共查询到20条相似文献，搜索用时 948 毫秒
1.
由“大别山超高压变质作用与碰撞造山动力学”编写组著的“大别山超高压变质作用与碰撞造山动力学”一书,2005年由科学出版社出版。全书共210页,后附彩色图版10幅,另袋附“大别山造山带地质图(1∶500000)”和“大别山造山带构造纲要图(1∶500000)”,由6个部分组成。“大别山碰撞造山带的地质构造”一章由徐树桐、索书田、钟增球、刘贻灿和陈冠宝撰写,介绍该带的构造—岩石单位、几何结构、运动学特征和变形构造。“大别山—苏鲁地区的超高压变质作用”一章由从柏林、王清晨、叶凯和刘景波撰写,探讨了超高压变质岩的形成深度、折返的P T轨迹… 相似文献
2.
天水渭北地区的变质花岗岩类地质特征 总被引：1，自引：1，他引：1
天水渭北地区地处祁连与北秦岭造山带结合部位。通过详细的岩石学特征、接触关系、形变及变质特征研究，从变质地层中识别和解体出众多的变质花岗岩体。主要成岩期及代表性岩类有：中元古界为片麻状花岗闪长岩-二长花岗岩，震旦纪为片理化闪长岩。采用多种构造判别图解，获得了重要的构造环境信息。中元古界的花岗岩类是板块碰撞前过渡性结晶基底上局部熔融花岗岩类。震旦纪花岗岩类与板块碰撞作用密切有关，是碰撞造山一碰撞后抬升这一过程形成的花岗岩类。花岗岩类记录了祁连地块与秦岭地块碰撞的重要证据。 相似文献
3.
大别山榴辉岩一片麻岩杂岩的成因 总被引：2，自引：1，他引：1
大别山榴辉岩由辉长岩、大陆拉斑玄武岩和少量泥灰质经高压变质作用形成。大别地块可划分出四个形成条件不同的榴辉岩区,它们代表一种构造－岩石组合体。片麻岩杂岩中各种高压变质岩类的发现证明它们与榴辉岩一起经历了原地高压变质过程。二者变质作用Ｐ－Ｔ参数的差异归因于抬升过程中退变质反应速度的不同。不同地区榴辉岩退变质组合及Ｐ－Ｔ条件与围岩的一致性表明,大别杂岩现今所展示的“递增”变质带是由榴辉岩相退变质作用形成的。高压榴辉岩－片麻岩杂岩的产生是印支期扬子与华北两个大陆板块碰撞的结果。 相似文献
4.
大别造山带的构造演化 总被引：5，自引：0，他引：5
大别地块是扬子地块北缘中晚元古代古岛弧的一部分，加里东期，它作为扬子地块北部陆缘的水下隆起，与华北地块南缘的早古生代古岛弧碰撞拼合，古洋壳消失，完成了南北两大陆块的对接，开始进入漫长的陆内俯冲时期，大别造山带就是扬子地块，大别地块和华北地块在陆内俯冲作用下，依次叠覆的结果，印支期是大别山的主变形期和高压动力变质时期，燕山期是主要的造山期，基底剪切引起地壳重熔，导致大范围的热流变质作用。大别地块的降 相似文献
5.
大别山是中国东部中朝大陆板块与扬子大陆板块之间的碰撞造山带。具有薄皮构造的性质。组成两个碰撞大陆之间的滑脱（冲断剪切）带的岩石就是碰撞混杂岩组合。大别山由于剥露较深,仰冲壳楔完全被剥蚀,超高压变质带大面积出露,识别出碰撞混杂岩组合是对大别山进行几何分析的必要步骤。大别山碰撞混杂岩组合可分为南北两部分。北部为条带状片麻岩-超镁铁岩组合,南部为云母斜长片麻岩-榴辉岩组合,这两个组合的大部分都经历过超高压变质作用。它们的共同特点是具有宏观的＂碎斑结构＂和混杂作用。罗田穹隆是造山过程中早期形成的双冲式背斜,最后在造山晚期因东西向缩短的叠加而形成穹隆。 相似文献
6.
7.
中央山系大别,东秦岭和东昆仑造山带最古老岩系变 … 总被引：1，自引：1，他引：0
大别造山带,东秦岭造山带和东昆仑造山带是中国中央山系的主要构成部分,每个造山带古老岩系的变质作用过程各具特色,大别山最古老岩系大别岩群于印支期内俯冲碰撞,发生了区域性的中偏高压区域变质作用,顺时针型ｐｔ轨迹ｔｍａｘ和ｐｍａｘ近于同时达到,退这质轨迹段斜率陡,埋深后受构造驱动快速抬升到上中地壳,东秦岭是古老系秦岭岩群在要期（约１．０Ｇａ前）初始板块构造总背景下发生强烈的中压型碰撞变质作用,顺时针型ｐ 相似文献
8.
桐柏山高压变质带及其区域构造型式 总被引：23，自引：4，他引：23
桐柏山是秦岭－大别山造山带的重要组成部分。新近的构造学和岩石学详细研究表明，该区广泛分布有大量的、大小不一的榴辉岩及退变质榴辉岩块体，构成一个延展长约200km和宽约40km的高压变质带。由榴辉岩或退变质榴辉岩、遭受过高压变质作用的沉积和火山岩、由榴辉岩退变质而成的片麻岩和片岩，以及面理化的含榴或不含榴的花岗岩组成的高压变质单位（HP），在组成及变质演化特征方面，均与大别－苏鲁地区的高压单位类似。构造上，显示一典型的西北美型变质核杂岩。分隔开由桐柏杂岩组成的核部杂岩单位（CC）及上覆的高压单位的km尺度的伸展拆离带，具有下和中伸展拆离带的复合性质，是在高压变质作用期后伸展体制下形成的。桐柏山高压变质带是与大别山地区的高压变质带相联接的，据其岩石学、构造学及相关的主要构造边界展布特征，推测该高压变质带穿过南襄盆地有继续向东秦岭延伸的趋势。桐柏山高压变质带是东秦岭造山带与大别－苏鲁超高压和高压变质带间的构造纽带。 相似文献
9.
中央山系大别-东秦岭和东昆仑造山带最古老岩系变质过程对比 总被引：3，自引：2，他引：1
大别造山带、东秦岭造山带和东昆仑造山带是中国中央山系的主要构成部分,每个造山带古老岩系的变质作用过程各具特色．大别山最古老岩系大别岩群于印支期陆内俯冲碰撞,发生了区域性的中偏高压区域变质作用,顺时针型ｐｔ轨迹上ｔｍａｘ和ｐｍａｘ近于同时达到,退变质轨迹段斜率陡,埋深后受构造驱动快速抬升到上中地壳．东秦岭最古老岩系秦岭岩群在晋宁期（约１．０Ｇａ前）初始板块构造总背景下发生强烈的中压型碰撞变质作用,顺时针型ｐｔ轨迹上ｔｍａｘ在压力大幅度降低的过程中达到,反映弧陆碰撞增厚后深埋岩系受重力均衡抬升;至加里东期,秦岭岩群再次在板块构造的总背景下发生岛弧型变质,局部叠加中压型接触变质作用;晚海西以来北秦岭东段缺乏高于低角闪岩相条件的区域变质作用记录．东昆仑造山带最古老岩系于吕梁或早吕梁期发生中压碰撞区域变质,主体为角闪岩相,局部高角闪岩相－麻粒岩相条件,造山带剥露较浅使低压变质带得以良好保存． 相似文献
10.
大别-苏鲁造山带在朝鲜半岛可能的构造表现 总被引：12，自引：0，他引：12
在晚二叠世—早三叠世期间,中国的华北与扬子板块俯冲碰撞形成了大别-苏鲁造山带。针对这次碰撞作用向东在朝鲜半岛的延伸方式,近些年来不同学者提出了多种模式,但都有其局限性。通过比较临津江带、沃川带与大别造山带之间的构造活动关系,结合已有的变质地质学和地质年代学数据,建立了大别-苏鲁造山带在朝鲜半岛的东延模式。推测自临津江带至沃川带构成了一条较完整的中生代造山带,即大别-苏鲁造山带在朝鲜的东部延伸,原来意义上的“京畿地块”已不复存在。而岭南地块上与华北板块相似的信息可能是造山作用后期伸展拆离作用下来自朝鲜半岛北部的外来构造岩片所致。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
14.
15.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
16.
正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
17.
正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
18.
正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
19.
正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
20.
正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献