(Appendix) Bulk inorganic chemistry at DSDP Leg 77 Holes
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1984
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| _version_ | 1867169081497485312 |
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| author | Debrabant, Pierre Chamley, Hervè Foulon, Janine |
| author_facet | Debrabant, Pierre Chamley, Hervè Foulon, Janine |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Clay mineralogic and inorganic geochemical investigations of Cretaceous and Cenozoic sediments of the western Gulf of Mexico lead to the following main conclusions. (1) Transition of lowermost Cretaceous continental to marine sedimentation is marked by a clay evaporitic stage, north of the Campeche Escarpment. (2) Existence of combined mineralogic and geochemical stratigraphy allows us to propose correlations between Sites 535 and 540, especially for the Albian. (3) Predominance of detrital clay assemblages is indicative of hot and variably humid continental climate until the early late Cenozoic. (4) Tectonic destabilization of the margins of Gulf of Mexico occurred at different periods, especially until the middle Cretaceous, with a mixed erosion of rocks and soils and temporary oxidized conditions of deposition. (5) Successive developments of confined perimarine basins occurred from the earliest Cretaceous until the Miocene, chiefly in the Florida area. The sources of inorganic materials were chiefly situated on the east of the studied area until the late Tertiary and after that in the Mississippi River basin. (6) Occasionally, volcanic activity influenced the clay mineralogy and mainly the geochemistry, and possibly contributed to the rather strong magnesian character of the deposition until the late Paleogene. (7) The argillaceous diagenesis is weak; variability of the carbonate diagenesis is marked by the relation Sr = f(CaO) and chiefly depends on the depth of burial, the clay content, the porosity, and the geologic age. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_809137 |
| institution | PANGAEA |
| language | en |
| publishDate | 1984 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Appendix) Bulk inorganic chemistry at DSDP Leg 77 Holes Debrabant, Pierre Chamley, Hervè Foulon, Janine 77-535; 77-537; 77-538A; 77-540; Aluminium oxide; Atomic absorption spectrometry (AAS); Calcium oxide; Chromium; Cobalt; Colorimetry; Copper; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/BASIN; Gulf of Mexico/KNOLL; Iron oxide, Fe2O3; Latitude of event; Lead; Leg77; Lithium; Longitude of event; Magnesium oxide; Manganese; Nickel; Potassium oxide; Sample code/label; see reference(s); Silicon dioxide; Sodium oxide; Spectrophotometry; Strontium; Titanium dioxide; Vanadium; Zinc Clay mineralogic and inorganic geochemical investigations of Cretaceous and Cenozoic sediments of the western Gulf of Mexico lead to the following main conclusions. (1) Transition of lowermost Cretaceous continental to marine sedimentation is marked by a clay evaporitic stage, north of the Campeche Escarpment. (2) Existence of combined mineralogic and geochemical stratigraphy allows us to propose correlations between Sites 535 and 540, especially for the Albian. (3) Predominance of detrital clay assemblages is indicative of hot and variably humid continental climate until the early late Cenozoic. (4) Tectonic destabilization of the margins of Gulf of Mexico occurred at different periods, especially until the middle Cretaceous, with a mixed erosion of rocks and soils and temporary oxidized conditions of deposition. (5) Successive developments of confined perimarine basins occurred from the earliest Cretaceous until the Miocene, chiefly in the Florida area. The sources of inorganic materials were chiefly situated on the east of the studied area until the late Tertiary and after that in the Mississippi River basin. (6) Occasionally, volcanic activity influenced the clay mineralogy and mainly the geochemistry, and possibly contributed to the rather strong magnesian character of the deposition until the late Paleogene. (7) The argillaceous diagenesis is weak; variability of the carbonate diagenesis is marked by the relation Sr = f(CaO) and chiefly depends on the depth of burial, the clay content, the porosity, and the geologic age. |
| title | (Appendix) Bulk inorganic chemistry at DSDP Leg 77 Holes |
| topic | 77-535; 77-537; 77-538A; 77-540; Aluminium oxide; Atomic absorption spectrometry (AAS); Calcium oxide; Chromium; Cobalt; Colorimetry; Copper; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/BASIN; Gulf of Mexico/KNOLL; Iron oxide, Fe2O3; Latitude of event; Lead; Leg77; Lithium; Longitude of event; Magnesium oxide; Manganese; Nickel; Potassium oxide; Sample code/label; see reference(s); Silicon dioxide; Sodium oxide; Spectrophotometry; Strontium; Titanium dioxide; Vanadium; Zinc |
| url | https://doi.org/10.1594/PANGAEA.809137 |