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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1983
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| Online Access: | https://doi.org/10.1594/PANGAEA.811425 |
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| _version_ | 1867170960750149632 |
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| author | Thompson, Geoffrey Humphris, Susan E Schilling, Jean-Guy |
| author_facet | Thompson, Geoffrey Humphris, Susan E Schilling, Jean-Guy |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Basalts from Hole 516F, DSDP Leg 72 on the Rio Grande Rise are tholeiitic in character but differ from normal mid-ocean ridge basalts in the South Atlantic in higher concentrations of incompatible elements such as Ti, K, V, Sr, Ba, Zr, Nb, and light rare-earth elements and in lower concentrations of Mg, Cr, and Ni. They contrast with previously reported basalts from the Rio Grande Rise, which were highly alkalic in character. The Rio Grande Rise basalts from Hole 516F (age 84.5 Ma) are generally similar to basalts from the eastern end of the Walvis Ridge (80-100 Ma). It is suggested that they either originated, like the Walvis Ridge, from a mantle hot spot that is different from the present-day hot spot (Tristan da Cunha) and that has changed composition with time, or from a spreading center that was shallow and chemically influenced by the adjacent hot spot, similar to the present-day Mid-Atlantic Ridge near the Azores and Tristan da Cunha. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811425 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Basalt geochemsitry at DSDP Hole 72-516F Thompson, Geoffrey Humphris, Susan E Schilling, Jean-Guy 72-516F; Aluminium oxide; Barium; Calcium oxide; Carbon dioxide; Cerium; Chromium; Cobalt; Copper; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Element analysis, neutron activation (NAA); Europium; Gadolinium; Glomar Challenger; Iron oxide, Fe2O3; Iron oxide, FeO; Lanthanum; Leg72; Lutetium; Magnesium oxide; Manganese oxide; Neodymium; Nickel; Niobium; Phosphorus pentoxide; Potassium oxide; Rubidium; Samarium; Sample code/label; Scandium; Silicon dioxide; Sodium oxide; South Atlantic/CONT RISE; Strontium; Terbium; Thulium; Titanium dioxide; Total; Vanadium; Water in rock; X-ray fluorescence (XRF); Ytterbium; Yttrium; Zinc; Zirconium Basalts from Hole 516F, DSDP Leg 72 on the Rio Grande Rise are tholeiitic in character but differ from normal mid-ocean ridge basalts in the South Atlantic in higher concentrations of incompatible elements such as Ti, K, V, Sr, Ba, Zr, Nb, and light rare-earth elements and in lower concentrations of Mg, Cr, and Ni. They contrast with previously reported basalts from the Rio Grande Rise, which were highly alkalic in character. The Rio Grande Rise basalts from Hole 516F (age 84.5 Ma) are generally similar to basalts from the eastern end of the Walvis Ridge (80-100 Ma). It is suggested that they either originated, like the Walvis Ridge, from a mantle hot spot that is different from the present-day hot spot (Tristan da Cunha) and that has changed composition with time, or from a spreading center that was shallow and chemically influenced by the adjacent hot spot, similar to the present-day Mid-Atlantic Ridge near the Azores and Tristan da Cunha. |
| title | (Table 1) Basalt geochemsitry at DSDP Hole 72-516F |
| topic | 72-516F; Aluminium oxide; Barium; Calcium oxide; Carbon dioxide; Cerium; Chromium; Cobalt; Copper; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Element analysis, neutron activation (NAA); Europium; Gadolinium; Glomar Challenger; Iron oxide, Fe2O3; Iron oxide, FeO; Lanthanum; Leg72; Lutetium; Magnesium oxide; Manganese oxide; Neodymium; Nickel; Niobium; Phosphorus pentoxide; Potassium oxide; Rubidium; Samarium; Sample code/label; Scandium; Silicon dioxide; Sodium oxide; South Atlantic/CONT RISE; Strontium; Terbium; Thulium; Titanium dioxide; Total; Vanadium; Water in rock; X-ray fluorescence (XRF); Ytterbium; Yttrium; Zinc; Zirconium |
| url | https://doi.org/10.1594/PANGAEA.811425 |