共查询到18条相似文献，搜索用时 328 毫秒
1.
2.
恐龙化石对研究地球演化、生物进化、地层对比、地质年代、古环境、古地理、古气候等方面具有重要的科学价值。但恐龙化石发掘后面临着严重的风化问题,许多化石发掘后十几年甚至几年内就迅速遭受风化破坏。为深入研究探索恐龙化石地质遗迹的深层次风化原因和机理,该文采用TM（温度和应力）耦合分析方法,对山东诸城恐龙化石风化规律进行深入分析研究。根据化石与围岩间膨胀的不协调性,探索在温度变化情况下化石与围岩间的相互作用规律及对风化造成的影响。结果揭示了温度作用下化石风化的初步原因和规律,可为化石保护提供参考科学依据。 相似文献
3.
由热应力引起的热破裂作用是造成恐龙化石破坏的一个重要因素。在太阳照射条件下,由于受热不均匀及日照的长久往复循环作用,使得化石表面发生热破裂作用,导致化石表面产生裂缝,加速了恐龙化石风化。采用模拟实验的方式,主要针对恐龙化石试件的物理力学受力变形特性进行研究。通过有限差分软件FLAC3D进行数值模拟,揭示日光辐射造成的恐龙化石温度差异分布对化石风化的影响。试验结果表明:恐龙化石不同部位的温度差异,是造成化石内部热应力分布不均匀的重要原因,热应力的不均匀性导致化石发生热破裂,加速了化石风化受损,因此化石保存要尽量放在恒温环境下,避免化石温度往复变化。 相似文献
4.
5.
面临众多古生物化石遭受风化破坏的现实,恐龙化石保护是一项世界性难题。化石的风化原因多种多样,其中化石内部裂隙是导致恐龙化石风化、破坏的重要因素。该文以岩石断裂力学为理论依据,模拟分析内含裂隙的恐龙化石在压力作用下的破坏情况。通过数值模拟的方法,进行了内含裂隙恐龙化石数值压缩试验,并对内含裂隙的恐龙化石裂纹扩展机理进行了研究。研究结果表明,随着裂隙角度增大,开裂角逐渐减小,裂隙处特别是两端应力集中,其他部位应力较低、分布均匀;裂纹扩展是从裂纹尖端起裂,最终裂纹扩展到边缘。此研究结果为揭示恐龙化石风化机理和开展保护提供了基础参考资料。 相似文献
6.
吴芷芊 《国土资源科普与文化》2016,(1):47-47
正时间追溯到2.3亿年前,那时,统治地球的是一个庞大的恐龙家族,它们是地球上的生灵,在这个星球上生活了两亿年之久。但"物竞天择,适者生存",这个庞大的家族终究还是难逃天灾,它们在6 500多万年前绝迹了!而它们灭绝的原因也变成了科学史上的不解之谜。今天,我来到了诸城恐龙博物馆,参观了博物馆、恐龙河、恐龙山,不仅看到了许多从来不曾见过的恐龙骨架,而且见到了满山遍野的恐龙尸骨碎块,凄惨而壮观。 相似文献
7.
8.
9.
7月31日,中国地质博物馆嘉荫恐龙馆正式揭牌。
嘉荫神州恐龙博物馆位于东北边陲,坐落在距嘉荫县城12千米处的恐龙山——嘉荫恐龙国家地质公园内,是2002年经黑龙江省国土资源厅批准建设的,占地4650平方米。恐龙山临江而立,长约11千米,是我国境内发现最早并经科学记载的恐龙化石发掘地。截至目前,从这里出土的恐龙化石已经组装成13具化石骨架。 相似文献
10.
《国土资源》2016,(12):30-31
正一个浑身长毛、世界上最小的恐龙(非鸟恐龙)被中国、加拿大等国科学家发现。这是有史以来,人类第一次在琥珀中发现恐龙。12月9日凌晨,在线发表在国际学术期刊《当代生物学》(Current Biology,《细胞》出版集团旗下的科学杂志)的论文《白垩纪中期琥珀中一个长着原始羽毛的恐龙尾》(A Feathered Dinosaur Tail with Primitive Plumage Trapped in MidCretaceous Amber)显示,人类在琥珀中发现的第一件恐龙标本是一条长约3.85厘米、长满毛的尾巴。根据同类恐龙的体型,研究人员推断,这一 相似文献
11.
12.
13.
Survey and establishment of Nanshimenzi Bed of Tiaojishan Formation in Qinglong,northern Hebei,China
In recent years,many fossil vertebrates,including feathered dinosaurs,have been discovered at Nanshimenzi village,Gangou Town,Qinglong County,Hebei Province,China.A geological section including the fossil-bearing strata was measured at Nanshimenzi,to determine the exact geological age and sedimentary characteristics of the section,and a new lithostratigraphic unit was named as the Nanshimenzi Bed.The Nanshimenzi Bed is about 56.6 m in thickness,mainly consisting of gray sandstones and siltstones and containing fossil vertebrates and several coal streaks.On the basis of survey and comparison,the Nanshimenzi Bed should be assigned to Tiaojishan Formation and probably to the upper part of the formation. 相似文献
14.
《世界地质(英文版)》2016,(4):230-240
Recent geological and paleontological exploration in the Indus basin of Pakistan allowed the discover-ies of numerous remains of non-marine reptiles (titanosaurian sauropod,abelisaurian and noasaurian theropod dinosaurs),and marine reptiles (crocodiles),flying reptiles (pterosaurs),marine and non-marine mammals, fishes,invertebrates,and plants,especially Pakistan is relatively rich in footprints/trackways in the Mesozoic. These vertebrates of Indo-Pakistan are very significant for paleobiogeographic study due to the present-day con-nection of this continent with Asia in Northern Hemisphere,whereas during past (Jurassic and pre-Jurassic)it was connected to the Gondwana.The Mesozoic vertebrates show close affinities with Gondwanan landmasses. The Cenozoic vertebrates show Eurasian affinity and migrated from Indo-Pak subcontinent to Eurasia or vice ver-sa via Paleo Indus River systems along Western Indus Suture,after long journey of about 6 000 km the first col-lision of Indo-Pak subcontinent with Asia occurred at terminal Cretaceous. 相似文献
15.
Sun G M.Akhmetiev Dong Z.M A.R.Ashraf Sun Y.W E.Bugdaeva D.L.Dilcher L.Golovneva I.Harding K.Johnson T.Kezina T.Kodrul LU J.S V.Markevich H.Nishida H.Okada Park S.O Sun C.L Xiong X.Z Xing Y.L Zhou Z.L 《世界地质(英文版)》2002,5(2)
Abstract A new geological section recognized in Baishantou of Jiayin, Heilongjiang Province, China, was studied preliminarily in searching for the K/T boundary. An early Paleocene florule characrerized by abundant Tiliaephyllum tsagajanicum leaves and its associated plants, was collected from the Baishantou Member (new member representing the lower part of the Paleocene Wuyun Formation) overlying the possible K/T boundary. A tuff bed was found from the upper part of the Furao Formation (uppermost Cretaceous) in this section. The new findings imply that the K/T boundary is probable lying in the interval between the base of the Baishantou Member and the tuff bed, based on the correlation of the present strata with the stratotype of the Tsagajan Group spanning the K/T boundary in "Belaya Gara" of the Bureya Basin, Russia. The early Paleocene florule from the Baishantou Member and the early-middle Maastrichtian dinosaurs found from the Yuliangzi Formation underlying the Furao Formation suggest that the Baishantou section is more promising for searching for the K/T boundary in this area. Further studies of the section is needed, integrating paleontological, biostratigraphic, geochemical, paleomagnetic, and sedimentary research would benefit our understanding the mass extinction event and biotic recovery in the Heilongjiang River area, China, and even all of northeast Asia during the K/T boundary interval. 相似文献
16.
《世界地质(英文版)》2016,(4):187-204
The Berezovsk coal mine in western Siberia has yielded the most diverse Middle Jurassic limnic and terrestrial vertebrate assemblage of Asia.The vertebrate remains were recovered by screen washing from flood-plain deposits on top of a thick coal seam of the Bathonian Itat Formation.A total of 29 vertebrate taxa has been recorded so far,including hybodontiform sharks,acipenseriforms,palaeonisciforms,amiiforms,dipnoans,anu-rans,caudates,turtles,squamates,choristoderans,crocodyliforms,pterosaurs,dinosaurs,tritylodontids,and a diverse mammaliaform and mammalian assemblage (eleutherodontids,docodontans,?amphilestids,dryo-lestids,and zatherians).The caudates are among the oldest in the fossil record and the anurans represent the oldest Asian record of this group.Among the mammals,Anthracolestes is the oldest and most basal known mem-ber of Dryolestidae and so far the only record from Asia.The vertebrate assemblage from the Berezovsk coal mine is very similar to that from the British Forest Marble Formation (Bathonian)and suggests a limited provin-cialism in the Middle Jurassic Laurasian landmass. 相似文献
17.
文章通过对西虎岭黄铁矿床围岩蚀变的研究认为，围岩蚀变大致可分为６种基本蚀变类型，５个蚀变阶段，３个蚀变带。各蚀变带以矿体为中心对称分布，各带之间呈渐变过渡关系。同时认为矿床成因类型属中低温热液充填型，并指出围岩蚀变的找矿意义。 相似文献
18.