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41.
渤海湾盆地区燕山期构造特征与原型盆地 总被引:11,自引:7,他引:11
结合近几年来渤海湾盆地区深层地震勘探与解释的成果,重点论述了渤海湾盆地区燕山期构造特征与盆地原型,提出燕山期构造变形样式总体在纵向上可分为三个构造层,分别称为上部、中部和下部;横向上总体可分为三个构造带,西部为向西逆冲的薄皮逆冲带,中部为冲断—走滑带,东部为厚皮褶皱—冲断带,主体由两期挤压方向皆为NW—SE向的褶皱—逆冲变形形成;并将其演化分为三个阶段:燕山早期、燕山中期和燕山晚期。但是,渤海湾盆地区燕山期的构造变形特征和原型盆地有所变化,其空间上的差异是基底构造格局及其空间差异叠合的结果。综合其它研究结果还表明,渤海湾盆地区燕山期构造是在西太平洋大陆边缘弧的挤压构造背景下,陆内壳下拆沉和壳内挤出逃逸构造的综合动力作用下形成的。 相似文献
42.
中国东部中新生代盆地成因及其地球动力学 总被引:9,自引:1,他引:9
中国东部大兴安岭-太行山-武陵山重力梯度带一线以东至太平洋西岩,大陆连缘中新生代盆地系的形成,中生代岩浆活动,盆地基本特征同Moho、岩石圈和软流圈及上地幔基本特征的内在联系等都表明,它们在时空和成因上有一定联系,可以纳入同一地球动力学过程之中,这种动力学机制可能与岩石圈界,地壳底界的拆离作用有关。 相似文献
43.
Ren Jianye Li SitianFaculty of Earth Resources China University of Geosciences Wuhan Lin ChangsongDepartment of Energy Resources China University of Geosciences Beijing 《中国地质大学学报(英文版)》1997,(1)
LateMesozoicIntracontinentalRiftingandBasinFormationinEasternChina*RenJianyeLiSitianFacultyofEarthResources,ChinaUniversityof... 相似文献
44.
Lithospheric Stretching,Subsidence and Thermal History Modeling: Application to Yinggehai,Qiongdongnan and Songliao Basins in East China 总被引:3,自引:0,他引:3
Lin ChangsongDepartment of Energy Resources China University of Geosciences Beijing Li SitianFaculty of Earth Resources China University of Geosciences Wuhan Zhang QiminWest Nanhai Oil Company Zhanjiang Zhang 《中国地质大学学报(英文版)》1997,(1)
LithosphericStretching,SubsidenceandThermalHistoryModeling:ApplicationtoYinggehai,QiongdongnanandSongliaoBasinsinEastChina*Li... 相似文献
45.
山东中生代橄榄安粗岩系火山岩的地质、地球化学特征及岩石成因 总被引:44,自引:0,他引:44
山东中生代橄榄安粗岩系火山岩主要分布在沂沭断裂带及其两侧的断陷型陆相火山盆地中,为早白垩世火山活动的产物.Rb-Sr全岩等时年龄变化于111.4~119.6Ma.岩石组合主要为粗面玄武岩-橄榄安粗岩-安粗岩-粗面岩.这套岩石在化学上具有富碱富钾、富铝贫钛、高氧化系数及富轻稀土和大离子亲石元素的特点,并具有较高的ISr值和明显偏低εNd值.根据对岩石地质、地球化学特征和产出构造环境的详细分析,表明这套岩石的成因应主要是富集型地幔的部分熔融 相似文献
46.
宁芜地区中生代岩浆岩的成因——岩石学与Nd,Sr,Pb同位素证据 总被引:11,自引:0,他引:11
宁芜中生代火山盆地产出火山岩与侵入岩,火山岩以玄武粗安岩,粗安岩和粗面岩为主,安山岩和响岩少量,火山岩以高钾富碱为特征,已确定为橄榄安粗岩系。侵入岩以辉长闪长玢岩-一辉长闪长岩为主,以高钠低硅为特征,并有辉长岩和花岗岩产生,据地质学和Nd,Sr,Pb同位素资料,侵入岩与火山岩属同一个岩浆系列,是碱性玄武岩浆在下地壳经过轻度AFC混合后,侵入上地壳,在轻度混染的情况下,经过以结晶分离为主的岩浆分异形 相似文献
47.
The major gold deposits in east China are characterized by their occurrence in pre-Cambrian host metamorphic rocks,restriction in some specific stratigraphic-structural terranes,tendentious localization in ductile or ductile-brittle shear zones,association with the syntexis type granitoids,and significant remobilization,superimposition and enrichment by the later stage Mesozoic tectono-magmatic activities. 相似文献
48.
The authors have proposed a dynamic model in this paper based on the ages,rock series and associations,Sr-Nd isotopic signatures of the Mesozoic intracontinental magmatism overlying the Cathaysian and Yangtze blocks.The model describes the relation of intracontinental collision and subduction in the Tethyan tectonic regie with Paleo-Pacific oceanic plate sudbuction-strike slip-extension in the Pacific tectonic regime.During 220-150Ma,the horizontal collision between the North China block and the Yangtze block,as well as the intracontinental subduction of some divergent microcontinental terranes in the southwestern part of South China are ascribed to the influence of the Tethyan tectonic regime,giving rise to a volume of high-Isr and low-εNd(t) S-type granites only in the Cathaysian Block.During 145-90Ma,under the geodynamic backgound of subduction-strike slip-extension of the Paleo-Pacific oceanic plate on the basis of the deep tectonic process in the Tethyan tectonic regime,high-K,alkalirich calc-alkaline and shoshonitic volcano-plutonic complexes were generated in the Yangtze block,and high-K calc-alkalic and bimodal volcano-plutonic complexes were generated in the Cathaysian block.The occurrence of A-type peralkaline granites in the coastal areas of South east China indicates the end of Mesozoic intracontinental magmatism. 相似文献
49.
Basin-fill sequences of Mesozoic typical basins in the Yanshan area, North China may be divided into four phases, reflecting lithosphere tectonic evolution from flexure (T3), flexure with weak rifting (J1+2), tectonic transition (J3), and rifting (K). Except the first phase, the other three phases all start with lava and volcaniclastic rocks, and end with thick coarse clastic rocks and/or conglomerates, showing cyclic basin development rather than simple cyclic rift mechanism and disciplinary basin-stress change from extension to compression in each phase. Prototype basin analysis, based on basin-fill sequences, paleocurrent distribution and depositional systems, shows that single basin-strike and structural-line direction controlling basin development had evidently changed from east-west to northeast in Late Jurassic in the Yanshan area, although basin group still occurred in east-west zonal distribution. Till Early Cretaceous, main structural-line strike controlling basins just turned to northeast by north in the studied area. 相似文献
50.
The Mesozoic basins in Yanshan, China underwent several important tectonic transformations, including changes from a pre-Late Triassic marginal cratonic basin to a Late Triassic-Late Jurassic flexural basin and then to a late Late Jurassic-Early Cretaceous rift basin. In response to two violent intraplate deformation at Late Triassic and Late Jurassic, coarse fluvial depositional systems in Xingshikou and Tuchengzi Formations were deposited in front of thrust belts. Controlled by transform and extension faulting, fan deltas and lacustrine systems were deposited in Early Cretaceous basins. The composition of clastic debris in Late Triassic and Late Jurassic flexural basins respectively represents unroofing processes from Proterozoic to Archean and from early deposited, overlying pyroclastic rocks to basement rocks in provenance areas. Restored protobasins were gradually migrated toward nearly NEE to EW-trending from Early Jurassic to early Late Jurassic. The Early Cretaceous basins with a NNE-trending crossed over early-formed basins. The Early-Late Jurassic and Early Cretaceous basins were respectively controlled by different tectonic mechanisms. 相似文献