【作者】 宋明春；

【导师】 李锦轶；

【作者基本信息】 中国地质科学院 ， 构造地质， 2008， 博士

【摘要】 山东省位于中国大陆的东部,地质构造复杂,其大地构造演化过程可划分为早前寒武纪阶段、中新元古代阶段、古生代阶段和中新生代阶段等4个阶段。山东省早前寒武纪基底由胶辽微陆块(鲁东地块)、渤鲁微陆块(鲁西地块)和迁怀微陆块(德州地块)组成。山东于2.8Ga以前形成具岛弧性质的沂水和唐家庄古陆核。2.8～2.7Ga,鲁西地区拉张出现初始洋壳,形成具大洋高原环境特点科马提岩、枕状玄武岩组合。2.7～2.56Ga,洋盆消减,俯冲作用造成早期TTG质花岗岩侵位,形成鲁西和鲁东岛弧,为初始不成熟陆壳。2.56～2.4Ga,弧陆碰撞,大量碰撞型花岗岩侵位,第二期TTG质花岗岩系和二长花岗岩系大规模出现,地壳由不成熟陆壳向半成熟陆壳转化;至古元古代岩浆活动完全由代表成熟陆壳的重熔型二长花岗岩构成。2.4～2.1Ga,四海山A型花岗岩的出现标志着刚性陆壳发生拉张减薄,山东陆块基底大规模克拉通化完成:同时,鲁东地区强烈裂陷,形成裂陷盆地。2.1～1.9Ga,鲁东裂陷盆地闭合,古元古代地层发生强烈褶皱。中新元古代山东陆块归属华北克拉通和大别-苏鲁造山带。中元古代初期(1.84～1.72Ga),地壳发生裂解,济宁裂谷型沉积和鲁西第一期基性岩墙群形成。中元古代晚期(1.20～1.05Ga),地壳再次裂解,海阳所幔源岩浆杂岩和鲁西第二期基性岩墙群形成。新元古代早中期(0.9～0.73Ga),出现同碰撞的S型和I型花岗岩,伴随有强烈的挤压变形作用,形成雄伟的苏鲁碰撞造山带,在造山带北西侧产生具前陆盆地性质的沂沭盆地。新元古代晚期,岚山头A型花岗岩和具后继盆地性质的蓬莱盆地及具上叠盆地性质的石桥盆地的出现,指示强烈造山作用结束,地壳演化开始了另一个新的阶段。古生代构造单元划分为华北板块陆表海盆地、鲁东被动大陆边缘和大别-苏鲁裂谷盆地。早古生代特征是全域同步缓慢沉降,鲁西以台地相及潮坪、泻湖相碳酸盐岩沉积为主。中、晚奥陶世之后,受板块汇聚俯冲影响,鲁西地区整体抬升剥蚀,缺失晚奥陶世—泥盆纪沉积。晚古生代特征是结束了的单一海相沉积史,完成了海陆交互相向纯陆相沉积的重大古地理转变,晚石炭世至早二叠世沉积了一套准碳酸盐台地和三角洲—潮坪泻湖相的暗色砂泥岩、灰岩和煤层;从中二叠世开始,出现典型的河湖相沉积建造。鲁东被动大陆边缘和大别-苏鲁裂谷盆地的古生代沉积被后期剥蚀殆尽。中新生代属滨太平洋前陆坳陷带和滨太平洋构造岩浆活动带,包括渤海湾盆地、鲁中隆起、蒙阴盆地群、济宁坳陷、沂沭裂谷、胶北隆起、胶莱盆地、鲁东折返带(超高压带)和苏北折返带(高压带)等次级构造单元。早中三叠世板块作用产生苏鲁碰撞造山带;晚三叠世,形成高钾钙碱性花岗岩类侵入岩,来源于富集岩石圈地幔源区的碱质花岗岩浆的侵位,则标志着后造山拉张作用的开始。侏罗纪时,鲁东地区形成了类似于埃达克岩的高锶花岗岩;鲁西地区局部发生沉降,产生盆地,同时形成了一套与大陆的造陆抬升有关的高镁中基性侵入岩;早侏罗世末,沂沭断裂开始产生并发生左行平移运动。白垩纪构造岩浆活动非常活跃,形成大规模具有弧后拉张性质活动大陆边缘特点的火成岩组合,崂山A型花岗岩的出现标志着强烈岩浆活动趋于尾声;由侏罗纪—白垩纪晚期地幔具有由EMⅠ富集地幔向EMⅡ富集地幔演变和由富集向亏损或由岩石圈向软流圈演变的趋势:受太平洋板块俯冲影响,郯庐断裂发生大幅度左行平移,沂沭断裂二侧伴生形成羽状断裂系统、棋盘格状断裂系统和多层次拆离滑脱构造系统;同时,产生大量断陷盆地,构成隆起与凹陷相间分布的盆山耦合格局。新生代构造格局具有明显的继承性和新生性双重特点,主要地质事件是受断裂控制的新生代盆地和玄武岩喷发。更多还原

【Abstract】 The position of Shandong province locate in east of China continente.Its geological structure is complicated.Its tectonic evolution can be divided into the early Precambrian stage,Meso- to Neoproterozoic stage,Paleozoic stage and Meso- to Cenozoic stage.There are three Early Pre-Cambrian micro-continental blocks consisting the basement of Shandong Province.they are Jiaoliao(Ludong),Bolu(Luxi),and Qianhuai(Dezhou).All of them have a complicated evolution history.In ca.2.8 Ga,Yishui Paleo-continental core of the Qianhuai and Tangjiazhuang Paleo-continental core of the Bolu formed,likely resulting from island-arc-like activation.During ca.2.8～2.7Ga,infantile oceanic crust appeared in Luxi area due to lithosphere extension,evidenced by occurrence of komatiite and pillow basalt.During ca.2.7～2.56Ga,the infantile ocean crust subducted under the continental core,giving rise to the Ludong and Luxi continental arcs respectively,which are indicated by the intrusion of the earlier stage TTG granite.By this process,the Luxi and Ludong infantile ensialic continental crust formed.The subsequent arc-continent collision at ca.2.56～2.4Ga has led to a large amount of collision-type plutons including later stage TTG granite and monzonitic granites.At this time, the Shandong crust evolved into semi-mature ones.The Paleoproterozoic anatectic magmatic activity completely matured the Shandong continental crust.During ca.2.4～2.1Ga,the matured Shandong continental crust experienced strongly extension,resulting in Sihaishan A-type grannite in the Luxi area and rift-related magma activity and sediments in the Ludong area.At ca.2.1～1.9Ga,the Ludong rift closed suggesting the completion of the cratonization in Shandong Province.Above mentioned cratonization resulted in two different cratons with different evolutional history: the Luxi belongs to the North China Craton and Ludong to the Dabie-Sulu orogenic belt at Mesoproterozoic and Neoproterozoic era.At Early Mesoproterozoic(1.84～1.72 Ma),crustal extension of the Luxi craton resulted in the Jining rift-type sedimentation and the first stage marie dike Swarm.Another crust extension occurred at Late Mesoproterozoic(1.2～1.05 Ma),the Haiyangsuo mantle-sourced magmatic rocks developed in the Ludong area,and the second stage mafic dyke swarm occurred in the Luxi area.During the early and middle period of Neoproterozoic(0.9～0.73 Ma),syncollision S-type and I-type granites and widespread compressional structures suggest a strong collision occurring in the Ludong area,resulting in the great Sulu collision orogenic belt.The Yishui basin as the foreland one,developed in the northwest of the Sulu orogenic belt.The collision might end at Late Neoproterozoic,being suggested by the emergence of Lanshantou A-type granite,and Penglai and Shiqiao basins which were superposed upon the orogenic belt.During the Paleozoic period,the Shandong Province might consisted of three tectonic units:the North China shallow marine basin(west Shandong),a passive continental margin basin(east Shandong) and the Dabie-Sulu rift basin(southeast Shandong).Whole-area scale outcropping of the early Paleozoic strata suggests a whole-area-scale subsidence synchronously in the Luxi area at the early Paleozoic.The most significant sedimentary facies includes platform,tidal flat,and lagoon facies,implying the earlier Paleozoic subsidence was quite slow.The absence of the Upper Ordovician to Devonian strata in the Luxi area suggests regional scale uplift during this period.Since the Late Carboniferous,a new continental basin developed overlapping the earlier Paleozoic strata,where deposited meta-platform,deltaic,tidal flat,and lagoon facies limestone,dark arenited mudstone,and coal bed.The development of the Late Paleozoic basin indicates a complete transformation of the paleogeography from the marine to terrestrial ones.The Palaeozoic sediments in the Ludong area were completely eroded during the Mesozoic uplifting;sparse information comes from provenance analyses on the strata of the Mesozoic basin. In the Mesozoic and Cenozoic period,Shandong Province totally belongs to the circum-Pacific foreland depression belt and the circum-Pacific magmatic province,which is consisted of sub-units as bellow:Bohaiwan basin,Luzhong Rise,Mengyin basin groups,Jining depression,Yishu rift,Jiaobei Rise, Jiaolai basin,Ludong exhumed UHP(ultrahigh pressure metamorphic) belt,and Subei exhumed HP belt (high pressure metamorphic belt).The Early Triassic collision between the south China and North China plates given raise the Sulu collision orogenic belt.During the Late Triassic,high potassium calc-alkaline granites intruded into the orogenic belt,which sourced from enriched lithosphere mantle,and indicated the beginning of post-orogen extensional collapse.In the Jurassic,Adakite-like high Sr granite developed in the Ludong area.Meanwhile,a series of extensional basins developed in the Luxi area,indicating locally crustal subsidence alternative with adjacent rising.The rising was accompanied by a suit of high Mg basic to andesitic intrusions.In the last stage of the Late Jurassic,the Yishu fault system began to sliding in sinistral manner.Intensive Cretaceous magmatic activity suggests the beginning of another thermo-tectonic event in the Shandong Province.The widespread Cretaceous igneous rock have the same geochemical features as those formed under back-arc spreading setting.The spreading-related magmatic activation ended in the appearing of the Laoshan A-type granite.From the Triassic to Cretaceous,the mantle of the Shandong province changed from the EMⅠ- to EMⅡ- type although it remained enriched.Also due to the westward subduction of the Pacific Ocean plate,significant sinistral movement occurred along the Tanlu fault system.Besides the sinistral displacement,large amount of plume-like,chess-board-like fault systems,and multi-level detachment developed within the two displaced fault-wall blocks.Meanwhile, several sag basins formed due to the detachments,resulting in ridge-basin structures.During the Cenozoic, the major tectonic grains of Shandong Province are basins that were controlled by boundary faults.Part of the boundary faults are re-active ones,while the other are newly formed.The formation of the Cenozoic basins is accompanied by basaltic volcano eruption.更多还原