Haggerty, Janet A; Smith, Michael P (1988): Characterization of diagenetic fluids at ODP Site 103-639 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.743488, Supplement to: Haggerty, JA; Smith, MP (1988): Characterization of diagenetic fluids of the Upper Jurassic-Lower Cretaceous carbonate platform of the Galicia Margin at Ocean Drilling Program Site 639: evidence for dolomitization by hypersaline brines. In: Boillot, G; Winterer, EL; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 103, 145-153, https://doi.org/10.2973/odp.proc.sr.103.155.1988
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Abstract:
Site 639, drilled during Leg 103 of the Ocean Drilling Program, penetrated an Upper Jurassic to Lower Cretaceous carbonate platform on a tilted fault block along the Galicia margin off the northwest Iberian Peninsula. The carbonate platform is composed primarily of a sequence of dolomite overlying limestone. Samples were analyzed for mineral chemistry, stable isotope geochemistry, fluid inclusion microthermometry, and volatile contents and by dolomite pyrolysis mass spectrometry for trace sulfate minerals. The dolomite recovered from the Galicia margin at Site 639 formed during shallow burial from sulfate-bearing, hypersaline brines at slightly elevated temperatures. The light oxygen isotopic signatures of the dolomite are interpreted as the result of the evaporative loop and slightly elevated temperatures during dolomite formation or from reequilibration at higher temperatures during deeper burial. The hypersalinity is interpreted to be associated with a nearby, shallow restricted basin that formed during rifting of the Iberian margin from Newfoundland. The dolomitization of the platform is therefore a by-product of the rifting.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 42.143300 * Median Longitude: -12.252900 * South-bound Latitude: 42.143300 * West-bound Longitude: -12.255000 * North-bound Latitude: 42.143300 * East-bound Longitude: -12.248300
Date/Time Start: 1985-05-23T09:45:00 * Date/Time End: 1985-06-01T07:00:00
Event(s):
103-639A * Latitude: 42.143300 * Longitude: -12.248300 * Date/Time Start: 1985-05-23T09:45:00 * Date/Time End: 1985-05-25T23:45:00 * Elevation: -4735.0 m * Penetration: 89.8 m * Recovery: 35.72 m * Location: South Atlantic Ocean * Campaign: Leg103 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 89.8 m cored; 0 m drilled; 39.8 % recovery
103-639B * Latitude: 42.143300 * Longitude: -12.250000 * Date/Time Start: 1985-05-25T23:45:00 * Date/Time End: 1985-05-27T05:45:00 * Elevation: -4758.0 m * Penetration: 80 m * Recovery: 12.67 m * Location: South Atlantic Ocean * Campaign: Leg103 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 26.2 m cored; 0 m drilled; 48.4 % recovery
103-639C * Latitude: 42.143300 * Longitude: -12.251700 * Date/Time Start: 1985-05-27T05:45:00 * Date/Time End: 1985-05-27T19:45:00 * Elevation: -4792.0 m * Penetration: 100.4 m * Recovery: 4.84 m * Location: South Atlantic Ocean * Campaign: Leg103 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 22.4 m cored; 0 m drilled; 21.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Haggerty, JA; Smith, MP (1988): (Table 3) Homogenization temperatures of fluid inclusions from ODP Site 103-639 samples. https://doi.org/10.1594/PANGAEA.743487
- Haggerty, JA; Smith, MP (1988): (Table 1) Description, mineralogy, stable isotopic composition, and elemental concentrations from ODP Site 103-639 samples. https://doi.org/10.1594/PANGAEA.743485
- Haggerty, JA; Smith, MP (1988): (Table 2) Distribution of sulphates in ODP Site 103-639 samples. https://doi.org/10.1594/PANGAEA.743486