Dating Volcanic Ash

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The ages of volcanic ash or lava have been obtained by thermoluraieescence (TL) dating using fine (2-11-µm) volcanic glass 6 or plagioclase feldspar 7 respectively .
Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework . . .
So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil . Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium . By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known . . .
There has been in the past several eruptions and the volcano is covered with lava, ash , etc . from such eruptions . The edifice is composed of a stratotocone called Misti 1, two stratocones designated Misti 2 and Misti 3 and a summit cone Misti 4 . In this work samples from Misti 3 have been collected for TL dating .
The volcanic material in tuff is well-suited for radiometric dating , which uses known decay rates for specific unstable isotopes to determine the age of the rock that contains that isotope . Feldspar crystals found in the tuff layers contain an unstable isotope of potassium that can be used for this dating method .
Volcanic ash is deposited downwind from its source . Ash from volcanic activity during the Pleistocene Epoch can often be dated and used as a stratigraphic marker . Lakes throughout the northwestern United States contain some of the best examples (the Mazama ash ), and one deposit in…
Volcanic ash deposits on a parked McDonnell-Douglas DC-10-30 during the 1991 eruption of Mount Pinatubo, causing the aircraft to rest on its tail .While falling ash behaves in a similar manner to snow, the sheer weight of deposits can cause serious damage to buildings and vehicles, as seen here, where the deposits were able to cause the 120 ton airliner's centre of gravity to shift .
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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 . Such an established event provides a "tephra horizon" . The premise of the technique is that each volcanic event produces ash with a unique chemical "fingerprint" that . . .
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Dating Volcanic Ash