A preliminary study on the distribution and genesis of underground brine in the littoral plain of Laizhou Bay in the Bohai Sea   总被引：3，自引：1，他引：2  

韩有松  孟广兰  王少青 《中国海洋湖沼学报》1993,11(1):46-56

Quaternary underground brine in the littoral plain region of the Bohai coast is new type littoral facies evaporation ore deposit in liquid state . This model of " littorally- forming brine " is based on study of the distribution, depositional environment, forming / storing process, and genesis of underground brine in the coast of Laizhou Bay . Essential conditions for genesis of brine are arid and semiarid climate , abundant sources of ancient seawater, and geological and geomorphological environment of wide tidal beach along a coast. The process of underground brine genesis may be : seawater/tidal beach-evaporation and concentration-seeping and accumulation- brine/tidal beach - burial (evolution of the sea- land )- underground brine .Underground brine is characterized by high content of chemical elements, shallow burial depth and easy exploitation . The process of extracting salt from underground brine present in the tidal flat is incomparably superior to that of producing salt from seawater, and has b  相似文献   

Historical changes in heavy metals in the Yangtze Estuary, China   总被引：1，自引：0，他引：1  

Meng Yang  Ray Kostaschuk  Zhongyuan Chen 《Environmental Geology》2004,46(6-7):857-864

A 6-m-long core was used to examine historical changes in heavy metals on tidal flats in the Yangtze Estuary, China. Over the last 100 years, human impact was minimal. However, over the last few decades, vertical metal concentrations have been affected by human activities such as local industrialization, urbanization and construction of major sewage outlets. Copper, lead and arsenic were identified as contaminants in the Yangtze Estuary on the basis of national pollution standards and a comparison of metals in the upper core with those in the lower core.  相似文献   

Mianlüe tectonic zone and Mianlüe suture zone on southern margin of Qinling-Dabie orogenic belt     

ZHANG Guowei  Dong Yunpeng  Lai Shaocong  GUO anlin  Meng Qingren  Liu Shaofeng  CHENG Shunyou  Yao Anping  ZHANG Zongqing  PEI Xianzhi  Li Sanzhong 《中国科学D辑(英文版)》2004,47(4)

The Mianlue tectonic zone (Mianlue zone), an ancient suture zone in addition to theShangdan suture in the Qinling-Dabie orogenic belt, marks an important tectonic division geo-logically separating north from south and connecting east with west in China continent. To de-termine present structural geometry and kinematics in the Mianlue tectonic zone and to recon-struct the formation and evolution history involving plate subduction and collision in theQinling-Dabie orogenic belt, through a multidisciplinary study, are significant for exploring themountain-building orogenesis of the central orogenic system and the entire process of the majorChinese continental amalgamation during the Indosinian.  相似文献   

北山—阿拉善地区白垩纪、侏罗纪盆地叠合特征   总被引：3，自引：0，他引：3  

郑孟林  李明杰  曹春潮  张军勇 《大地构造与成矿学》2003,27(4):384-389

研究区发育侏罗纪盆地和白垩纪盆地,侏罗纪盆地受近东西向断裂的控制,为东西向展布的断陷湖盆。白垩纪盆地受北东向断裂的控制,为北东向展布的断陷湖盆,经历早白垩世的伸展断陷及其以后的后期改造阶段。两大世代的盆地在空间上存在翘倾叠合、叠合保存、部分叠合改造等三种方式。盆地的叠合保存对侏罗系烃源岩的油气形成最为有利。  相似文献   

测震学信息增益合成方法及其在地震预报中的应用     

孟保成  王志铄  张亚琳  苏莉华  陈琴 《地震研究》2003,26(1):43-49

提出了一种地震预报的新方法，并应用于地震的地点预测。震例的空间扫描异常区的对比表明，该方法比单项地震预报方法圈出的异常区不仅范围小，而且包围或接近震中。  相似文献   

超高压变质岩中柯石英→石英相变研究的进展   总被引：1，自引：0，他引：1  

龙卧云  孟大维 《世界地质》2003,22(3):252-257

柯石英是石英的高压同质多相变体，是超高压变质作用的产物，它是识别超高压变质作用的重要标志矿物。柯石英的发现表明了近地表的岩石随板块运动曾被俯冲至地下大于90km的深度并经受了超高压变质作用。研究柯石英→石英相变过程中的微结构变化，对进一步研究超高压变质作用的机理及超高压变质岩折返过程的动力学机制具有重要意义。本文简述了近年来有关超高压变质岩中柯石英→石英相变研究的一些进展。  相似文献   

低产低渗裂缝油田吞吐采油试验研究     

田梦  林海  孙跃武  徐衍彬  高平 《世界地质》2003,22(3):279-283

头台油田是构造—岩性油藏。裂缝型、特低渗透是其显著特点，常规注水开发后经常出现严重的油井水淹，造成油田开发低效。本文以头台油田研究为例，认为对于裂缝型特低渗透油田，采用注水吞吐采油技术，通过套管直接向地层注水，利用储层毛管力作用，进行油水置换，实现单井自注自采吞吐采油，可以改善油田开发效果，减缓产量递减。适合注水吞吐采油基本条件是岩石润湿性为弱亲水和岩石饱和非润湿相。影响注水吞吐采油效果的主要因素是储层吸水状况、微缝发育状况、储层非均质性、注入体积和关井压力等。吞吐采油技术可作为改善裂缝型特低渗透油藏开发效果的一种新的模式来研究和推广。  相似文献   

Utilization of fly ash for stabilization/solidification of heavy metal contaminated soils   总被引：19，自引：0，他引：19  

Dimitris Dermatas  Xiaoguang Meng 《Engineering Geology》2003,70(3-4):377-394

Pozzolanic-based stabilization/solidification (S/S) is an effective, yet economic remediation technology to immobilize heavy metals in contaminated soils and sludges. In the present study, fly ash waste materials were used along with quicklime (CaO) to immobilize lead, trivalent and hexavalent chromium present in artificially contaminated clayey sand soils. The degree of heavy metal immobilization was evaluated using the Toxicity Characteristic Leaching Procedure (TCLP) as well as controlled extraction experiments. These leaching test results along with X-ray diffraction (XRD), scanning electron microscope and energy dispersive X-ray (SEM–EDX) analyses were also implemented to elucidate the mechanisms responsible for immobilization of the heavy metals under study. Finally, the reusability of the stabilized waste forms in construction applications was also investigated by performing unconfined compressive strength and swell tests. The experimental results suggest that the controlling mechanism for both lead and hexavalent chromium immobilization is surface adsorption, whereas for trivalent chromium it is hydroxide precipitation. Addition of quicklime and fly ash to the contaminated soils effectively reduced heavy metal leachability well below the nonhazardous regulatory limits. Overall, fly ash addition increases the immobilization pH region for all heavy metals tested, and significantly improves the stress-strain properties of the treated solids, thus allowing their reuse as readily available construction materials. The only potential problem associated with this quicklime–fly ash treatment is the excessive formation of the pozzolanic product ettringite in the presence of sulfates. Ettringite, when brought in contact with water, may cause significant swelling and subsequent deterioration of the stabilized matrix. Addition of minimum amounts of barium hydroxide was shown to effectively eliminate ettringite formation. Overall, due to the presence of very high levels of heavy metal contamination along with sulfates in the solid matrices under study, the results presented herein can be applied to the management of incinerator and coal fly ash, boiler slag and flue gas desulfurization wastes.  相似文献   

冬小麦田咸水灌溉与土壤盐分调控试验   总被引：6，自引：0，他引：6  

郭会荣  靳孟贵  高云福 《地质科技情报》2002,21(1):61-65

利用浅层咸水灌溉，可使浅层咸水分布区无效降水转化为有效水资源，缓解北方水资源紧缺的矛盾；通过王瞳试验场进行的咸水灌溉与土壤盐分调控试验表明，利用3g/L左右的微咸水连续灌溉5a，根层土壤溶液浓度未超过小麦的耐盐能力，且作物增产；多年盐分变化趋势为：1994－1997年1m深度内土壤总含盐量在一定范围内波动，总体变化不大，连续干旱的1997－1998年略呈上升趋势；麦秸覆盖和施有机肥能减少根层土壤盐分，对土壤盐分具有有利的调控作用，具有增产效果。  相似文献   

高温高压处理钻石的谱学研究   总被引：3，自引：3，他引：3  

苑执中  彭明生  蒙宇飞 《矿物学报》2002,22(4):379-382

对高温高压处理钻石进行了显微观察及红外光谱、低温紫外－可见－近红外吸收光谱和光致发光谱等谱学研究，认为钻石的去色是由于高温高压过程引起晶格结构的重组，从而得出天然褐色钻石的致色与位错附近的孤氮－空穴（N－V）的眯缺陷有关的结论。同时也提供了高温高压处理钻石的一些谱学特征，如红外光谱中较弱的3107cm^-1峰，紫外－可见吸收光谱中的325nm宽带，光致发光谱中的575nm与637nm峰。  相似文献