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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1985
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| Acceso en línea: | https://doi.org/10.1594/PANGAEA.805062 |
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| _version_ | 1867168137565175808 |
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| author | Friedrichsen, Hans |
| author_facet | Friedrichsen, Hans |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_805062 |
| institution | PANGAEA |
| language | en |
| publishDate | 1985 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Oxygen isotopes in minerals at DSDP Hole 83-504B basalts Friedrichsen, Hans 83-504B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg83; Lithology/composition/facies; Mass spectrometer Finnigan MAT 261; Minerals; Piece; Sample, optional label/labor no; Sample code/label; Strontium-87/Strontium-86 ratio; X-ray diffraction (XRD); δ18O; δ18O, standard deviation; δ Deuterium 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. |
| title | (Table 1) Oxygen isotopes in minerals at DSDP Hole 83-504B basalts |
| topic | 83-504B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg83; Lithology/composition/facies; Mass spectrometer Finnigan MAT 261; Minerals; Piece; Sample, optional label/labor no; Sample code/label; Strontium-87/Strontium-86 ratio; X-ray diffraction (XRD); δ18O; δ18O, standard deviation; δ Deuterium |
| url | https://doi.org/10.1594/PANGAEA.805062 |