Baltuck, Miriam (1986): Sediment description, CaCO3, density and porosity at DSDP Site 89-585 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.793241, Supplement to: Baltuck, M (1986): Authigenic silica in Tertiary and Upper Cretaceous sediments of the East Mariana Basin, Deep Sea Drilling Project Site 585. In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 389-398, https://doi.org/10.2973/dsdp.proc.89.111.1986
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Abstract:
Siliceous sediments and sedimentary rocks occur as chert and silicified chalk, limestone, and claystone in Site 585 lower Miocene to Campanian sediments, with one older occurrence of chert near the Cenomanian/Turonian boundary. The recovered drill breccia in the Miocene to middle Eocene interval is dominated by bright red, orange, yellow, and brown chips and fragments of chert. In early Eocene and older sediments gray silicified limestone and yellowish brown chert fragments predominate. Recovery is poor in cores with chert because chert tends to fracture into smaller pieces that escape the drill and because the hard chert fragments grind away other sediments during rotary drilling.
Thin-section and hand-sample studies show complex diagenetic histories of silicification (silica pore infill) and chertification (silica replacement of host rock). Multiple events of silicification can occur in the same rocks, producing chert from silicified limestone. Despite some prior silicification, silicified limestone is porous enough to provide conduits for dissolved silica-charged pore waters. Silicification and chert are more abundant in the coarser parts of the sedimentary section. These factors reflect the importance of porosity and permeability as well as chemical and lithologic controls in the process of silica diagenesis.
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:
3 datasets
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Datasets listed in this publication series
- Baltuck, M (1986): (Table 2) Calcium carbonate at DSDP Hole 89-585. https://doi.org/10.1594/PANGAEA.793239
- Baltuck, M (1986): (Table 3) Bulk density and porosity for silicified nannofossil limestone and chalk at DSDP Hole 89-585. https://doi.org/10.1594/PANGAEA.793240
- Baltuck, M (1986): (Table 1) Chert occurrences at DSDP Site 89-585. https://doi.org/10.1594/PANGAEA.793238