Pure siliceous ooze, a diagenetic environment for early chert formation

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doi: 10.1130/0091-7613(1994)022<0207:PSOADE>2.3.CO;2
Author(s): Bohrmann, Gerhard; Abelmann, Andrea; Gersonde, Rainer; Hubberten, Hans; Kuhn, Gerhard
Author Affiliation(s): Primary:
GEOMAR, Forschungszentrum für marine Geowissenschaften, Kiel, Federal Republic of Germany
Other:
Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven, Federal Republic of Germany
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 22(3), p.207-210. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 25 refs.; strat. cols., sketch map
Summary: The formation of marine opal-CT nodules or layers as early diagenetic deposits has been documented only in Antarctic deep-sea sediments. In contrast, porcellanites and cherts in land sections and Deep Sea Drilling Project and Ocean Drilling Program drill sites are usually found in sediment sections of Miocene age and older. During R.V. Polarstern cruises ANT-IX/3 and 4, young porcellanites were recovered for the first time in contact with their host sediment in two cores from the Atlantic sector of the southern ocean. Chemical and mineralogical studies of these deposits and their surrounding sediments have increased knowledge about very early chert formation. In both cores the porcellanites are embedded in sediments rich in opal-A with extremely low levels of detrital minerals, an environment that seems conducive to a rapid transformation of biogenic silica into porcellanites.
Year of Publication: 1994
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Algae; Antarctic Ocean; Antarctica; Carbon; Cenozoic; Chemical composition; Chemically precipitated rocks; Chert; Clastic rocks; Clastic sediments; Cores; Deep Sea Drilling Project; Diagenesis; Diatoms; Early diagenesis; Framework silicates; Genesis; Indian Ocean; Invertebrata; Maud Rise; Microfossils; Mineral composition; Miocene; Neogene; Ocean Drilling Program; Ooze; Opal; Organic carbon; Organic compounds; Organic materials; Plantae; Porcellanite; Protista; Radiolaria; Recrystallization; Sedimentary rocks; Sediments; Silica; Silica minerals; Silicates; Siliceous composition; Solutes; Southern Ocean; Southwest Indian Ridge; Stratigraphy; Tertiary; Weddell Sea
Record ID: 1994025501
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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