Geochemistry and trace elements at DSDP Hole 78-543A
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1984
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| _version_ | 1867168562829852672 |
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| author | Bougault, Henri Joron, Jean Louis Maury, R C Bohn, Marcel Tardy, M Biju-Duval, Bernard |
| author_facet | Bougault, Henri Joron, Jean Louis Maury, R C Bohn, Marcel Tardy, M Biju-Duval, Bernard |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The upper part of the basaltic substratum of the Atlantic abyssal plain, approaching subduction beneath the Barbados Ridge and thus presumably beneath the Lesser Antilles island arc, is made of typical LREE-depleted oceanic tholeiites. Mineralogical (microprobe) and geochemical (X-ray fluorescence, neutron activation analyses) data are given for 12 samples from the bottom of Hole 543A, which is 3.5 km seaward of the deformation front of the Barbados Ridge complex. These basalts are overlain by a Quaternary to Maestrichtian-Campanian sedimentary sequence. Most of the basalts are relatively fresh (in spite of the alteration of olivine and development of some celadonite, clays, and chlorite in their groundmass), and their mineralogical and geochemical compositions are similar to those of LREE-depleted recent basalts from the Mid-Atlantic Ridge. The most altered samples occur at the top of the basaltic sequence, and show trends of enrichment in alkali metals typical of altered oceanic tholeiites. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_808824 |
| institution | PANGAEA |
| language | en |
| publishDate | 1984 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry and trace elements at DSDP Hole 78-543A Bougault, Henri Joron, Jean Louis Maury, R C Bohn, Marcel Tardy, M Biju-Duval, Bernard 78-543A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg78; Leg78AB; North Atlantic/CONT RISE The upper part of the basaltic substratum of the Atlantic abyssal plain, approaching subduction beneath the Barbados Ridge and thus presumably beneath the Lesser Antilles island arc, is made of typical LREE-depleted oceanic tholeiites. Mineralogical (microprobe) and geochemical (X-ray fluorescence, neutron activation analyses) data are given for 12 samples from the bottom of Hole 543A, which is 3.5 km seaward of the deformation front of the Barbados Ridge complex. These basalts are overlain by a Quaternary to Maestrichtian-Campanian sedimentary sequence. Most of the basalts are relatively fresh (in spite of the alteration of olivine and development of some celadonite, clays, and chlorite in their groundmass), and their mineralogical and geochemical compositions are similar to those of LREE-depleted recent basalts from the Mid-Atlantic Ridge. The most altered samples occur at the top of the basaltic sequence, and show trends of enrichment in alkali metals typical of altered oceanic tholeiites. |
| title | Geochemistry and trace elements at DSDP Hole 78-543A |
| topic | 78-543A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg78; Leg78AB; North Atlantic/CONT RISE |
| url | https://doi.org/10.1594/PANGAEA.808824 |