| _version_ | 1867169502325637120 |
|---|---|
| author | Egeberg, Per Kristian Aagaard, Per Smalley, P Craig |
| author_facet | Egeberg, Per Kristian Aagaard, Per Smalley, P Craig |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Variations in the distribution of major elements and stable oxygen isotopes in ODP Leg 113 pore water are not related to lithology and thus appear to be controlled by minor constituents. Petrographic observations and geochemical considerations indicate that alteration of calc-alkalic volcanic material dispersed in the sediment is an important process. A diagenetic reaction is constructed that involves transformation of volcanic glass into smectite, zeolite (represented by phillipsite), chert, and iron sulfide. Mass balance calculations reveal that alteration of less than 10% (volume) of volcanogenic material may account for the observed depletion of magnesium, potassium, and 18O and enrichment of calcium. Alteration of this amount of volcanic glass produces less than 4% (volume) of smectite and zeolite. Hence, mass balance is obtained without having to invoke unreasonable large amounts of volcanic matter or interactions between seawater and basement. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_753954 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Interstitial-water chemistry of ODP Leg 113 sites Egeberg, Per Kristian Aagaard, Per Smalley, P Craig 113-689B; 113-690B; 113-690C; 113-693; 113-694B; 113-694C; 113-695A; 113-696A; 113-696B; 113-697A; 113-697B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Ocean Drilling Program; ODP; South Atlantic Ocean; Weddell Sea Variations in the distribution of major elements and stable oxygen isotopes in ODP Leg 113 pore water are not related to lithology and thus appear to be controlled by minor constituents. Petrographic observations and geochemical considerations indicate that alteration of calc-alkalic volcanic material dispersed in the sediment is an important process. A diagenetic reaction is constructed that involves transformation of volcanic glass into smectite, zeolite (represented by phillipsite), chert, and iron sulfide. Mass balance calculations reveal that alteration of less than 10% (volume) of volcanogenic material may account for the observed depletion of magnesium, potassium, and 18O and enrichment of calcium. Alteration of this amount of volcanic glass produces less than 4% (volume) of smectite and zeolite. Hence, mass balance is obtained without having to invoke unreasonable large amounts of volcanic matter or interactions between seawater and basement. |
| title | Interstitial-water chemistry of ODP Leg 113 sites |
| topic | 113-689B; 113-690B; 113-690C; 113-693; 113-694B; 113-694C; 113-695A; 113-696A; 113-696B; 113-697A; 113-697B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Ocean Drilling Program; ODP; South Atlantic Ocean; Weddell Sea |
| url | https://doi.org/10.1594/PANGAEA.753954 |