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Alt, Jeffrey C; Bach, Wolfgang (2001): Isotopic ratios and geochemical composition of ODP Hole 176-735B minerals [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787369, Supplement to: Alt, JC; Bach, W (2001): Data report: Low-grade hydrothermal alteration of uplifted lower oceanic crust, Hole 735B: mineralogy and isotope geochemistry. In: Natland, JH; Dick, HJB; Miller, DJ; Von Herzen, RP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 176, 1-24, https://doi.org/10.2973/odp.proc.sr.176.013.2001

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Abstract:
The mineralogy and stable (O and C) and Sr isotopic compositions of low-temperature alteration phases were determined in Hole 735B gabbroic rocks in order to understand the processes of low-temperature alteration in this uplifted block of lower oceanic crust. Phyllosilicates include smectite (saponite, Mg montmorillonite, and nontronite), chlorite/smectite, chlorite, talc, and serpentine. Other phases include prehnite, albite, K-feldspar, analcite, natrolite, thompsonite, pyrite, and titanite. The low-grade mineral assemblages mainly represent zeolite facies and lower-temperature "seafloor weathering" processes. Phyllosilicates formed over a range of temperatures but may also reflect variable reaction progress. Alteration temperatures were probably somewhat greater below 1300 meters below seafloor. Mineralogy and isotopic data indicate that conditions were mostly reducing and that seawater solutions were rock dominated. Carbonates formed late from cold and generally oxidizing seawater solution, however, as seawater penetrated downward as the result of fracturing and faulting in the uppermost portion of the uplifted crustal block.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -32.723210 * Longitude: 57.266010
Date/Time Start: 1997-10-24T13:45:00 * Date/Time End: 1997-12-01T19:00:00
Event(s):
176-735B * Latitude: -32.723210 * Longitude: 57.266010 * Date/Time Start: 1997-10-24T13:45:00 * Date/Time End: 1997-12-01T19:00:00 * Elevation: -720.6 m * Penetration: 1508 m * Recovery: 865.99 m * Location: Indian Ocean * Campaign: Leg176 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 122 cores; 1003.2 m cored; 504.8 m drilled; 86.3 % 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

  1. Alt, JC; Bach, W (2001): (Table T2) Geochemical composition of phyllosilicates from ODP Hole 176-735B. https://doi.org/10.1594/PANGAEA.787366
  2. Alt, JC; Bach, W (2001): (Table T3) Geochemical composition of secondary minerals (feldspars, zeolites, prehnite) from ODP Hole 176-735B. https://doi.org/10.1594/PANGAEA.787368
  3. Alt, JC; Bach, W (2001): (Table T1) Isotopic ratios of vein minerals from ODP Hole 176-735B. https://doi.org/10.1594/PANGAEA.787365