Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Viereck, L G; Simon, M; Schmincke, Hans-Ulrich (1986): Primary composition, alteration, and origin of Cretaceous volcaniclastic rocks at DSDP Site 89-585 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.797439, Supplement to: Viereck, LG et al. (1986): Primary composition, alteration, and origin of Cretaceous volcaniclastic rocks, East Mariana Basin (Site 585, Leg 89). In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 529-553, https://doi.org/10.2973/dsdp.proc.89.121.1986

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
An upper Aptian to middle Albian series of volcaniclastic rocks more than 300 m thick was drilled at Site 585 in the East Mariana Basin. On the basis of textural and compositional (bulk-rock chemistry, primary and secondary mineral phases) evidence, the volcaniclastic unit is subdivided into a lower (below 830 m sub-bottom) and an upper (about 670-760 m) sequence; the boundary in the interval between is uncertain owing to lack of samples. The rocks are dominantly former vitric basaltic tuffs and minor lapillistones with lesser amounts of crystals and basaltic lithic clasts. They are mixed with shallow-water carbonate debris (ooids, skeletal debris), and were transported by mass flows to their site of deposition.
The lower sequence is mostly plagioclase- and olivine-phyric with lesser amounts of Ti-poor clinopyroxene. Mineralogical and bulk-rock chemical data indicate a tholeiitic composition slightly more enriched than N-MORB (normal mid-ocean ridge basalt). Transport was by debris flows from shallow-water sites, as indicated by admixed ooids. Volcanogenic particles are chiefly moderately vesicular to nonvesicular blocky shards (former sideromelane) and less angular tachylite with quench plagioclase and pyroxene, indicating generation of volcanic clasts predominantly by spalling and breakage of submarine pillow and/or sheet-flow lavas.
The upper sequence is mainly clinopyroxene- and olivine-phyric with minor plagioclase. The more Ti-rich clinopyroxene and the bulk-rock analyses show that the moderately alkali basaltic composition throughout is more mafic than the basal tholeiitic sequence. Transport was by turbidity currents. Rounded epiclasts of crystalline basalts are more common than in the lower sequence, and, together with the occurrence of oxidized olivine pseudomorphs and vesicular tachylite, are taken as evidence of derivation from eroded subaerially exposed volcanics. Former sideromelane shards are more vesicular than in the lower sequence; vesicularity exceeds 60 vol.% in some clasts. The dominant clastic process is interpreted to be by shallow-water explosive eruptions.
All rocks have undergone low-temperature alteration; the dominant secondary phases are "palagonite," chlorite/smectite mixed minerals, analcite, and chabazite. Smectite, chlorite, and natrolite occur in minor amounts. Phillipsite is recognized as an early alteration product, now replaced by other zeolites. During alteration, the rocks have lost up to 50% of their Ca, compared with a fresh shard and fresh glass inclusions in primary minerals, but have gained much less K, Rb, and Ba than expected, indicating rapid deposition prior to significant seafloor weathering.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 13.483300 * Longitude: 156.815200
Date/Time Start: 1982-10-18T00:00:00 * Date/Time End: 1982-10-18T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 8) Major-element compositions along profile across altered shard at DSDP Hole 89-585. https://doi.org/10.1594/PANGAEA.797435
  2. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 2) Major-element compositions of selected primary minerals: plagioclase, amphibole, mica, Ti-magnesiochromite, and Ti-magnetite at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797426
  3. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 3) Major-element compositions of representative clinopyroxenes at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797427
  4. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 4) Major-element compositions of palagonite-type altered glass shards at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797428
  5. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 5) Major-element compositions of sheet silicates at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797430
  6. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 6) Major-element compositions of representative zeolites at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797432
  7. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 7) Major-element compositions of selected secondary minerals: albite, K-feldspar, apophyllite, and gyrolite at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797433
  8. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 9) Major-element compositions of whole rock samples at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797436
  9. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 11) Major-element compositions of glass shard, glass inclusions in pyroxenes and in plagioclase at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797438
  10. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 1) Petrographic properties of studied volcanogenic sediments of Unit VI, DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797425
  11. Viereck, LG; Simon, M; Schmincke, H-U (1986): (Table 10) Trace-elements of whole rock samples at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.797437