冀北围场山湾子中生代地层层序的重新厘定  

Redefinition of the Shanwanzi Mesozoic stratigraphic sequence in the north Hebei province

作　　者：孙肖[1] 邓绍颖 吴洋[1] 刘洪章[1] 申晋青 

机构地区：[1]河北省区域地质矿产调查研究所,河北廊坊065000

出　　处：《地质调查与研究》2017年第1期1-12,共12页Geological Survey and Research

基　　金：国家地质调查项目"河北1/5万三义号;大帐房;竹笠沟;山湾子幅区域地质矿产调查(1212011220488)"

摘　　要：冀北围场县山湾子中生代地层为一套以中酸性火山岩为主夹碎屑岩的建造。在1/5万地质调查中新发现4套厚度大小不等、横向延伸较稳定沉积岩层,2个平行不整合面及火山岩锆石U-Pb LA-ICP-MS年龄128~155Ma。经区域对比分析,将平行不整合面之上一套形成时限约为143~155 M的酸性火山岩夹中性火山岩、碎屑岩建造厘定为上侏罗统满克头鄂博组、玛尼吐组;其下形成时限为128~141 Ma的中酸性火山岩夹碎屑岩建造厘定为下白垩统张家口组、大北沟组和义县组。The Shanwanzi Mesozoic basin, located in the north margin of the North China Block, consists of maily a set of acidic volcano formation with sedimentary rocks. Four stable sedimentary layers and two parallel uncontbrmity surfaces were discovered the 1/50 000 geological survey. The zircon LA-ICP-MS U-Pb ages of the volcanic rocks in the study area are 128- 155 Ma. The composition, stratigraphic sequence, formation age and tectonic environment of the Mesozoic basin were redeterminated. The upper Jurassic system （143- 155 Ma） partition for the Manketouebo Formation and Manitu Formation; while the Lower Cretaceous （128- 141 Ma） division for the Zhangjiakou Formation, Dabeigou Formation and Yixian Formation.

关 键 词：地层序列 划分方案 河北省 内蒙古 山湾子 

分 类 号：P539.2[天文地球—古生物学与地层学]