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随着一系列新构造观察资料和高精度同位素测年数据的累积,加深了对发生在中国东部晚侏罗世—早白垩世时期构造变革事件的认识,对燕山运动的性质、时限和动力学内涵有了新的诠释。中—晚侏罗世初期(165±5Ma)东亚多板块拼贴运动学发生重大调整,构造体制发生重大转换,启动了以中朝地块为中心、来自北、东、南西不同板块向东亚大陆"多向汇聚"的构造新体制,形成以陆内俯冲和陆内造山为特征的东亚汇聚构造体系。同时大陆地壳岩石圈发生显著增厚,并紧随早白垩世以剧烈的大陆岩石圈伸展和火山—岩浆活动为特征的岩石圈巨量减薄和克拉通破坏,导致燕辽生物群灭绝和热河生物群兴盛的重大生物群更替,成为中国大陆和东亚重大构造变革事件,这是燕山运动的基本内涵。本文依据燕山运动构造变形型式、动力学背景以及产生的深部过程,将"燕山运动"定义为起始于165±5Ma的"东亚多向汇聚"构造体制及其形成的广泛陆内造山和构造变革,并将中国东部岩石圈巨量减薄视作燕山期陆内造山和陆内变形的后效。 相似文献
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Jurassic Tectonic Revolution in China and New Interpretation of the “Yanshan Movement” 总被引：42，自引：0，他引：42
DONG Shuwen ZHANG Yueqiao LONG Changxing YANG Zhenyu JI Qiang WANG Tao HU Jianming CHEN Xuanhua 《《地质学报》英文版》2008,82(2):334-347
With acquisition and accumulation of new data of structural geological investigations and high-resolution isotopic dating data, we have greatly improved our understanding of the tectonic events occurring in eastern China during the period from the Late Jurassic to Early Cretaceous and may give a new interpretation of the nature, timing and geodynamic settings of the “Yanshan Movement”. During the Mid-Late Jurassic （165±5 Ma）, great readjustment of plate amalgamation kinematics took place in East Asia and the tectonic regime underwent great transformation, thus initiating a new tectonic regime in which the North China Block was the center and different plates converged toward it from the north, east and southwest and forming the “East Asia convergent” tectonic system characterized by intracontinental subduction and orogeny. As a consequence, the crustal lithosphere of the East Asian continent thickened considerably during the Late Jurassic, followed immediately by Early Cretaceous substantial lithospheric thinning and craton destruction featured by drastic lithospheric extension and widespread volcano-magmatic activities, resulting in a major biotic turnover from the Yanliao biota to Jehol Biota. Such a tremendous tectonic event that took place in the continent of China and East Asia is the basic connotation of the “Yanshan Movement”. In the paper, according to the deformation patterns, geodynamic settings and deep processes, the “Yanshan Movement” is redefined as the Late Jurassic East Asian multi-directional plate convergent tectonic regime and its associated extensive intracontinental orogeny and great tectonic change that started at -165±5 Ma. The substantial lithospheric attenuation in East China is considered the post-effect of the Yanshanian intracontinental orogeny and deformation. 相似文献
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本文实事求是地介绍了道虎沟生物群的组成及相关地层的岩性,并根据长尾型嘴口龙类(Rhamphorhynchoidea)翼龙与短尾型翼手龙类(Pterodactyloidea)翼龙同期共生的特点,确信道虎沟生物群的地质时代为晚侏罗世。此外,本文还研究了道虎沟生物群中翼龙身上发育的皮肤衍生物,初步认为它们是原始羽毛(protofeathers),至少是与羽毛同源的(feather-homologous),这对于了解羽毛(广义)的演化历史和早期的形态结构将具有十分重要的意义。 相似文献
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再论道虎沟生物群的时代 总被引：14，自引：1，他引：13
内蒙古宁城道虎沟地区的晚中生代地层十分发育，产状平缓，主要为一套产有丰富动、植物化石的凝灰质泥岩和粉砂岩，并夹有数层火山岩。从区域上来看，在西台子一带主要为早白垩世义县组的地层，产有丰富的热河生物群的化石，常见者有鱼类Lycoptera davidi，Peipiaosteus pani，Yanosteus longidorsalis，Protopsephurus liui和鸟类Confuciusornis anctus；但在道虎沟—小西沟一带主要为中—晚侏罗世髫髻山组的地层，产有丰富的道虎沟生物群的化石，常见者有蝾螈Jeholotriton paradoxus和Chunerpeton tianyiensis，翼龙Jeholopterus ningchengensis和Pterorhynchus wellnhoferi，手盗龙类Scansorio pteryxheilmanni和（？）Pedopenna daohugouensis[本文对Xu等（2005）描述的道虎沟足羽龙（Pedopennad aohugouensis）的原始产地存有疑义]，昆虫Mesobaetis sibirica，Mesoneta antiqua，Rhipidoblattina（Canaliblatta）hebeiensis，Brunneus haifanggouensis，Palaeontinodes haifanggouensis等，叶肢介Euestheria zilu jingensis，E．haifanggouensis，E．jingyuanensis和E．1uanpingensis，植物Cladophleln＇s（Osmunda？）sp．，Anomozamites angulatus，A．（Trymia？）sp．，Cycadolepissp．，Gmkgotes sp．，Pityospermus sp．，Pityocladus sp．，Zamitesgigas，Yanliaoiasmensis和Coniopteris burejem括等。根据区域地质构造、地层分布、生物群特征和地质年代学资料分析，笔者确信道虎沟生物群的时代为中—晚侏罗世（卡洛夫阶—牛津阶），根本不可能将其归于早白垩世热河生物群。 相似文献
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辽西凌源全身长有羽毛奔龙化石的再研究 总被引：8，自引：0，他引：8
对辽西凌源发现的全身长有羽毛的奔龙化石 (NGMC91) (Ji等 ,2 0 0 1)进行了再研究。根据头颅和头后骨骼的特征 ,其应归于中国鸟龙属 (SinornithosaurusXuetal.,1999)。由于研究的材料是一块处于非成年期的标本 ,虽然其有些特征明显与千禧中国鸟龙有别 ,但仍难以确定这些差异是否受个体发育的影响。因此 ,文中仍将其作为未定种 ,置于中国鸟龙属中。此外 ,文章还简要讨论了羽毛的发生和早期演化 ,认为羽毛出现的初始功能就是为了保持体温 ,与后期的飞行功能无关 相似文献