U-series dating of impure carbonates: An isochron technique using total-sample dissolution

Bischoff, James L.; Fitzpatrick, Joan

doi:10.1016/0016-7037(91)90011-s

Cited by 236 publications

(134 citation statements)

References 18 publications

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“…Dans ce dernier, on a supposé que les différents échan-tillons analysés avaient strictement le même âge, mais que la proportion de 230 Th détritique présente dans chacun d'entre eux était différente. Cette correction, appelée méthode des "isochrones", a été discutée et appliquée par différents auteurs, en particulier Schwarcz et Latham (1989) et Bischoff et Fitzpatrick, (1990).…”

Section: -Résultats Et Discussionunclassified

Datation par les séries de l'Uranium des occupations moustériennes de la grotte de Teixoneres (Moia, Province de Barcelone, Espagne)

Tissoux¹,

Falguères²,

Bahain³

et al. 2006

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Section: -Résultats Et Discussionunclassified

Datation par les séries de l'Uranium des occupations moustériennes de la grotte de Teixoneres (Moia, Province de Barcelone, Espagne)

Tissoux¹,

Falguères²,

Bahain³

et al. 2006

quaternaire

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“…Todas las muestras se trataron por el método de ataque y disolución total (Talvitite, 1972;Bischoff y Fitzpatrick, 1991). Las determinaciones isotópicas se realizaron por espectrometría de radiación alfa y para el cálculo de las edades se utilizó el algoritmo propuesto por Rosenbauer (1991).…”

Section: Métodos Analíticosunclassified

Untitled

Fortea¹,

Rasilla²,

Martínez³

et al. 2003

Estud. geol.

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Se exponen los resultados preliminares de las excavaciones arqueológicas llevadas a cabo en la Cueva de El Sidrón entre 2000 y 2002, de acuerdo con los tres objetivos principales que conciernen al registro fósil humano: las características antropológicas, cómo y cuándo llegaron allí y la relación entre fósiles y cultura. Las primeras conclusiones obtenidas son que los restos humanos pertenecen al Neandertal, que el registro arqueológico corresponde a un tecno-complejo del Paleolítico Medio y que están en posición secundaria.Palabras clave: Paleolítico medio, Neandertal, geomorfología y sedimentología kárstica, cronometría: paleomagnetismo, U/Th, ARRD, Asturias. ABSTRACTWe expose the preliminary results ofthe archaeological excavations developed between 2000-2002 in Sidrón's Cave, according to the three main objectives that concern the human fossil record: the anthropological characteristics, how and when they arrived there and the relation between fossils and culture. We conclude preliminarily that the record belongs to Horno Neanderthalensis, archeological remains to the Middle Paleolithic techno-complex, and they are in a secondary position.

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“…In the case of relatively pure CaCO3 deposits such as coral reefs and speleothems, results are often definitive (Atkinson and Harmon 1978;Harmon et al 1975;Harmon, Ford and Schwarcz 1977;Harmon, Schwarcz and Ford 1977). Travertines are also suitable subjects for dating, but must be sampled and analyzed carefully, because of their porous structures and occasional impurities (Schwarcz et a1.1979;Harmon, Glazek and Nowak 1980;Hennig, Bangert and Herr 1980;Hennig, Grun and Brunnacker 1983;Blackwell and Schwarcz 1986;Kronfeld et al 1988;Baskaran, Rajagopalan and Somayaj ulu 1989;Schwarcz and Latham 1989;Szabo 1990;Bischoff and Fitzpatrick 1991). In such cases, either closed-system conditions could be shown to apply, or the extent of contamination by older detritus could be demonstrated.…”

Section: Uranium-series Dating Of Plitvice Travertinesmentioning

confidence: 99%

Radiocarbon and Uranium-Series Dating of the Plitvice Lakes Travertines

et al. 1994

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ABSTRACT. Radiocarbon and uranium-series ages of the calcareous deposits of the Plitvice Lakes show that travertines were deposited during three warm, humid, interglacial oxygen isotope stages. According to our measurements, only calcite crystals or crystal aggregates represent reliable material for both 230Th/234U and 234U/'8U dating. Compact old travertine in the form of sandstone is less reliable; it can be dated by both methods provided that its detrital contamination is not significant, demonstrated by very low 14C activity (<1.5-2.0 pMC) and a high 230Th/232Th ratio. Old porous travertine contaminated with recent carbonates and Th-bearing clay (pMC > 5, 23°Th/232Th < 5) gives erroneous results by both methods. Stage 1(Holocene) deposition is shown primarily by 14C dating corroborated by sedimentological and palynologic studies as well as by both 230Th/ 234U and 234U/238U disequilibrium methods. The intensive growth of travertine barriers coincided with significant climate warming in the Holocene. Stage 5 deposition is confirmed by the 23oTh/234U dating of crystalline calcite aggregates embedded in the travertine matrix and by concordant 230Th/ 234U and 234U/ 238U ages, assuming that the 234U/ 238U activity ratio of 1.88 observed in modern streams and in Holocene deposits can be extended to past epochs. The travertine deposition period was very short, peaking Ca. 120 ± 10 ka BP. Stage 11 deposition is indicated by 234U/238U dating only, the period being within the 234U decay range, but not that of 230Th. Stage 11 travertine was deposited ca. 420 ± 50 ka BP. We did not find travertine samples with U-series ages indicating a growth period during relatively warm Stages 7 and 9; due to the scarcity of old travertine outcrops, these and possibly other stages cannot be excluded on the basis of presented data. All of these isotopic dating results concur with the field relation of the travertine complex of the Plitvice Lakes.

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U-series dating of impure carbonates: An isochron technique using total-sample dissolution

Cited by 236 publications

References 18 publications

Datation par les séries de l'Uranium des occupations moustériennes de la grotte de Teixoneres (Moia, Province de Barcelone, Espagne)

Datation par les séries de l'Uranium des occupations moustériennes de la grotte de Teixoneres (Moia, Province de Barcelone, Espagne)

Untitled

Radiocarbon and Uranium-Series Dating of the Plitvice Lakes Travertines

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