Abstract
Small dykes are traditionally considered as rapidly quenched bodies that preserve information on the parental liquid composition. This is because a fast cooling regime in small dykes promotes magma quenching that impedes any cumulate growth processes. However, the assumption appears to be not universally valid. A 16 cm thick, fine-grained, dacitic dyke from Southern Urals has revealed a remarkable internal zonation showing a systematic inward increase in normative An (100An/(An+Ab)), normative Opx, and whole-rock MgO and FeO, and a decrease in normative Pl content, whole-rock SiO2, Na2O, Ba and Sr. All these compositional trends indicate that the dyke becomes more primitive in composition inwards from its margin the opposite to normal fractionation. This chemical zonation is best explained by in situ cumulate growth against dyke sidewalls from flowing magma, a process resulting in a progressive inward increase in the proportion of cumulus plagioclase and pyroxenes. This suggests that, despite being fine-grained, the dacitic dyke should be interpreted as a cumulate that provides only indirect information on the parental magma composition.
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Acknowledgements
We thank Evgeny Pushkarev for organizing fieldwork in the Urals as well as help and good advice with many aspects of this study. Richard James is greatly thanked for encouraging comments on the paper as well as editing that led to improvement in the wording of the text. We are indebted to Jouni Vuollo as an official reviewer of this paper for his helpful comments and suggestions. The authors are also very grateful to Rajesh K. Srivastava for the invitation to contribute to this IDC-6 volume. The research was supported by grants from the Finnish Academy of Science and the Renlund Foundation, Finland.
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Chistyakova, S.Y., Latypov, R.M. (2011). Small Dacite Dyke, Southern Urals, Russia: Rapidly Quenched Liquid or Fine-Grained Cumulate?. In: Dyke Swarms:Keys for Geodynamic Interpretation. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12496-9_29
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DOI: https://doi.org/10.1007/978-3-642-12496-9_29
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