Thermal structure of a fossil mantle diapir inferred from the distribution of mafic cumulates
| Autor: | Marc Monnereau, Georges Ceuleneer, Isma Amri |
|---|---|
| Přispěvatelé: | Laboratoire de Tectonophysique, Université de Nantes (UN), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Université Abdelmalek Essaâdi (UAE) |
| Rok vydání: | 1996 |
| Předmět: |
Peridotite
geography Multidisciplinary geography.geographical_feature_category Fractional crystallization (geology) 010504 meteorology & atmospheric sciences [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mid-ocean ridge Diapir 010502 geochemistry & geophysics Ophiolite 01 natural sciences Mantle (geology) [SDU]Sciences of the Universe [physics] Oceanic crust Mafic Petrology ComputingMilieux_MISCELLANEOUS Geology 0105 earth and related environmental sciences |
| Zdroj: | Nature Nature, Nature Publishing Group, 1996, 379 (6561), pp.149-153. ⟨10.1038/379149a0⟩ |
| ISSN: | 1476-4687 0028-0836 1476-4679 |
| Popis: | MAFIC lithologies constitute a minor but ubiquitous component of the mantle section of ophiolites; they are currently viewed as cumulates left by basaltic melts travelling from the melting region to the surface. These features may be used to constrain the mechanisms of melt migration in the mantle, provided their geophysical context of emplacement can be established in some detail. Here we report on the nature and distribution of mafic cumulates in the harzburgites of the Oman ophiolite, within and around a mantle diapir frozen beneath a spreading axis1–6. We show that their composition, texture and field characteristics are systematically related and display a concentric zoning centred on the diapir. We propose that this zoning reflects the thermal structure of the diapir and of the associated melt plumbing system. Assuming a parental liquid with the composition of mid-ocean-ridge basalt7–9, the cumulate compositions show that the melt temperature exceeded 1,230 °C in the innermost part of the diapir and decreased progressively down to |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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