Title: Origin of palaeofluids in a normal fault setting in the Aegean region
Authors: Verhaert, Griet
Muchez, Philippe ×
Sintubin, Manuel
Similox-Tohon, Dominique
Vanidycke, S
Keppens, F
Hodge, FJ
Richards, DA #
Issue Date: 2004
Publisher: Blackwell publ ltd
Series Title: Geofluids vol:4 issue:4 pages:300-314
Abstract: The province of Burdur (SW Turkey) is seismically an active region. A structural, geochronological, petrographical, geochemical and fluid inclusion study of extension veins and fault-related calcite precipitates has been undertaken to reconstruct the palaeofluid flow pattern in this normal fault setting in the Aegean region. A palaeostress analysis and U/Th dating of the precipitates reveals the neotectonic significance of the sampled calcites. Fluid inclusion microthermometry of calcites-filling extension veins shows final melting temperatures (T-m ice) of 0degreesC. This indicates pure water, most likely of meteoric origin. The oxygen isotope values (-9.8parts per thousand to -6.5parts per thousand VPDB) and the carbon isotopic composition (-10.4parts per thousand to -2.9parts per thousand VPDB) of these calcites also show a near-surface meteoric origin of the fluid responsible for precipitation. The microstructural characteristics of fault-related calcites indicate that calcite precipitation was linked with fault activity. Final melting temperature of fault-related calcites ranges between 0 and -1.9degreesC. The oxygen isotope values show a broad range between -15.0parts per thousand and -2.2parts per thousand VPDB. Several of these calcites have a delta(18)O composition that is higher or lower than the oxygen isotopic composition of meteoric calcites in the area (i.e. between -10parts per thousand and -6parts per thousand VPDB). The delta(13)C Composition largely falls within the range of the host limestones and reflects a rock-buffered system. Microthermometry and stable isotopic study indicate a meteoric origin of the fluids with some degree of water-rock interaction or mixing with another fluid. Temperatures deduced from microthermometry and stable isotope analyses indicate precipitation temperatures around 50degreesC. These higher temperatures and the evidence for water-rock interaction indicate a flow path long enough to equilibrate with the host-rock limestone and to increase the temperature.
ISSN: 1468-8115
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
× corresponding author
# (joint) last author

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