Antarctic and Patagonian Diatom Samples from Sedimentary Cores

Approximately 3,000 samples of Mesozoic-Cenozoic diatoms were collected from sedimentary cores by the Instituto Antartico Argentino. The samples originate from lakes in the South Shetland Islands and Patagonia, and from marine piston cores in the Scotia Sea and northern Weddell Sea. Diatom assemblages primarily indicate Holocene-Late Pleistocene freshwater, brackish, and shallow marine environments.

Use Cases

• Reconstruct past salinity conditions (freshwater, brackish, marine) using diatom assemblage data.
• Correlate sediment core layers across the Scotia Sea and Weddell Sea regions using Late Mesozoic-Early Cenozoic marine diatom markers.
• Model Holocene-Late Pleistocene climate shifts in Patagonia and the Antarctic Peninsula through changes in diatom species composition.
• Analyze the geographic distribution of specific diatom taxa across the South Shetland Islands, Patagonia, and adjacent seas.

Strengths

• Approximately 3,000 individual diatom samples
• Spatial coverage includes four distinct regions: South Shetland Islands, Patagonia, Scotia Sea, and northern Weddell Sea
• Temporal coverage spans from the Mesozoic to the Cenozoic, with a focus on the Holocene-Late Pleistocene

Limitations

• Sample size of ~3,000 may be limited for high-resolution spatiotemporal modeling
• Specific sample metadata (e.g., core depth, exact coordinates, dating methods) is not detailed in the provided description
• Data recency and update frequency are unknown

Provenance

Source

Instituto Antartico Argentino Antarctic Data Base, accessed via NASA EarthData.

Collection Method

Samples obtained from sedimentary cores (lake cores and marine piston cores).

Time Range

Mesozoic to Cenozoic, with emphasis on Holocene-Late Pleistocene.

Geography

South Shetland Islands, Patagonia (southern South America), Scotia Sea, northern Weddell Sea.