Detrital Zircon U-Pb Geochronology and Hf Isotopes of Mesoproterozoic Metasedimentary Rocks in Dabie Orogen and Its Geological Significance
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摘要: 大别造山带位于扬子陆块北缘，近年来的研究显示其发育太古代-古元古代的结晶基底，但一直缺乏中元古代的物质信息.首次报道了大别造山带核部一套中元古代“变砂岩-大理岩”变沉积岩组合，通过对该套地层的3个样品碎屑锆石U-Pb年代学和Lu-Hf同位素特征分析，显示最年轻的锆石平均年龄分别为：1 556±13 Ma、1 541±20 Ma和1 584.3±24 Ma，在误差范围内基本一致，说明该套地层的形成时代为中元古代，锆石变质增生边记录该套地层经历了124.1±2.3 Ma的变质事件，碎屑锆石年龄频谱和Lu-Hf同位素特征显示该套地层物源特征与神农架群一致；碎屑锆石峰值年龄2 682 Ma，2 461 Ma记录了“大别陆块”结晶基底两期重要生长事件，峰值年龄2 043 Ma，1 803 Ma和1 572 Ma显示“大别地块”可能参与Columbia超大陆聚合-裂解事件，在新元古代早期与“黄陵陆核”拼合而成为扬子陆块统一基底的重要组成部分.Abstract: The Dabie orogen is located in the north margin of the Yangtze block. Recent studies show that the Dabie orogen has Archean-Paleoproterozoic crystalline base, but it has been lack of Mesoproterozoic material information all the time. In this article, it reports a set of Mesoproterozoic sedimentary rocks mainly composed of "metasandstone-marble" in the Dabie orogen for the first time. It analyzes the detrital zircon U-Pb chronology and Lu-Hf isotopic characteristics of the three samples in this strata, and the results show that the youngest average ages of three samples are: 1 556±13 Ma, 1 541±20 Ma and 1 584.3±24 Ma. This three ages are basically same within the error-range, which shows that the age of this strata should be the Mesoproterozoic. The metamorphic rims of detrital zircon record a metamorphic event at the age of 124.1±2.3 Ma, the U-Pb age histograms and Lu-Hf isotopes shows that the provenance characteristics of this strata are consistent with the Shennongjia Group. The main peaks of detrital zircon U-Pb ages of 2 682 Ma and 2 461 Ma record two important growth events of Dabie crystalline basement, and the peaks of 2 043 Ma, 1 803 Ma, 1 572 Ma implicate that the "Dabie block" may have participated in the aggregate event of Columbia supercontinent and become a part of it, and the "Dabie block" separated from the Columbia supercontinent during the breaking up event, and collided with the "Huangling continental nucleus" and became an important part of the basement of the Yangtze block during the Early Neoproterozoic.
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图 1 大别造山带区域地质简图及采样点
据Wu et al.（2008）；邱啸飞等（2020）；郭盼等（2021）修改
Fig. 1. Sketch geological map for the Dabie orogen and sampling location
图 2 大别造山带中元古代变沉积岩典型地质剖面图
Fig. 2. Typical geological profile of Mesoproterozoic metasedimentary rocks in the Dabie orogen
图 3 样品野外与镜下特征
a. D2247-2条带状角闪石辉石石英岩呈“夹层”状产出在大理岩之中；b. D2247-2条带状角闪石辉石石英岩镜下特征（正交镜）；c，d. PM209-22-2含二长辉石石英岩野外和镜下特征（正交镜）；e，f. PM205-40-1含矽线二云钾长片麻岩野外和镜下特征（单偏光镜）；Hbl.角闪石；Px.辉石；Qtz.石英；Pl.斜长石；Kf.钾长石；Sil.矽线石；Bi.黑云母；Ms.白云母
Fig. 3. Field outcrops and photomicrographs of samples
图 4 样品D2247-2、PM209-22-2和PM205-40-1不同年龄锆石代表性CL图像特征
白色实线圈为U-Pb测试点，黄色虚线圈为Lu-Hf测试点
Fig. 4. Typical CL images of different ages from the samples of D2247-2, PM209-22-2 and PM205-40-1
图 5 锆石U-Pb年龄谐和图、频率直方图和平均年龄图
Fig. 5. The U-Pb concordia diagrams, frequency histograms and mean age diagrams
图 6 样品D247-2碎屑锆石U-Pb年龄与εHf(t)关系（神农架群数据肖志斌，2012）
Fig. 6. U-Pb age versus εHf(t) of detrital zircons from sample of D22247-2(after Xiao, 2012)
图 7 分类回归树图和“变砂岩-大理岩”组合中碎屑锆石的原岩分类回归结果（Belousova et al. 2002）
Fig. 7. Classification and regression tree(CART-tree) and source rock types of detrital zircons from the "metasandstone-marble"(after Belousova et al. 2002)
图 8 “变砂岩-大理岩”组合中不同峰值年龄碎屑锆石U/Yb-Hf和U/Yb-Y图解（Grimes et al., 2007）
Fig. 8. Plots of U/Yb-Hf and U/Yb-Y for different peak ages of detrital zircons from the "metasandstone-marble"
图 9 大别地区中元古代“变砂岩-大理岩”组合与神农架群、扬子陆块碎屑锆石频谱特征对比
数据引自：Yan et al.（2011）、Duan et al.（2012）、She et al.（2012）、Wu et al.（2010）、Xu et al.（2012）、肖志斌（2012）、李怀坤等（2013b）、Wang et al.（2013）
Fig. 9. Detrital zircon U-Pb age relative probability diagrams plotted for comparison from Mid-Proterozoic strata of Dabie orogen, Shennongjia Group and Yangtze block
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