Fission track dating - Wikipedia
In this work the fission-track dating method was applied for the identification of the the Late Chalcolithic levels of the Tell Afis archaeological site (north- western Syria). This result confirms the need of further field work aimed to enhance. Fission track dating is a radiometric dating technique based on analyses of the damage trails, The fission track method has also been used to date archaeological sites and artifacts. It was used to confirm the potassium-argon dates for the. We dated by the fission track method eighteen samples of obsidian glass. Of these, seventeen were artefacts collected in prehispanic archaeological sites from.
The lithic from the levels consists of flints and obsidian artefacts 90 blades, 60 flakes and 7 coresrespectively. Among the several approaches experimented since early 60's, the chemical analysis of major and trace elements appears the most popular technique for characterization of obsidian sources and correlation of artefacts with them. Since early 70 's also the fission-track FT dating method had been proposed for this purpose Durrani et ah, ; [Note: Location of obsidian bearing volcanics of the Near East recently studied.
Correlations of obsidian artefacts from Tell Afis with natural sources are also shown 3. Correlations of obsidian artefacts from Tell Afis with natural sources are also shown.
Localisation des obsidiennes du Nord-Est. Views of the Late Chalcolithic wall of Tell Afis. Vues des murs du Chalcolithique tardif du site de Tell Afis.
Application in various regions of Earth, including the Near East, proved the potentiality of this approach Bellot-Gurlet et al, ; Badalian et al, As FT dating is based on different parameters, this method turned to be an efficient complementary especially in case of dubious source identification.
Fission track dating
The resulting induced fission of the uranium in the sample creates induced tracks in the overlying external detector, which are later revealed by chemical etching.
The ratio of spontaneous to induced tracks is proportional to the age. Another method of determining uranium concentration is through LA-ICPMS, a technique where the crystal is hit with a laser beam and ablated, and then the material is passed through a mass spectrometer. Applications[ edit ] Unlike many other dating techniques, fission-track dating is uniquely suited for determining low-temperature thermal events using common accessory minerals over a very wide geological range typically 0.
Apatitesphenezirconmicas and volcanic glass typically contain enough uranium to be useful in dating samples of relatively young age Mesozoic and Cenozoic and are the materials most useful for this technique. Additionally low-uranium epidotes and garnets may be used for very old samples Paleozoic to Precambrian.
The fission-track dating technique is widely used in understanding the thermal evolution of the upper crust, especially in mountain belts. Fission tracks are preserved in a crystal when the ambient temperature of the rock falls below the annealing temperature. This annealing temperature varies from mineral to mineral and is the basis for determining low-temperature vs. Because heating of a sample above the annealing temperature causes the fission damage to heal or anneal, the technique is useful for dating the most recent cooling event in the history of the sample.
Thermal annealing is reflected by a shortening of the track length. Combination of these track length measurements and age determination of a mineral sample will therefore yield information on its thermal history.
For fission tracks in apatite this process is well understood and quantified. Computer models have been developed to reconstruct thermal histories from observed apatite FT data. In this way Aapatite FT analysis has become an important and successful tool in low-temperature thermochronology and during the last decade it became applied in numerical tectonic modeling, assessing tectonic hazards, landscape development, tectonic geomorphology, dating processes of mountain building, hydrocarbon exploration, sedimentary burial history, and much more.
Equipment Mineral separations are done using conventional magnetic and heavy liquid techniques. Mounting of the samples is done in epoxy resin, whereafter they are subjected to a sequence of grinding and polishing steps with diamond pastes down to 0. For track counting and measuring, Olympus BH2 microscopes equipped with transmitted and reflected light, are used carrying a drawing tube attachment overlooking a high resolution digitising tablet. Self-developed software for counting and measuring the tracks and for data analysis is used.
From on, track sizes will be measured from pictures taken with a digital camera and using an image analysis program. Research areas and perspectives Methodological Introducing the Q-factor, an absolute neutron fluence calibrated factor for use in the external detector method of FT dating.
Low-temperature thermochronology and denudational history of the Altai Mountains, South Siberia, Russia.
Fission track dating
Low-temperature thermochronology and cooling history of the Kazakhstan shield, Central Asia. View of the research areas: De absolute ouderdomsbepaling van apatiet gebaseerd op uranium-fissiesporen: Universiteit Gent, p.
Van den haute, P.