Zircon U-Pb geochronology, Hf isotopes, and geochemistry constraints on the age and tectonic affinity of the basement granitoids from the Qiongdongnan Basin, northern South China Sea

Lijun Mi Xiaoyin Tang Haizhang Yang Shuchun Yang Shuai Guo

Lijun Mi, Xiaoyin Tang, Haizhang Yang, Shuchun Yang, Shuai Guo. Zircon U-Pb geochronology, Hf isotopes, and geochemistry constraints on the age and tectonic affinity of the basement granitoids from the Qiongdongnan Basin, northern South China Sea[J]. Acta Oceanologica Sinica, 2023, 42(3): 19-30. doi: 10.1007/s13131-022-2078-1
Citation: Lijun Mi, Xiaoyin Tang, Haizhang Yang, Shuchun Yang, Shuai Guo. Zircon U-Pb geochronology, Hf isotopes, and geochemistry constraints on the age and tectonic affinity of the basement granitoids from the Qiongdongnan Basin, northern South China Sea[J]. Acta Oceanologica Sinica, 2023, 42(3): 19-30. doi: 10.1007/s13131-022-2078-1

doi: 10.1007/s13131-022-2078-1

Zircon U-Pb geochronology, Hf isotopes, and geochemistry constraints on the age and tectonic affinity of the basement granitoids from the Qiongdongnan Basin, northern South China Sea

Funds: The National Natural Science Foundation of China under contract No. 42072181.
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    Authors contributed equally to this work.
  • Figure  1.  Map showing the Qiongdongnan Basin in a regional context (a and b), and the basin tectonic units (c). Abbreviations in a: EP, Eurasian Plate; IA, India-Australian Plate; PSP, Philippine Sea Plate; SCS, South China Sea; PP, Pacific Plate; BN, Borneo.

    Figure  2.  Cathodoluminescence (CL) images of representative detrital zircons were analyzed for the U-Pb ages. The red and yellow circles denote the analytical spots for the LA-ICP-MS U-Pb dating and Lu-Hf isotopes, respectively. Numbers near the circles indicate are spot number (U-Pb ages), 207Pb/206Pb ages are selected for zircons older than 1000 Ma, and 206Pb/238U ages for zircons less than 1000 Ma.

    Figure  3.  The Th/U ratio of zircon grains with U-Pb ages. Most of them have high Th/U ratios ranging from 0.11 to 1.58, together with the euhedral-subhedral in shape and fine-scale oscillatory growth zoning in CL images (Fig. 2), suggesting igneous origin (Belousova et al., 2002; Koschek, 1993).

    Figure  4.  Zircon U-Pb concordia plots and weighted mean ages for basement granitoid in the Qiongdongnan Basin.

    Figure  5.  εHf (t) values versus U-Pb ages, illustrating the comparison of εHf (t) of zircon from the basement granitoids in the Qiongdongnan Basin. DM: depleted mantle; CHUR: Bulk earth (chondritic uniform reservoir). Hf-isotope evolution line for depleted mantle is after Griffin et al. (2000). The dotted lines in a represent average crust 176Lu/177Hf=0.015 (Griffin et al., 2002).

    Figure  6.  Geochemical features of the basement granitoids from the Qiongdongnan Basin. a. SiO2 versus K2O+Na2O (Middlemost, 1994), b. A/CNK versus A/NK diagram (Maniar and Piccoli, 1989), c. SiO2 versus K2O scheme, where the subdivisions from low-K tholeiite, calc-alkaline, high-K calc-alkaline to shoshonite are from Rickwood (1989), d. SiO2 versus P2O5, e. Rb versus Y, and f. Rb versus Th plot for identification of I-type from S-type granite (Chappell, 1999).

    Figure  7.  Chondrite-normalized REE patterns (a), and primitive mantle normalized trace element patterns (b), of basement granitoids from the Qiongdongnan Basin. Chondrite and primitive mantle values are from Sun and McDonough (1989).

    Figure  8.  Distribution of and age summary of granitoids in northern South China Sea Basin. Crosses denote samples analyzed in this study, while circles present ages reported in previous studies (blue ones, K-Ar ages from Li et al. (1999a) and Qiu et al. (1996); red ones, U-Pb ages from Cui et al. (2021), Shi et al. (2011) and Xu et al. (2016, 2017). Black curves denote basin boundary.

    Figure  9.  Ga×10 000/Al versus Ce plot for identification of A-type granite from I- and S-type granites (Whalen et al., 1987) (a), Y+Nb versus Rb plot for discriminating syn-collisional granite, volcanic-arc granite, within-plate granite, and ocean-ridge granite (Pearce et al., 1984) (b), Y versus Sr/Y plot (Defant et al., 2002) (c), and (Yb)N versus (La/Yb)N plot (Martin, 1993) (d). TTG: tonalite-trondhjemite-granodiorite; ADR: andesite-dacite-rhyolite.

    Figure  10.  Probability density plots of precambrian U-Pb ages for zircons in this study (a) and xenocrystic/inherited zircon ages in the cathaysia block (b). Data source for references (Wang et al., 2020a, b; Jiang et al., 2020) .

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  • 收稿日期:  2022-03-01
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