华北地区部分井孔稀有气体异常研究   总被引：2，自引：0，他引：2       下载免费PDF全文

张培仁  刘成龙  王志敏  陶京玲  杨海祥  杨竹转  孟彩菊 《地震地质》2002,24(2):215-222

介绍了近年来华北地区宝龙等 3口井稀有气体的显著异常 ,并据其特征与井孔水位动态的关系 ,对稀有气体异常的成因进行了理论分析与实验研究。结果表明 ,水位下降 10 0mm ,岩层孔隙、裂隙中的气体体积膨胀 0 0 0 90 % (气体体积百分比 ,下同 )左右。由于地下水位大幅度下降 ,岩层孔隙压力减小 ,积聚在岩层孔隙、裂隙中的气体体积膨胀溢出 ,导致井孔地下水中稀有气体含量出现异常变化。这些异常是干扰因素所致 ,不是地震异  相似文献   

海南省五指山土壤中的重金属元素含量   总被引：6，自引：0，他引：6  

廖金凤 《山地学报》2003,21(2):169-172

海南省地处热带地区，山地面积占25．4％，五指山是海南山地的核心，也是海南最高峰，从下而上依次分布着砖红壤、赤红壤、黄壤、灌丛草甸土。五指山土壤普遍遍缺，而Zn、Ni、Pb、Cd、Cr、Co含量属正常值。在成土过程中，Cd有一定积累，其他元素有明显淋溶。在自下而上的垂直带谱中，Zn、Co含量呈现递减，Cd则相反，Ni、Pb、Cu、Cr含量呈现波浪式变化。气候因素是影响五指山土壤重金属元素含量及分布的主导因素。  相似文献   

Sensitivity Analysis of a Feedforward Neural Network for Considering Genetic Mechanisms of Kuroko Deposits     

Matsuda  Setsuro  Koike  Katsuaki 《Natural Resources Research》2003,12(4):291-301

Exploration for volcanogenic massive sulfide deposits of the kuroko-type is underway in many places. Clarifying the spatial patterns of the metals in kuroko deposits will be useful for understanding their genetic mechanisms and for future exploration of such types of deposits. This study represents a spatial distribution analysis on the contents of principal metals of kuroko deposits: Cu, Pb, and Zn, in the Hokuroku district, northern Japan, by a feedforward neural network and 1917 sample data at 143 drillhole sites. The network, which consists of three layers, was trained by the principle of SLANS in which the numbers of neurons in the middle layer and training data are changed to improve estimation accuracy. Using the weight coefficients connecting adjacent neurons, sensitivity analysis of the neural network was carried out to identify factors influencing spatial distributions of the three metals. The coordinates depth (z) direction, Bouguer gravity, and specific lithology such as dacite were determined to be influencing factors. The high frequency of the z coordinate signifies that the metal contents differ to a large extent by depth. The sensitivity vector was defined using sensitivity coefficients for x, y, and z coordinates of an estimation point. We determined that the directions of large vectors were different inside and outside of the Hanawa-Ohdate area. This characteristic is considered to originate from the differences in the permeability of fractures that became the paths for rising ore solutions, and the depths that the solutions mixed with sea water.  相似文献   

某地平板玻璃原料用石英砂的提纯研究     

彭光菊  黄永平  张石林  莫伟泉  黄松 《矿产与地质》2003,17(1):24-26

某地石英矿砂通过磁选分离法、稀酸浸泡法处理后，矿砂不同程度地降低了铁、铝、钙镁的含量；采用磁选分离 稀酸浸泡法联合处理后，使该地石英砂的化学成分达到了优质的生产平板玻璃用硅质原料的国家标准。  相似文献   

广东大亚湾底质重金属分布特征与环境质量评价   总被引：13，自引：0，他引：13       下载免费PDF全文

李学杰 《中国地质》2003,30(4):429-435

大亚湾是粤东的大型海湾，毗邻深港，其环境质量现状及发展趋势颇受关注。对大亚湾海域45个表层站位、1口浅钻及2个柱状样重金属元素Hg、As、Cd、Cu、Pb、Cr、Zn进行分析，并对底质环境质量进行定量评价。其结果：①大亚湾海域Hg、As、Cu的污染指数Pi值均小于1．0，超标率为0，表明全区未受这些因子污染；②Cd、Zn、Pb、Cr的污染指数Pi值部分大于1．0，表明受到这些因子不同程度的污染，其中Pb的超标率最高，达93．3％，污染指数Pi值为0．83～2．25，为良好—中等污染，总体为轻微污染；Zn的超标率为76．9％，pf值为0．25～2．63，变化较大，总体为轻微污染；Cd的超标率为60．0％，Pi值为0．50～1．78，良好—轻微污染；Cr的超标率为17．8％，Pi值为0，49～1．90，良好—轻微污染；③综合污染指数为1．08～2．21，平均1．37，表明本区均不同程度地受重金属污染，总体属轻微污染，其中范和港污染最为严重，SQI值多在1．5以上，其次为中央列岛附近海域。湾口和澳头—霞涌近岸海域污染较轻。从钻孔及柱状样的重金属含量分布来看，在表层没有明显增多的趋势。  相似文献   

金属腐蚀探测   总被引：2，自引：0，他引：2  

张守本 《铀矿地质》2003,19(2):114-118

本阐述了金属腐蚀的危害性和金属管道腐蚀探测的迫切性，并介绍了几种具有探测腐蚀功能的物探方法。  相似文献   

被污染土壤的植物修复研究   总被引：11，自引：1，他引：11  

周国华 《物探与化探》2003,27(6):473-475,489

植物修复是利用植物吸收、降解、挥发、根滤、稳定、泵吸等作用机理,达到去除土壤、水体中污染物,或使污染物固定以减轻其危害性,或使污染物转化为毒性较低化学形态的现场治理技术.植物修复对于重金属污染土壤的治理修复具有重要意义.已有研究在累积与超累积植物的寻找筛选、植物对重金属等有害物的耐毒和解毒机理、植物修复现场环境调控及根际处理技术等方面取得了大量成果.现代分子生物学、基因工程技术发展有可能使植物修复技术取得重大突破.  相似文献   

Synthesis of zeolites using fly ash and their application in removing heavy metals from waters   总被引：1，自引：0，他引：1  

王焰新  郭永龙  杨志华  蔡鹤生  Xavier Querol 《中国科学D辑(英文版)》2003,46(9):967-976

Fly ash is the solid waste of thermal power plants where coal is used as fuel, and its management and utilization have been of environmental concern for decades. Since the technique of synthesizing zeolite from coal fly ash was introduced by Holler[1] (19…  相似文献   

鲁东官山榴辉岩与围岩接触关系的新发现及其对年代学的启示   总被引：14，自引：2，他引：14       下载免费PDF全文

宋明春  金振民  王来明  张希道  李远友 《地质学报》2003,77(2):238-244

鲁东官山榴辉岩呈透镜状包于变质含霓石碱性花岗岩中,榴辉岩的片麻理与主岩片麻理总体呈交切关系,局部可见变质含霓石碱性花岗岩呈细小岩枝状脉贯入榴辉岩中。变质含霓石碱性花岗岩锆石U-Pb法下交点年龄为231±25 Ma,上交点年龄为818±66 Ma。发现了闪长玢岩脉斜切式侵入榴辉岩及变质含霓石碱性花岗岩的接触关系,且闪长玢岩脉中有榴辉岩捕虏体,这种现象指示:闪长玢岩侵位时榴辉岩已折返至地壳较浅部位。研究表明,榴辉岩与变质含霓石碱性花岗岩共同经历了新元古代的超高压变质作用,但变质作用发生时含霓石碱性花岗岩可能处于熔融状态,榴辉岩是其中的固相包体。  相似文献   

Anomalous Gadolinium,Cerium, and Yttrium Contents in the Adige and Isarco River Waters and in the Water of Their Tributaries (Provinces Trento and Bolzano/Bozen,NE Italy)     

Peter Mller  Giulio Morteani  Peter Dulski 《洁净——土壤、空气、水》2003,31(3):225-239

Rare earth patterns of surface and groundwaters near big cities often show anthropogenic Gd (Gd_ant) anomalies in addition to geogenic Ce and Y anomalies. The Gd_ant anomaly is caused by very stable organic complexes, one of which is gadopentetic acid, Gd‐DTPA. Derivatives of this and similar compounds are used as contrast agents in magnetic resonance imaging (MRI) of the human blood system. The organic Gd complexes are stable enough to pass nearly unaffected through sewage treatment plants and are, thereafter, discharged into surface water systems. Water of the rapidly flowing Isarco/Eisack and Adige/Etsch rivers (Provinces of Trento and Bolzano/Bozen, NE Italy) and their tributaries show remarkable variations in anthropogenic Gd contents (Gd_ant). Low Gd_ant values are found on Monday and Tuesday, whereas high values are observed during the remaining weekdays. Reliable Gd_ant balances are calculated for the river system at the confluence of the Adige and its tributaries. At two places local decrease of Gd_ant indicates exfiltration of groundwater. It is demonstrated that Gd_ant can be used as a reliably conservative tracer to study the water budget in rapidly flowing alpine river systems. The studied different river waters show considerable negative Ce and positive Y anomalies. Negative Ce anomalies are caused by scavenging of Ce(III) by FeO(OH) precipitates and subsequent oxidation to CeO₂. Y anomalies are attributed to less sorption of Y than REE onto particulate matter. Thus, Y moves faster than REE. Both, Ce and Y anomalies, are of geogenic origin.  相似文献