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

By Günter Buntebarth, Lajos Stegena

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Additional resources for Paleogeothermics: Evaluation of Geothermal Conditions in the Geological Past (Lecture Notes in Earth Sciences) (German Edition)

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The problem arises because water, being mobile, migrates up- and downward through layers, and the d i s solved s i l i c a or Na/K r e f l e c t s f i r s t the temperature-differences caused by the mi- gration process; these geothermometers are therefore used f o r the determination of the "basic-temperature". In very special cases only, i f water migration is excluded or exactly known, s i l i c a and K/Na geothermometers can be used f o r paleogeothermometry. 29 KHARAKA et a l . (1980) have reported 180 isotopic analyses from subsurface waters from a well of Brazoria County, Texas.

R. of Germany Abstract The best available isotope thermometers of the elements oxygen, s u l f u r , carbon and hydrogen are summarized, and some applications to metamorphic rocks, to s u l f i d e ore deposits and to geothermal systems are discussed. Whether or not isotope geothermometers are generally applicable depends whether or not isotope e q u i l i b r i u m is established, and i f the existence of isotope e q u i l i b r i u m may be recognized. An inherent danger is the tendency to regard calculated temperatures as estimates of peak thermal conditions.

The degree of rank increases with depth (the "rank gradient") commonly r e f l e c t s the maximum geothermal gradient which was active in a certain p r o f i l e and area. Palaeogeothermal gradients may be estimated from c o a l i f i c a t i o n gradients (measured in deep boreholes) i f the b u r i a l h i s t o r y (m/Ma) is known. In the subvariscan foredeep of the Ruhr Basin, c o a l i f i c a t i o n was completed before the Permian, due to the Asturian f o l d i n g and u p l i f t . The c o a l i f i c a t i o n gradients are one order of magnitude higher ( 0 , 5 - 1,0 % Rm/km) than in the foredeeps of the northern Alps and the northern Apennines ( 0 , 0 3 - 0 , 0 9 % Rm/km), although the depths of b u r i a l and the duration of heat exposure were s i m i l a r .

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