| 重庆綦江地质公园地质遗迹特征及其地质意义 |
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| 引用本文： | 刘严松,何政伟,龙晓君,李晓琴,李能炯,龚黎明.重庆綦江地质公园地质遗迹特征及其地质意义[J].中国地质灾害与防治学报,2010,21(2):118-124. |
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| 作者姓名： | 刘严松 何政伟 龙晓君 李晓琴 李能炯 龚黎明 |
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| 作者单位： | 1. 成都理工大学地球科学学院,四川,成都,610059
2. 重庆市地质勘查与矿产开发局川东南地质队,重庆,400038 |
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| 摘 要： | 綦江地质公园发育木化石、恐龙足迹、恐龙骨骼化石、鱼化石、沉积构造、丹霞地貌等地质遗迹景观,木化石和恐龙足迹为园区的导向型景观。木化石分布在侏罗系中统沙溪庙组(J2s)上部砂岩层中,砂岩层含钙质结核,在约300×200m2的砂岩层内共埋藏有60多根木化石,其中一半木化石为钙化作用形成。恐龙足迹集中分布在白垩系上统夹关组(K2j)砂泥岩层中,岩层发育交错层理、波痕和泥裂。在夹关组的3个层位中共发现329个恐龙足迹,其分别属于甲龙类、鸟脚类和兽脚类。园区地质遗迹分布在一套河湖相沉积层中,其形成于内陆河湖网形成之时(如木化石),并随着四川盆地周围的湖泊系统解体而发展(如恐龙足迹),最终随着河流由堆积作用为主的阶段转变为以侵蚀作用为主的阶段而减弱(如丹霞地貌)。白垩纪上统夹关组的恐龙足迹群形成于干热的环境,多类型的恐龙足迹集中分布反映了白垩纪晚期(夹关期)恐龙种群的丰富,恐龙足迹的发现为区域内寻找白垩系地层的恐龙骨骼化石提供了依据。
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| 关 键 词： | 地质遗迹 恐龙足迹 木化石 古环境 重庆綦江 |
Characteristics and geological significance of geological relics in Qijiang geopark,Chongqing City |
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| LIU Yan-song,HE Zheng-wei,LONG Xiao-jun,LI Xiao-qin,LI Neng-jiong,GONG Li-ming.Characteristics and geological significance of geological relics in Qijiang geopark,Chongqing City[J].The Chinese Journal of Geological Hazard and Control,2010,21(2):118-124. |
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| Authors: | LIU Yan-song HE Zheng-wei LONG Xiao-jun LI Xiao-qin LI Neng-jiong GONG Li-ming |
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| Institution: | 1.College of Earth Science,Chengdu University of Technology,Chengdu 610059,China;2.Geological Team ofSoutheastern Sichuan,Chongqing Bureau of Geological Exploration and Exploitation of Mineral Resources,Chongqing 400038,China) |
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| Abstract: | There are fossil wood,dinosaur tracks,dinosaur bone fossils,ichthyolite,sedimentary structures,Danxia landform and other geological relics in Qijiang geopark,and the fossil wood and dinosaur tracks are the guide landscape.Fossil wood distributes in the upper part of middle Jurassic Shaximiao Formation sandstone beds（J 2 s）,which contain calcareous concretion and have more than sixty fossil wood in the 300×200m 2 sandstone,the half of the fossil wood were calcified.Dinosaur tracks main distribute in the upper Cretaceous Jiaguan Formation sand-shale beds（K 2 j）,which have cross-stratification,ripple mark and mud crack.There found 329 dinosaur tracks in the three beds of Jiaguan Formation,and the dinosaur tracks belong to Ankylosauria,Ceratopsia and Theropoda respectively.The geological relics of Qijiang geopark distribute in the fluviatile-lacustrine sediment,which started to form when the inland river and lake net generated（e.g.fossil wood）,and developed along with the disintegrate process of the lake system near the Sichuan basin（e.g.dinosaur tracks）.The evolution rate of geological relics slowed down when the erosion rate of river was greater than sedimentation rate（e.g.Danxia landform）.The dinosaur tracks in the upper Cretaceous Jiaguan Formation were formed in the heat and dry environment,a wide range of dinosaur tracks concentrated in one place,which infers that the dinosaur in late Cretaceous（Jiaguan stage）have a great diversity population,and the discovery of dinosaur tracks in geopark offers evidence that dinosaur bone fossils will be found in the area. |
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| Keywords: | geological relics dinosaur tracks fossil wood palaeoenvironment Qijiang Chongqing City |
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