Rréférence 169.
Odin, G.S. (Rédacteur invité). 1986. Calibration of the Phanerozoic time scale, Special Issue, Chem. Geol. (Isot. Geosc. Sect.), 59 : 103-222.


A la suite de 2 symposiums internationaux co-organisés par le rédacteur, 12 contributions ont été sélectionnées. Elles portent sur les différents aspects de l'étalonnage numérique de
l'échelle des temps phanérozoïques du Primaire au Quaternaire.

Ce fichier présente:

- Couverture intérieure (voir)
- Liste des contributions (voir)
- Avant Propos (en anglais) par G.S. Odin (voir)









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Recent advances in Phanerozoic time-scale calibration
G.S. Odin (Paris, France) 103

Radiometric dating of a Caradocian tuff horizon
C.C. Rundle (London, Great Britain)

Âges radiometriques K-Ar de biotites pyroclastiques sédimentées dans le Wenlock de Gotland (Suède)
G.S. Odin, J.C. Hunziker (Berne), L. Jeppsson (Lund), N. Spjeldnaes (Oslo)
K-Ar biotite data for Ludlovian bentonites from Great-Britain
G.S. Odin (Paris), A.J. Hurford (Berne), D.J. Morrgan (London), P. Toghill (Birmingham)

U-Pb zircon dating of volcanic rocls, close to the Silurian-Devonian boundary from Vendée (France)
J.J. Peucat, F. Paris (Rennes) & M. Chalet (Poitiers)
40Ar/39Ar ages of tonstein and tuff sanidine: new calibration points for the improvement of the Upper Carboniferous time-scale
J.C. Hess & H.J. Lippolt (Heidelberg)
Contribution to the numerical calibration of the Bajocian-Bathonian boundary; K-Ar and palaeomagnetic data from the Les Vignes basaltic complex (Massif Centrl, France)
H. Bellon, A. Fabre, B. Sichler (Brest), & M.G. Bonhomme (Grenoble)
Isotopic ages of the alkali rocks from the Nemuro Group in Hokkaido, Japan: Late Cretaceous time-scale points
K. Shibata (Ibarali, Japan)
Le volcanisme du "Biarritziano" de Vénétie (Italie): Ages K-Ar sur basalte, plagioclase et céladonite
G.S. Odin, J. Hernandez, (Parsis), & J.C. Hunziher (Berne)
40Ar/39Ar laser-probe dating of North American tektite fragments from Barbados and the age of theEocene-Oligocene boundary
B.P. Glass (Newark, USA), C.M. Hall & D. York (Toronto)
40Ar/39Ar age determinations on sanidine of the Eifel volcanic field (FR Germany); constraints on age and duration of a Middle Pleistocene cold Period.
H.J Lippolt, U. Fuhrmann & H. Hradetzky ((Heidleberg)
The Cassignol technique for potassium-argon dating, precision and accuracy: examples from the Late Pleistocene to Recent volcanics from southern Italy
P.-Y. Gillot & U. Cornette (Gif-sur-Yvette, France)

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FOREWORD (Avant propos)


A major aim of the geochronology is the estimate of the numerical age of the geological events. A more specific task is the calibration of the geological relative dating expressed as a succession of stages identified in the stratigraphic sequence to which many geological works refer. Radiometric dating is the single possibility to really calibrate this sequence. Several hypothetical interpolation systems: equal stage duration, equal biozone duration, constant sedimentation rate, constant biological evolution rate, constant sea-floor spreading rate are frequently considered in order to fill up the still considerable gaps between the key points established using the radiometric dating.

The confidence level of the resulting interpolated dates remains directly related to the accuracy of the radiometrically measured points as well as to the numbers of the tie points available.

The project "Calibration of the Phanerozoic Time Scale" of the International Geological Correlation Programm (I.G.C.P., present project leaders: G. S. Odin & A. J Hurford) has been set up in order to contribute:

(1) to the improvement of the accuracy of the tie points available;
(2) to increase the number of those tie points; and
(3) to gather the knowledge in this field of research.

The present Special Issue gathers some of the recent results. Half of them were presented during the 2nd Annual Meeting of the I.G.C.P. Project (Special Symposium convened by N.H. Gale and G.S. Odin during E.U.G. III, Strasbourg, April 2, 1985); other data were presented during the 4th Annual Meeting of the I.G.C.P. Project (Special Symposium convened by G. S. Odin & N. J. Snelling during I.C.O.G. VI, Cambridge July 2, 1986). The main progess recently achieved -of which a small portion is presented here- appears to be the better understanding of the significance of the different numbers calculated using different geochronometers or different techniques; the Palaeozoic portion of the time scale is the one for which the knowlledge was easier to improve. However, more research still remains to be undertaken -especially using more sophisticated techniques and increasing the number of tie points.

I would like to thank the Authors of the herein presented contributions as well as those who contributed to the research developed in the project for their help in improving the Numerical Time Scale. I am also indebted to the publications services of Elsevier Science Publishers and the Editor-in-Chief of the Journal, Professor G. Faure, for their encouragement and help in editing this Special Issue of Isotope Geoscience.

(Rédacteur invité)

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