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Hart, Stanley R; Staudigel, Hubert (1986): Alkali contents, Sr isotope and U-Th-Pb data for ocean crust vein minerals from DSDP Holes 27-261, 61-462A, and 72-516F [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.707311, Supplement to: Hart, SR; Staudigel, H (1986): Ocean crust vein mineral deposition; Rb/Sr ages, U-Th-Pb geochemistry, and duration of circulation at DSDP sites 261, 262 and 516. Geochimica et Cosmochimica Acta, 50(12), 2751-2761, https://doi.org/10.1016/0016-7037(86)90224-3

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Abstract:
Cation exchange experiments (ammonium acetate and cation resin) on celadonite-smectite vein minerals from three DSDP holes demonstrate selective removal of common Sr relative to Rb and radiogenic Sr. This technique increases the Rb/Sr ratio by factors of 2.3 to 22 without significantly altering the age of the minerals, allowing easier and more precise dating of such vein minerals. The ages determined by this technique (Site 261 - 121.4+/-1.6 m.y.; Site 462A - 105.1+/-2.8 m.y.; Site 516F - 69.9+/-2.4 m.y.) are 34, 54 and 18 m.y. younger, respectively, than the age of crust formation at the site; in the case of site 462A, the young age is clearly related to off-ridge emplacement of a massive sill/flow complex. At the other sites, either the hydrothermal circulation systems persisted longer than for normal crust (10-15 m.y.), or were reactivated by off-ridge igneous activity.
Celadonites show U and Pb contents and Pb isotopic compositions little changed from their basalt precursors, while Th contents are significantly lower. Celadonites thus have unusually high alkali/U,Th ratios and low Th/U ratios. If this celadonite alteration signature is significantly imprinted on oceanic crust as a whole, it will lead to very distinctive Pb isotope signatures for any hot spot magmas which contain a component of aged subducted recycled oceanic crust.
Initial Sr isotope ratios of ocean crust vein minerals (smectite, celadonite, zeolite, calcite) are intermediate between primary basalt values and contemporary sea water values and indicate formation under seawaterdominated systems with effective water/rock ratios of 20-200.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -14.398462 * Median Longitude: 72.235813 * South-bound Latitude: -30.276500 * West-bound Longitude: -35.285000 * North-bound Latitude: 7.241700 * East-bound Longitude: 165.031700
Date/Time Start: 1972-11-17T00:00:00 * Date/Time End: 1980-03-11T00:00:00
Event(s):
27-261 * Latitude: -12.947200 * Longitude: 117.892700 * Date/Time: 1972-11-17T00:00:00 * Elevation: -5667.0 m * Penetration: 579.5 m * Recovery: 120.5 m * Location: Indian Ocean//PLAIN * Campaign: Leg27 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 36 cores; 323 m cored; 9.5 m drilled; 37.3 % recovery
61-462A * Latitude: 7.241700 * Longitude: 165.031700 * Date/Time: 1978-06-09T00:00:00 * Elevation: -5177.0 m * Penetration: 1068.5 m * Recovery: 344 m * Campaign: Leg61 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 90 cores; 619.5 m cored; 14.5 m drilled; 55.5 % recovery
72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery
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. Hart, SR; Staudigel, H (1986): (Table 1) Alkali contents and Sr isotope data for vein minerals from DSDP Hole 61-462A. https://doi.org/10.1594/PANGAEA.707286
  2. Hart, SR; Staudigel, H (1986): (Table 2) Rb and Sr content and isotope data for vein minerals from DSDP Hole 27-261. https://doi.org/10.1594/PANGAEA.707294
  3. Hart, SR; Staudigel, H (1986): (Table 3) Alkali contents and Sr isotope data for basalts and vein minerals from DSDP Hole 72-516F. https://doi.org/10.1594/PANGAEA.707295
  4. Hart, SR; Staudigel, H (1986): (Table 4) U-Th-Pb data for ocean crust vein minerals from DSDP Holes 27-261 and 72-516F. https://doi.org/10.1594/PANGAEA.707307