阿尔泰造山带的构造运动   总被引：23，自引：2，他引：23  

曲国胜  何国琦 《地质学报》1992,66(3):193-205

变形式样、建造类型及同位素年代学数据研究表明,阿尔泰造山带依次经历了5期构造运动,即:喀纳斯运动,形成白哈巴组(O_3)与哈巴河群(Z—O_2)间的角度不整合;大桥运动(S_3—D_(1—2)),形成海西早期类拗拉谷拉张陆壳区;阿尔泰运动(海西中晚期)导致陆内斜向碰撞并形成大型剪切弧型推覆构造系,为强烈造山阶段;泛阿尔泰运动(海西末至印支期)导致山脉整体隆起及剥蚀;喜马拉雅运动,导致新生代以来造山带各断裂系的复活及断块隆起。  相似文献   

关于大别运动的新认识   总被引：4，自引：0，他引：4  

张业明  熊成云  韦昌山 《地球学报》1996,17(1):11-18

本文依据红安群（宿松群）和大别山杂岩在岩石建造和变形、变质改造等方面的重大差异以及其间残存的角度不整合面，进一步肯定了大别运动的存在。大别运动主要发生时间为２５００Ｍａ左右，区域上大致可与华北地台阜平运动对比，是大别山地区原始硅铝质陆壳形成和韧性再造的变革运动。初步将大别旋回划分出早期伸展、中期挤压和晚期走滑剪切３个变形幕。指出了大别运动界面是大别山上部地壳极其重要的滑脱界面和层圈构造，沿袭这一古老构造薄弱面曾先后发生了韧性滑覆、脆－韧性逆冲推覆和脆性剥离等变形事件。  相似文献   

吉林珲春地区大荒沟花岗岩岩基的岩浆演化和构造环境   总被引：1，自引：0，他引：1  

姜开君  周永昶 《地质论评》1993,39(5)

大荒沟岩基形成于242—220Ma间,为晚海西—早印支期花岗质岩石系列。岩石类型为花岗闪长岩—二长花岗岩—钾长花岗岩,岩系具有酸度高,富Na、Fe,相对贫Mg、K、Rb和REE的特点,属于铝弱过饱和的钙碱性岩系。岩源物质可能为具拉斑玄武质特征的火成岩。花岗闪长岩和二长花岗岩形成于造山运动旋回的早期阶段,而钾长花岗岩属于造山运动晚期阶段的产物,整个岩系的形成反映了一个造山旋回的深成岩浆作用过程。  相似文献   

塔里木盆地东北部地区充填序列的物源分析     

曹守连  陈发景 《新疆地质》1994,(3)

塔里木盆地东北部志留、泥盆纪、中新生代充填序列的岩性，主要为硅质碎屑岩。作者采用点计法对该充填序列中的砂岩进行了骨架矿物统计分析，结合区域地质构造背景研究认为：库车拗陷的物源区为南天山造山带，沉降中心的充填序列，记录了南天山造山带的揭顶剥蚀史。志留一泥盆纪时，塔东北拗陷的物源区为北部古塔北隆起和加里东中期抬升的寒武－奥陶系和东北角的库鲁克塔格隆起；三叠－侏罗纪时，物质来源主要为海西运动时形成的沙雅隆起和库鲁克塔格隆起；自白垩纪以来，坳陷主要接受南天山造山带的物质。物源区的类型不仅随着坳陷的演化而变化，而且同一源区的物质也随其被搬运的距离增大而造成不同的砂岩矿物组成。  相似文献   

On the growth and collapse of wide orogenic belts   总被引：1，自引：0，他引：1  

Jichun Sun  Stanley A. F. Murrell 《Geophysical Journal International》1994,118(1):255-268

  相似文献   

The Orogeny in the Altaides1     

Qu Guosheng  He Guoqi 《《地质学报》英文版》1993,6(1):1-16

Abstract Studies of the deformation styles, formation types and isotopic age data indicate that the Altaides has successively experienced 5 stages of orogeny: (1) the Kanas orogeny forming the angular unconformity between the Baihaba Formation (O₃) and the Habahe Group (Z-O₂); (2) the Daqiao orogeny (S₃-D_1-2) giving rise to the early Hercynian quasi-aulacogen extensional continental crust of the area; (3) the Altay orogeny (middle- late Hercynian) leading to the oblique intracontinental collision and the formation of large shear arc-shaped thrust system and representing a strong orogeny stage; (4) the pan-Altay orogeny (latest Hercynian-Indosinian) resulting in the uplifting and erosion of the mountains as a whole; (5) the Himalayan movement causing the rejuvenation of fault systems and block uplift of the Altaides since the Cenozoic.  相似文献   

滇西北地区第三纪的逆冲－推覆构造   总被引：18，自引：0，他引：18  

吴根耀 《大地构造与成矿学》1994,18(4):331-338

滇西北地区始新－渐新世的逆冲断裂系走向南北，向西倾，向东变晚，受新特提斯闭合和碰憧控制；中新世晚期－上新世早期的逆冲断裂系走向东西，朝北倾，与青藏高原的隆升有关，见于高原边缘。它们构成前导叠瓦扇，局部有反冲现象，以推覆距离小、影响深度浅为特征，控制了磨拉石盆地、浅成斑岩和膏盐底辟体的发育，在其西和其北分别发育与之对称的逆冲断裂系，构成科伯构造。  相似文献   

大别山印支运动的同位素年代学证据   总被引：11，自引：1，他引：11  

李曙光  刘德良 《大地构造与成矿学》1990,14(2):159-163

本文根据Sm-Nd同位素年代学成果论证了大别山印支运动的表现。主要依据:(1)阿尔卑斯型橄榄岩的侵入(244±11Ma);(2)辉石岩类超基性岩浆岩的侵入(231±61Ma);(3)高压低温变质岩(如C型榴辉岩)的生成(221±20-224±5Ma)。它们都发生在印支早期,并从而证明了华北陆块、大别山微型陆块、扬子陆块三者是在早三叠世拼接在一起的。在此之前,华北陆块和扬子陆块之间存在一古特提斯洋。  相似文献   

河南省金矿构造控矿研究     

杨群周  彭省临 《河南国土资源》2000,(2)

本文运用地洼成矿理论对河南省内金矿床的构造控矿特征进行了总结 ,认为构造是主要的控矿因素 ,它们主要表现为不同型式、不同规模、不同期次的构造对金矿成矿的控制作用。并对构造控矿机制进行了探讨。  相似文献   

Palaeosols in early Himalayan foreland basin sequences demonstrate latitudinal shift-related long-term climatic change     

B. P. SINGH  S. K. TANDON†  G. P. SINGH  J. S. PAWAR‡ 《Sedimentology》2009,56(5):1464-1487

The Palaeogene sedimentary record in the Himalayan foreland basin contains palaeosols that are interpreted as reflecting changes in climate through time with the passage of the Indian Plate from the equator to 30° N latitude. To understand spatial and temporal variation in the occurrence of diagnostic palaeosol types, 12 exposed stratigraphic sections were investigated and studied in detail using petrographic and geochemical techniques, including scanning electron microscopy and X‐ray mineralogy. Oxisol (bauxite) is a karst bauxite that occurs in crudely bedded and laminated forms. It contains gibbsite, goethite and kaolinite and shows chemical index of alteration values close to 100, demonstrating intense weathering. No gradual change in the concentrations of trace and rare earth elements is recorded. However, their behaviour suggests that the Oxisol was produced by weathering of basalt under a warm and humid climate. Histosol (coal), found stratigraphically higher than Oxisols, contains woody structures dominated by vitrinite maceral. The Histosol is interpreted as having originated from an undisturbed peat developed in a swamp of high tree density under wet tropical climatic conditions. Up‐section, calcrete profiles of stages 3 and 4, containing rhizoliths, pellets, filamentous calcite and Microcodium, have developed by pedogenic processes. Large negative stable carbon (?8·5‰ to ?11·2‰) and oxygen isotope values (?8·5‰ to ?12·6‰) suggest that the studied calcretes formed under the influence of meteoric water and soil organic matter in dry sub‐tropical climatic conditions. The formation of Oxisol in a warm and humid climate was possible in the equatorial region when part of the Indian subcontinent was close to the equator. The coal developed under a humid climate when the northern tip of the Indian subcontinent reached the intertropical convergence zone, while the pedogenic calcrete formed once the sub‐tropical climatic zone was reached. Hence, it is suggested that these palaeosols formed in different climatic zones during northward drift of the Indian plate and that the drift brought them to their present positions between 30° N and 35° N within the sub‐tropical climatic zone.  相似文献