| Citation: |
Kai Wang, Tian-yu Zhao, Shuan-hong Zhang, 2023. Discovery of the oldest (ca. 2.87 Ga) granitic gneisses in the Qinling-Dabie Orogenic Belt: Direct evidence of Mesoarchean crust, China Geology, 6, 533-535. doi: 10.31035/cg2022084
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Discovery of the oldest (ca. 2.87 Ga) granitic gneisses in the Qinling-Dabie Orogenic Belt: Direct evidence of Mesoarchean crust
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References
Wang K, Dong SW, Yao WH, Zhao TY. 2020. Nature and Evolution of Pre-Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications. Acta Geologica Sinica (English Edition), 94(6), 1731–1756. doi: 10.1111/1755–6724.14601. Wang X, Ma CQ, Deng JL, Wu H. 2020. Discovery of ~2.5 Ga amphibolite at Liuping Town of Susong County in the mid-eastern region of the Yangtze Block. Geology in China, 47, 1262–1263. Wu YB, Zheng YF, Gao S, Jiao WF, Liu YS. 2008. Zircon U-Pb age and trace element evidence for Paleoproterozoic granulite-facies metamorphism and Archean crustal rocks in the Dabie Orogen. Lithos, 101, 308–322. doi: 10.1016/j.lithos.2007.07.008. -
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Kai Wang, Tian-yu Zhao, Shuan-hong Zhang, 2023. Discovery of the oldest (ca. 2.87 Ga) granitic gneisses in the Qinling-Dabie Orogenic Belt: Direct evidence of Mesoarchean crust, China Geology, 6, 533-535. doi: 10.31035/cg2022084
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Figure 1.
a‒Schematic tectonic map of the Dabie Orogenic Belt showing the main litho-tectonic units and their tectonic boundaries. Locations of published Archean and earliest Paleoproterozoic rocks and their age ranges are highlighted in red. Detailed data and references are summarized by Wang K et al. (2020). BZ‒Beihuaiyang zone; NDZ‒Northern Dabie zone; CDZ‒Central Dabie zone; SDZ‒Southern Dabie zone; SZ‒Susong Complex zone. The inset map shows the locations of the Qinling-Dabie Orogenic Belt and the study area (Susong) relative to the North China Block and the Yangtze Block, and major Archean provinces in the Qinling-Dabie Orogenic Belt and their ages are highlighted in yellow. b‒simplified geological map of the study area after 1∶50000 geological map of the Tingqianjie area showing sample location. c‒representative field photo of the studied granitic gneiss. d‒photomicrograph showing typical textures and mineral assemblages under cross-polarized light for the studied granitic gneiss. Bt‒biotite; Kfs‒potassium feldspar; Pl‒plagioclase; Qz‒quartz.
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Figure 2.
CL images of representative zircons from the granitic gneiss sample (a) and their plots on the U-Pb Concordia diagram (b), respectively. Yellow circles in (a) are spots for U-Pb analyses, and yellow and white digits are spot numbers and corresponding 207Pb/206Pb ages, respectively. “n” in (b) represents the number of zircon analyses.