Zircon SHRIMP U-Pb ages of the “Xinghuadukou Group” in Hanjiayuanzi and Xinlin areas and the “Zhalantun Group” in Inner Mongolia, Da Hinggan Mountains

A report is presented of SHRIMP zircon U-Pb dating data of meta-igneous and meta-sedimentary rocks of the Xinghuadukou Group(Xinlin-Hanjiayuanzi area,Heilongjiang Province)and meta-volcanic rocks of the Zhalantun Group(Zhalantun district,Inner Mongolia).The SHRIMP analyses show that the meta-igneous rocks from the Xinghuadukou Group formed at 506±10―547±46 Ma,belonging to Early-Middle Precambrian,whereas the meta-sedimentary rocks yielded detrital zircons,with ages of 1.0―1.2,1.6―1.8 and 2.5―2.6 Ga,indicative of deposition age at least<1.0 Ga. Meta-basic volcanic rocks from the Zhalantun Group have a formation age of 506±3 Ma.These data suggest that both the Xinghuadukou and Zhalantun Groups formed during Cambrian and/or Neoproterozoic time,rather than Paleoproterozoic time as previously thought.Early Precambrian inherited zircons in the meta-igneous rocks and numerous Precambrian detrital zircons in the meta-sedimentary rocks imply that these rocks were formed proximal to older crust.It is inferred that the Xinghuadukou and Zhalantun Groups represent Cambrian and/or Neoproterozoic vol- cano-sedimentary sequences formed in an active continental margin setting.     

早期汉人入辽脉络分析——以韩匡嗣夫妇墓志材料为中心的考察

辽朝统治前期,大量汉人被俘入辽,与契丹等北方族群混居。绝大部分被俘汉人从事农业,手工业,商业,仅有小部分汉人获得官位,跻身统治阶层内部,拥有显赫政治地位与社会地位,最典型的就是玉田韩氏家族。韩家二代韩匡嗣历经辽代五朝皇帝,父辈入辽及个人发迹经过与辽初的汉族与契丹族群互动有着密切的关系。韩氏家族"被俘成为宫分人—为仕/建立军功—与大族联姻"是入辽汉人生存发展的显著模式。本文希望藉由韩氏家族第二代韩匡嗣夫妇墓志的分析梳理,从迁徙路线、社会流动、族群互动方面挖掘线索,把握早期汉人入辽的脉络。     

大跨度公路隧道有限元模拟研究

采用GeoFBA有限元软件,应用弹塑性理论,对沈大高速公路韩家岭大跨度隧道进行了有限元模拟,并对其稳定性进行分析,以保证隧道运行安全经济合理.所得计算结果和有关结论同时填补了我国在大跨度公路隧道分析方面的空白,为隧道的设计及施工提供重要的参考依据.