Velocity-density systematics for basalts at DSPD Leg 54 Holes
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| Auteurs principaux: | , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1980
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| _version_ | 1867168565135671296 |
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| author | Warren, Nick Rosendahl, Bruce R |
| author_facet | Warren, Nick Rosendahl, Bruce R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Precise velocity and density measurements at atmospheric and elevated pressures have been obtained on basalts drilled in 13 holes during Leg 54. The vp-sigma data show systematics which are controlled by the degree of crystallinity (or conversely, glassiness), microstructure, and original mineralogy and chemistry. Extensively fractionated basalts with marked iron enrichment produce anomalously low measured velocities at densities above 2.90 g/cm**3. Also, the effective in situ pressure acting on Leg 54 basalts is less than hydrostatic, and perhaps close to zero. At zero effective pressure, the measured velocities average 2.5 km/s higher than East Pacific Rise upper crustal velocities determined by seismic refraction. This implies that the in situ velocities are undoubtedly a result of the highly fragmented nature of East Pacific Rise crust. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_823561 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Velocity-density systematics for basalts at DSPD Leg 54 Holes Warren, Nick Rosendahl, Bruce R 54-420; 54-421; 54-422; 54-424; 54-424A; 54-424B; 54-424C; 54-425; 54-427; 54-428; 54-428A; 54-429A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg54; North Pacific/CONT RISE; North Pacific/MOUND; North Pacific/RIDGE; North Pacific/SEDIMENT POND; North Pacific/TROUGH Precise velocity and density measurements at atmospheric and elevated pressures have been obtained on basalts drilled in 13 holes during Leg 54. The vp-sigma data show systematics which are controlled by the degree of crystallinity (or conversely, glassiness), microstructure, and original mineralogy and chemistry. Extensively fractionated basalts with marked iron enrichment produce anomalously low measured velocities at densities above 2.90 g/cm**3. Also, the effective in situ pressure acting on Leg 54 basalts is less than hydrostatic, and perhaps close to zero. At zero effective pressure, the measured velocities average 2.5 km/s higher than East Pacific Rise upper crustal velocities determined by seismic refraction. This implies that the in situ velocities are undoubtedly a result of the highly fragmented nature of East Pacific Rise crust. |
| title | Velocity-density systematics for basalts at DSPD Leg 54 Holes |
| topic | 54-420; 54-421; 54-422; 54-424; 54-424A; 54-424B; 54-424C; 54-425; 54-427; 54-428; 54-428A; 54-429A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg54; North Pacific/CONT RISE; North Pacific/MOUND; North Pacific/RIDGE; North Pacific/SEDIMENT POND; North Pacific/TROUGH |
| url | https://doi.org/10.1594/PANGAEA.823561 |