Tephrochronology absolute dating


22-May-2019 01:23

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Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! Such an established event provides a "tephra horizon".

Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed.

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Tephra horizons provide a synchronous check against which to correlate the palaeoclimatic reconstructions that are obtained from terrestrial records, like fossil pollen studies (palynology), from varves in lake sediments or from marine deposits and ice-core records, and to extend the limits of carbon-14 dating.

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Tephrochronology requires accurate geochemical fingerprinting (usually via an electron microprobe).

Early tephra horizons were identified with the Saksunarvatn tephra (Icelandic origin, ca 10.2 cal.The premise of the technique is that each volcanic event produces ash with a unique chemical "fingerprint" that allows the deposit to be identified across the area affected by fallout.



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