Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence

Details Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.303...84u&link_type=abstract

Earth and Planetary Science Letters, Volume 303, Issue 1-2, p. 84-96.

Other

2

Scientific paper

Southwest Turkey is seismically active as a result of the Hellenic subduction process in the Eastern Mediterranean. We conducted high-resolution micro-sampling, high-precision U-series dating and microchemical analysis on an extensional vein system in a tectonically active but non-hydrothermal area. U/Th age data and microscopic observations provide evidence of repeated fracturing of a previously sealed crack system followed by a new increment of veining. Repeated injection of veinlets suggests that the vein system was formed by the crack-seal mechanism. Four major U/Th age groups for the emplacement of the vein system fall between 23.9 ± 0.2 ka and 23.2 ± 0.4 ka, 21.7 ± 0.4 ka and 19.2 ± 0.2 ka, 17.3 ± 0.1 ka and 16.2 ± 0.3 ka, and at 11.8 ± 0.2 ka. Stable and Sr isotope geochemistry of the calcite vein samples indicates that surface water interacting with the soil cover was the major component of the groundwater system from which the extensional veins precipitated. Trace element and O isotope data of the vein system are interpreted to reflect carbonate precipitation associated with seismic cycles involving fluids with different trace element compositions and CO2 contents. Initial carbonate precipitation during a single seismic cycle occurred from CO2-dominated fluids that were degassed from the original CO2-water mixture. This was followed consecutively by carbonate precipitation from the remaining water, which was relatively impure with higher trace element contents. Millimetre to submillimetre-scale U-series dating in conjunction with geochemistry of carbonate veins related to active tectonism offers an innovative means of constraining the absolute timing of late Quaternary seismic and inter-seismic events.

Affiliated with

Also associated with

No associations

Rating

Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seismic cycles recorded in late Quaternary calcite veins: Geochronological, geochemical and microstructural evidence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1119595