Low-temperature opal-CT precipitation in Antarctic deep-sea sediments: evidence from oxygen isotopes

Details Low-temperature opal-CT precipitation in Antarctic deep-sea sediments: evidence from oxygen isotopes Low-temperature opal-CT precipitation in Antarctic deep-sea sediments: evidence from oxygen isotopes

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..612b&link_type=abstract

Earth and Planetary Science Letters, Volume 107, Issue 3-4, p. 612-617.

Physics

4

Scientific paper

Porcellanite has been found in Antarctic deep-sea sediments of shallow burial depth at four different sites in host sediments younger than 4 Ma. Oxygen isotope analysis shows that the opal-CT samples are extremely rich in 18O (δ18O = 41.2 to 44.7‰ rel. SMOW). According to the quartz/water fractionation the calculated isotopic opal-CT formation temperature is in the range of 0 to 4°C. This agrees well with sediment temperature measurements. The low opal-CT precipitation temperature contrasts with current ideas about later diagenetic formation of opal-CT at higher temperatures of 18 to 56°C.
Present address: GEOMAR, Forschungszentrum für Marine Geowissenschaften, Wischhofstrasse 1-3, W-2300 Kiel 14, FR.

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