Ransom, Barbara; Spivack, Arthur J; Kastner, Miriam (1995): Stable chlorine isotopes in pore waters from DSDP Hole 79-546 and ODP Hole 131-808C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712358, Supplement to: Ransom, B et al. (1995): Stable Cl isotopes in subduction-zone pore waters: Implications for fluid-rock reactions and the cycling of chlorine. Geology, 23(8), 715-718, https://doi.org/10.1130/0091-7613(1995)023%3C0715:SCIISZ%3E2.3.CO;2
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Abstract:
Stable Cl isotope ratios, measured in marine pore waters associated with the Barbados and Nankai subduction zones, extend significantly (to ~-8 per mil) the range of d37Cl values reported for natural waters. These relatively large negative values, together with geologic and chemical evidence from Barbados and Nankai and recent laboratory data showing that hydrous silicate minerals (i.e., those with structural OH sites) are enriched up to 7.5 per mil in 37Cl relative to seawater, strongly suggest that the isotopic composition of Cl in pore waters from subduction zones reflects diagenetic and metamorphic dehydration and transformation reactions. These reactions involve clays and/or other hydrous silicate phases at depth in the fluid source regions. Chlorine therefore cannot be considered geochemically conservative in these systems. The uptake of Cl by hydrous phases provides a mechanism by which Cl can be cycled into the mantle through subduction zones. Thus, stable Cl isotopes should help in determining the extent to which Cl and companion excess volatiles like H2O and CO2 cycle between the crust and mantle.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 33.065650 * Median Longitude: 62.690000 * South-bound Latitude: 32.352800 * West-bound Longitude: -9.564300 * North-bound Latitude: 33.778500 * East-bound Longitude: 134.944300
Date/Time Start: 1981-05-01T00:00:00 * Date/Time End: 1990-05-02T14:40:00
Event(s):
79-546 * Latitude: 33.778500 * Longitude: -9.564300 * Date/Time: 1981-05-01T00:00:00 * Elevation: -3958.0 m * Penetration: 192 m * Recovery: 118.4 m * Location: North Atlantic/PLATEAU * Campaign: Leg79 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 192 m cored; 0 m drilled; 61.7 % recovery
131-808C * Latitude: 32.352800 * Longitude: 134.944300 * Date/Time Start: 1990-04-16T04:00:00 * Date/Time End: 1990-05-02T14:40:00 * Elevation: -4686.0 m * Penetration: 1327 m * Recovery: 572.43 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 108 cores; 1028.5 m cored; 0 m drilled; 55.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Ransom, B; Spivack, AJ; Kastner, M (1995): (Table 1) Chlorine isotope values of marine pore waters from DSDP Hole 79-546. https://doi.org/10.1594/PANGAEA.712357
- Ransom, B; Spivack, AJ; Kastner, M (1995): (Table 1) Chlorine isotope values of marine pore waters from ODP Hole 131-808C. https://doi.org/10.1594/PANGAEA.712356