Description and geochemistry of DSDP Leg 55 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_ | 1867171366811205632 |
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| author | Karpoff, Anne Marie Peterschmitt, Irene Hoffert, Michel |
| author_facet | Karpoff, Anne Marie Peterschmitt, Irene Hoffert, Michel |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | One of the objectives of Leg 55 was to investigate the Tertiary history of sedimentation and environment on the Emperor Seamounts after their volcanic activity. For the three first sites, 430, 431, and 432, drilled on Ojin, Nintoku, and Yömei Seamounts, the Neogene sedimentary deposits are not well represented and are not typical pelagic sediments. Except for two holes (430A and 432), where we found calcareous oozes, the sediments are heterogeneous sands, gravels, and pebbly mudstones with a wide range in grain size and composition. Two phenomena characterize these deposits: the inheritance of volcaniclastic material and its alteration, and the authigenesis of secondary minerals including silicates, phosphates, and ferromanganese oxides formed under volcanic influence in a marine environment. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_823277 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Description and geochemistry of DSDP Leg 55 Holes Karpoff, Anne Marie Peterschmitt, Irene Hoffert, Michel 55-430; 55-430A; 55-431; 55-431A; 55-432; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg55; North Pacific/SEDIMENT POND; North Pacific/TERRACE One of the objectives of Leg 55 was to investigate the Tertiary history of sedimentation and environment on the Emperor Seamounts after their volcanic activity. For the three first sites, 430, 431, and 432, drilled on Ojin, Nintoku, and Yömei Seamounts, the Neogene sedimentary deposits are not well represented and are not typical pelagic sediments. Except for two holes (430A and 432), where we found calcareous oozes, the sediments are heterogeneous sands, gravels, and pebbly mudstones with a wide range in grain size and composition. Two phenomena characterize these deposits: the inheritance of volcaniclastic material and its alteration, and the authigenesis of secondary minerals including silicates, phosphates, and ferromanganese oxides formed under volcanic influence in a marine environment. |
| title | Description and geochemistry of DSDP Leg 55 Holes |
| topic | 55-430; 55-430A; 55-431; 55-431A; 55-432; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg55; North Pacific/SEDIMENT POND; North Pacific/TERRACE |
| url | https://doi.org/10.1594/PANGAEA.823277 |