湘南多金属矿成矿特征,成矿模式和找矿模式的建立及其应用     

练志强 《矿产与地质》1992,6(1):9-18

本文系《七五》国家重点攻关项目中三级专题湘南锡铅锌多金属隐伏矿预测研究的部分成果。在系统研究多金属成矿地质环境后,从解剖重点矿田、矿床入手,研究区内成矿规律,分析两类(同熔、重熔)岩浆的同熔、重熔、分异演化机制和沉积成岩机理与成矿的内在联系,探讨物质来源,成矿溶液性质和矿床成因,进而划分出同熔岩浆、重熔岩浆和层控等三大成矿系列,并依据成矿方式、围岩蚀变、矿物组合、矿体产状等细分出22个矿化类型(亚类),建立了成矿模式。依据成矿与地质环境的关系及矿床分带特征,总结了寻找隐伏矿床的找矿模式(标志)和找矿系统,并进行了成矿预测。  相似文献   

小兴安岭南坡土壤动物生态序列研究   总被引：3，自引：0，他引：3  

侯威岭  仲伟艳 《地理科学》1999,19(6):559-564

对小兴安岭南坡的土壤动物进行了生态序列研究。按等高差系列共选８个样地,分属不同植被类型,对各样地土壤动物调查分析结果表明：在生态序列诸环境因子中,海拔高度是主导因子;土壤动物类群和个体数量大致随海拔高度的增加而增加,这与一般情况相反,乃因取样区特殊的小气候所致;云冷杉林土壤动物类群和个体数量都比其它群落少。  相似文献   

Wavelet-Aggregated Signal in Earthquake Prediction     

A.A.Lyubushin Jr 《中国地震研究》1999,(1)

The concept of aggregated signal is introduced. Quantitatively, an aggregated signal can be defined as the scalar signal: it accumulates in its own variations only those spectral components that are presented simultaneously in each scalar time series of the multidimensional signal to be analyzed. Moreover, an algorithm of aggregation is proposed to suppress the spectral components that are present in any of the scalar components but absent in others (these components can be called local disturbance signals, for instance of technogenic nature). The main purpose of constructing the aggregated signal is to make clearer the common tendency of low-frequency data-flow in geophysical networks, which indicates an increase in collective behavior.It is known that almost all models of the process of earthquake preparation have pointed out an increase in collective behavior of components of geophysical fields in the region of preparation when the coming geocatastrophe has entered its long- and mid-term stages. Long  相似文献   

A long-term series of zooplankton monitoring of a shallow coastal water of the southern Baltic     

Reinhard Heerkloss  Werner Schnese 《Limnologica》1999,29(3):317

Data on the seasonal variability of the quality and quantity of zooplankton are presented for the shallow eutrophic Darss-Zingst estuary. These data are the result of a monitoring programm from 1969–1995. Copepods and rotifers were the main components of the biomass. They showed a pattern of seasonal fluctuation which remained unchanged during the whole period of investigation. Copeods were dominant in spring and autumn and had their maximum in summer. Considerable biomass peaks of cladocerans were observed only in some years in connection with low salinities and high temperatures. A peak of meroplanktic larvae of polychates was observed in late autumn since 1989. Copepods were inversily correlated with the pH-value. An inverse correlation was also found between rotifers and water temperature.  相似文献   

A study on the reaction kinetics of mineral surface adsorption in mix system     

Daqing Wu  Guiyi Diao  Jinlian Peng 《中国科学D辑(英文版)》1999,42(3):250-257

The experimental results on adsorption of ions pb²⁺, Zn²⁺ and Ag⁺ onto mineral surfaces in a mix system show that the reaction kinetics of adions adsorbed onto mineral surfaces was mainly controlled by their diffusion rates in solution. The concentration variations can be fit for the second-order rate equation with good determined coefficients r = 0.800 5—0.979 7. In the near neutral solution, the concentration of exchanged ions K⁺ and Na⁺ related to reaction time can be described by the fint-order rate equation with r = 0.855 7–0.997 7. Meanwhile, the complex diffusionexchange rate equation is suitable for describing the ca^{2 +} concentration variation, as ions Pb^{2 +} and Zn²⁺ were adions. Experimental data show that the amount of ions K⁺, Na⁺and Ca²⁺ release is much more than that of adion decrement in solution. This fact may suggest that the complexstion reaction of adions Pb²⁺, Z²⁺ and Ag⁺ with the mineral surfaces was the major reaction process while adions were not entering the phyllosilicate interlayers or CaCO₃ lattice to exchange the ions K⁺, Na⁺ and Ca²⁺ at room temperature. Project supported by the National Natural Science Foundation of China (Grant No. 49773206) and the Natural Science Foundation of Guangdong Province (Grant No. 960504)  相似文献   

共存矿物溶解度与硫化物金属成矿作用   总被引：2，自引：0，他引：2       下载免费PDF全文

岑况 《地质学报》1999,73(3):243-249

金属矿床的主要金属矿物以硫化物矿物为主。硫化物与不同类型的岩石（矿物）共生时,体系溶液中硫化物的溶解度存在明显的差异,这种矿物共存溶解性质的差异导致特别的地球化学行为。本文提出了共存矿物溶解度的概念及其计算的理论和方法。并以铜陵天马山铜金硫化物矿床为例,分别计算了黄铁矿、黄铜矿和石英（砂岩环境）或方解石（碳酸盐岩环境）的共存矿物溶解度。结果表明了成矿流体流经砂岩并溶解砂岩中的原生内铁矿最终流到砂岩  相似文献   

柴达木盆地周边火山岩产出地质特征和含矿性     

姜福芝  王玉往 《地质论评》1999,45(7):1019-1027

柴达木盆地周边火山岩十分发育,形成巨大的环状火山岩带。本文着重于研究火山岩的时空分布、产出古地理环境、以及它们的岩石学和岩石化学,以指出其产出构造环境和演化地质历史。根据火山成矿作用与铜多金属等矿产的密切关系和该区火山岩含矿特征,探讨了其含矿可能性。  相似文献   

Crystal chemical properties of synthetic lazulite–scorzalite solid-solution series     

P. Schmid-Beurmann  St. Knitter  L. Cemič 《Physics and Chemistry of Minerals》1999,26(6):496-505

Members of the lazulite–scorzalite (MgAl₂- (PO₄)₂(OH)₂-FeAl₂(PO₄)₂(OH)₂) solid-solution series were synthesized in compositional steps of 12.5?mol% at T?=?485?°C and P?=?0.3?GPa under hydrothermal conditions and controlled oxygen fugacities of the Ni/NiO-buffer. X-ray powder diffraction and ⁵⁷Fe-Mössbauer studies show that under these conditions a complete solid-solution series is formed which is characterized by the substitution of Mg²⁺ and Fe²⁺ on the octahedral Me ²⁺ site. The ⁵⁷Fe-Mössbauer spectra which reveal the presence of both ferrous and ferric iron and the compositional data were interpreted in terms of a defect model with a distribution of the ferric ions over both the Me ²⁺ and the Al³⁺ positions and vacancies on the Me ²⁺ site. The ⁵⁷Fe-Mössbauer parameters of the synthetic compounds correspond to those of natural lazulites except for the total absorption ratio of the ferric iron A(Fe³⁺)/(A(Fe³⁺)+A(Fe²⁺)), which is significantly higher in natural lazulites of the same composition. The total absorption ratio of the ferric iron increases from 4% in pure scorzalite to 15% in a Mg-rich solid-solution with x _Fe ?=?12(1)%  相似文献   

A time-geographical approach to the study of everyday life of individuals – a challenge of complexity     

Kajsa Ellegård 《GeoJournal》1999,48(3):167-175

  相似文献   

黔西南煤层主要伴生矿物中汞的分布特征   总被引：10，自引：2，他引：8  

张军营  刘建荣 《地质论评》1999,45(5):539-542

将黔西南煤层中不同同成因的７种主要矿物分离,对其进行光学显微镜,扫描电镜及能谱分析,利用冷原子吸光谱测定煤及矿物中汞的含量;并结合矿物包裹体测量和硫同位素分析,研究结果表明,黔西南煤层中汞主发布于矿物中。  相似文献