Antarctic Lake and Marine Sediment Core Analyses from Vestfold Hills

Sedimentological, chemical, and isotopic analyses of sediment cores from three saline lakes and two marine inlets in Antarctica's Vestfold Hills. The dataset examines characteristics like organic delta 13C values, sulfur content, and authigenic carbonate composition to infer past environmental conditions. Data was collected by the Australian Antarctic Data Centre and last updated in 1987.

Use Cases

• Reconstruct paleoenvironmental conditions by analyzing shifts in organic delta 13C values and sulfur content across core sections.
• Estimate historical meltwater input and evaporation rates using the delta 18O composition of authigenic carbonate in hypersaline lake sediments.
• Determine timing of marine isolation events, such as Highway Lake's isolation 4600 years BP, through 14C-dating of core samples.
• Identify anoxic versus oxic conditions in past lake waters by correlating strongly negative organic-delta 13C values with high sulfur contents.
• Calculate apparent emergence rates from isostatic uplift, ranging from 1.0 to 2.1 mm per year, based on 14C ages from different core layers.

Strengths

• Analysis covers five distinct sites including three lakes and two marine inlets for environmental comparison.
• Provides specific isotopic value ranges, such as organic delta 13C from -10.5 to -25.3 ppt in lacustrine sediments.
• Includes 14C-derived temporal markers for isolation events, providing a chronology for environmental changes.

Limitations

• Dataset is temporally stale, last updated in 1987, potentially lacking modern analytical techniques.
• Sample size and row count for the core analyses are unknown, limiting statistical assessment.
• The variable 'reservoir effect' of up to ~1000 years introduces uncertainty in radiocarbon age calibrations.

Provenance

Source

Australian Antarctic Data Centre (AU_AADC) via NASA EarthData.

Collection Method

Laboratory analysis of sediment cores collected from near-shore sites.

Time Range

Covers a paleoenvironmental record, with specific isolation events dated to at least 4600 and approximately 2700 years before present.

Freshness

1987-12-31

Geography

Vestfold Hills, Antarctica, specifically Highway Lake, Ace Lake, Organic Lake, Ellis Fjord, and Taynaya Bay.