Paleogeothermics: Evaluation of Geothermal Conditions in the by Günter Buntebarth, Lajos Stegena

By Günter Buntebarth, Lajos Stegena

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G. sandstone, or in limestone deposited at a high r at e, conodonts are absent or as rare as a few examples per kilogram. In paleogeothermics, the color of the conodonts is of special i n t e r e s t . I t ranges from pale yellow, through d i f f e r e n t brown tones, to black. The c o l o r a t i o n seems to be due to the carbonization of some trace amounts of organic matter, probably amino acids as reported by PIETZNER et a l . (1968). This carbonization is e s s e n t i a l l y dependent on the temperature and on the time at which the conodonts were exposed to that e f f e c t i v e temperature.

1982, and 1982). In the W-region with lower metamorphic grade St-samples cover the temperature range between 590 and 460 ° C (upper curve), 470 and 380 ° C (lower curve). Samples which have been affected by l a t e r deformation events and show signs Aq-hm %. 03 w- re,on ~ 11+ ~ " Fig. 2. Quartz (q)-hematite (hm) f r a c t i o n a t i o n s versus calculated temperatures ( a f t e r MOLLER et a l . , 1982). The d i f f e r e n t curves have been constructed according to d i f f e r e n t laboratory c a l i b r a tions ( f o r more d e t a i l s , see also HOEFS et a l .

Within the g e o l o g i c a l l y young Cerro Prieto geothermal f i e l d , Mexico, SANFORD & ELDERS (1981) assume, corresponding with a duration of heating of 1000 to 10,000 years, 170° C as the temperature annealing of f i s s i o n tracks in d e t r i t a l a p a t i t e . With the combined a p p l i c a t i o n of both age determination techniques, the a p a t i t e f i s s i o n track and the Rb-Sr system in b i o t i t e y i e l d s in the Urach I I I borehole, southern Germany, a paleotemperature gradient of 55 to 60 ° C/km which was active during the Cretaceous period (HAMMERSCHMIDTet a l .

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