李伍铜矿床控矿构造地质特征及演化模式探讨   总被引：11，自引：1，他引：11  

杜亚军  田竞亚 《四川地质学报》1996,(3)

四川李伍铜矿床是我国西南地区一个中型富铜矿床，其矿床历经了多期次的构造演化和叠加。江浪穹隆体的变形变质对早期的矿源层具改造、矿液初步富集作用；构造岩性层控制了李伍铜矿床的产出与分布，Ｓ３期沿Ｓ２面理发育起来的大型平卧褶皱控制了矿体的空间形态，成穹阶段形成的滑脱剪切带是矿液运移的通道，也是找矿的有利场所，该带中次级逆冲断面及ＥＷ向挤压时期形成的Ｓ３面理挠曲是容矿空间，变形与成穹作用双重机制对该矿床构造的形成至关重要。  相似文献   

唐海县地下水环境问题及保护对策     

刘硕  田西昭  张志强  翟星 《地下水》2010,32(3):92-93,96

研究了唐海县区域水文地质条件,分析了地下水资源量计开发利用状况,指出由于地下水超采引起地下水位下降、地面沉降、咸水入侵等生态环境问题,并针对存在问题,从优化布局、节约用水、完善监测等方面提出了应采取的各项保护措施,以确保地下水资源的可持续利用。  相似文献   

水文地质参数计算方法探讨     

侯龙君  祝田多娃  李法军 《地下水》2010,32(6):12-12,20

阐述了水文地质参数的重要性,及其发展和尚需完善的方面。推出可以解决基岩裂隙、溶隙含水层坐标距离与水力距离不一致问题的导水系数计算方法。该方法的特点是简捷,能较直观地判别含水层主要水文地质参数的大小,具有很高的可靠性。  相似文献   

基于强度折减法的韩城煤矿边坡稳定性分析     

王宇  田浩  余宏明 《岩土工程技术》2010,24(2):89-93

将有限元强度折减理论应用于边坡稳定性分析中,运用ANSYS大型有限元分析软件,基于Drucker-Prager（D-P）屈服准则,采用力和位移的收敛标准作为破坏判据,进行边坡的稳定性分析。当折减系数达到某一数值时,非线性有限元静力计算将不收敛,滑面上的位移将产生突变,边坡内一定幅值的广义剪应变自坡底向坡顶贯通,此时认为边坡已破坏,并定义此时的折减系数即为稳定系数。文中以韩城煤矿节理岩质边坡为例,运用该方法进行了稳定性分析并与并与传统的Bishop法、Janbu法等方法对比。计算结果表明,有限元强度折减法能更加真实地反映边坡的实际情况,求得的边坡稳定系数更接近边坡的实际稳定状态,显示出其在边坡稳定性分析中的一定优势。  相似文献   

鄂西地区牛蹄塘组钼钒矿地质特征及找矿远景探讨     

陈家林  田文  牟宗玉  聂开红 《华南地质与矿产》2010,(1):40-47

寒武系下统牛蹄塘组黑色岩系广泛分布于鄂西地区,层内现已发现众多的钼钒矿床(点),其形成条件具有热水沉积与正常海相沉积双重特征,成矿系统总体上处在海侵体系域陆棚盆地还原沉积环境,期间由区域性断裂构造的热水喷流提供多种金属元素来源,经炭质、粘土矿物吸附作用沉积成矿,其中Ni、Mo与喷流作用最为密切,钒与生物化学作用密切,具有较好的找矿远景。  相似文献   

四川盆地东部海相二叠系油苗的发现及其地质意义     

刘岩  钟宁宁  邵瑞奇  田永晶  朱雷  马永强 《海相油气地质》2010,15(1):44-50

在四川盆地东部古生界地层发现大量天然气资源,鲜有原油发现。重庆天府磨心坡煤矿下二叠统茅口组石灰岩上部地层裂隙发现沿层间裂隙随水渗出的黄绿色液态轻质油苗。研究表明:油苗碳数分布较窄,为C4~C26,具有明显的姥鲛烷优势,Pr/Ph值为1.64,δ13C值为-26.2‰;油苗所反映的成熟度较高,折算Ro约为1.6%,一维盆地模拟验证二叠系的热演化程度可达与之相当的热演化程度。综合研究认为油苗与二叠系煤系地层关系密切。油苗的发现表明,在四川盆地古生界整体高过成熟的大背景下,某些成熟度相对较低,保存条件适宜的区域仍有发现一些中小型油藏的可能,这对四川乃至南方古生界油气勘探具有一定的启示意义。  相似文献   

渤海湾西岸细砂质潮间带的成因分析   总被引：1，自引：1，他引：0  

裴艳东  田立柱  王福  王宏 《华北地质》2010,33(3)

根据在海河口南缘至独流减河岸段潮间带地区采集的36个表层和1个无扰动柱状沉积物样品的粒度分析结果,探讨了该岸段的粒度分布特征.结果表明:平面上(自南向北),该潮间带表层沉积物由粉砂质砂变为细砂,呈逐渐变粗、分选性变好的趋势;垂向上,潮间带表层45 cm以下主要为粉砂质砂和粘土质粉砂的互层沉积,向上,渐变为细砂或极细砂,显示向上变粗、分选性变好的趋势.这一向北、向上变粗、分选变好的总趋势,是近半个世纪以来因海河防潮闸的修建而使河流泥砂输运能力降低、近岸海洋影响增强的海河三角洲退化的现代过程的反映.  相似文献   

Hybrid anaerobic baffled reactor for treatment of desizing wastewater   总被引：3，自引：3，他引：0  

R. R. Liu  Q. Tian Ph.D.  B. Yang Ph.D.  J. H. Chen Ph.D. 《International Journal of Environmental Science and Technology》2010,7(1):111-118

Polyvinyl alcohol-containing desizing wastewater discharged within final textile wastewater has a great impact to the environment due to its poor biodegradability. An improved lab-scale hybrid anaerobic baffled reactor was developed to treat desizing wastewater. The modification was achieved by increasing the height of hybrid anaerobic baffled reactor and application of proper effluent recycle enabled to increase the ability of entrapping microbe-rich small particles in the reactor and prompted the formation of granules. The significant difficulty in hybrid anaerobic baffled reactor operation is the slow start-up procedure, which is crucial to the overall polyvinyl alcohol-containing desizing wastewater treatment. Therefore, the ability of a hybrid anaerobic baffled reactor, treating desizing wastewater, to achieve a prompt start-up was studied at lab-scale. Results showed that inoculated with anaerobic granular sludge and adoption of effluent recycle during start-up, the system demonstrated a good performance of polyvinyl alcohol removal efficiency (above 17.2 %) and satisfactory stability of pH and alkalinity in effluent (range around 7.4–8.0 and 700–920 mg/L, respectively) and the sludge appeared obviously granulation. Thus, the prompt start-up was achieved after 60 days. The start-up strategy used for this process has achieved its goals by creating an active microbial population. The improved lab-scale hybrid anaerobic baffled reactor proved to be an efficient reactor configuration for the treatment of desizing wastewater, which favored the prompt start-up of hybrid anaerobic baffled reactor. The results also provide evidence to modify the design of anaerobic baffled reactor to improve reactor performance.  相似文献   

Regional features of precipitation over Asia and summer extreme precipitation over Southeast Asia and their associations with atmospheric–oceanic conditions     

Cai Yao  Weihong Qian  Song Yang  Zhengmin Lin 《Meteorology and Atmospheric Physics》2010,106(1-2):57-73

The variations of both total and extreme precipitations over Asia are characterized by large regional features and seasonality. Extreme precipitation mainly occurs in summer and then in autumn over South Asia but it is a prominent phenomenon in all seasons over Southeast Asia. It explains above 40% of the total precipitation in winter over India, while the ratio of extreme precipitation to total precipitation is 30% or smaller in all seasons over southern-central China. Over Southeast Asia, the largest ratio appears in winter. The extreme precipitation over Southeast Asia (EPSEA) exhibits significant positive trends in all seasons except autumn. The long-term increase in summer EPSEA is associated with significant surface warming over extratropical Asia and the Indo-Pacific oceans and linked to a large-scale anomalous cyclonic pattern over Southeast Asia. An increase in de-trended summer EPSEA is associated with less significant surface warming. However, it is still clearly linked to an anomalous cyclonic pattern over Southeast Asia, contributed by intensifications of monsoon flow from the west, trade wind from the east, and cross-equatorial flow over Indonesia. The antecedent features of increased summer EPSEA include an overall warming over the tropical–subtropical northern hemisphere and an anomalous cyclonic pattern over Southeast Asia in winter and spring. When the large-scale Asian monsoon (measured by the Webster-Yang monsoon index) or the South Asian monsoon is strong, summer extreme precipitation mainly increases over tropical Asia. When monsoon is strong over Southeast Asia or East Asia, extreme precipitation increases over Southeast Asia and decreases over East Asia. A strong summer monsoon over Southeast Asia or East Asia is also followed by decreased autumn extreme precipitation over Southeast Asia.  相似文献   

成武县节约集约用地破解用地难题     

张志胜  刘统亮  田国强 《山东国土资源》2007,23(6):2007/5/10-2007/6/13

成武县土地总面积988．21km^2，总人口63万，耕地面积70683．72hm^2，近年来，随着招商引资力度的加大，土地需求量直线上升，土地供需矛盾日益突出。为此，成武县国土资源局党组多次召开会议进行研究，加强政策学习，不断更新用地观念，科学决策，着力盘活存量，内涵挖潜，走节约集约用地之路，努力寻找破解制约经济发展“瓶颈”的良策妙方，积极拓宽经济发展空间，保障了建设用地需求，走出了一条节约、集约用地，促进经济发展的新路子。  相似文献