Sedimentology of 2 profiles from the Scotia Sea

Geochemical and mineralogical compositions of modern and Late Quaternary marine sediments from the Scotia Sea trace sources and transport paths of terrigenous sediment. We discuss downcore variations of compositional data of two sediment cores from the northern and southern Scotia Sea that correlate...

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Bibliographic Details
Main Authors: Diekmann, Bernhard, Kuhn, Gerhard, Rachold, Volker, Abelmann, Andrea, Brathauer, Uta, Fütterer, Dieter K, Gersonde, Rainer, Grobe, Hannes
Format: Dataset
Language:English
Published: PANGAEA 2000
Subjects:
ANT-X/5
ANT-XI/2
AWI_Paleo
Gravity corer (Kiel type)
KL
MIC
MiniCorer
Paleoenvironmental Reconstructions from Marine Sediments @ AWI
Piston corer (BGR type)
Polarstern
PS22/817
PS22 06AQANTX_5
PS2319-1
PS2515-1
PS2515-3
PS28
PS28/378
Scotia Sea
southwest Atlantic
SL
Antarctic
Antarctic Peninsula
Patagonia
The Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.732966
https://doi.org/10.1594/PANGAEA.732966
Description
Summary:Geochemical and mineralogical compositions of modern and Late Quaternary marine sediments from the Scotia Sea trace sources and transport paths of terrigenous sediment. We discuss downcore variations of compositional data of two sediment cores from the northern and southern Scotia Sea that correlate with fluctuations in magnetic susceptibility. Sediments were derived from very different sources at both localities, as revealed by contrasting clay-mineral assemblages. However, a common feature is the input of more basic and undifferentiated crustal material with the potential of high magnetic susceptibility during glacial periods, indicated by variable quartz/feldspar ratios and major, trace and rare earth elements. Terrigenous sediments mainly originate from nearby terrestrial sources or are introduced through interbasinal sediment transfer from adjacent seas. The observed temporal compositional variations have to be attributed to changes in the relative detrital contributions from the diverse source areas. Ice-mass extensions in southern Patagonia, on the Antarctic Peninsula and adjacent islands likely control the supply of glaciogenic detritus to the open ocean during times of glacial expansion, diluting the sediment input of interbasinal origin. Current transport is mainly responsible for sediment dispersal to the pelagic Scotia Sea and may amplify the glaciological source signals during glacial climate periods, because of a stronger wind forcing of the Antarctic Circumpolar Current.

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