Abstract
An evaluation of Pb and Ba contents in S-type granites can provide important information on the processes of crustal partial melting. Primary low-T S-type granites, which form mainly by fluid-absent muscovite melting, may acquire a significant enrichment in Pb when compared to higher-T S-type granites for a given Ba content. We consider the following factors are responsible for this enrichment: Muscovite is a major carrier of Pb in amphibolite facies metapelites, and thus large quantities of Pb can be liberated upon its breakdown. The typical restite assemblage of Qz + Bt + Sil ± Pl ± Grt ± Kfsp that forms during low-T, fluid-absent muscovite melting can take up only minor amounts of this Pb. This is because the crystal/melt Pb distribution coefficients for these restite minerals are low to very low. Only K-feldspar is moderately compatible for Pb, with a crystal/melt distribution coefficient of ~3, but its modal content in restites is usually low. At the same time, the restite assemblage will retain much Ba owing to the very high Ba uptake in both biotite and K-feldspar, which is an order of magnitude higher than for Pb. Thus, during a low-T anatectic event involving a low degree of crustal melting, Pb (as an incompatible element) can become strongly enriched in the partial melt relative to Ba and also relative to source rock values. In the case of higher-T anatexis and larger partial melt amounts, the Pb becomes less enriched and the Ba less depleted or even enriched relative to source rock values. During fractional crystallization of a S-type granite magma, Ba behaves strongly compatibly and Pb weakly compatibly. The concentrations of both elements decrease along the liquid line of decent. Owing to this sympathetic fractionation behavior, the primary, source-related Pb–Ba fingerprint (with weak or strong Pb enrichment) remains in evolved S-type granites. This facilitates a distinction between primary low-T S-type granites, which are related to muscovite melting, and secondary low-T S-type granites that evolve through fractional crystallization from a higher-T parental magma. We show in this paper that a simple logarithmic Pb versus Ba diagram can be a valuable aid for interpreting the petrogenesis of S-type granite suites.
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Acknowledgments
This paper benefited from discussions with B.W. Chappell during his stay in Salzburg in summer 2011. We are grateful to him for allowing us using his unpublished geochemical data base for S-type granites from the Lachlan Fold Belt. Igor Broska is thanked for kindly providing us with data tables for Variscan granites from the Carpathians. Discussions with M. René, K. Verner, and J. Žak regarding the origin of some Czech granites were instructive and are gratefully acknowledged. Two anonymous reviewers and editor J. Blundy provided constructive comments and suggestions that helped to improve the manuscript.
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Finger, F., Schiller, D. Lead contents of S-type granites and their petrogenetic significance. Contrib Mineral Petrol 164, 747–755 (2012). https://doi.org/10.1007/s00410-012-0771-3
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DOI: https://doi.org/10.1007/s00410-012-0771-3