Jurassic Tectonics of North China:A Synthetic View

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:panxihuanhe
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
This paper gives a synthetic view on the Jurassic tectonics of North China,with an attempt to propose a framework for the stepwise tectonic evolution history.Jurassic sedimentation,deformation and magmatism in North China have been divided into three stages.The earliest Jurassic is marked by a period of magmatism quiescence(in 205-190 Ma)and regional uplift,which are considered to be the continuation of the“Indosinian movement”characterized by continent-continent collision between the North and South China blocks.The Early to Middle Jurassic(in 190-170 Ma)was predominated by weak lithospheric extension expressed by mantle-derived plutonism and volcanism along the Yanshan belt and alongside the Tan-Lu fault zone,normal faulting and graben formation along the Yinshan- Yanshan tectonic belt,depression and resuming of coal-bearing sedimentation in vast regions of the North China block(NCB).The Middle to Late Jurassic stage started at 165±5 Ma and ended up before 136 Ma;it was dominated by intensive intraplate deformation resulting from multi-directional compressions.Two major deformation events have been identified.One is marked by stratigraphic unconformity beneath the thick Upper Jurassic molasic series in the foreland zones of the western Ordos thrust-fold belt and along the Yinshan-Yanshan belt;it was predated 160 Ma.The other one is indicated by stratigraphic unconformity at the base of the Lower Cretaceous and predated 135 Ma. During this last stage,two latitudinal tectonic belts,the Yinshan-Yanshan belt in the north and the Qinling-Dabie belt in the south,and the western margin of the Ordos basin were all activated by thrusting;the NCB itself was deformed by the NE to NNE-trending structural system involving thrusting,associated folding and sinistral strike-slip faulting,which were spatially partitioned.Foliated S-type granitic plutons aged 160-150 Ma were massively emplaced in the Jiao-Liao massif east of the Tan-Lu fault zone and indicate important crustal thickening in this part of the NCB.The Jurassic deformation patterns,different tectonic systems and multi-directional contractions in North China recorded far-field effects of synchronous convergences,toward the East Asian continent,of three different plates,the Siberian plate in the north,the paleo-Pacific oceanic plate in the east and the Lhasa block in the southwest.This Middle to Late Jurassic intraplate orogenesis and pervasive shortening deformation preceded lithospheric attenuation and thinning in East China,which most possibly started by the Early Cretaceous around 135 Ma. This paper gives a synthetic view on the Jurassic tectonics of North China, with an attempt to propose a framework for the stepwise tectonic evolution history. Jurassic sedimentation, deformation and magmatism in North China have been divided into three stages. Earliest Jurassic is marked by a period of magmatism quiescence (in 205-190 Ma) and regional uplift, which are considered to be the continuation of the “Indosinian movement” characterized by continent-continent collision between the North and South China blocks. The Early to Middle Jurassic (in 190-170 Ma) was predominated by weak lithospheric extension expressed by mantle-derived plutonism and volcanism along the Yanshan belt and along the Tan-Lu fault zone, normal faulting and graben formation along the Yinshan-Yanshan tectonic belt, depression and resuming of coal-bearing sedimentation in vast regions of the North China block (NCB). The Middle to Late Jurassic stage started at 165 ± 5 Ma and ended up before 136 Ma; it was dominated by intensive intraplate deformation caused from multi-directional compressions. Two major deformation events have been identified. One is marked by stratigraphic unconformity beneath the thick Upper Jurassic molasic series in the foreland zones of the western Ordos thrust-fold belt and along the Yinshan-Yanshan belt; it was predated 160 Ma. The other one is indicated by stratigraphic unconformity at the base of the Lower Cretaceous and predated 135 Ma. During this last stage, two latitudinal tectonic belts, the Yinshan-Yanshan belt in the north and the Qinling- Dabie belt in the south, and the western margin of the Ordos basin were all activated by thrusting; the NCB itself was deformed by the NE to NNE-trending structural system involving thrusting, associated folding and sinistral strike-slip faulting, which were spatially partitioned .Foliated S-type granitic plutons aged 160-150 Ma were massively emplaced in the Jiao-Liao massif east of the Tan-Lu fault zone and indicative important crustal t hickening in this part of the NCB. Jujussic deformation patterns, different tectonic systems and multi-directional contractions in North China recorded far-field effects of synchronous convergences, toward the East Asian continent, of three different plates, the Siberian plate in the north , the paleo-Pacific oceanic plate in the east and the Lhasa block in the southwest. This Middle to Late Jurassic intraplate orogenesis and pervasive shortening deformation preceded lithospheric attenuation and thinning in East China, which most possibly started by the Early Cretaceous around 135 Ma.
其他文献
展现一位为抗日摇旗呐喊的画家的一段风光经历;讲述一位拿起笔作刀枪,战斗在抗日前沿的勇士;他曾为毛泽东、朱德和周恩来夫妇画速写;茅盾评价说:他是用他的画笔来联系前方与
鸡西矿业集团公司张辰煤矿西三采区3
期刊
潘鹤和关山月是邻居。有一天,关山月和夫人李秋璜登上潘鹤新近加层扩建的新居。正好潘鹤为关山月创作的铜塑头像,刚从铸造厂取回来,还来不及送给关山月。潘鹤低声问关老:“
大多数女人,想必多多少少都有几个死党闺蜜,而大多数女人,最终都会有自己的婚姻和家庭。同时,朋友的类型也多种多样。有人冷静自制,总是与朋友保持一定的距离;有人热心诚恳,但并在交往中懂得轻重和分寸;有人太过八卦,总是那么起劲地爱管朋友的闲事,瞎出招,但出的都是烂招……最后一种女人,尤其让人烦不胜烦。  最可怕的是,这种女人的“关心”和她们出的烂招,很可能成功地让她们的朋友夫妻闹崩,婚姻解体。  那么,
与妻子一起生活的43年里,我们有过欢笑,也有过苦涩,有过举杯相庆,也有过泪眼相向。揉碎滤汁,沉淀下来的,就像是一杯品之不尽的陈年老酒,随着时间的推移,愈久愈醇。12年,不,准
实现蛋白质和多肽类药物的口服给药是药物递送长期追求的目标 ,具有很好的发展前景 ,同时也存在许多问题。渗透性、稳定性及在胃肠内的转运时间等是影响该类药物口服吸收的因
轻得无与伦比的气凝胶JochenFricke著胡季平译取10份金属氧化物与90份空气均匀混合──眼看着工业界狂喜地扑到这产品上。为什么泥塘干涸时会龟裂?美国化学家凯斯勒(SamtlelKistler)解不开这谜;但他能克服龟裂,从
回想起来,我在金蝶工作已近二十年,从普通财务人员到CFO,一直与税务部门打交道,感受颇深的是税务部门的税法宣传工作越来越好,金蝶参与这项工作也越来越多,全公司上下形成了
应用免疫荧光组织化学三标方法结合激光共聚焦显微镜技术研究了辣椒素受体(VR1)在大鼠舌咽神经和迷走神经内脏感觉神经节结状神经节(NG)和岩神经节(PG)内的表达,以及与降钙素
此文采用纠正的拉格朗日列式和基于弹塑性乘法分解的超弹性塑性本构关系,对铝带在不同轧制条件下的异步冷轧过程进行了大变形弹塑性有限元模拟.结果表明,在异步轧制时,轧制力