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 name web page, this e-book is an outgrowth of the NATO complicated learn Institute (ASI) on Chemical shipping in Metasomatic methods, which used to be held in Greece, June 3-16, 1985. The ASI consisted of 5 days of invited lectures, poster classes, 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 day trip aboard M/S Zeus, M/Y Dimitrios II, and the M/S Irini to 4 of the Cycladic Islands to go to, research, and pattern awesome 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 expert scientists and graduate stu­ dents from 15 international locations. Seventeen of the invited lectures and the sphere day trip consultant are incorporated during this quantity, including 10 papers and 6 abstracts representing contributed poster periods. even though greater than years has elapsed because the ASI, the entire papers during this quantity are brand new, and every has benefited from stimulating dialogue, serious remark, and clinical interplay, either on the ASI and within the next peer assessment method. The clinical emphasis of the ASI concentrated in the beginning on higher mantle metasoma­ tism and crust/mantle interplay. Isotopic proof was once provided indicating that top mantle peridotites have passed through nonequilibrium metasomatic alternate with an exterior oxygen-bearing fluid.

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The most highly differentiated samples (Aa, A-C, and C) display the highest 0 18 0 values, suggesting either a process of combined assimilation-fractional crystallization (AFC, see Fig. 13) and/or a process of mixing of high- 18 0 anatectic magmas with the undersaturated Roman magmas (Taylor and Turi, 1976). Mixing curves are essentially straight lines on diagrams like Fig. 17, because the oxygen contents of most rocks and magmas are similar. Note that the simple mixing line between average Tuscan metasedimentary basement and the primi ti ve Vulsini A* magma-type passes very close to two lava samples from the Torre Alfina locality, which is one of the earliest Vulsini lavas, and is a lava locality well known for its high content of sedimentary xenoliths.

9~5 Mg/(Mg + Fe) ATOM RATIO (-Mg numbed Figure 7. Plot of 018o- o livine vs. the Mg number (atom % Mg/Mg+Fe) of the olivine (after Gregory and Taylor, 1986b). Also plotted are the Mg numbers of coexisting spinel, orthopyroxene and clinopyroxene; horizontal tie lines connect the silicate minerals from each individual sample. Filled symbols are for garnet peridoti tes. Open symbols are for spinel peridotites. 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.

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