北京延庆千家店盆地土城子组古生物化石及古气候沉积环境——延庆地区首次发现疑似恐龙骨骼化石  

A discussion on Tuchenzi fossils and paleoclimate sedimentary environment in Qianjiadian basin of Yanqing County:Suspected dinosaur bones discovered for the first time in Yanqing,Beijing

作　　者：贺瑾瑞[1] 焦润成[1] 南赟[1] 郝春燕[1] 张玲玲[1] 冉淑红[1] 宋庆伟[1] 张翊超[1] 赵丹凝[1] 程素珍[1] HE Jinrui;JIAO Runcheng;NAN Yun;HAO Chunyan;ZHANG Lingling;RAN Shuhong;SONG Qingwei;ZHANG Yichao;ZHAO Danning;CHENG Suzhen(Beijing Institute of Geology, Beijing 100120, China)

机构地区：[1]北京市地质研究所,北京100120

出　　处：《地质通报》2017年第8期1319-1329,共11页Geological Bulletin of China

基　　金：中国地质调查局项目<华北地区重要地质遗迹调查(北京)>(编号:1212011220044);北京市国土局项目<北京市地质遗迹详查评价及保护对策研究>(编号:0747-1361SITCN217);北京市地质矿产勘查开发局项目<北京市延庆县千家店盆地土城子组孢粉组合特征研究>(编号:京地[2015]148号)

摘　　要：延庆千家店盆地土城子组底部不整合接触蓟县系雾迷山组,不见顶,主要分为3个岩性段,一段以复成分砾岩、砂砾岩为主;二段以紫红色、黑色薄层泥页岩和泥质粉砂岩为主;三段以复成分砾岩、含砾粗砂岩为主。前人在该盆地二段地层中发现大量动植物化石,有双壳类、叶肢介、昆虫、木化石、恐龙足迹等,但一直没有介形类、孢粉及恐龙化石的相关报道。在化石层位发现疑似"恐龙骨骼"化石,丰富了该区化石种类。通过LA-ICP-MS测年,得出一段底部年龄为157.62±0.69Ma;二段中上部年龄为157.13±0.96Ma。分析认为,千家店盆地土城子组主体沉积时代为晚侏罗世早期,在前人研究的基础上,通过多样的古生物化石来探讨该盆地古气候背景及沉积环境。The Tuchengzi Formation in Qianjiadian Basin of Yanqing County is composed of three lithologic members:the first member mainly consists of polymictic gravel and glutenite,the second member mainly consists of purplish red shale and argillaceous sandstone,and the third member mainly consists of compound gravel and gravel-bearing grit sandstone.A lot of fossils found in the second member have been reported,such as bivalves,conchostracans,Palaeontologists,plant fossils and dinosaur footprint.Nevertheless,no relevant reports on the fossils of ostracods,sporopollen and dinosaur bones are found.In this study,the suspected dinosaur bone fossils were discovered for the first time in the second member of the Tuchengzi Formation in Qianjiadian Basin of Yanqing County,and LA-ICP-MS zircon U-Pb dating of the argillaceous sandstone was carried out.According to the age values of the lower part of the first member(15.762±0.69Ma,)and the upper part of the second member(157.13±0.96Ma),the formation age of the Tuchengzi should be early Late Jurassic.On the basis of previous studies,the ancient climate and sedimentary environment of the Qianjiadian basin are discussed.

关 键 词：晚侏罗纪早期 恐龙骨骼 古气候背景 沉积环境 延庆千家店盆地 

分 类 号：Q915.2[天文地球—古生物学与地层学]