Radiocarbon dating marine sediments
For example, archaeologists should now be able to pinpoint more accurately the timing of the extinction of Neanderthals or the spread of modern humans into Europe.
At the Oxford Radiocarbon Accelerator Unit, Professor Christopher Ramsey with his doctoral student Richard Staff and chemist Dr Fiona Brock worked with two other radiocarbon laboratories (the NERC facility at East Kilbride, Scotland, and Groningen in the Netherlands) on the radiocarbon record from the lake.
Cosmogenic nuclide dating is useful for directly dating rocks on the Earth’s surface.
As an article in the journal explains, the findings are hugely significant because they provide a much more precise way to examine radiocarbon ages of organic material for the entire 11,000-53,000-year time range.
Radiocarbon accelerator mass spectrometric (AMS) dates on the acid-insoluble fraction from 38 core tops from the western Ross Sea, Antarctica, are used to address these questions: (1) What are the apparent ages of sediments at or close to the present sediment/water interface?
(2) Is there a statistically significant pattern to the spatial distribution of core top ages?
and (3) Is there a “correction factor” that can be applied to these age determinations to obtain the best possible Holocene (downcore) chronologies?
Ages of core top sediments range from 2000 to 21,000 = 28) are associated with (1) different sample preparation methods, (2) different sediment recovery systems, (3) different geographic regions, and (4) within-sample lateral age variability.
Search for radiocarbon dating marine sediments:
Unconsolidated sediments contain magnetic minerals, such as those on the continental shelf and slope. The remnant magnetism of the sediment is a reflection of the earth’s palaeomagnetic field at the time of deposition.