Mineral an chemical composition of basalts from DSDP Sites 417 and 418, West Atlantic Ocean
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| Autores principales: | , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1981
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| _version_ | 1867167659083169792 |
|---|---|
| author | Staudigel, Hubert Bryan, Wilfred B |
| author_facet | Staudigel, Hubert Bryan, Wilfred B |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Major element composition ranges of closely associated basalt glass-whole rock pairs from individual small cooling units approach the total known range of basalt glass and whole rock compositions at IPOD sites 417 and 418. The whole rock samples fall into two groups: one is depleted in MgO and distinctly enriched in plagioclase but has lost some olivine and/or pyroxene relative to its corresponding glass; and the other is enriched in MgO and in phenocrysts of olivine and pyroxene as well as plagioclase compared to its corresponding glass. By analogy with observed phenocryst distributions in lava pillows, tubes, and dikes, and with some theoretical studies, we infer that bulk rock compositions are strongly affected by phenocryst redistribution due to gravity settling, flotation, and dynamic sorting after eruption, although specific models are not well constrained by the one-dimensional geometry of drill core. Compositional trends or groupings in whole rock data resulting from such late-stage processes should not be confused with more fundamental compositional effects produced in deep chambers or during partial melting. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_667437 |
| institution | PANGAEA |
| language | en |
| publishDate | 1981 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineral an chemical composition of basalts from DSDP Sites 417 and 418, West Atlantic Ocean Staudigel, Hubert Bryan, Wilfred B 51-417D; 52-418A; 53-418_Site; 53-418A; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg51; Leg52; Leg53; North Atlantic/CONT RISE Major element composition ranges of closely associated basalt glass-whole rock pairs from individual small cooling units approach the total known range of basalt glass and whole rock compositions at IPOD sites 417 and 418. The whole rock samples fall into two groups: one is depleted in MgO and distinctly enriched in plagioclase but has lost some olivine and/or pyroxene relative to its corresponding glass; and the other is enriched in MgO and in phenocrysts of olivine and pyroxene as well as plagioclase compared to its corresponding glass. By analogy with observed phenocryst distributions in lava pillows, tubes, and dikes, and with some theoretical studies, we infer that bulk rock compositions are strongly affected by phenocryst redistribution due to gravity settling, flotation, and dynamic sorting after eruption, although specific models are not well constrained by the one-dimensional geometry of drill core. Compositional trends or groupings in whole rock data resulting from such late-stage processes should not be confused with more fundamental compositional effects produced in deep chambers or during partial melting. |
| title | Mineral an chemical composition of basalts from DSDP Sites 417 and 418, West Atlantic Ocean |
| topic | 51-417D; 52-418A; 53-418_Site; 53-418A; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg51; Leg52; Leg53; North Atlantic/CONT RISE |
| url | https://doi.org/10.1594/PANGAEA.667437 |