晋东北地区侏罗纪地层划分、时代重新厘定及其地质意义

（1．中国地质科学院地质力学研究所，北京100081；2．中油辽河油田分公司，辽宁盘锦124010）

提要：利用地层序列中火…碎屑岩、凝灰岩及其火山岩锆石U-Pb同位素测年，对晋东北地区侏罗纪地层时代进行了重新厘定。取得了以下主要认识：(1)确认宁武一静乐盆地下侏罗统永定庄组的存在；(2)宁武一静乐盆地天池河组可以与鄂尔多斯盆地安定组相对比，归属于中侏罗统；(3)浑源盆地髫髻山组应归属于中侏罗统上部，该套火山岩地层在整个燕一辽地区具有穿时性；(4)广灵盆地中侏罗统窑坡组底部厚层砾岩的沉积时代可能与燕山造山带的南大岭组相当，应该属于早侏罗世至中侏罗世早期构造运动的产物。通过地层序列的重新厘定，确认了159.0~(152.77±0.63) Ma区域角度不整合的存在，该期构造运动可能与侏罗纪东哑大陆多向汇聚产生的远程效应有关。

关键词：侏罗纪；永定庄组；天池河组；髫髻山组；窑坡组

中图分类号：P534.52  文献标志码：A    文章编号：1000-3657(2015)04-1046-13

 Redefinition of Jurassic strata in northeastern Shanxi and its tectonic implications

LI Zhen-hong', YANG Yong-heng2, QU Hong-jie', GONG Wang-binl

     (l. Institute of Geomechanics, Chinese Academy of Geological Sciences, Bezjing 100081, China; 2. Liaohe Oilfield of CNPC,Panjing 124010, Liaoning, China)

Abstract: Based on regional stratigraphic correlation and using zircon dating method of tuff and volcaniclastic rocks in the Jurassicstratigraphic sequence, the authors re-divided and defmed Jurassic stratigraphic sequence. Some conclusions have been reached: (1)The stratigraphic age of Yongdingzhuang Formation in Ningwu- Jingle basin is identified as the lower Jurassic; (2) The middleJurassic Tianchihe Formation may be compared to Anding Formation of Ordos basin, and therefore the stratigraphic age ofAndingFormation in the controversy should be redefmed to the middle Jurassic; (3) The Tiaojishan Formation is redefined to the middleJurassic in Huyuan basin, this stratum has the diachronistic nature in the Yanshan orogenic belt; (4) The sedimentary time of basalconglomerate of Yaopo Formation in Guangling basin can be equivalent to Nandaling Formation of Yanshan orogenic belt, the basalconglomerate should be the product of tectonic movement in early Jurassic and early middle Jurassic. By the redefinition andredivision of Jurassic stratigraphic sequence in northeastern Shanxi, the angle disconformity between 159.OMa and (152.77±0.63)Ma is confirmed, and this is dynamically associated with distant field effects produced by synchronous convergences toward theEast Asia continent of different plates (Siberia, Paleo-Pacific, Tethys).

 Key words: Jurassic; Yongdingzhuang Formation; Tianchihe Formation; Tiaojiashan Formation;Yaopo Formation

 About the first author: LI Zhen-hong, male, born in 1973, doctor, majors in sedimentology; E-mail: lizhennhong@126.com.

结论

    通过本次研究对晋东北地区侏罗纪地层的时代归属进行了重新的厘定：(1)确认了宁武一静乐盆地下侏罗统永定庄组的存在，将中侏罗统天池河组的时代归属划归为中侏罗统；(2)浑源盆地髫髻山组玄武一安山岩喷发时限应为中侏罗世晚期；(3)广灵盆地窑坡组底部厚砾岩层应为早侏罗世至中侏罗世早期构造运动的产物，在地层时代上应与燕山造山带的南大岭组时代相当。同时，根据地层接触关系推测出两期重要的构造运动：晚三叠世至早侏罗世华北克拉通的整体隆升剥蚀，晚侏罗世东亚大陆的多向汇聚（159.0 Ma—152.77±0.63 Ma）。

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