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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1983
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.816536 |
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| _version_ | 1867169083265384448 |
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| author | Barrett, T J Friedrichsen, Hans |
| author_facet | Barrett, T J Friedrichsen, Hans |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Whole-rock basalt samples from the upper half of Deep Sea Drilling Project Hole 504B have oxygen-isotope compositions typical of mid-ocean-ridge basalts which have experienced a moderate degree of low-temperature alteration by sea water. By contrast, d18O values in the lower half of the hole correspond to basalts which have experienced almost no detectable oxygen-isotope alteration. These observations suggest that the overall water/rock ratio was lower in the lower half of the drilled crust. A correlation between d18O values and 87Sr/86Sr ratios suggests that the water/rock ratio, rather than temperature variation, was the main factor determining basalt d18O values. Hydrogen-isotope data appear to be consistent with a low water/rock ratio in the lower part of the crust. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_816536 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Sulfur isotopes, total sulfur, and degree of oxidation of basalt samples from DSDP Holes 69-504B and 70-504B Barrett, T J Friedrichsen, Hans 69-504B; 70-504B; Alteration; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg69; Leg70; Lithology/composition/facies; Mass spectrometry (MS); Piece; Sample code/label; Sample ID; δ18O; δ Deuterium Whole-rock basalt samples from the upper half of Deep Sea Drilling Project Hole 504B have oxygen-isotope compositions typical of mid-ocean-ridge basalts which have experienced a moderate degree of low-temperature alteration by sea water. By contrast, d18O values in the lower half of the hole correspond to basalts which have experienced almost no detectable oxygen-isotope alteration. These observations suggest that the overall water/rock ratio was lower in the lower half of the drilled crust. A correlation between d18O values and 87Sr/86Sr ratios suggests that the water/rock ratio, rather than temperature variation, was the main factor determining basalt d18O values. Hydrogen-isotope data appear to be consistent with a low water/rock ratio in the lower part of the crust. |
| title | (Table 1) Sulfur isotopes, total sulfur, and degree of oxidation of basalt samples from DSDP Holes 69-504B and 70-504B |
| topic | 69-504B; 70-504B; Alteration; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg69; Leg70; Lithology/composition/facies; Mass spectrometry (MS); Piece; Sample code/label; Sample ID; δ18O; δ Deuterium |
| url | https://doi.org/10.1594/PANGAEA.816536 |