| Citation: | Ji-Biao Zhang, Xiao-Zhong Ding, Yan-Xue Liu. Zircon SHRIMP U-Pb Ages, Geochemistry and Nd-Hf Isotopes of ~1.0 Ga A-Type Felsic Rocks in the Southwestern Yangtze Block, South China: Petrogenesis and Tectonic Implications. Journal of Earth Science, 2023, 34(2): 504-517. doi: 10.1007/s12583-020-1090-7
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The petrogenesis and tectonic affinity of Late Mesoproterozoic igneous rocks in the Yangtze Block are important to understand its tectonic evolution within the context of the Rodinia supercontinent's reconstruction. Here, we report the SHRIMP zircon U-Pb ages, geochemistry, and Nd-Hf isotopic data for dacite from the Zegu Formation of the Dengxiangying Group in southwestern Yangtze Block. The crystallization age of the Zegu dacite is 1 037 Ma. These rocks have relatively high Ga, Zr, Hf, and HREE contents, as well as high (10 000 × Ga)/Al (2.7-2.9) and FeOt/MgO (3.8-10.5) ratios, showing a geochemical affinity of A-type granitoids. Moreover, they are characterized by negative
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