Systematic use of trace element distribution patterns in log-log diagrams for plutonic suites |
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| Institution: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Geological Sciences and Geological Engineering, Queen''s University, Kingston, ON K7L2N8, Canada;4. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Trace element modelling has been widely used for petrogenetic interpretation of basaltic systems. This paper indicates how to select trace element pairs having very different bulk distribution coefficients (D) which when plotted on simple log-log diagrams permit the identification of the main magmatic process (magma mixing, partial melting, fractional crystallization) involved in the genesis of plutonic rocks. Fractional crystallization gives a straight line on such a diagram with a strong decrease of the compatible element whereas the concentrations of the element with D ? 1 increase slowly. A similar evolution of the solids in equilibrium is observed and when data of at least one of the cumulates are directly available, it is possible to calculate the D and F parameters of the sequence of fractional crystallization.An example of this procedure is shown for a French Hercynian plutonic suite: the basic suite of Variscan Corsica. |
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