Sedimentology and mineralogy of surface sediments from the Chilean continental margin
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| Autori principali: | , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1998
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| _version_ | 1867172221216096256 |
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| author | Lamy, Frank Hebbeln, Dierk Wefer, Gerold |
| author_facet | Lamy, Frank Hebbeln, Dierk Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The regional patterns of texture and composition of modern continental slope and pelagic sediments off Chile between 25°S and 43°S reflect the latitudinal segmentation of geological, morphological, and climatic features of the continental hinterland. Grain-size characteristics are controlled by the grain-size of source rocks, the weathering regime, and mode of sediment input (eolian off northern Chile vs fluvial further south). Bulk-mineral assemblages reveal a low grade of maturity. Regional variations are governed by the source-rock composition of the different geological terranes and the relative source-rock contribution of the Coastal Range and Andes, as controlled by the continental hydrology. The relative abundance of clay minerals is also predominantly influenced by the source-rock composition and partly by continental smectite neoformation. Latitudinal variations of illite crystallinities along the Chilean continental slope (and west of the Peru-Chile trench) clearly reflect modifications of the weathering regime which correspond to the strong climatic zonation of Chile. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_711825 |
| institution | PANGAEA |
| language | en |
| publishDate | 1998 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sedimentology and mineralogy of surface sediments from the Chilean continental margin Lamy, Frank Hebbeln, Dierk Wefer, Gerold BC; Box corer; CHIPAL; CONDOR-Ia; CTD/Rosette; CTD-RO; GeoB3301-2; GeoB3302-2; GeoB3303-1; GeoB3304-3; GeoB3305-2; GeoB3308-3; GeoB3311-2; GeoB3312-8; GeoB3313-3; GeoB3314-2; GeoB3316-3; GeoB3317-6; GeoB3318-2; GeoB3323-4; GeoB3326-1; GeoB3327-6; GeoB3328-1; GeoB3347-1; GeoB3349-4; GeoB3352-2; GeoB3353-1; GeoB3354-1; GeoB3355-4; GeoB3357-1; GeoB3359-1; GeoB3365-1; GeoB3368-4; GeoB3371-1; GeoB3372-4; GeoB3373-1; GeoB3374-1; GeoB3375-2; GeoB3376-2; GeoB3377-1; GeoB3378-2; GeoB3383-1; GeoB3388-2; Giant box corer; GKG; Iquique-Ridge; MUC; MultiCorer; off Chile; SO101; SO101/3_1-2; SO101/3_2-2; SO101/3_3-1; SO102/1; SO102/2; Sonne; South-East Pacific; Thioploca; Thioploca_C18; Thioploca_C2; Thioploca_C21; Thioploca_C26; Thioploca_C32; Thioploca_C34; Thioploca_C36; Thioploca_C40; Thioploca_C41; Thioploca_C7; Thioploca_C9; Vidal Gormaz The regional patterns of texture and composition of modern continental slope and pelagic sediments off Chile between 25°S and 43°S reflect the latitudinal segmentation of geological, morphological, and climatic features of the continental hinterland. Grain-size characteristics are controlled by the grain-size of source rocks, the weathering regime, and mode of sediment input (eolian off northern Chile vs fluvial further south). Bulk-mineral assemblages reveal a low grade of maturity. Regional variations are governed by the source-rock composition of the different geological terranes and the relative source-rock contribution of the Coastal Range and Andes, as controlled by the continental hydrology. The relative abundance of clay minerals is also predominantly influenced by the source-rock composition and partly by continental smectite neoformation. Latitudinal variations of illite crystallinities along the Chilean continental slope (and west of the Peru-Chile trench) clearly reflect modifications of the weathering regime which correspond to the strong climatic zonation of Chile. |
| title | Sedimentology and mineralogy of surface sediments from the Chilean continental margin |
| topic | BC; Box corer; CHIPAL; CONDOR-Ia; CTD/Rosette; CTD-RO; GeoB3301-2; GeoB3302-2; GeoB3303-1; GeoB3304-3; GeoB3305-2; GeoB3308-3; GeoB3311-2; GeoB3312-8; GeoB3313-3; GeoB3314-2; GeoB3316-3; GeoB3317-6; GeoB3318-2; GeoB3323-4; GeoB3326-1; GeoB3327-6; GeoB3328-1; GeoB3347-1; GeoB3349-4; GeoB3352-2; GeoB3353-1; GeoB3354-1; GeoB3355-4; GeoB3357-1; GeoB3359-1; GeoB3365-1; GeoB3368-4; GeoB3371-1; GeoB3372-4; GeoB3373-1; GeoB3374-1; GeoB3375-2; GeoB3376-2; GeoB3377-1; GeoB3378-2; GeoB3383-1; GeoB3388-2; Giant box corer; GKG; Iquique-Ridge; MUC; MultiCorer; off Chile; SO101; SO101/3_1-2; SO101/3_2-2; SO101/3_3-1; SO102/1; SO102/2; Sonne; South-East Pacific; Thioploca; Thioploca_C18; Thioploca_C2; Thioploca_C21; Thioploca_C26; Thioploca_C32; Thioploca_C34; Thioploca_C36; Thioploca_C40; Thioploca_C41; Thioploca_C7; Thioploca_C9; Vidal Gormaz |
| url | https://doi.org/10.1594/PANGAEA.711825 |