Burns, Stephen J; Swart, Peter K; Baker, Paul A (1990): Geochemistry of secondary carbonates in ODP Leg 115 basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.755765, Supplement to: Burns, SJ et al. (1990): Geochemistry of secondary carbonates in Leg 115 basalts: tracers of basalt/seawater interaction. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 93-101, https://doi.org/10.2973/odp.proc.sr.115.183.1990
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Abstract:
This report presents the results of a study of the stable isotopic and chemical composition of secondary carbonate minerals precipitated within basalts at Ocean Drilling Program Sites 707 and 715. At Site 715, the secondary carbonates are all composed of calcite and display a narrow range of carbon and oxygen stable isotope ratios, with values ranging from -2.75 per mil to 1.95 per mil PDB and -0.27 per mil to 2.86 per mil PDB, respectively. Strontium, iron, and manganese values of the samples are generally low. The geochemistry of Site 715 samples indicates that they precipitated from seawater-domi- nated fluids, at low temperatures, as is typical of secondary carbonates from most Deep Sea Drilling Project sites.
In contrast, at Site 707, aragonite, siderite, and manganese-rich calcite occur as secondary carbonates in addition to calcite. The carbon isotopes of the Site 707 carbonates of all rock types are depleted in 13C. Values range from -2.79 per mil to -16.43 per mil PDB. Oxygen isotope values do not show a wide variation, ranging from -1.78 per mil to 1.17 per mil. The strontium contents of the samples range from 5200 to 8100 ppm for aragonites, and from 145 to 862 ppm for calcites. Iron and manganese contents are high in calcites and siderites and low in aragonites. Site 707 carbonates precipitated at low temperatures in a fairly closed system, in which basalt-seawater interaction has greatly influenced the chemistry of the pore fluids. The reactions occurring within the system before and in conjunction with secondary carbonate precipita- tion include oxidation of isotopically light methane, derived from fluids circulating within the basalts, and reduction of substantial amounts of iron and manganese oxides from the basalts.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -1.231900 * Median Longitude: 66.424050 * South-bound Latitude: -7.545300 * West-bound Longitude: 59.016800 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-05-29T10:30:00 * Date/Time End: 1987-06-28T07:45:00
Event(s):
115-707C * Latitude: -7.545300 * Longitude: 59.016800 * Date/Time Start: 1987-05-29T10:30:00 * Date/Time End: 1987-06-02T03:30:00 * Elevation: -1552.0 m * Penetration: 443.2 m * Recovery: 91.56 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 259.4 m cored; 0 m drilled; 35.3 % recovery
115-715A * Latitude: 5.081500 * Longitude: 73.831300 * Date/Time Start: 1987-06-24T16:00:00 * Date/Time End: 1987-06-28T07:45:00 * Elevation: -2273.0 m * Penetration: 287.8 m * Recovery: 137.62 m * Location: Lakshadweep Sea * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 287.8 m cored; 0 m drilled; 47.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Burns, SJ; Swart, PK; Baker, PA (1990): (Table 1) Mineralogy and geochemistry of samples from ODP Holes 115-707C and 115-715A. https://doi.org/10.1594/PANGAEA.755763
- Burns, SJ; Swart, PK; Baker, PA (1990): (Table 2) Estimated foramtion temperatures of secondary carbonates of ODP Holes 115-707C and 115-715A. https://doi.org/10.1594/PANGAEA.755764