Abstract
Lamprophyres are mantle-derived rocks characterized by enrichment of incompatible elements and volatiles; however, the origin of their enriched sources remains enigmatic. Here we present zinc isotopic data for contemporary Mesoproterozoic (~ 1.1 Ga) lamprophyres from three localities of the Eastern Dharwar Craton. The Mudigubba and Kadiri lamprophyres with island-arc basalt (IAB)-like trace element features, such as positive Pb and negative Nb–Ta, Zr–Hf and Ti anomalies, have mid-ocean ridge basalt (MORB)-like δ66Zn values ranging from + 0.22‰ to + 0.29‰. In contrast, the Udiripikonda lamprophyre shows higher-than-MORB δ66Zn values of + 0.39‰ to + 0.48‰ and elemental features of intra-plate magmas with a lack of pronounced Nb–Ta-negative anomalies. Based on the covariations between Zn isotopes and trace element ratios, we infer that the Mudigubba and Kadiri lamprophyres with MORB-like Zn isotopes and high Ba/La, K/Nb and low Nb/La, Ce/Pb ratios are inherited from sub-continental lithospheric mantle metasomatized by fluids derived from a subducted slab. On the contrary, the higher-than-MORB Zn isotopic compositions, with low Ba/La, K/Nb and high Nb/La, Ce/Pb, K/U and Ba/Th ratios for the Udiripikonda lamprophyre are inferred to derive from lithospheric mantle enriched by carbonatitic melts or subducted carbonate-bearing sediments within the mantle transition zone. Hence, our study suggests that contemporary lamprophyres can be derived from disparate enriched mantle sources.
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Acknowledgements
We are grateful to Dan-Dan Li for assistance with the Zn isotopic analyses. Rong Xu and an anonymous reviewer are warmly thanked for their detailed and instructive reviews, and the editorial support of Hans Keppler is also greatly appreciated. This work was supported by the National Natural Science Foundation of China (42130310 and 41802045). LK was supported by the EXPRO 2019 project (No. 19-29124X) of the Czech Science Foundation and the RVO 67985831 project of the Institute of Geology of the Czech Academy of Sciences. NVCR thanks BHU for awarding him a faculty incentive grant (IOE). We are indebted to Daniel Müller for his comments on an earlier draft of this manuscript.
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Liu, JQ., Chen, LH., Wang, XJ. et al. Zinc isotopes reveal disparate enriched sources of contemporary lamprophyres in Eastern Dharwar Craton. Contrib Mineral Petrol 178, 89 (2023). https://doi.org/10.1007/s00410-023-02073-1
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DOI: https://doi.org/10.1007/s00410-023-02073-1