广饶县节约集约利用土地探讨     

张鹏 《山东地质》2010,(7):69-70

通过对广饶县土地利用状况进行分析,找出土地利用中存在的建设用地需求量增大、工业项目土地利用率低等问题,并从加强耕地保护工作,拓展发展空间、提供资源保障,加强调控、提升配置效率等方面提出了相应的对策措施。  相似文献   

鲁豫交界地区尾波Q_c值分析研究     

苏道磊  刘财  刘希强  周彦文  董晓娜 《山东地质》2010,(9):31-36

该文对濮阳台记录的21次地震进行了地震波衰减研究,讨论了地球介质品质因子随频率变化的关系;利用不同地震采用不同流逝时间的尾波品质因子测定方法,有效去除了由于不同地震或同一地震的地震散射波在纵向介质中穿透深度的不同而导致对品质因子测量结果的影响,从而有利于扑捉到品质因子的异常变化特征与地震孕育过程的关系。利用改进后的模型,对鲁豫交界地区尾波值进行了计算,得到了该地区品质因子随频率的变化关系和区域介质衰减的时间变化特征。  相似文献   

土地综合整治动态管理信息系统构建分析     

许鹏  张欣  高宁  吕媛媛 《山东地质》2010,(9):46-49

在调研山东省土地综合整治现状的基础上提出了当前工作中存在的问题,并对建立土地综合整治动态管理信息系统的必要性进行了分析。提出基于3S技术、ArcGIS软件平台、计算机技术、网络技术,构建土地综合整治动态管理信息系统的设想,有利于提升山东省土地综合整治项目管理水平。  相似文献   

REE, Mn, Fe, Mg and C, O Isotopic Geochemistry of Calcites from Furong Tin Deposit, South China: Evidence for the Genesis of the Hydrothermal Ore-forming Fluids     

Yan Shuang  Xian-Wu Bi  Rui-Zhong Hu  Jian-Tang Peng  Hang Li  Da-Hua Li    Chang-Sheng Zhu 《Resource Geology》2010,60(1):18-34

The Furong tin deposit in the central Nanling region, South China, consists of three main types of mineralization ores, i.e. skarn-, altered granite- and greisen-type ores, hosted in Carboniferous and Permian strata and Mesozoic granitic intrusions. Calcite is the dominant gangue mineral intergrown with ore bodies in the orefield. We have carried out REE, Mn, Fe, and Mg geochemical and C, and O isotopic studies on calcites to constrain the source and evolution of the ore-forming fluids. The calcites from the Furong deposit exhibit middle negative Eu anomaly (Eu/Eu*= 0.311–0.921), except for one which has an Eu/Eu* of 1.10, with the total REE content of 5.49–133 ppm. The results show that the calcites are characterized by two types of REE distribution patterns: a LREE-enriched pattern and a flat REE pattern. The LREE-enriched pattern of calcites accompanying greisen-type ore and skarn-type ore are similar to those of Qitianling granite. The REE, Mn, Fe, and Mg abundances of calcites exhibit a decreasing tendency from granite rock mass to wall rock, i.e. these abundances of calcites associated with altered granite-type and greisen-type ores are higher than those associated with skarn-type ores. The calcites from primary ores in the Furong deposit show large variation in carbon and oxygen isotopic compositions. The δ¹³C and δ¹⁸O of calcites are −0.4 to −12.7‰ and 2.8 to 16.4‰, respectively, and mainly fall within the range between mantle or magmatic carbon and marine carbonate. The calcites from greisen and altered granite ores in the Furong deposit display a negative correlation in the diagram of δ¹³C versus δ¹⁸O, probably owing to the CO₂-degassing of the ore-forming fluids. From the intrusion to wall-rock, the calcites display an increasing tendency with respect to δ¹³C values. This implies that the carbon isotopic compositions of the ore-bearing fluids have progressively changed from domination by magmatic carbon to sedimentary carbonate carbon. In combination with other geological and geochemical data, we suggest that the ore-forming fluids represent magmatic origin. We believe that the fluids exsolved from fractionation of the granitic magma, accompanying magmatism of the Qitianling granite complex, were involved in the mineralization of the Furong tin polymetallic deposit.  相似文献   

Assessment of the risk of rockfalls in Wu Gorge, Three Gorges, China   总被引：3，自引：0，他引：3  

Huang Bolin  Chen Lide  Peng Xuanming  Liu Guanning  Chen Xiaoting  Dong Haogang  Lei Tianci 《Landslides》2010,7(1):1-11

In 2007 and 2008, six big damaging rockfalls occurred at four sites in Wu Gorge, the second gorge of the Three Gorges, China. Detailed surveys and aerial-photographic interpretation identified 104 potentially dangerous rock masses. This paper reviews previous rock-mass risk ratings, examines dangerous rock-mass structure and presents a new assessment system for rockfall risk (ASRFR) in the Wu Gorge area. The ASRFR considers 15 factors: seven factors for hazard and eight factors for consequence. Relative importance weights for these factors are ascertained using an analytic hierarchy process. Using an equation to calculate the risk, the 104 dangerous rock masses were divided into three risk groups: high risk (33 sites), medium risk (33 sites) and low risk (38 sites). The ASRFR analysis can be used to divide the shipping route through the Wu Gorge into seven courses each of one of three classes: safe-route regions, yellow-alarm regions and red-alarm regions. The system provides geological information and a rockfall-risk management tool for local government and the shipment-route department.  相似文献   

江西九江城门山铜多金属矿床土壤轻烃找矿试验   总被引：1，自引：0，他引：1  

王永华  龚敏  龚鹏  熊燃  赵波  曾键年  马振东 《地质通报》2010,29(7):1056-1061

在开展城门山矿区新一轮的深部外围找矿过程中,传统的化探方法存在一定的局限性。本次工作在城门山矿区内蚀变矿化石英斑岩、矿区外围石英砂岩上方发育的土壤垂直剖面和1线、9线、J0线土壤测线中开展了系统的轻烃测量,尝试利用土壤轻烃异常示踪下伏的矿化信息。研究结果表明,除甲烷(C1)外,土壤轻烃(C2、C3、C4、C5)都能很好地示踪下伏的矿化信息,在花岗闪长斑岩(矿体)上方显示低值区,与土壤Hg气、磁化率高值形成镶嵌结构。通过对硫化物矿体上覆土壤的有机烃组分相关特征和变化规律的分析,可提出预测下伏矿体的评价指标,也有助于了解有机质在成矿作用过程中的赋存状态和演化规律。  相似文献   

Comparisons of drought variability between central High Asia and monsoonal Asia: Inferred from tree rings   总被引：1，自引：0，他引：1  

Keyan Fang  Xiaohua Gou  Fahu Chen  Fen Zhang  Yingjun Li  Jianfeng Peng 《Frontiers of Earth Science》2010,4(3):277-288

Severe drought is a serious natural disaster that frequently strikes East Asia, highlighting the need to understanding its drought regime and the associations with Asian monsoon. Tree-ring-based drought reconstructions provide invaluable paleoclimatic archives for detecting regional and large-scale drought variability and their potential forcings. We herein reviewed many drought reconstructions from central High Asia and monsoonal Asia and compared their similarities and differences, as well as their linkages to Asia monsoon. We compared the decadal-scale variability of six drought reconstructions for the central High Asia, where differing drought variations were found between the western and eastern portions. Seven drought reconstructions were reviewed for monsoonal Asia, from which a difference in drought variability was observed between the northern and southern parts. Therefore, we compared the drought variations of the four sub-regions of western and eastern parts of central High Asia, as well as northern and southern portions of monsoonal Asia. ENSO activity and sea surface temperature of western Pacific and northern Indian Oceans, coupled with Asian monsoon, play an important role in modulating drought variability of much area of the East Asia. An improved denser multi-index tree-ring network of longer length for East Asia is necessary for the establishment of more reliable large-scale drought reconstruction.  相似文献   

滇西三江地区中新生代“盆山”耦合运动学过程   总被引：3，自引：0，他引：3  

杨鑫  苏龙  刘兴旺  刘玉虎  刘燕红  郑建京 《华北地质》2010,33(2):81-88

滇西三江地区中新生代盆山格局是研究盆山耦合的典型实例。本文通过解析该区叠加构造变形期次和样式,理清其中新生代的盆山耦合关系,并探讨思茅盆地对相邻造山演化的沉积响应过程。研究表明,三江地区经历了主碰撞造山带与前陆盆地耦合(T1-T2)、后碰撞造山带与伸展盆地耦合(T3-K)以及陆内"盆山"共变(E-Q)三个盆山耦合运动学过程。兰坪-盆地内复理石、山前磨拉石到红色碎屑岩的沉积序列响应了相邻造山带从主碰撞阶段向后碰撞阶段的演化,该阶段盆地转换过程受控于拆沉作用和岩浆底侵作用等深部动力学机制。  相似文献   

四川盆地东北部飞仙关组优质储层特征   总被引：1，自引：0，他引：1  

毕海龙  李斌  彭军  张良华  陈波 《海相油气地质》2010,15(2):30-35

对四川盆地东北部下三叠统飞仙关组地质、测井和地震数据的分析表明,该区优质储层多由残余鲕粒白云岩构成,储集空间以裂缝-孔隙型为主,属于中等孔隙度高渗透率性质的储层。优质储层测井曲线多具有低伽马、低速度、低密度和高中子孔隙度的"三低一高"特征,地震反射响应特征为中—强反射振幅并和地层顶底面反射形成典型的"亮点",可利用约束稀疏脉冲反演表征储层的纵横向分布。认为地质与地震相结合是预测飞仙关组优质储层的有效方法。  相似文献   

基于全基因组重测序技术的浙江近岸海域耐盐金黄色葡萄球菌(Staphylococcus aureus)耐药机制解析<     

张旨轩  王子言  王泽  刘岩  刘松怡  钱鹏宇  叶欢  韩姣姣  周君  苏秀榕 《海洋与湖沼》2022,53(2):394-404

金黄色葡萄球菌(Staphylococcus aureus)是近岸海域海水中的主要病原菌,严重威胁接触者的安全。抗生素处理是治疗金黄色葡萄球菌感染的重要手段,其耐药性的发生受到了高度重视。采用全基因组重测序与KEGG富集分析结合的方法,对红霉素(erythromycin)、氯霉素(chloramphenicol)和万古霉素(vancomycin)处理后的耐盐金黄色葡萄球菌(S.aureus ZS01)和不耐盐金黄色葡萄球菌(S.aureus 502A)进行耐药机制研究。结果表明,S.aureus 502A经抗生素处理后发生突变的程度大于S.aureus ZS01,二者在经过氯霉素处理发生了更大程度的突变。红霉素、氯霉素和万古霉素处理主要影响了金黄色葡萄球菌的致病能力;红霉素和氯霉素可能通过影响金黄色葡萄球菌脂类的代谢引起其耐药性的变化。除此之外,三种抗生素处理均出现了较多TIGR01741家族蛋白和假设蛋白基因的突变,推测与菌株的耐药性和致病性相关。耐盐金黄色葡萄球菌可通过外排系统作用产生红霉素耐药性,不耐盐菌株因细胞壁成分相关基因的突变提高了对万古霉素的耐受性。研究结果可为耐盐和不耐盐金黄色葡萄球菌的耐药机制及抗生素对金黄色葡萄球菌致病性影响的研究提供基础数据。  相似文献