Geochemistry of ODP Sites 128-798 and 128-799 sediments
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| Auteurs principaux: | , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1992
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| _version_ | 1867171362663038976 |
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| author | Minai, Yoshitaka Matsumoto, Ryo Watanabe, Yoshio Tominaga, Takeshi |
| author_facet | Minai, Yoshitaka Matsumoto, Ryo Watanabe, Yoshio Tominaga, Takeshi |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Nineteen trace elements, including seven rare earth elements (REE's), and 10 major and minor elements in 76 sediment samples from Sites 798 (Oki Ridge) and 799 (Yamato Trough) were determined by means of instrumental neutron activation analysis and X-ray fluorescence spectrometry. Most REE patterns (chondrite-normalized) of the sediments from both sites were nearly identical to the patterns of terrigenous materials. The cerium anomaly (slightly positive) frequently appeared in REE patterns of the sediments (200-750 mbsf) from Site 799. Cerium may be selectively incorporated into the sediments with hydrogenous manganese precipitation. However, the degree of the anomaly was not well correlated with manganese content, suggesting that cerium may behave as a trivalent REE (like the other REE's) during diagenesis while manganese is transported in the sediment column accompanied by reduction to a lower oxidation state. The Th/Sc ratio of the sediments from Sites 798 and 799 tended to decrease with penetration depth. Such a depth profile may indicate a decrease in basic volcanism activities from the Pliocene (Site 798) and Miocene (Site 799). The La/Yb ratio and degree of europium anomaly also varied with depth, which may imply that two or more components with different REE patterns were supplied throughout sedimentation at sites in the Japan Sea. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_777320 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of ODP Sites 128-798 and 128-799 sediments Minai, Yoshitaka Matsumoto, Ryo Watanabe, Yoshio Tominaga, Takeshi 128-798A; 128-798B; 128-799A; 128-799B; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP Nineteen trace elements, including seven rare earth elements (REE's), and 10 major and minor elements in 76 sediment samples from Sites 798 (Oki Ridge) and 799 (Yamato Trough) were determined by means of instrumental neutron activation analysis and X-ray fluorescence spectrometry. Most REE patterns (chondrite-normalized) of the sediments from both sites were nearly identical to the patterns of terrigenous materials. The cerium anomaly (slightly positive) frequently appeared in REE patterns of the sediments (200-750 mbsf) from Site 799. Cerium may be selectively incorporated into the sediments with hydrogenous manganese precipitation. However, the degree of the anomaly was not well correlated with manganese content, suggesting that cerium may behave as a trivalent REE (like the other REE's) during diagenesis while manganese is transported in the sediment column accompanied by reduction to a lower oxidation state. The Th/Sc ratio of the sediments from Sites 798 and 799 tended to decrease with penetration depth. Such a depth profile may indicate a decrease in basic volcanism activities from the Pliocene (Site 798) and Miocene (Site 799). The La/Yb ratio and degree of europium anomaly also varied with depth, which may imply that two or more components with different REE patterns were supplied throughout sedimentation at sites in the Japan Sea. |
| title | Geochemistry of ODP Sites 128-798 and 128-799 sediments |
| topic | 128-798A; 128-798B; 128-799A; 128-799B; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.777320 |