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V. I. Vlodavetz 《Bulletin of Volcanology》1971,35(2):470-478
The Turja Peninsula consists of porphyritic granite overlain by sandstone, cut by numerous dikes and veins of varying composition, form, and orientation. The relative ages of the dikes and veins has been established by their mutual intersections, and correlation of these with compositions of the rocks demonstrates the existence of three periods of igneous activity. The dikes and veins of the first period strike predominantly NNE and dip ESE. Most of those of the second period strike E-W and dip N, but those of a subordinate group strike NNE and dip ESE. Those of the third period strike predominantly N-S and dip E. The first and third periods are characterized by fine grained rocks resembling effusives, the second by coarse grained typically intrusive rocks and intense metasomatism that altered both dikes and veins and the wall rocks. The difference in texture of rocks formed at the same depth horizon is attributed to a difference in temperature of the wall rocks and the rate of rise of the magma through them. 相似文献
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Prof. V. I. Vlodavetz 《International Journal of Earth Sciences》1968,57(3):966-972
The lavas of the Kljuchevsky volcano which effused first and from higher horizons of the volcano, were somewhat more acid as compared to the following lava flows. Simultaneously, changes occurred in the composition of the minerals of the lavas. Their olivine and pyroxenes correspondingly changed from more ferruginous to less ferruginous, and the plagioclases changed from less basic to more basic. These changes of the composition of the minerals in the lavas were, by the author's supposition, the result of a differentiation due to temperature-diffusion.
Dedicated to Professor Dr. A.Rittmann on the occasion of his 75. birthday 相似文献
Zusammenfassung Die Laven des Vulkans Klyutschewsky, die als erste ausgeflossen sind und aus einem höheren Stockwerk stammen, sind etwas saurer im Vergleich zu den nachfolgenden Lavaeffusionen. Gleichzeitig änderte sich auch die Zusammensetzung der Minerale in den Laven. Der Eisengehalt von Olivin und Pyroxenen verringerte sich; Plagioklase wechselten von weniger basischen zu stärker basischen Abarten. Nach Meinung des Autors sind solche Veränderungen der Minerale in den Laven das Ergebnis einer Differentiation, die auf einer temperaturabhängigen Diffusion beruht.
Résumé Les laves du volcan Kljutchevsky qui se sont épanchées au cours de la première effusion et originant des niveaux supérieurs du volcan, sont un peu plus acides comparées aux laves des épanchements suivants. La composition des minéraux de ces laves s'est changée simultanément. L'olivine et les pyroxénes se sont changés conformément: des plus ferrugineux vers les moins ferrugineux, et les plagioclases des moins basiques vers les espèces plus basiques. Selon la supposition de l'auteur, ces changements de la composition des minéraux des laves résultent d'une différentiation qui est la conséquence de la diffusion liée au changement de la température.
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Dedicated to Professor Dr. A.Rittmann on the occasion of his 75. birthday 相似文献
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V. I. Vlodavetz 《Bulletin of Volcanology》1971,35(2):462-469
Alkali basalts of Dariganga contain inclusions of dunite, harzburgite, peridotite, and eclogite-like rock. The dunites and peridotites contain few trace elements, but these are somewhat more abundant in the eclogite-like rock, and the alkali basalts are rather rich in them. The trace elements show a more or less continuous change in abundance that can be related by recognized crystal-chemical laws to the major elements of the minerals that are present in the various rock types. Hypotheses for the origin of basaltic magma are discussed in relation to the trace-element distribution in the Dariganga rocks, but it is concluded that the available evidence does not permit any definite decision as to which is correct. 相似文献
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