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Schmincke, Hans-Ulrich (1983): Physical properties and geochemistry at DSDP Leg 70 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.816349, Supplement to: Schmincke, H-U (1983): Rhyolitic and basaltic ashes from the Galapagos Mounds area, Leg 70, Deep Sea Drilling Project. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 451-457, https://doi.org/10.2973/dsdp.proc.69.120.1983

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Abstract:
Ashes occurring both as distinct layers and mixed with pelagic sediments of the hydrothermal mounds lying south of the Galapagos Rift are mainly rhyolitic and basaltic. The ashes, of rhyolitic to intermediate composition, appear to belong to a calc-alkalic series and were probably derived from Plinian eruptions in Ecuador or Colombia. Basaltic ashes are made of nonvesicular sideromelane spalling shards and are of tholeiitic composition. They probably were derived locally from fault scarps. Most rhyolitic and basaltic glass shards studied are fresh except for hydration of the rhyolitic shards. Some shards are severely altered, however. Basaltic ash may be more common in pelagic sediments deposited near accretion zones and may be a source of silica and other elements released during diagenesis
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 0.882756 * Median Longitude: -86.193134 * South-bound Latitude: 0.566700 * West-bound Longitude: -86.410000 * North-bound Latitude: 1.613200 * East-bound Longitude: -86.090000
Date/Time Start: 1979-11-15T00:00:00 * Date/Time End: 1979-11-29T00:00:00
Event(s):
70-506D * Latitude: 0.607000 * Longitude: -86.091300 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2707.0 m * Penetration: 31.9 m * Recovery: 29.2 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 31.9 m cored; 0 m drilled; 91.6 % recovery
70-507D * Latitude: 0.566700 * Longitude: -86.090000 * Date/Time: 1979-11-20T00:00:00 * Elevation: -2689.0 m * Penetration: 38.7 m * Recovery: 36.5 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 38.7 m cored; 0 m drilled; 94.3 % recovery
70-507F * Latitude: 0.566700 * Longitude: -86.090000 * Date/Time: 1979-11-20T00:00:00 * Elevation: -2695.0 m * Penetration: 31.3 m * Recovery: 31 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 31.3 m cored; 0 m drilled; 98.9 % 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. Schmincke, H-U (1983): (Table 3) Geochemistry of sideromelane shards from ash layers at DSDP Holes 70-507F and 70-509. https://doi.org/10.1594/PANGAEA.816348
  2. Schmincke, H-U (1983): (Table 1) Abundance and physical properties of glass shards in ashes from DSDP Leg 70 Holes. https://doi.org/10.1594/PANGAEA.816345
  3. Schmincke, H-U (1983): (Table 2) Geochemistry of rhyolitic glass shards from ashes showing original and recalculated analyses at DSDP Leg 70 Holes. https://doi.org/10.1594/PANGAEA.816346