Geochemistry of Neogene volcanic ashs in ODP Leg 124 holes
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1991
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| _version_ | 1867169503529402368 |
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| author | Desprairies, Alain Rivière, Marc Pubellier, Manuela |
| author_facet | Desprairies, Alain Rivière, Marc Pubellier, Manuela |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Mineralogical and geochemical analyses were performed on 40 ash layers of Pleistocene to late Miocene age, recovered during Leg 124 in the Celebes and Sulu Seas (Sites 767, 768, and 769). They provide information on alteration processes related to burial diagenesis. The zonal distribution of secondary volcanic products emphasizes a major diagenetic change, characterized by the complete replacement of volcanic glass by an authigenic smectite-phillipsite assemblage, in tephra layers dated at 3.5-4 Ma. This diagenetic "event" occurs simultaneously in the two basins, and, on the basis of isotopic data, under low-temperature conditions. It is independent of distinct sedimentation rates and related to a relative quiescence of on-land volcanic activity. This period suggests a more uniform paleooceanographic situation having tectonic significance, and probably reflects a kinetic and environmental control of diagenetic reactions. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_762390 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of Neogene volcanic ashs in ODP Leg 124 holes Desprairies, Alain Rivière, Marc Pubellier, Manuela 124-767B; 124-768A; 124-768B; 124-769; 124-769B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg124; Mindanao Sea; Ocean Drilling Program; ODP; Sulu Sea Mineralogical and geochemical analyses were performed on 40 ash layers of Pleistocene to late Miocene age, recovered during Leg 124 in the Celebes and Sulu Seas (Sites 767, 768, and 769). They provide information on alteration processes related to burial diagenesis. The zonal distribution of secondary volcanic products emphasizes a major diagenetic change, characterized by the complete replacement of volcanic glass by an authigenic smectite-phillipsite assemblage, in tephra layers dated at 3.5-4 Ma. This diagenetic "event" occurs simultaneously in the two basins, and, on the basis of isotopic data, under low-temperature conditions. It is independent of distinct sedimentation rates and related to a relative quiescence of on-land volcanic activity. This period suggests a more uniform paleooceanographic situation having tectonic significance, and probably reflects a kinetic and environmental control of diagenetic reactions. |
| title | Geochemistry of Neogene volcanic ashs in ODP Leg 124 holes |
| topic | 124-767B; 124-768A; 124-768B; 124-769; 124-769B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg124; Mindanao Sea; Ocean Drilling Program; ODP; Sulu Sea |
| url | https://doi.org/10.1594/PANGAEA.762390 |