caa a22 4500 477063896 CHVBK 20180405111407.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00192071 doi (NATIONALLICENCE)springer-10.1007/BF00192071 Retrograde mineral reactions: a heat source in the continental crust? [Elektronische Daten] [U. Haack, H. Zimmermann] Chemical reactions of water with silicates are strongly exothermic. Therefeore, retrograde metamorphism is also a strongly exothermic process and thus a potentially powerful heat source. Depending on the time scale its contribution to the terrestrial heat flow can be equivalent to, or even exceed, that of radioactive decay. During hydration mafic rocks and gneisses liberate 60 J/cm3 for each weight percent H2O they bind. It is argued that retrograde reactions constitute relatively short-lived, single or repeated episodes during crustal cooling, and that they can influence, or even strongly perturb, the geotherm during thousands to a million years. The thermal effects involved are non-trivial; they should be considered in interpretations of heat flow measurements. They could constitute the main heat source for hydrothermal mineralisations not connected with magmatic intrusions and possibly contribute to the thermal development of sedimentary basins. These effects are large enough to be one of the possible explanations for the difference between the predicted and measured heat flows at the KTB site. Springer-Verlag, 1996 Water/rock reactions nationallicence Exothermic reactions nationallicence Retrograde metamorphism nationallicence Heat source Heat flow nationallicence Hydrothermal systems nationallicence Mineralisation nationallicence KTB nationallicence Haack U. Institut für Geowissenschaften und Lithosphärenforschung der Justus-Liebig-Universität, Senckenberstr. 3, D-35390, Giessen, Germany aut Zimmermann H. Department of Chemistry, Arizona State University, 85287-1604, Tempe, AZ, USA aut Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 130-137 0016-7835 85:1<130 1996 85 531 https://doi.org/10.1007/BF00192071 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00192071 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haack U. Institut für Geowissenschaften und Lithosphärenforschung der Justus-Liebig-Universität, Senckenberstr. 3, D-35390, Giessen, Germany aut NATIONALLICENCE 700 1- Zimmermann H. Department of Chemistry, Arizona State University, 85287-1604, Tempe, AZ, USA aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 130-137 0016-7835 85:1<130 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer