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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1986
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| Online Access: | https://doi.org/10.1594/PANGAEA.763463 |
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| _version_ | 1867169038038204416 |
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| author | Adachi, Mamoru Yamamoto, Koshi Sugisaki, Ryuichi |
| author_facet | Adachi, Mamoru Yamamoto, Koshi Sugisaki, Ryuichi |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Analyses of 42 Cretaceous rock samples from Deep Sea Drilling Project (DSDP) Leg 32, in the northern Pacific, show that chert and porcellanite are enriched in Fe, Mn, P, Cu, Ba, Mo, Ni and Pb relative to both Triassic biogenic cherts of central Japan and Cretaceous DSDP cherts of Leg 62. The iron enrichment (up to 6.68% Fe2O3, as total iron) is most prominent in chert immediately overlying basal basalt which is the only chert free of radiolarians and veined by megaquartz containing many fluid inclusions. Chemical features characterized by a low ratio for AI/(Al +Fe+Mn) and Al2O3/TiO2 and a high ratio for total - Fe2O3/TiO2 - MnO/TiO2 and Mo/TiO2, as well as petrological evidence, indicate that the cherts formed in an intense submarine hydrothermal environment on or near the Cretaceous Japanese spreading center which separated the Kula plate from the Pacific plate. The spreading rate of the Cretaceous Japanese spreading center estimated from the chemical composition of the cherts was about 3.7 cm/yr;the rate is comparable to that inferred from the geomagnetic data. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_763463 |
| institution | PANGAEA |
| language | en |
| publishDate | 1986 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Major- and trace-element analyses of cherts, porcellanites, oozes, and clays from DSDP Sites 32-303 and 32-304 (Tables 1, 2) Adachi, Mamoru Yamamoto, Koshi Sugisaki, Ryuichi 32-303; 32-303A; 32-304; Aluminium oxide; Barium; Bromine; Calcium carbonate; Calcium oxide; Chromium; Cobalt; Copper; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Event label; Gallium; Glomar Challenger; Iron oxide, Fe2O3; Iron oxide, FeO; Lead; Leg32; Lithology/composition/facies; Magnesium oxide; Manganese oxide; Molybdenum; Nickel; Niobium; North Pacific/BASIN; Number; Phosphorus pentoxide; Potassium oxide; Residual; Rubidium; Sample code/label; Silicon dioxide; Sodium oxide; Strontium; Thorium; Titanium dioxide; Water in rock; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium Analyses of 42 Cretaceous rock samples from Deep Sea Drilling Project (DSDP) Leg 32, in the northern Pacific, show that chert and porcellanite are enriched in Fe, Mn, P, Cu, Ba, Mo, Ni and Pb relative to both Triassic biogenic cherts of central Japan and Cretaceous DSDP cherts of Leg 62. The iron enrichment (up to 6.68% Fe2O3, as total iron) is most prominent in chert immediately overlying basal basalt which is the only chert free of radiolarians and veined by megaquartz containing many fluid inclusions. Chemical features characterized by a low ratio for AI/(Al +Fe+Mn) and Al2O3/TiO2 and a high ratio for total - Fe2O3/TiO2 - MnO/TiO2 and Mo/TiO2, as well as petrological evidence, indicate that the cherts formed in an intense submarine hydrothermal environment on or near the Cretaceous Japanese spreading center which separated the Kula plate from the Pacific plate. The spreading rate of the Cretaceous Japanese spreading center estimated from the chemical composition of the cherts was about 3.7 cm/yr;the rate is comparable to that inferred from the geomagnetic data. |
| title | Major- and trace-element analyses of cherts, porcellanites, oozes, and clays from DSDP Sites 32-303 and 32-304 (Tables 1, 2) |
| topic | 32-303; 32-303A; 32-304; Aluminium oxide; Barium; Bromine; Calcium carbonate; Calcium oxide; Chromium; Cobalt; Copper; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Event label; Gallium; Glomar Challenger; Iron oxide, Fe2O3; Iron oxide, FeO; Lead; Leg32; Lithology/composition/facies; Magnesium oxide; Manganese oxide; Molybdenum; Nickel; Niobium; North Pacific/BASIN; Number; Phosphorus pentoxide; Potassium oxide; Residual; Rubidium; Sample code/label; Silicon dioxide; Sodium oxide; Strontium; Thorium; Titanium dioxide; Water in rock; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium |
| url | https://doi.org/10.1594/PANGAEA.763463 |