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Schmincke, Hans-Ulrich (1983): Ash layers, hyaloclastite, and alteration of basaltic glass at DSDP Leg 65 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818021, Supplement to: Schmincke, H-U (1983): Ash layers, hyaloclastite, and alteration of basaltic glass, Leg 65. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 477-483, https://doi.org/10.2973/dsdp.proc.65.121.1983

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Abstract:
Three types of tephra deposits were recovered on Leg 65 of the Deep Sea Drilling Project (DSDP) from three drill sites at the mouth of the Gulf of California: (1) a series of white ash layers at Sites 483, 484, and 485; (2) a layer of plagioclase- phyric sideromelane shards at Site 483; and (3) an indurated, cross-bedded hyaloclastite in Hole 483B.
The ash layers in (1) are composed of colorless, fresh rhyolitic glass shards with minor dacitic and rare basaltic shards. These are thought to be derived from explosive volcanoes on the Mexican mainland.
Most of the shards in (2) are fresh, but some show marginal to complete alteration to palagonite. The composition of the glass is that of a MORB-type tholeiite, low in Fe and moderately high in Ti, and possibly erupted from off-axis seamounts. Basaltic glass shards occurring in silt about 45 meters above the basement at Site 484 A in the Tamayo Fracture Zone show a distinctly alkalic composition similar to that of the single basement basalt specimen drilled at this site.
The hyaloclastite in (3) is made up chiefly of angular sideromelane shards altered to smectite and zeolites (mainly phillipsite) and minor admixtures of terrigenous silt. A very high K and Ba content indicates significant uptake of at least these elements from seawater. Nevertheless, the unusual chemical composition of the underlying massive basalt flow is believed to be reflected in that of the hyaloclastite. This is a powerful argument for interpreting the massive basalt as a surface flow rather than an intrusion.
Glass alteration is different in the glassy margins of flows than in thicker glassy pillow rinds. Also, it appears to proceed faster in coarse- than fine-grained sediments.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 22.874070 * Median Longitude: -108.407825 * South-bound Latitude: 22.748700 * West-bound Longitude: -108.748300 * North-bound Latitude: 23.185800 * East-bound Longitude: -107.903500
Date/Time Start: 1979-02-12T00:00:00 * Date/Time End: 1979-03-05T00:00:00
Event(s):
65-483 * Latitude: 22.883300 * Longitude: -108.748300 * Date/Time: 1979-02-12T00:00:00 * Elevation: -3070.0 m * Penetration: 204.5 m * Recovery: 110.7 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 204.5 m cored; 0 m drilled; 54.1 % recovery
65-483B * Latitude: 22.883200 * Longitude: -108.747300 * Date/Time: 1979-02-12T00:00:00 * Elevation: -3070.0 m * Penetration: 267 m * Recovery: 91.8 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 160.5 m cored; 28.5 m drilled; 57.2 % recovery
65-483C * Latitude: 22.883000 * Longitude: -108.743000 * Date/Time: 1979-02-12T00:00:00 * Elevation: -3070.0 m * Penetration: 114 m * Recovery: 26.2 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 37.5 m cored; 0 m drilled; 69.8 % 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. Schmincke, H-U (1983): (Table 3) Bulk chemical composition of indurated hyaloclastite from DSDP Hole 65-483B and nonvolcanic marls and sandstones from DSDP Hole 65-485A. https://doi.org/10.1594/PANGAEA.818019
  2. Schmincke, H-U (1983): (Table 4) Composition of fresh and altered glass from a pillow margin and the base of a massive flow at DSDP Hole 65-483B. https://doi.org/10.1594/PANGAEA.818020
  3. Schmincke, H-U (1983): (Table 1) Abundance, refractive indices, color, and shape of glass shards in ash layers from DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818017
  4. Schmincke, H-U (1983): (Table 2) Chemical composition of rhyolitic and basaltic shards from ash layers at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818018