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Distribution of Sr and Ca Isotopes in Fluids of Lahendong Geothermal Field

Urheber*innen

Wiegand,  Bettina A.
External Organizations;

/persons/resource/brehme

Brehme,  M.
4.1 Reservoir Technologies, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kamah,  Yustin
External Organizations;

Sauter,  Martin
External Organizations;

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14118_Wiegand et al._Distribution of Sr.pdf
(beliebiger Volltext), 503KB

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Zitation

Wiegand, B. A., Brehme, M., Kamah, Y., Sauter, M. (2015): Distribution of Sr and Ca Isotopes in Fluids of Lahendong Geothermal Field - Proceedings, World Geothermal Congress 2015 (Melbourne, Australia 2015).


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1189893
Zusammenfassung
Naturally occurring Sr and Ca isotopes can help to understand geochemical processes like mineral dissolution/precipitation and solute sources in geothermal systems. To test the potential of the two isotope systems, we conducted research in a high-temperature liquid-dominated system located in volcanic rocks in North Sulawesi (Indonesia). Fluids were collected from hot springs, shallow groundwater wells, geothermal production wells, and surface waters in the Lahendong area. The results of the investigations show that the Sr isotope compositions of the fluids vary with the source of solutes and differences in the 87Sr/86Sr ratio reflect geochemical differences of andesitic and basaltic rocks in the reservoir and at the surface. In contrast, the distribution of Ca isotopes in the fluids is largely affected by fractionation effects resulting from the precipitation of Ca-bearing mineral phases.