Home > Archive>Volume 97, Issue 2, 2023 >449-468. DOI:10.1111/1755-6724.15006
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This study was supported by the Deep Resources Exploration and Mining Project (Grant No. 2019YFC0605202) and China Geological Survey Project (Grant Nos. DD20221684, DD20221795, DD20201173). We would like to thank Jiao Tianlong, Zhou Qunmao, Wu Zeyou, and Chen Riming for their help during fieldwork. We would also like to thank Dr. Zhang Han for his in-depth interpretations of the chronological data.

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    Abstract:

    The Nanyuan Formation contains information related to the Mesozoic tectonic transformation. In this study, three representative profiles were surveyed from the Nanyuan Formation, and multiple analyses were conducted. Zircon U-Pb dating yielded their ages as approximately 158–146 Ma. The volcanic rocks are enriched in Rb, Th, U, K, and Pb and depleted in Nb, Ta, P, and Ti, implying their affinity for I-type granites. The εNd(t) values (?8.3 to ?6.0), (87Sr/86Sr)i values (0.7077–0.7094) of the volcanic rock, and εHf(t) values (?8.71 to 0.12) of the Mesozoic zircons suggest that the Nanyuan Formation magma originated in the lower crust with the involvement of depleted mantle materials. The parent rocks of the rhyolitic and dacitic volcanic rocks formed by partial melting of basement rocks in South China and the andesitic volcanic rocks were derived from partial melting of the metasomatites generated by slab-mantle interaction. The fractional crystallization also played an important role in later stage. Discrimination diagrams of the volcanic rocks indicated that they formed in a volcanic arc environment. Combined with previous data, the Nanyuan Formation recorded subduction of the Paleo-Pacific Plate before regional tectonic transformation. The compressive stress field endured until the end of the Late Jurassic.

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WANG Dongsheng, LI Jinwen, SHE Hongquan, WANG Kunming, YANG Junzhi, REN Chenghao.2023.[J]. Acta Geologica Sinica(),97(2):449-468

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History
  • Received:May 15,2022
  • Revised:September 18,2022
  • Online: April 24,2023
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