996 resultados para käsikirjoitukset - 1100-1200-luku
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Colbertinus
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Colbertinus
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The influence of second phases (e.g., pyroxenes) on olivine grain size was studied by quantitative microfabric analyses of samples of the Hilti massif mantle shear zone (Semail ophiolite, Oman). The microstructures range from porphyroclastic tectonites to ultramylonites, from outside to the center of the shear zone. Starting at conditions of ridge-related flow, they formed under continuous cooling leading to progressive strain localization. The dependence of the average olivine grain size on the second-phase content can be split into a second-phase controlled and a dynamic recrystallization-controlled field. In the former, the olivine grain size is related to the ratio between the second-phase grain size and volume fraction (Zener parameter). In the latter, dynamic recrystallization manifested by a balance between grain growth and grain size reduction processes yields a stable olivine grain size. In both fields the average olivine and second-phase grain size decreases with decreasing temperature. Combining the microstructural information with deformation mechanism maps suggests that the porphyroclastic tectonites (similar to 1100 degrees C) and mylonites (similar to 800 degrees C) formed under the predominance of dislocation creep. Since olivine-rich layers are intercalated with layer parallel, polymineralic bands in the mylonites, nearly equiviscous conditions can be assumed. In the ultramylonites, diffusion creep represents the major deformation mechanism in the polymineralic layers. It is this switch in deformation mechanism from dislocation creep to diffusion creep that forces strain to localize in the fine-grained polymineralic domains at low temperatures (<similar to 700 degrees C), underlining the role of the second phases on strain localization in cooling mantle rocks.
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Colbertinus
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Colbertinus
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Colbertinus
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Colbertinus
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Acquis le 28 novembre 1821 de M. Renard de la Savonnerie, avec 6 autres mss., pour le prix global de 600 francs; cf. B.n.F., département des Manuscrits, Archives Modernes 492ter, registre des acquisitions du département des Manuscrits 1821-1830, f. 41 "Premier cartulaire de l'abbaye de Vauclair, diocèse de Laon; un vol. fol."; nouv. acq. fr. 5530.
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Contient : Consolation de Boëce ; Commentaire sur les psaumes
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Acquis le 10 juillet 1818 de M. Chaulay de Tonnerre, pour le prix de 15 francs; cf. B.n.F., département des Manuscrits, Archives Modernes 492bis, registre des acquisitions du département des Manuscrits 1806-1820, f. 243 "Anonymi authoris de imagine mundi. Vener. Bedae de elementis et de rerum natura. Un vol. in 4° minori, en parch. XIVe s."; — note du XVIIIe s. de"Joseph Antonius Saxius bibliothecae Ambrosianae praefectus" (85v)
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Suspending the nation in Aleksis Kivi's Seven brothers