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Sample, James C (2010): Stable oxygen isotopes of calcite veins in ODP Site 146-892 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786613, Supplement to: Sample, JC (2010): Stable isotope constraints on vein formation and fluid evolution along a recent thrust fault in the Cascadia accretionary wedge. Earth and Planetary Science Letters, 293(3-4), 300-312, https://doi.org/10.1016/j.epsl.2010.02.044

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Abstract:
In situ secondary ionization mass spectrometry (SIMS) analyses of oxygen isotopes in authigenic calcite veins were obtained from an active thrust fault system drilled at Ocean Drilling Program (ODP) Site 892 (44°40.4'N, 125°07.1'W) along the Cascadia subduction margin. The average d18OPDB value of all samples is -9.9 per mil and the values are the lowest of any measured in active accretionary prisms. Ranges in individual veins can be as much as 19.6 per mil. There is an isotopic stratigraphy related to the structural stratigraphy. Mean isotope values in the hanging wall, thrust, and footwall are -14.4 per mil, -9.5 per mil, and -5.2 per mil, respectively. Several veins and crosscutting vein sequences show a general trend from lower to higher d18O values over time. Isotopic and textural data indicate several veins formed by a crack-seal mechanism and growth into open fractures. The best explanation for the strong 18O depletions is periodic rapid flow from 2-3 km deeper in the prism. Relatively narrow isotopic ranges for most veins suggest that fluids were derived from a similar source depth for each episode of fluid pulse and calcite crystallization. Structural and mass balance considerations are consistent with a record preserved in the veins of ten to hundreds of thousands of years. The fluid pulses may relate to periodic large earthquake events such as those recognized in the paleoseismicity records from the Cascadia margin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 44.674079 * Median Longitude: -125.118954 * South-bound Latitude: 44.674000 * West-bound Longitude: -125.119000 * North-bound Latitude: 44.674317 * East-bound Longitude: -125.118817
Date/Time Start: 1992-11-06T00:00:00 * Date/Time End: 1992-11-17T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Sample, JC (2010): (Table 1) General characteristics and mean stable oxygen isotope ratios of caclite in ODP Site 146-892A. https://doi.org/10.1594/PANGAEA.786606
  2. Sample, JC (2010): (Table A2) Oxygen isotope ratios of ODP Site 146-892. https://doi.org/10.1594/PANGAEA.786610
  3. Sample, JC (2010): (Table A1) Comparison of oxygen isotope ratios obtained by IRMS and SIMS, ODP Site 146-892. https://doi.org/10.1594/PANGAEA.786607
  4. Sample, JC (2010): (Table A3) Oxygen isotope ratios from standards of ODP Hole 146-892D. https://doi.org/10.1594/PANGAEA.786612