Abstract
δ 18O and δ 13C was analysed for calcite fissure fillings from different depths, down to 533 m, in Svecokarelian rocks of east Sweden. A significant correlation with depth is noticed for δ 18O. There also are differences between sealed and open fissure fillings in both δ 18O and δ 13C. Calcite fillings which originated in high- and low-temperature fluids have been found within single fissures. These calcites have different textures. One population of calcite has δ 18O values of −5.7 to −9.0‰ and has been precipitated by water enriched in δ 18O relative to that now present in the bedrock. Another population of calcite generally has δ 18O values of −17.0 to −19.5‰ and δ 13C values of −2.5 to −5.5‰; these calcites have been precipitated under hydrothermal conditions. A third calcite population ( δ 18 O = −9.1 to −16.9‰ ) precipitated from differentwaters at different temperatures that include present conditions. Calcites which could have been precipitated during present conditions mostly originate from open fissures.
Published Version
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