岩浆溶离型Cu—Ni硫化物矿床元素组合和地球化学评价指标   总被引：7，自引：3，他引：7  

刘崇民  李应桂 《地质与勘探》2001,37(5):6-9

铜镍矿床的地球化学勘查评价实质上是基性－超基性岩体含矿性的评价。岩浆铜镍硫化物矿床与基性、超基性岩体具有空间和成因联系，其主要成晕微量元素以Cu、Ni、Co、Cr、Ag为主，而且含矿岩体的这些元素的平均值高、离差大。矿床区域地球化学异常发育，异常的分布受基性－超基性岩岩群和岩带制约，异常浓集中心与矿田的岩矿体一致。矿区异常继承了区域异常的组分，异常的高值区与矿床对应。矿床的原生晕具有组分分带，前缘元素是I、F、B、Ba、As、Mo；近矿元素是Ag、Cr；矿元素是Cu、Ni、Co。利用原生晕的组分分带特征可判断矿体的剥蚀程度和预测隐伏的岩矿体。  相似文献   

Effects of chlorpyrifos on the endogenous rhythm of the Manila clam, Ruditapes philippinarum (Bivalvia: Veneridae)     

Kim WS  Yoon SJ  Yang DB 《Marine pollution bulletin》2004,48(1-2):182-187

  相似文献   

综合方法寻找矿山深部隐伏矿的一个成功实例   总被引：1，自引：0，他引：1  

黄力军  刘瑞德  陆桂福  姚敬金  刘崇民 《地质与勘探》2004,40(Z1):70-73

介绍甘肃白银有色金属公司小铁山矿深部找矿实例,讨论地质、化探、重力和可控源音频大地电磁测深在深部找矿中的作用.  相似文献   

冲积平原区土壤中稀土元素分布模式及其示踪作用     

马生明  朱立新  王之峰  刘崇民  胡树起 《物探与化探》2006,30(2):100-103

根据科研生产工作的实际需要,借鉴稀土元素分布模式示踪物源的方法,对冲积平原景观区土壤中稀土元素的分布模式进行了系统研究。结果发现冲积平原区土壤中稀土元素分布模式总体规律大同小异,表明冲积平原区成壤母质特性基本相同。利用稀土元素分布模式的细微差异能够有效判别成壤母质特性的变化。  相似文献   

乌岙铅锌矿床地球化学特征及其成因的讨论     

徐外生  刘崇民  周俊法  方原勤 《物探与化探》1987,11(6):443-455

本文借助于多种测试分析资料,在充分地研究矿区与成矿作用有关的岩石、矿石和矿物等地球化学特征的基础上,利用已获的研究成果,有说服力地进行了对比总结.尝试应用地球化学资料,讨论了矿床形成的矿质来源、控矿因素,以及沉淀富集条件等.指出该矿床应属岩浆热液型铅锌矿床.  相似文献   

A survey of census bureau population projection methods     

Long JF  Mcmillen DB 《Climatic change》1987,11(1-2):141-177

Population projections methods of the U.S. Census Bureau draw upon several different traditions of forecasting: demographic accounting, judgmental, time series, deterministic, and explanatory. This paper reviews each of the forecasting traditions in population projections, describes the U.S. Census Bureau's current methods for national and state population projections, and proposes new hybrid approaches such as demographic-time series methods for national fertility projections and economic-demographic methods for state migration projections. Throughout the article, possible parallels with forecasting in other disciplines are noted.  相似文献   

不同景观区的岩石地球化学勘查方法研究   总被引：4，自引：2，他引：4  

刘崇民  李应桂  史长义 《物探与化探》2002,26(1):23-26

通过不同景观区岩石测量方法技术研究,提出了以岩屑测量、构造岩石地球化学测量、脉岩地球化学测量和面型岩石地球化学为主体的岩石地球化学测量技术方法系统。在森林覆盖区和风成沙干扰区以及残山戈壁区等浅覆盖区域可采用岩屑测量圈定矿化地段;在岩石裸露区和已开采的矿山采用构造岩石裂隙测量和脉岩测量追踪深部盲矿;面型岩石测量以一定面积的网格采集单元组合样,其具有样品采集和分析数量少、获取信息量大、可圈定不同尺度的找矿靶区的优点。  相似文献   

Critical tissue copper residues for marine bivalve (Mytilus galloprovincialis) and echinoderm (Strongylocentrotus purpuratus) embryonic development: conceptual, regulatory and environmental implications     

Rosen G  Rivera-Duarte I  Chadwick DB  Ryan A  Santore RC  Paquin PR 《Marine environmental research》2008,66(3):327-336

Critical tissue copper (Cu) residues associated with adverse effects on embryo-larval development were determined for the Mediterranean mussel (Mytilus galloprovincialis) and purple sea urchin (Strongylocentrotus purpuratus) following laboratory exposure to Cu-spiked seawater collected from San Diego Bay, California, USA. Whole body no-observed-effect-residues (NOER) were similar, with means of 21 and 23mugg(-1)dw, for M. galloprovincialis and S. purpuratus, respectively. Mean whole body median effect residues (ER50) were 49 and 142mugg(-1)dw for M. galloprovincialis and S. purpuratus, respectively. The difference in ER50s between species was reduced to a factor of <2 when expressed as soft tissue residues. Coefficients of variation among whole body-ER50s were 3-fold lower than median waterborne effect concentrations (EC50) for both species exposed to samples varying in water quality characteristics. This suggests that tissue concentrations were a better predictor of toxicity than water concentrations. The CBRs described herein do not differentiate between the internal Cu concentrations that are metabolically available and those that are accumulated and then detoxified. They do appear, however, to be well enough related to the level of accumulation at the site of action of toxicity that they serve as useful surrogates for the copper concentration that affects embryonic development of the species tested. Results presented have potentially important implications for a variety of monitoring and assessment strategies. These include regulatory approaches for deriving saltwater ambient water quality criteria for Cu, contributions towards the development of a saltwater biotic ligand model, the conceptual approach of using CBRs, and ecological risk assessment.  相似文献   

西藏玉龙斑岩铜钼矿床区域地球化学异常特征和找矿标志   总被引：2，自引：0，他引：2  

刘占元  史长义  刘崇民 《物探化探计算技术》2007,(Z1)

研究了西藏玉龙斑岩铜矿矿床的区域地球化学特征,结合地质条件综合分析了区域地球化学异常分布规律与矿床的关系,提出了地质、地球化学找矿标志。这对玉龙成矿带进一步勘查找矿有一定的意义。  相似文献   

Comparison of benthic invertebrate assemblages at Spartina alterniflora marshes reestablished after an oil spill and existing marshes in the Arthur Kill (NY/NJ)     

Vitaliano JJ  Reid RN  Frame AB  Packer DB  Arlen L  Sacco JN 《Marine pollution bulletin》2002,44(10):1100-1108

In January 1990, an oil spill damaged salt marshes along the banks of the Arthur Kill (New York and New Jersey, USA). In the years following the spill, Spartina alterniflora seedlings were planted at a number of the oil damaged sites and successfully reestablished at these sites. In 1996, the National Marine Fisheries Service began a study to compare the benthic invertebrate assemblages at the reestablished S. alterniflora marshes to those at nearby existing marshes in the Arthur Kill. Oligochaetes, nematodes, and the small tube-building polychaete, Manayunkia aestuarina were the dominant taxa in the study. Significant differences were found in the abundances of all invertebrate individuals, oligochaetes, and nematodes between the September and May sampling times but not between reestablished and existing marshes. Although benthic invertebrate community structure was similar at reestablished and existing marshes three to four years after planting, the functional similarity of these marshes was not assessed in this study.  相似文献