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
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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±0.69 Ma,) 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.
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±0.69 Ma,) 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.
引文
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[32]Zhao X,Cheng Z,Xu X.The earliest ceratopsian from the Tuchengzi Formation of Liaoning,China[J].Vert Paleont,1999,19:681-691.
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[35]崔广振.北京发现硅化木群[J].植物杂志,1984,(4):14.
[36]段淑英.北京硅化木林[J].植物学报,1986,(3):331-335.
[37]Zhang W,Desai C S,Yong Y K.An Improved Axisymmetric Wilson Nonconforming Finite Element Method For Stress Analysis[J].Journal of Zhejiang University-Science A,2000,1(3):284-290.
[38]张武,郑少林,丁秋红.苏格兰木(Scotoxylon)在中国的首次发现[J].植物学报.2000,17(S):202-205.
[39]张元福,魏小杰,徐杰,等.北京延庆硅化木公园地质剖面陆相层序地层特征分析[J].地学前缘,2012,19(1):68-77.
[40]郑少林,张武,丁秋红.辽西中上侏罗统土城子组植物化石的新发现[J].古生物学报,2001,40(1):67-85.
[41]徐欢,柳永清,刘燕学,等.阴山—燕山地区晚侏罗世-早白垩世土城子组地层、沉积特征及盆地构造属性分析[J].地学前缘,2011,18(4):88-105.
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[43]蒲荣干,吴洪章.辽西中晚侏罗世孢粉组合[M].沈阳:辽宁科学技术出版社,1982:179-184.
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