non-deposition around the shoreline; a relict morainal facies in areas of low sedimentation and high bioturbation; and a basinal facies in the deeper areas of the fjord.