Tephrochronology absolute dating
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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.
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.
Thus, once the volcanic event has been independently dated, the tephra horizon will act as time marker.
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The use of tephra layers as a chronological tool (tephrochronology) was originally developed in Iceland (Thorainsson, 1944) and has since been applied to other volcanically active areas such as Alaska, New Zealand and Mexico.
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.Tephrochronology requires accurate geochemical fingerprinting (usually via an electron microprobe).