Zircon U-Pb Dating and Lu-Hf Isotope Results for Feidong Complex: Implications for Coherent Basement of the Yangtze Craton
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摘要: 扬子克拉通广泛存在太古宙-古元古代的结晶基底，但关于扬子克拉通早前寒武纪基底形成和演化的基本问题尚未完全解决，特别是基底是由多个块体拼合而成还是一个统一的结晶基底尚无定论.对扬子北缘张八岭隆起内肥东杂岩的片麻岩、斜长角闪岩及侵入其中的花岗岩进行了同位素地质年代学和地球化学研究，发现片麻岩具有相似的原岩年龄，分别为2 449±17 Ma、2 444±15 Ma、2 495±23 Ma、2 478±24 Ma，斜长角闪岩和A型花岗岩的原岩年龄分别为2 032±35 Ma和747±4 Ma，表明肥东杂岩出露有扬子克拉通晚太古-古元古代的结晶基底.片麻岩锆石Hf同位素组成相似，εHf（t）平均值为-3.6±0.5，两阶段Hf模式年龄（TDM2）范围主要在3.3~3.0 Ga，平均值为3 185±31 Ma，说明这一期约为2.45~2.50 Ga的岩浆活动主要是对扬子北缘古-中太古代地壳的再造.扬子北缘的鱼洞子群和陡岭杂岩都经历了相同性质的岩浆事件，同时扬子克拉通广泛出现约2.50 Ga的碎屑锆石和捕获锆石，表明扬子克拉通结晶基底是统一的.Abstract: Archean-Paleoproterozoic basement is widespread in the Yangtze craton. However, many essential problems about the formation and evolution of the Precambrian basement of the Yangtze craton are still open, especially whether the basement of the Yangtze craton is coherent or composed of multiple blocks. A geochronological and geochemical study was carried out for the felsic gneiss, amphibolite and intrusive granite from the Feidong complex in the Zhangbaling uplift at the northern margin of the Yangtze craton. Zircon U-Pb dating gives similar protolith ages of 2 449±17 Ma, 2 444±15 Ma, 2 495±23 Ma and 2 478±24 Ma for the felsic gneisses. The ages of the amphibolite and A-type granite are 2 032±35 Ma and 747±4 Ma, respectively. This indicates that the Late Archean-Paleoproterozoic crystalline basement of the Yangtze craton cropped out in this area. The zircon εHf(t) values of the ca. 2.45-2.50 Ga gneisses are negative with an average value of -3.6±0.5 and the corresponding two-stage Hf model ages (TDM2) range from 3.3 to 3.0 Ga with an average of 3 185±31 Ma, which shows that the 2.45-2.50 Ga magmatic event is mainly the reworking of Paleo-Mesoarchean crust. The occurrence of similar magmatic rocks in other terranes, including the Yudongzi Group and Douling complex in the northern Yangtze craton, as well as detrital zircons and volcanic xenocrystals with similar ages widespread in the Yangtze craton, suggests that the basement is coherent throughout the whole Yangtze craton.
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Key words:
- Archean-Paleoproterozoic /
- Feidong complex /
- Yangtze craton /
- crystalline basement /
- geochemistry
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图 1 采样剖面图(a)；侵入花岗岩接触关系(b)；BIF出露情况(c)；部分熔融现象(d)，浅色体为新成体，暗色体为残余体
Fig. 1. The sketch map of sampling profile (a); contact relationship of intrusive granite (b); BIF in outcrop (c); partial melting (d), the leucosome is neosome and the melanosome is the residual body
图 2 肥东群露头主要岩石显微镜下照片
矿物缩写：Amp.角闪石；Pl.斜长石；Kfs.钾长石；Qz.石英；Ms.白云母；Bt.黑云母；Grt.石榴石；Mag.磁铁矿；Chl.绿泥石
Fig. 2. Photomicrographs of main rocks from the Feidong Group
图 5 肥东杂岩样品锆石LA-ICP-MS定年数据
蓝圈代表边部分析点，红圈代表核部分析点
Fig. 5. Concordia diagrams of LA-ICP-MS zircon U-Pb data of samples from the Feidong complex
图 6 球粒陨石标准化的稀土元素模式配分图(a)和原始地幔标准化的微量元素蛛网图解(b)以及A型花岗岩判别图解(c，d)
据Whalen et al. (1987). A代表A-type granite；I代表Ⅰ-type granite；S代表S-type granite；FG代表Fractionated felsic granite；OGT代表Unfractionated M-, I- and S-type granites
Fig. 6. Chondrite-normalized REE diagram (a), primitive mantle-normalized spidergram (b), discrimination diagrams for A-type granites (c, d)
图 7 肥东杂岩片麻岩锆石εHf(t)值和两阶段模式年龄(TDM2)频率分布模式直方图
Fig. 7. Histograms of zircon εHf(t) values and two-stage Hf model age (TDM2) for gneiss from the Feidong complex
图 8 扬子和华北克拉通碎屑锆石U-Pb年龄分布
数据来源于Wan et al.(2018)及其参考文献
Fig. 8. Comparison of Precambrian zircon U-Pb age spectra of the Yangtze craton and North China craton
图 9 华北克拉通东部和肥东群2.5 Ga锆石εHf(t)-age图解
岩浆和变质锆石数据来源于Zhang et al.(2014)搜集的华北克拉通东部太古代‒古元古代(2.5 Ga前后)基底岩石
Fig. 9. Zircon εHf(t)-age diagram for the eastern block of the North China craton and Feidong Group
图 10 肥东杂岩、陡岭杂岩和鱼洞子群约中2.5 Ga锆石εHf(t)-age图解
陡岭杂岩数据来源于Hu et al.(2013); Nie et al.(2016); 鱼洞子群数据来自Hui et al. (2017); Zhou et al. (2018)
Fig. 10. Zircon εHf(t)-age diagram for the Feidong complex, Douling complex and Yudongzi Group
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