40Ar/39Ar dating in paleoanthropology and archeology

Deino, Alan L.; Renne, Paul R.; Swisher, Carl C.

doi:10.1002/(sici)1520-6505(1998)6:2<63::aid-evan4>3.0.co;2-x

Cited by 28 publications

(8 citation statements)

References 49 publications

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“…Newer, slightly higher values for atmospheric 40 Ar/ 36 Ar have recently been made available (Lee et al, 2006;Valkiers et al, 2010), but these have not yet been universally adopted by the 40 Ar/ 39 Ar dating community and would have negligible impact on the calculated ages in this context (Renne et al, 2009). Additional details of the total-fusion feldspar dating methodology as applied at BGC are provided elsewhere (Deino and Potts, 1990;Best et al, 1995;Deino et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

40Ar/39Ar dating of Bed I, Olduvai Gorge, Tanzania, and the chronology of early Pleistocene climate change

Deino

2012

Journal of Human Evolution

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119

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Section: Methodsmentioning

confidence: 99%

40Ar/39Ar dating of Bed I, Olduvai Gorge, Tanzania, and the chronology of early Pleistocene climate change

Deino

2012

Journal of Human Evolution

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119

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“…Bulk mineralogy was obtained from X-ray diffraction using standard techniques. Anorthoclase and sanidine phenocryst concentrates from several tuff beds (ignimbrites, air-fall tuffs, and reworked tuffs) and one lava flow were dated by the laser total-fusion (Deino and Potts, 1990;Deino et al, 1998) and laser (CO 2 ) incremental-heating 40 Ar/ 39 Ar dating methods (Sharp and Deino, 1996). Silicic pyroclastic deposits in the profile allow an evaluation of lake alkalinity by means of the state of alteration of volcanic glass and the presence of authigenic silicates (Utada, 1966;Surdam and Sheppard, 1978).…”

Section: Methodsmentioning

confidence: 99%

Response of the East African climate to orbital forcing during the last interglacial (130–117 ka) and the early last glacial (117–60 ka)

Trauth

Deino

Strecker

2001

Geol

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Variations in the temporal and spatial distribution of solar radiation caused by changes in Earth's orbit provide a partial explanation for observed long-term fluctuations in African lake levels. The understanding of causal links between insolation changes and lakelevel fluctuations is essential for the design of models predicting future changes in the hydrological budgets and water supply in Africa. Here we present a record of climate change in East Africa between 175 and 60 ka. This time span includes the last interglacial (the Eemian, 130-117 ka), which may provide the closest analogue to the present interglacial. Assessments of the nature and timing of East African climate changes are based on lake-level fluctuations of Lake Naivasha (Kenya) inferred from sediment characteristics, diatom assemblages, and 40 Ar/ 39 Ar dating. Our results show dramatic alternation between deep, freshwater and shallow, highly alkaline lake conditions. The Lake Naivasha record demonstrates that periods of increased humidity in East Africa mainly follow precessional insolation forcing in spring, causing more intense April-May rains every 23 k.y.

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“…La demi-vie de 40 K étant de (1,251 ±0,003) 10 9 ans 1 , la méthode a longtemps été appliquée au volcanisme ancien. Son utilisation pour l'archéologie est relativement récente et elle est liée à l'amélioration des spectromètres de masse dans les années 1990 et à l'affinement des protocoles de préparation et d'étude des échantillons (Deino et al, 1998). Il est ainsi possible de dater indirectement par cette méthode des dépôts sédimentaires contenant des minéraux volcaniques.…”

Section: Datation Par La Filiation 40 K-40 Arunclassified

Dater, une histoire qui date !

Guibert¹

2018

archeosciences

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Nous tentons dans cet article de présenter l’évolution des méthodes physiques de datation au cours des dernières décennies en mettant en lumière les facteurs qui ont été à l’origine de cette évolution. Nous en présentons les conséquences sur la pratique de la datation et sur l’évolution des problématiques de la datation en archéologie. Ainsi, nous avons passé en revue trois types de méthodes selon le mode d’enregistrement du temps : 1) variations de paramètres environnementaux : dendrochronologie et archéomagnétisme ; 2) filiation radioactive : datation par les isotopes cosmogéniques, dont le radiocarbone, et datation par accumulation d’isotopes fils : potassium-40 et déséquilibre des séries de l’uranium (238U-234U-230Th) ; 3) accumulation de charges déplacées par l’irradiation : méthodes paléodosimétriques dont la datation par luminescence et par résonance paramagnétique électronique. Selon les cas, nous évoquons des défis pour les années futures.

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40Ar/39Ar dating in paleoanthropology and archeology

Cited by 28 publications

References 49 publications

40Ar/39Ar dating of Bed I, Olduvai Gorge, Tanzania, and the chronology of early Pleistocene climate change

40Ar/39Ar dating of Bed I, Olduvai Gorge, Tanzania, and the chronology of early Pleistocene climate change

Response of the East African climate to orbital forcing during the last interglacial (130–117 ka) and the early last glacial (117–60 ka)

Dater, une histoire qui date !

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