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首页> 外文期刊>Science in China. Series D, Earth sciences >In situ zircon Hf isotopic, U-Pb age and trace element study of monzonite xenoliths from Pingquan and Fuxin basalts: Tracking the thermal events of 169 Ma and 107 Ma in Yanliao area
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In situ zircon Hf isotopic, U-Pb age and trace element study of monzonite xenoliths from Pingquan and Fuxin basalts: Tracking the thermal events of 169 Ma and 107 Ma in Yanliao area

机译：平泉和阜新玄武岩蒙脱石异岩的原位锆石H同位素，U-Pb年龄和微量元素研究：追踪燕辽地区169 Ma和107 Ma的热事件

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摘要

K-Ar ages of the Mesozoic (92-100 Ma) Fuxin alkalic basalts (western Liaoning Province) and the Tertiary (23-45 Ma) Pingquan alkalic basalts (eastern Hebei Province), and the results of in situ zircon U-Pb dating, Hf isotope and the trace elements from three monzonite xenoliths carried in the alkalic basalts are reported. The crust-mantle interaction occurring in the Yanshan intracontinental orogenic belt is also discussed. Fuxin zircons show highly uniform U-Pb age ((169+-3) Ma). More than 95% Pingquan zircons display the age of (107+-10) Ma except two are 2491 Ma and 513 Ma respectively. Zircons with the ages of (169+-3) Ma have ε_(Hf) close to zero. ε_(Hf) of the zircons with the ages of (107+-10) Ma are mainly at -11.5--16.3, showing the crustal derivation. Fuxin zircons contain low Nb, Ta, Sr, Th, U contents, low and narrow Hf model ages (0.87-1.00 Ga), which reflect that the source materials of the monzonite xenoliths are young to Pingquan (focus at (1.28+-0.08) Ga). High contents of the incompatible elements, and wide range of Hf model ages (0.89-2.56 Ga) in Pingquan zircons suggest a more complex source and the highly crustal maturity in their petrogenesis. Comprehensive information including the published data indicates that J_3-K_1 is the key period of the deep processes and shallow tectonic reverse in the Yanliao area. However, the processes were highly heterogeneous in spatial and in temporal.
机译：阜新碱玄武岩（辽西）和第三纪平泉碱玄武岩（河北省）的中生代（92-100 Ma）和第三纪（23-45 Ma）的K-Ar年龄，以及原位锆石U-Pb定年的结果报道了碱性玄武岩中Hf同位素和三种蒙脱石异岩中的痕量元素。还讨论了在燕山陆内造山带中发生的地壳-地幔相互作用。阜新锆石显示出高度均匀的U-Pb年龄（（169 + -3）Ma）。平泉锆石的年龄超过（95 + -10）Ma的比例超过95％，其中两个分别为2491 Ma和513 Ma。 （169 + -3）Ma年龄的锆石的ε_（Hf）接近于零。 （107 + -10）Ma年龄的锆石的ε_（Hf）主要在-11.5--16.3，表现出地壳的推导。阜新锆石的Nb，Ta，Sr，Th，U含量低，Hf模型年龄低且窄（Hg模型年龄为0.87-1.00 Ga），这反映了蒙脱石异种岩的原料对平泉还很年轻（焦点位于（1.28 + -0.08） ）Ga）。平泉锆石中不相容元素的含量高，Hf模型年龄范围广（0.89-2.56 Ga），表明其成因更为复杂，地壳成熟度也很高。包括已发表数据在内的综合信息表明，J_3-K_1是延辽地区深部过程和浅部构造逆转的关键时期。但是，这些过程在空间和时间上高度异质。

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