排序方式： 共有26条查询结果，搜索用时 15 毫秒
1.
云南绿春咪霞金矿成矿地质条件 总被引：1，自引：0，他引：1
咪霞金矿赋存在多元素高背景值下志留统薄层状蚀变板岩中,受北西向F6-1断裂及正长岩、煌斑岩控制,与多元素异常、黄铁矿化等多种围岩蚀变对应,具较好的成矿地质条件。 相似文献
2.
黄山高速公路穿行于皖南山区,公路建设过程中,汤口互通A匝道高边坡产生了大范围变形,严重威胁已有构筑物和施工安全。为保证边坡稳定,成立“应急指挥小组”,建立快速反应机制,并采用工程地质测绘、勘探、监测等手段,快速查明边坡结构特征,分析边坡变形机理和稳定性,提出应急治理方案。分析表明,该边坡为层间软弱夹层[JP2]发育的砂泥岩互层型顺向边坡,地质历史上边坡曾发生滑移—弯曲变形,公路施工时对弯曲隆起部位岩体进行开挖,引起坡体产生快速变形,在降雨、开挖等条件下,边坡产生整体失稳的可能性极大。在分析边坡变形机制基础上,应用变形控制理论,确定对边坡采取桩锚结合、综合排水的应急治理措施,并根据变形特点提出了应急治理施工步骤。应急治理措施实施后,边坡变形得到了有效控制,稳定性达到了高速公路的安全要求 相似文献
3.
吉南早元古代集安群构造解析 总被引：1，自引：0，他引：1
早元古代集安群经历了三期构造变形，分别形成了三个特征各异的构造形迹组合。Ⅰ世代为层理褶皱组合，由平卧褶皱、轴面片理和韧性剪切变形带组成；Ⅱ和Ⅲ世代为片理褶皱组合，分别由各种位态的片理褶皱和轴面褶劈理、膝折面理组成；Ⅰ、Ⅱ世代的原始构造线方位均为近南北向，为近共轴叠加，但因Ⅲ世代构造的强烈改造，现今多变位为东西向。Ⅰ世代构造形迹组合的特征显示集安群的早期构造环境具有构造层次较深、以近水平韧性剪切变形作用为主导的特点。 相似文献
4.
经资料整理、数理统计以及参照地区经验,认为场地工程性能一般,应采用桩基础或进行地基处理,提出合理岩土工程参数及地基处理方法、建议。 相似文献
5.
Small-scale heterogeneities like crossbedding hamper fluid flow and cause oil to be capillary trapped at the intersections of coarser to finer lamina. These effects are fairly well established, but less well established is the method to construct an adequate flow cell model containing critical hydraulic properties like bed-shape and -size, lamina-shape, -angle and boundaries. Nor is it trivial how to obtain those features from well and core. We therefore propose to systematically describe geometry and distribution of beds. To this end we make use of standard flow cell models that a priori contain all elements and boundaries of beds for a number of bedding types. 相似文献
6.
通过讨论层状断层的性质、特点以及与正断层、逆断层和走滑断层的相互关系,探讨了大陆板内地震的发震机制,指出许多地震的震源位于层状断层面上,有些地震在地表找不到相应的地震构造的原因是由层间滑动所引起。 相似文献
7.
The development and evolution of bedding parallel veins (BPV) are investigated in the Saint-Dominique carbonate slice (southern Québec Appalachian structural front), in order to emphasize the regional significance of BPV in a fold and thrust belt and their importance in establishing its structural and diagenetic evolution. Structural and microstructural analyses reveal that most BPV display a laminated structure locally crosscut by a massive one. Both structures show mutual crosscutting relationships with bedding parallel or bedding perpendicular stylolites and with bedding perpendicular veinlets, indicating that BPV cementation and deformation are continuous processes. Opening both sub-parallel and sub-perpendicular to the BPV walls are documented. Early BPV are planes of weakness that focus later reactivation, and evidence of successive and sometimes opposite senses of opening are locally preserved within a single BPV. The bedding parallel orientation of these veins proved particularly helpful in establishing the structural evolution of an area mostly characterized by front parallel structures with little crosscutting relationships otherwise. Petrographic and geochemical (δ18O VPDB and δ13C) analyses of structural cements suggest a common, locally derived source for the fluids that percolated through BPV, non-bedding parallel veins and faults. The isotopic ratios also reveal a significant enrichment in 18O and 13C through time. This evolution is tentatively correlated with tectonic, syn-convergence exhumation of the Saint-Dominique slice during its imbrication along the Appalachian structural front, after its burial under Taconian thrust sheets. 相似文献
8.
9.
机房沟变质核杂岩构造基本特征 总被引：2，自引：0，他引：2
１：５万区调中,于大黑山条垒北段机房沟地区发现四楞山碱长花岗岩北东、南西两侧的早古生代中酸性火山岩及碎屑岩中广泛发育了向外倾斜的中－深层次的顺层韧性变形带、剥离断层及二叠纪哲斯组构成的沉积盖层。总体反映为北东－南西拉伸作用形成的机房沟变质核杂岩构造。 相似文献
10.
The photo-sieving method enables the grain-size analysis of particles > 10 mm from unconsolidated openwork bedding surfaces. The accuracy is equal to the machine-sieving method. The sediment surface is photographed in the field using a camera stand. The enlarged print is digitized for computer processing by tracing the outlines of the pebbles. From the size and shape of the projection area of the individual pebble images the computer determines the ellipsoids of revolution, classifies these ellipsoids, and establishes their grain-size distribution in percentage by weight. Thus photo-sieving differs distinctly from point-counting techniques. With the aid of photo-sieving, the surface grain-size distributions of larger sedimentary systems may be regularly mapped. Alluvial fans, braided rivers, both onshore and offshore coasts or areas of relict sediments and manganese nodules are suitable for this method. 相似文献