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Knauth, L Paul; Epstein, Samuel (1975): Mineralogy, isotopic composition of oxygen, hydrogen and carbon, and oxygen isotopic temperature of deep-sea silica and coexisting carbonates (Table 1). PANGAEA,, Supplement to: Knauth, LP; Epstein, S (1975): Hydrogen and oxygen isotope ratios in silica from the Joides Deep Sea Drilling Project. Earth and Planetary Science Letters, 25(1), 1-10,

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Water extracted from opal-CT ("porcellanite", "cristobalite"), granular microcrystalline quartz (chert), and pure fibrous quartz (chalcedony) in cherts from the JOIDES Deep Sea Drilling Project is 56? to 87? depleted in deuterium relative to the water in which the silica formed. This large fractionation is similar in magnitude and sign to that observed for hydroxyl in clay minerals and suggests that water extracted from these forms of silica has been derived from hydroxyl groups within the silica.
Delta18O-values for opal-CT at sites 61, 64, 70B and 149 vary from 34.3? to 37.2? and show no direct correlation with depth of burial. Granular microcrystaUine quartz in these cores is 0.5 ? depleted in 18O relative to coexisting opal-CT at sediment depths of 100 m and the depletion increases to 2? for sediments buried below 384 m. These relationships suggest that opal-CT forms before significant burial while granular microcrystalline quartz forms during deeper burial at warmer temperatures. The temperature at which opal-CT forms is thus probably approximately equal to the temperature of the overlying bottom water. Isotopic temperatures deduced for opal-CT formation are preliminary and very approximate, but yield Eocene deep-water temperatures of 5-13°C, and 6°C for the upper Cretaceous sample.
Pure euhedral quartz crystals lining a cavity in opal-CT at 388 m in core 8-70B-4-CC have a ~delta18O value of +29.8? and probably formed near maximum burial. The isotopic temperature is approximately 32 ° C.
Median Latitude: 7.556080 * Median Longitude: -155.384060 * South-bound Latitude: -1.742200 * West-bound Longitude: 147.061700 * North-bound Latitude: 15.104200 * East-bound Longitude: -69.364200
Date/Time Start: 1969-08-09T00:00:00 * Date/Time End: 1971-01-05T00:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: 984 m
15-149 * Latitude: 15.104200 * Longitude: -69.364200 * Date/Time: 1971-01-05T00:00:00 * Elevation: -3972.0 m * Penetration: 390 m * Recovery: 239.4 m * Location: Caribbean Sea/BASIN * Campaign: Leg15 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 390 m cored; 0 m drilled; 61.4 % recovery
7-61 * Latitude: 12.083700 * Longitude: 147.061700 * Date/Time: 1969-08-09T00:00:00 * Elevation: -5570.0 m * Penetration: 97 m * Recovery: 3 m * Location: North Pacific * Campaign: Leg7 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 12 m cored; 0 m drilled; 25 % recovery
7-64 * Latitude: -1.742200 * Longitude: 158.609700 * Date/Time: 1969-08-31T00:00:00 * Elevation: -2060.0 m * Penetration: 851 m * Recovery: 74 m * Location: South Pacific/PLATEAU * Campaign: Leg7 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 79 m cored; 0 m drilled; 93.7 % recovery
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Sample code/labelSample labelKnauth, L PaulODP sample designation
7Sample code/label 2Sample label 2Knauth, L Paul
8Lithology/composition/faciesLithologyKnauth, L Paul
9delta 18Od18Oper milKnauth, L Paul
10delta 13Cd13Cper mil PDBKnauth, L Paul
11Water in rockH2O%Knauth, L Paul
12delta DeuteriumdDper mil SMOWKnauth, L Paul
13Temperature, waterTemp°CKnauth, L PaulIsotopic temperature
119 data points

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