基于ArcGIS平台的芦山地震强震动记录分析

利用ArcGIS平台的探索性空间数据分析(ESDA)模块,将四川省强震台所记录的芦山地震强震动进行Histogram、QQplot图、半变异协方差函数云图、Voronoi地图分析,研究芦山地震强震动的特征及原因.结果表明:原始数据不服从正态分布,以宝兴地办、宝兴民治、盐源泸沽、盐源干海等台站记录离群较为明显;经过对数变换后的强震动三分量线性关系较好,宝兴地办台站的记录未出现离群现象,宝兴民治、宝兴明礼等台记录的离群现象不太明显.东西向和南北向的地震动密集度集中在西北角,收敛过渡密度区域位于龙门山山前的大邑断裂附近,与芦山地震的发震构造有较好的一致性;垂直向的地震动记录密集度集中在北部地区,而南部较为稀疏,可能与巴颜喀拉块体前缘整体随应力场变化往南移动有关系.     

东太平洋克拉里昂-克里帕顿断裂带WPC1101沉积柱样磁性地层及沉积环境

对采自东太平洋CC区西部的WPC1101重力活塞柱样进行了岩石磁学、古地磁极性地层及古生物地层年代学研究工作。等温剩余磁化强度（IRM）、磁滞回线和反向场退磁曲线测试结果表明,沉积物中的磁性矿物主要为磁铁矿,仅在柱状样底部存在少量赤铁矿/针铁矿。340~350 cm发育的埋藏结核层,标志着一处沉积间断的存在;60~336 cm发育上新世晚期的硅藻化石Cosinodiscus nodulifer,但古地磁极性地层缺失上新世-第四纪的2r反极性时;0~60 cm见第四纪标准化石Pseudoenuotia doliolus、Spongaster tetras,且顶部缺失1正极性时。综合对比古生物地层学、磁性地层学以及邻近区域地层学特征,认为该柱状样记录了从晚渐新世至第四纪的沉积历史,期间存在晚渐新世至早上新世、上新世晚期至第四纪早期及第四纪晚期3个时期的沉积间断,上述沉积间断的形成可能是南极底流的形成与增强、CCD界面抬升及海底侵蚀作用增强共同控制的结果。     

雷电灾害风险评估报告制作管理系统设计与实现

以GB/T 21714.2为基础,以Delphi7.0为开发语言,融合Gis叠加、Microsoft Word自动化等计算机技术,研制而成了一套程序化、智能化、规范化的多功能业务系统,提高了原有雷电灾害风险评估业务的规范性,缩短了评估流程,提高了评估精度。     

岩溶水流系统识别方法及其在引调水工程隧洞选线中的应用

某国家重大引调水工程引水隧洞将穿越聚龙山向斜可溶岩地层,可能面临严重岩溶涌突水问题.为了查明隧洞突涌水条件,选择岩溶水害风险较低的引水方案,综合采用岩溶水文地质调查、水化学与同位素分析等方法对聚龙山向斜岩溶水流系统特征进行了识别.结果 表明:聚龙山向斜含水系统具有"两含夹一隔"的多层结构,下部二叠系主要为埋藏型岩溶弱发...     

Improvement and Application of Riedel Shear Systerm

For some strain in the strike slip zone is difficult to be determined accurately in the classification scheme of the 7 elements of the ellipse of the strike slip strain ellipse (PDZ, R, R', P, T, Y and local contraction), the properties of the strain elements in all directions in the strained ellipse were reunderstood by analyzing the causal relationship between the mechanical state and the strain properties in a certain direction. A new model of the Riedel shear system was proposed, which contained 4 pure strain zones (pure right walk slip, pure left walking slip, pure extrusion, pure Stretch Strain Zone) and 4 complex strain zones (both stretching and right walking, both stretching and left walking, both extrusion and left walking, both extrusion and right walking slip strain zone). The closer the crack was to the direction of a single strain band, the stronger the corresponding property. The model included all the elements of the traditional model and made up for its vacancy. It proved the rationality of the left (right) row left (right) order and the double tectonic belt rule. At the same time, three research examples of Bohai Sea were cited to illustrate the application of the model: (1) The synchronous and perpendicular spatial-temporal relationship between compressive and extensional stress fields in strike-slip zones, as well as the unified but not contradictory dialectical relationship between them, were illustrated through the example of the co-controlled cycle formation of northeastern depression in Laizhou Bay Depression; (2) The Bohai Sea walk was enumerated. The research results of the slip transition zone illustrated the strain trend law of the extensional or compressive transition zone in the strike-slip zone; (3) The relationship between the strike of the effective fracture and the extensional strain zone in the present strike-slip stress field was illustrated by giving an example of the effective fracture research results of a buried hill structure in the Bohai Sea.     

二叠纪贵州遵义次级裂谷盆地结构及其对锰矿的控制作用*

遵义锰矿不仅是在贵州发现最早的具工业价值的锰矿床,而且也是中国重要的锰资源基地之一。根据详细的二叠系茅口组—龙潭组地层划分,认为黔北裂陷遵义次级裂谷盆地由3个Ⅲ级断陷盆地和2个Ⅲ级隆起组成,至少包括13个Ⅳ级断陷盆地。3个Ⅲ级断陷盆地的演化,分别控制了铜锣井—深溪、转龙庙—谢家坝、张家湾—兴隆、和尚场—五龙溪锰矿成矿亚带的形成,其中铜锣井—深溪锰矿成矿亚带位于遵义次级裂谷盆地的中心,成矿作用强烈,已发现有铜锣井、深溪、永安3个大型锰矿床。Ⅳ级断陷盆地的发育,控制了研究区内各个锰矿床的形成。研究区内同沉积断层发育,已辨别出的14条同沉积断层为深部含硅、锰质气液的上升通道,是遵义二叠系锰矿形成的关键。综上,遵义次级裂谷盆地的发育和演化,对该地区锰矿沉积具有重要的控制作用。该研究成果对寻找遵义锰矿隐伏矿床、指导整装勘查具有重要的意义。     

Tourmaline geochemistry and boron isotopic variations as a guide to fluid evolution in the Qiman Tagh W-Sn belt,East Kunlun,China

The Qiman Tagh W-Sn belt lies in the westernmost section of the East Kunlun Orogen, NW China, and is associated with early Paleozoic monzogranites, tourmaline is present throughout this belt. In this paper we report chemical and boron isotopic compositions of tourmaline from wall rocks, monzogranites, and quartz veins within the belt, for studying the evolution of ore-forming fluids. Tourmaline crystals hosted in the monzogranite and wall rocks belong to the alkali group, while those hosted in quartz veins belong to both the alkali and X-site vacancy groups. Tourmaline in the walk rocks lies within the schorl-dravite series and becomes increasingly schorlitic in the monzogranite and quartz veins. Detrital tourmaline in the wall rocks is commonly both optically and chemically zoned,with cores being enriched in Mg compared with the rims. In the Al-Fe-Mg and Ca-Fe-Mg diagrams,tourmaline from the wall rocks plots in the fields of Al-saturated and Ca-poor metapelite, and extends into the field of Li-poor granites, while those from the monzogranite and quartz veins lie within the field of Li-poor granites. Compositional substitution is best represented by the MgFe_(-1), Al(NaR)_(-1), and AlO(Fe(OH))_(-1) exchange vectors. A wider range of δ~(11)B values from -11.1‰ to -7.1‰ is observed in the wall-rock tourmaline crystals, the B isotopic values combining with elemental diagrams indicate a source of metasediments without marine evaporates for the wall rocks in the Qiman Tagh belt. The δ~(11)B values of monzogranite-hosted tourmaline range from -10.7‰ and-9.2‰, corresponding to the continental crust sediments, and indicate a possible connection between the wall rocks and the monzogranite. The overlap in δ~(11)B values between wall rocks and monzogranite implies that a transfer of δ~(11)B values by anataxis with little isotopic fractionation between tourmaline and melts. Tourmaline crystals from quartz veins have δ~(11)B values between -11.0‰ and-9.6‰, combining with the elemental diagrams and geological features, thus indicating a common granite-derived source for the quartz veins and little B isotopic fractionation occurred. Tourmalinite in the wall rocks was formed by metasomatism by a granite-derived hydrothermal fluid, as confirmed by the compositional and geological features.Therefore, we propose a single B-rich sedimentary source in the Qiman Tagh belt, and little boron isotopic fractionation occurred during systematic fluid evolution from the wall rocks, through monzogranite, to quartz veins and tourmalinite.     

用应变模态技术诊断梁结构的损伤

重点研究损伤对应变模态影响规律及其灵敏程度.根据计算结果,损伤处附近发生突变,损伤30%时突变区为梁长的12.5%.应变模态对非节点损伤非常敏感,应变模态也有明显改变,尤其是跨中损伤第1阶、四分之一跨损伤第3和第2阶.跨中损伤时,1阶应变模态除突变区外大多数应变几乎呈均匀下降趋势.四分之一跨损伤30%时,3阶应变模态第1峰值区及2阶模态第1、第2峰值区应变振型值下降至58.6%、71.9%及84.2%.所以,可利用应变模态的敏感性确定损伤位置和程度.