دورية أكاديمية
Geochemistry of the mantle beneath the Rodriguez Triple Junction and the South-East Indian Ridge
العنوان: | Geochemistry of the mantle beneath the Rodriguez Triple Junction and the South-East Indian Ridge |
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المؤلفون: | Michard, A, Montigny, R, Schlich, R |
المصدر: | Oceanologica Acta, Special issue (0399-1784) (Gauthier-Villars), 1990 |
بيانات النشر: | Gauthier-Villars |
سنة النشر: | 1990 |
المجموعة: | Ifremer (French Research Institute for Exploitation of the Sea): Archimer |
الوصف: | Rare earth element abundances and Sr, Nd, Pb isotope compositions have been measured on zero-age dredge sample from the Rodriguez Triple Junction (RTJ) and the South-East Indian Ridge (SEIR). Along the SEIR, the geochemical "halo" of the St. Paul hot spot has a half-width of plus or minus 400 km and the data may be fairly well accounted for by a binary mixing between an Indian MORB-type component ( super(87)Sr/ super(86)Sr = 0.7028, super(143)Nd/ super(144)Nd = 0.51304, super(206)Pb/ super(204)Pb = 17.8) and the plume-type St. Paul component (0.7036, 0.5129, and 18.7 respectively). The RTJ has distinctive geochemical properties which contrast with those of the adjacent ridge segments. Low super(206)Pb/ super(204)Pb ratios which plot to the left of the geochron, rather high super(208)Pb/ super(204)Pb and super(87)Sr/ super(86)Sr ratios (17.4, 37.4, and 0.7031 respectively), a striking isotopic homogeneity, and variable LREE/HREE fractionation with (La/Sm) sub(N) = 0.3-0.8 make this triple junction an anomalous site. The geochemical properties of the Indian Ocean basalts have been examined using a three-component mantle model. |
نوع الوثيقة: | article in journal/newspaper |
وصف الملف: | application/pdf |
اللغة: | English |
العلاقة: | https://archimer.ifremer.fr/doc/00268/37944/36025.pdfTest; https://archimer.ifremer.fr/doc/00268/37944Test/ |
الإتاحة: | https://archimer.ifremer.fr/doc/00268/37944/36025.pdfTest https://archimer.ifremer.fr/doc/00268/37944Test/ |
حقوق: | info:eu-repo/semantics/openAccess ; restricted use |
رقم الانضمام: | edsbas.C108E899 |
قاعدة البيانات: | BASE |
الوصف غير متاح. |