Geochemistry and minerals at DSDP Leg 81 Holes
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| Autores principales: | , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1984
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| _version_ | 1867168562504794112 |
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| author | Joron, Jean Louis Bougault, Henri Maury, R C Bohn, Marcel Desprairies, Alain |
| author_facet | Joron, Jean Louis Bougault, Henri Maury, R C Bohn, Marcel Desprairies, Alain |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Leg 81 basalts, drilled either from the margins ("dipping reflectors" sequence: Holes 552, 553A, and 554A) or from the "continental" side (Hole 555) of the Rockall Plateau microcontinent, are strongly light rare-earth element (LREE) depleted oceanic tholeiites. The basalts from the four holes are almost similar. Most of their primary characteristics have been preserved, although they have suffered alteration by seawater. From the petrological and mineralogical points of view, they resemble deep-ocean-floor basalts but show some peculiarities (occurrence of pigeonite and ilmenite as normal components of the groundmass differentiation sequences toward ferrobasalts). Their geochemical characteristics are dominated by their extreme depletion in the most hygromagmaphile elements (Th, Ta, La, and Nb), the concentrations of which are sometimes lower than the corresponding chondritic values. Leg 81 basalts are thus clearly different from continental tholeiites (flood basalts): Possible equivalents in the Thulean Tertiary Magmatic Province include the LREE-depleted tholeiites from the Upper Basaltic Series of the Faeroe Islands and the Preshal Mhor basalt type from the British Tertiary Province. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_807088 |
| institution | PANGAEA |
| language | en |
| publishDate | 1984 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry and minerals at DSDP Leg 81 Holes Joron, Jean Louis Bougault, Henri Maury, R C Bohn, Marcel Desprairies, Alain Deep Sea Drilling Project; DSDP The Leg 81 basalts, drilled either from the margins ("dipping reflectors" sequence: Holes 552, 553A, and 554A) or from the "continental" side (Hole 555) of the Rockall Plateau microcontinent, are strongly light rare-earth element (LREE) depleted oceanic tholeiites. The basalts from the four holes are almost similar. Most of their primary characteristics have been preserved, although they have suffered alteration by seawater. From the petrological and mineralogical points of view, they resemble deep-ocean-floor basalts but show some peculiarities (occurrence of pigeonite and ilmenite as normal components of the groundmass differentiation sequences toward ferrobasalts). Their geochemical characteristics are dominated by their extreme depletion in the most hygromagmaphile elements (Th, Ta, La, and Nb), the concentrations of which are sometimes lower than the corresponding chondritic values. Leg 81 basalts are thus clearly different from continental tholeiites (flood basalts): Possible equivalents in the Thulean Tertiary Magmatic Province include the LREE-depleted tholeiites from the Upper Basaltic Series of the Faeroe Islands and the Preshal Mhor basalt type from the British Tertiary Province. |
| title | Geochemistry and minerals at DSDP Leg 81 Holes |
| topic | Deep Sea Drilling Project; DSDP |
| url | https://doi.org/10.1594/PANGAEA.807088 |