矿物锌肥结构特征及其增效机理研究   总被引：3，自引：0，他引：3  

吴平霄廖宗文  毛小云 《岩石矿物学杂志》2001,20(4):449-454

采用阳离子交换法制备矿物锌肥.蒙脱石和蛭石对Zn2+的等温吸附线呈双"S"型,而沸石对Zn2+的等温吸附线则呈"Langmuir"型.3种矿物对Zn2+的吸附容量大小顺序为蒙脱石＞蛭石＞沸石.盆栽试验结果显示,施用锌肥后,两造玉米幼苗的生物产量都高于CK(未施用锌肥),在第一造中蛭石锌的增产量最高,而第二造中蒙脱石锌的增产量最高.运用粉晶X射线衍射、红外光谱、差热及热重分析等技术对矿物及矿物锌肥的结构特征进行了研究,结果表明,蛭石锌可作为速效锌肥,而蒙脱石锌则可作为长效缓释锌肥.  相似文献   

岩石中硼的提取分离及同位素组成的测定   总被引：4，自引：1，他引：3  

王刚  肖应凯 《岩矿测试》2000,19(3):169-172

介绍了一种用Ｎａ２ＣＯ３＋Ｋ２ＣＯ３混合熔剂对石样品进行分解,用硼特效树脂和阴、阳混合离子交换树脂相结合进行岩石样品中硼的纯化分离的方法。采用该方法从岩石样品中提取、分离出来的硼能满足硼同位素质谱法测定的需要,不产生硼同位素分馏,硼同位素测定精度大多优于０．０５％。  相似文献   

新的机遇,新的挑战--关于"十五"工作的设想   总被引：1，自引：1，他引：0  

王椿镛  吴忠良  陈运泰 《国际地震动态》2000,(5):1-4

地震科学经历近百年的发展,现已步入中年.文章介绍针对地震科学当前面临的主要问题,IASPEI采取的措施和努力的方向,其中强调了宽频带数字地震观测在地震研究中的作用.这些背景值得我们在编制"十五"规划时借鉴.  相似文献   

Long-term Circulation and Eutrophication Model for Tolo Harbour,Hong Kong   总被引：1，自引：0，他引：1  

Arega  Feleke  Lee  Joseph H.W. 《Water Quality and Ecosystems Modeling》2000,1(1-4):169-192

Since the early 1980s excessive discharges of organic waste into Tolo Harbour have created serious problems through nutrient enrichment. A number of eutrophication related problems have been reported which incurred financial losses of billions of dollars and serious ecological imbalance. This work addresses the development, verification and application of a water quality model to synthesize the available large database of water quality and to study water quality management issues of Tolo Harbour. Since detrimental water quality problems usually occur during summer when there is stratification and the water temperature is high, the tidally-averaged hydrodynamics and the relative contribution of gravitational circulation and tidal exchanges in Tolo Harbour have been studied. Gravitational circulation is found to be the dominant mixing process for most of the year, accounting for 70 percent of the mixing. A simple and tractable predictive two-layer mass transport and diagenetic dynamic eutrophication model has been developed. The model computes daily variation of key water quality variables in the water column: algal biomass, dissolved oxygen, organic-nitrogen, ammonium-nitrogen, nitrate-nitrogen, and carboneous oxygen demand. In addition, to study the response and impact of the seabed to the overall eutrophication process a sediment sub-model is developed. The diagenetic sediment sub-model computes explicitly the amount of nutrient recycled and the sediment oxygen demand exerted on the water column. The calibrated model has been validated against a 20 year water quality data base under a wide range of hydro-meteorological and environmental conditions. Both spatial and seasonal variation of observed water quality variables are reproduced. The verified model shows that a significant reduction of total nitrogen loading would be required to meet the water quality objectives, with a recovery time of three months for water column and more than two years for sediment.  相似文献   

地震数据数字化及实时传输     

彭伟荣  闵祥仪  张幼敏  常千军  王斌  尹志文  张昱  李发科 《地震工程学报》1996,18(1):52-55

简要地介绍了地震数据国际交换试验系统和台站地震数据实时采集传输系统的组成、各部分的特性与功能、地震数据数字化及实时传输过程。  相似文献   

新疆阿尔泰阿拉尔花岗岩多维矿物相-水氧同位素交换反应动力学   总被引：6，自引：0，他引：6  

刘伟  贺伯初  陈振胜 《地质学报》1996,70(2):129-141,T001

新疆阿尔泰阿拉尔花岗岩中共生石英、长石、黑云母的δ~(18)O值具有宽广的变化范围,3者表现出显著的~(18)O/~(16)O不平衡关系,尤其是石英、长石具有倒转△~(18)O_(石英-长石)关系(△~(18)O_(石英-长石)<0)。上述关系清楚地表明在花岗岩-水之间发生了~(18)O/~(16)O交换反应。根据质量平衡约束关系对岩石与外来流体的初始δ~(18)O值作了估计。由于花岗岩的初始δ~(18)O值被大大地改变了,简单运用全岩或者单矿物样品的δ~(18)O值判断岩浆来源的方法是不可靠的。水-岩之间的~(18)O/~(16)O交换反应并不伴随着岩石矿物学上的强烈蚀变效应,这种脱藕关系暗示着交换反应发生于较高温度即岩浆次固相-岩浆期后冷凝过程中。交换机制主要为扩散控制。定量模拟表明:阿拉尔岩体具有高流体流动速率(3×10~(-14)mol/s)、长水-岩反应时限(0.8-6Ma)、高水/岩值(0.79-6.14)。在造山带岩浆弧环境的中部地壳层次下,变质流体流动和环流是非常强烈的。  相似文献   

Oxygen Isotope Exchange Kinetics Between Coexisting Minerals and Water in the Aral Granite Pliiton of the Altay Mountains,Northern Xinjiang     

Liu Wei  He Baichu  Chen Zhensheng 《《地质学报》英文版》1996,9(4):366-379

Abstract Coexisting quartz, feldspar and biotite vary widely in their δ¹⁸O values and display a remarkable ¹⁸O / ¹⁶O disequilibrium relation; especially, a quartz–feldspar reversal (Δ ¹⁸O_{Quartz?feldspar}<0) exsists in the Aral granite pluton of the Altay Mountains, northern Xinjiang. The ¹⁸O / ¹⁶O exchange reaction definitely occurred between granite and water. Initial δ¹⁸O values of the granite and exotic fluid are evaluated by the mass balance consideration. The conventional method of discrimination between various magma derivations simply with δ¹⁸O values of either whole rock or separate minerals is misleading and unreliable. Experiments carried out by the authors show that the ¹⁸O / ¹⁶O exchange reaction is not accompanied by what geologists describe as petrological and mineralogical alteration effect. This decoupling relation implies that exchange reaction occurs at a relatively high temperature during subsolidus–postmagmatic cooling of magmas. The exchange mechanism is mainly diffusion–controlled. It is demonstrated through quantitative modelling that the hydrothermal system associated with the Aral pluton is long–lived (0.8—6 Ma), with a relatively high fluid flow rate (3 x 10^?14 mol. s^?1) and high W/ R ratio (0.79-6.14). This means that an intense flow and convection may exist at the midcrustal level of orogenic magmatic arcs.  相似文献   

矿物氧扩散与氧同位素退化交换作用   总被引：2，自引：0，他引：2  

傅斌  汪学军 《高校地质学报》1995,1(1):67-69

本文从理论上解论上解析了同位素封闭体系内的矿物氧扩散性质，火成岩从冷却为质岩从高峰变质温度冷却过程中的所发生的扩散作用会层致矿物晶体内部及晶粒间的氧同位素重新分配，两种不同的矿物氧扩散－同位素交换模式都可以用来模拟这种性质。实例研究进一步阐明了扩散对氧同位素组成的影响。  相似文献   

初论矿产资源资产评估          下载免费PDF全文

李万亭  田入金 《地球科学》1995,20(2):138-143

以马克思的地租理论和现代资产评估理论及方法为基础，初步建立了矿产资源资产评估理论和方法，并以金矿资源为例，对其进行了应用。  相似文献   

焦家式金矿水-岩交换作用——蚀变岩石氢氧同位素组成研究   总被引：8，自引：0，他引：8  

张理刚  陈振胜  刘敬秀  于桂香  王炳成  徐金方  郑文深 《矿床地质》1995,14(3):261-272

焦家式台上蚀变岩型金矿地表及浅部绢英岩δ18O值平均在12.5‰，δD值在- 75‰，分别比新鲜原岩花岗闪长岩高出2‰~3‰和20‰。垂向1000 m以下，即沿矿体倾斜方向1500 m以下，绢英岩的δ18O和δD值分别降低为+8‰和-95‰左右，显示出比原岩亏损18O，但是D含量几乎不变。相应地，石英和绢云母蚀变矿物对的δ18O值分别从14‰和12‰左右，降为深部的11‰和9‰左右。综合资料表明，成矿流体是由大气降水与深部中基性岩呈面型淋滤相互作用，温度为350～400℃，有效W/R比为0.001左右时形成的演化大气降水含矿储体热液，随之上升进入破碎带充填呈线型扩散水/岩相互作用，有效W/R比超过5.0，降温的缓冲开放体系中矿化沉积。  相似文献