Abstract
The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses for the Jinlongyan (JLY) granite in northwest Fujian Province, southeast China. LA–ICP–MS zircon U–Pb dating yielded a weighted average 206Pb/238U age of 224.1 ± 3.3 Ma. The granite is mainly comprised of K-feldspar, plagioclase, quartz, biotite and minor amphibole. It is characterized by enrichments in Rb, Th, REEs (total REE = 295.1–694.3 ppm), and HFSEs (e.g., Zr = 289–520 ppm, Hf = 9.3–15.0 ppm, Y = 36.2–68.2 ppm) but depletions in Ba, Sr, Eu and Ti. The granite is metaluminous to weakly peraluminous and show a clear A-type granite geochemical signature with high SiO2 (70.89 wt%–75.76 wt%), total alkalis (Na2O + K2O = 7.51 wt% –8.72 wt%), Ga/Al ratios (10000 Ga/Al = 2.72–3.43). In-situ zircon Hf isotope analysis shows their εHf(t) values ranging from −7.2 to −3.2, with Mesoproterozoic T2DM ages (1308–1525 Ma). Whole-rock Nd isotope data show their εNd(t) values in the range of −9.5 to −9.1 and yield paleoproterozoic TDM ages (1606–1985 Ma). These characteristics indicate that the JLY A-type granite magma was formed by the partial melting of Meso-Paleoproterozoic crust rocks in the Cathaysia Block. Our study of the JLY A-type granite, together with other Triassic A-type granites in South China, defines an extensional environment in the late Triassic which probably was caused by the collision of the South China Block with Indochina Block.
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Acknowledgements
We thank Huadong Gong for his help in the determination of zircon U–Pb age using LA–ICPMS, Lei Xu for her help during zircon Hf isotopic analyses by LA–MC–ICPMS, and Wei Pu for his help in Sr–Nd isotopic analyses. We are also grateful to the guest editors and the reviewer Tynie Alfante for constructive suggestions and criticisms in reviewing the manuscript. The work was financially supported by the Chinese National Natural Science Foundation (41373024) and Opening Foundation of State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (201307).
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Cai, D., Zhao, J., Tang, Y. et al. Geochemistry, petrogenesis and tectonic significance of the late Triassic A-type granite in Fujian, South China. Acta Geochim 36, 166–180 (2017). https://doi.org/10.1007/s11631-017-0143-9
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DOI: https://doi.org/10.1007/s11631-017-0143-9