Friedrichsen, Hans (1985): (Table 1) Oxygen isotopes in minerals at DSDP Hole 83-504B basalts [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.805062, Supplement to: Friedrichsen, H (1985): Strontium, oxygen, and hydrogen isotope studies on primary and secondary minerals in basalts from the Costa Rica Rift, Deep Sea Drilling Project Hole 504B, Leg 83. In: Anderson, RN; Honnorez, J; Becker, K; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 83, 289-295, https://doi.org/10.2973/dsdp.proc.83.112.1985
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Abstract:
The D/H, 18O/16O and 87Sr/86Sr ratios of the basaltic basement from the Leg 83 section of DSDP Hole 504B show that in that area the oceanic crust has experienced intensive but not pervasive alteration. Isotope ratios of the basalts are very heterogeneous because of an input of oxygen, hydrogen, and strontium from seawater. The hydrogen isotopic composition of many samples displays the complete thermal history of the water-rock interactions. High-temperature mineral formations (actinolites, epidotes, and chlorites) were overgrown by a mineralization at lower temperatures (mixedlayer smectites, iddingsites, and smectites) during successive stages of cooling of the oceanic crust by cold seawater. From 87Sr/86Sr data bulk water/rock ratios up to 5:1 have been calculated. There is evidence that some primary minerals like high-An plagioclases contain oxygen from altered basalts. We have discussed the probability that there existed a seawater/crust interface, now at a depth of 620 m sub-basement, during the high-temperature water/rock interactions. This interface was covered during later magmatism by thick flows, pillow lavas, and intrusives.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 1.227200 * Longitude: -83.730200
Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1982-01-02T00:00:00
Minimum Elevation: -3460.0 m * Maximum Elevation: -3460.0 m
Event(s):
83-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1982-01-02T00:00:00 * Elevation: -3460.0 m * Penetration: 1350 m * Recovery: 107.7 m * Campaign: Leg83 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: Leg 83 of DSDP was devoted entirely to coring and experiments in Hole 504B, the deepest borehole to date into the oceanic crust. Hole 504B now extends over a kilometer into basement, nearly twice as far as any other DSDP hole, and it is the only DSDP hole to have clearly penetrated into the intrusive sheeted dikes that underlie the extrusive pillow lavas of the upper oceanic crust. At Hole 504B, Leg 83 continued an ongoing DSDP effort that began during Legs 68, 69, and 70 in 1979, and also included part of Leg 92 in 1983. 71 cores; 514 m cored; 0 m drilled; 21 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Friedrichsen, Hans | DSDP/ODP/IODP sample designation | ||
| 2 | Piece | Piece | Friedrichsen, Hans | |||
| 3 | Sample, optional label/labor no | Lab no | Friedrichsen, Hans | |||
| 4 | Lithology/composition/facies | Lithology | Friedrichsen, Hans | |||
| 5 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Friedrichsen, Hans | Mass spectrometer Finnigan MAT 261 | ||
| 6 | δ Deuterium | δD | ‰ SMOW | Friedrichsen, Hans | X-ray diffraction (XRD) | Whole rock |
| 7 | δ Deuterium | δD | ‰ SMOW | Friedrichsen, Hans | X-ray diffraction (XRD) | Fine-grained minerals |
| 8 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Whole rock |
| 9 | δ18O, standard deviation | δ18O std dev | ± | Friedrichsen, Hans | X-ray diffraction (XRD) | Whole rock |
| 10 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Plagioclase |
| 11 | δ18O, standard deviation | δ18O std dev | ± | Friedrichsen, Hans | X-ray diffraction (XRD) | Plagioclase |
| 12 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Clinopyroxene |
| 13 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Orthopyroxene |
| 14 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Magnetite |
| 15 | δ18O, standard deviation | δ18O std dev | ± | Friedrichsen, Hans | X-ray diffraction (XRD) | Magnetite |
| 16 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Smectite |
| 17 | δ18O, standard deviation | δ18O std dev | ± | Friedrichsen, Hans | X-ray diffraction (XRD) | Smectite |
| 18 | δ Deuterium | δD | ‰ SMOW | Friedrichsen, Hans | X-ray diffraction (XRD) | Smectite |
| 19 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Chlorite |
| 20 | δ18O, standard deviation | δ18O std dev | ± | Friedrichsen, Hans | X-ray diffraction (XRD) | Chlorite |
| 21 | Minerals | Minerals | Friedrichsen, Hans | X-ray diffraction (XRD) | Other | |
| 22 | δ18O | δ18O | ‰ | Friedrichsen, Hans | X-ray diffraction (XRD) | Quartz |
| 23 | δ Deuterium | δD | ‰ SMOW | Friedrichsen, Hans | X-ray diffraction (XRD) | Quartz |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
561 data points