Download e-book for kindle: Lectures in Isotope Geology by Emilie Jäger (ed.), Johannes C. Hunziker (ed.)

Download e-book for kindle: Lectures in Isotope Geology by Emilie Jäger (ed.), Johannes C. Hunziker (ed.)

By Emilie Jäger (ed.), Johannes C. Hunziker (ed.)

Our colleagues from the French-speaking elements of Switzerland - the Suisses romands - and chiefly the committee of the third Cycle, e Earth Sciences (3 Cycle, Sciences de los angeles Terre) commemorated us by means of asking us to provide a direction on Isotope Geology for the 12 months 1977. The direction, entitled review et Interpretation des Donnees Isotopiques (eval­ uation and Interpretation of Isotopic Data), was once meant to notify earth scientists, graduate and postgraduate, from the western Swiss Universities with regards to Isotope Geology. Such classes often encompass components: lectures and tours. hence, in March 1977, we gave any such two-week path on the Miner­ alogical Institute of the college of Berne. the 1st week used to be dedicated primarily to the equipment of relationship, the second one week to the habit of strong isotopes. In July 1977, at the party of an expedition to the valuable and Western Alps, we have been in a position to exhibit our effects. visitor professors have been invited to contribute to the course.

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7). ). 0002); this difference is logical since the four analyzed smectites are continental and remain in their environment. Additional examples of isochrons formed with the points of the rock, the glauconite and the associated clay have been obtained (Clauer, 1976). In all these cases, it can be considered that an isotopical bond exists between the glauconites and the clays, and therefore the intercepts of the isochrons are always slightly different than the value of the 87/86 ratio of the contemporary common strontium.

0004. This age is in good agreement with the stratigraphy, since these azoic sediments are covered by dated Eocene. The line is probably an isochron whose points represent detrital, transformed, and recrystallized material dating the end of the smectite transformation and the end of the attapulgite recrystallization. 0002, respectively. /* 20 24 [87 Sr/ 8 6 Sr; 87 28 36 86 Sr 87 Rb **/ Rb/ 8 6 Sr] diagram 32 detrital smectite transformed smectite attapulgite &smectite attapulgite carbonate --+-analytical error A * 0 () • ~ " ,.

In this domain, the illite polymorph is normally of 2M type. g/g strontium. This amount is consistent with a metamorphic recrystallization. The flne fractions, except one, and some whole rocks give an isochron with an age corresponding to the tectono-metamorphic event which affected the sequence (Fig. 12). 0026. The geochronological study of whole rocks is not suitable even in slightly metamorphosed sedimentary formations. Indeed, the scattered representative points of the whole rocks above the isochron (Fig.

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