Start Dating tephra layers

Dating tephra layers

The word ‘tephra’ comes from the Greek ‘τέφρα’, meaning ‘ashes’, and describes the fragments of molten rock that are blasted into the air by volcanic eruptions.

layers not visible to the naked eye, but identified through microscopic analysis).

Preliminary tephra analysis of SG06 is being undertaken at the Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford and at the Department of Geography, Royal Holloway, University of London.

This paper describes and characterises the 30 visible tephra layers recorded within the SG06 core and, for the younger tephras (i.e.

Volcanic ash is decidedly not the product of organic combustion, but rather it is rock powder generated in an extremely high-powered environment where both native (surface) rocks as well as the magma connected to the eruption itself are torn asunder.

As well as providing correlation between distal sites, tephra layers can also be linked back to proximal deposits from the source volcano.

This is important because certain proximal volcanic deposits (i.e.

While the very finest volcanic particles ejected as part of volcanic eruptions can have considerable residence times in the atmosphere as aerosols, the larger particles such as rock fragments, pumice, crystals, and glass tend to fall out already during or shortly after the eruption.