Chemical Transport in Metasomatic Processes by Hugh P. Taylor Jr., Robert T. Gregory, Bruno Turi (auth.),

By Hugh P. Taylor Jr., Robert T. Gregory, Bruno Turi (auth.), Harold C. Helgeson (eds.)

As indicated at the identify web page, this e-book is an outgrowth of the NATO complicated learn Institute (ASI) on Chemical shipping in Metasomatic procedures, which used to be held in Greece, June 3-16, 1985. The ASI consisted of 5 days of invited lectures, poster periods, and dialogue on the membership Poseidon close to Loutraki, Corinthia, via a two-day box journey in Corinthia and Attica. the second one week of the ASI consisted of an expedition aboard M/S Zeus, M/Y Dimitrios II, and the M/S Irini to 4 of the Cycladic Islands to go to, examine, and pattern notable exposures of metasomatic job on Syros, Siphnos, Seriphos, and Naxos. 9­ teenager invited lectures and 10 consultation chairmen/discussion leaders participated within the ASI, which used to be attended by way of a complete of ninety two specialist scientists and graduate stu­ dents from 15 nations. Seventeen of the invited lectures and the sphere expedition advisor are incorporated during this quantity, including 10 papers and 6 abstracts representing contributed poster periods. even supposing greater than years has elapsed because the ASI, all the papers during this quantity are brand new, and every has benefited from stimulating dialogue, severe remark, and clinical interplay, either on the ASI and within the next peer overview technique. The medical emphasis of the ASI centred at the beginning on higher mantle metasoma­ tism and crust/mantle interplay. Isotopic facts was once awarded indicating that top mantle peridotites have gone through nonequilibrium metasomatic alternate with an exterior oxygen-bearing fluid.

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Their measured whole-rock 8 7 Sr j86Sr ratios. The three sample groupings shown on this figure are based on designations made on the K20-Si02 plot of Fig. 11. Note that the Lower-K Group III shows a steep, well - defined trend, and the higher-K Group I shows a shallower, less well defined trend. (4) (5) The isotopically most primitive Alban Hills samples (those with 6 18 0 values less than +7) typically have 8 7 Sr j8 6 Sr ratios close to this value. Of all the volcanoes in Italy that have erupted leuci te-bearing rocks, and that have been investigated in any detail, the Alban Hills are by far the most uniform in 8 7Sr j86Sr • This is in keeping with the relatively primitive and simple chemical and petrological character of this volcano.

R-~-' METASEOIMENTARY BASEMENT ROCKS '5 14 13 '0 9 o 2 4 6 8 '0 '2 CoO (wI . %) '4 '6 '8 20 Figure 17. Plot of 01~0 vs. CaO for M. , 1986). Symbols are the same as in Fig. 16. All samples except a recently erupted leucite- phonolite tuff (B65g) have much higher 1) 18 0 than can be explained by simple, closed-system fractional crystallization (stippled band). 711 87S r / 86 S r Figure 18. Plot of 0 18 0 vs. 87Sr/86Sr for M. , 1986). The symbols are the same as used in Fig. 16, except that the Alban Rills data-points of Ferrara et al.

The order of Mg/ (Mg+Fe) enrichment varies haphazardly for the three silicate phases, olivine (circles), orthopyroxene (squares), and clinopyroxene (triangles), indicative of marked cation disequilibrium. The steep, heavy lines connect the olivine datapoints for each locality. The steep, light lines connect spinel datapoints (crosses). Symbols are as in Fig. 1, except that A-I = olivine diopside (Type I) samples from Arizona, and A-II = AI-augite (Type II) samples from Arizona. The numbers near the spinel data-points represent Kn values for Mg/Fe partitioning between coexisting olivine and spinel.

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