黄崖洞铁矿床地质特征及成因探讨

对黄崖洞铁矿床的区域地质背景、矿区地质特征、矿床及矿体地质特征进行了分析研究,并对矿床成因做初步探讨.全面总结该矿床的成因、构件要素及其与矿床表象特征之间的关系,从而确立在地层、构造、标志层等方面同类型矿床的找矿标志.     

广西环江板同铅锌矿床地质特征及成因探讨

文章阐述了广西环江板同铅锌矿床的地质特征和成矿地质环境,初步探讨了矿床成因,认为该矿床成因类型为岩浆期后中-低温热液裂隙充填型铅锌矿床.     

浅析铜凹铜矿床成矿地质条件与矿床成因

以区域地质背景和矿体地质特征为基础讨论了铜凹铜矿床的成矿地质条件与矿床成因,认为该矿床为沉积变质型铜矿床。     

广西大明山钨矿床内生成因论证

大明山钨矿床曾被认为属沉积—改造或沉积热液叠加成因,矿床的钨质主要来源于下泥盆统莲山组。笔者通过调查研究,获得了该矿床属内生成因的论据。现从成矿的区域地质条件、矿床地质特征及成矿机制的某些特点三方面进行论证。     

广西合浦县西场石英砂矿床地质特征及成因初探

文章分析了合浦县西场石英砂矿床的地质特征和成因,认为该矿床既具经济意义又具重要的地质和找矿意义。     

桂平市锡基坑铅锌矿床地质特征及外围找矿潜力分析

文章对桂平锡基坑铅锌矿床的成矿地质背景、矿床地质特征进行了总结和分析,并对矿床成因、成矿机理作了探讨,认为该矿床属热水沉积 构造热液叠加改造型层控矿床.并认为有相同成矿地质条件的锡基坑外围具有寻找中一大型规模铅锌矿床的潜力.     

浅析四道沟金矿矿床成因及找矿方向

四道沟金矿是地质条件较为复杂的矿床，对其成因问题前人观点众说不一。比较典型的主要有岩浆热液成因和沉积变质成因，成因不同直接影响着找矿方向。根据矿床地质特征和工作实践认为：该矿床成因应为沉积变质－ 岩浆热液叠加改造型矿床。所以沉积变质和岩浆热液成矿的有利条件均应成为找矿的主要方向。据此开展的找矿工作已初步获得突破性进展。     

内蒙古自治区毛登锡铜矿区成矿地质条件

通过收集地质资料和馆藏资料,综合分析了内蒙毛登锡铜矿的矿床地质特征、矿化富集特点、矿床成因及找矿标志。得出了毛登锡铜矿为岩浆期后中—高温热液型矿床,矿床的富集在空间和成因上与花岗斑岩体密切相关;岩体为该矿床成矿物质的主要来源,含矿热液沿北西向断裂及其派生的节理裂隙多次运移充填成矿。     

桂西北主要金矿床地质特征

桂西北微细粒浸染型金矿是广西近年来发现的新类型金矿床。本文在大量地质勘查资料基础上,通过对金牙、高龙两个典型矿床的综合研究进行了总结。论述了该类型矿床成矿的区域地质背景,矿床地质特征,并对成矿条件进行初步分析,探讨矿床成因和找矿方向。     

山西省刁泉银铜矿床地质特征

通过对刁泉银铜矿床区域成矿地质背景及矿区地质特征的分析研究,提出了矿床成因系与次火山岩有关的中低温热液银铜多金属矿床,研究其地质特征和成矿机理,对同类型矿床勘查有直接或间接的借鉴作用.     

GEOCHEMICAL STUDIES OF Fe,Mn,Co,As,Cr,Sb,Zn,Sc AND V IN SURFACE SEDIMENTS FROM JIAOZHOU BAY

The contents of nearly forty-elements in surface sediments in Jiaozhou Bay were determined using a Neutron Activation Analysis Technique(Grancini,et al.,1976;Li Peiquan et al.,1985,1986;Li Xiuxia etal.,1986).This paper's detailed discussion on only nine elements(Fe,Mn,Co,Cr,Sc,As,Sb,Zn andV)includes their distributions,concentrations,correlationships,material sources,background,etc.Based on Zavaristski's classification method,Fe,Mn,Co Cr and V belong to the second group;As and Sb to theeighth groups:Sc and Zn to the third and sixth groups.It was found that their notably good correla-tionship is mainly due to the similarity of their ionic structures and that their variation is controlled by theFe content(except Mn).The source of sediments is mainly terristrial material,and the composition ofsediment is similar to that of shale and shale+clay.The contents for a large number of ele-ments are within the scope of the background level,but there still is pollution of Zn and Cr,at least in a few stations.     

GROWTH, REPRODUCTION & POPULATION STRUCTURE OF THE FRESHWATER CRAB SINOPOTAMON YANG TSEKIENSE BOTT, 1967, FROM ZHEJIANG, CHINA

Monthly investigatiom were made on the population of Chinese freshwater crab, Sinopotamon yangteskiense Bott, 1967 from April, 1984 to Match, 1985. The data on 4413 specimens show that the growth was affected mainly by temperature. During the April to November growth period, the crabs' major development occured from June through October. One year was required for a fine white oocyte to develop into a mature egg. The reproduction period was June-October. Females bearing eggs were taken from June-August, and crabs with young were found from July-October. The females reproduced once a year but could for more than one year. The number of eggs carried by a female varied greatly according to the size of the crab, ranging from 30 to 100 eggs. New-bom crabs become mature after 1-2 yeats. The sex ratio was approximately 1:1 in the overall population. However, the larger crabs are predominantly male. The age distribution of S. yangtsekinese was estimated from size frequency histograms. There were more adult crabs     

Growth,reproduction & population structure of the freshwater crabSinopotamon yangtsekiense bott, 1967, from Zhejiang,China

Monthly investigations were mae on the population of Chinese freshwater crab,Sinopotamon yangtsekiense Bott, 1967 from April, 1984 to March, 1985. The data on 4413 specimens show that the growth was affected mainly by temperature. During the April to November growth period, the crabs' major development occurred from June through October. One year was required for a fine white oocyte to develop into a mature egg. The reproduction period was June–October. Females bearing eggs were taken from June–August, and crabs with young were found from July–October. The females reproduced once a year but could for more than one year. The number of eggs carried by a female varied greatly according to the size of the crab, ranging from 30 to 100 eggs. New-born crabs become mature after 1–2 years. The sex ratio was approximately 1∶1 in the overall population. However, the larger crabs are predominantly male. The age distribution ofS. yangtsekinese was estimated from size frequency histograms. There were more adult crabs (over 70%) from June to October and more immature crabs (over 50%) from November to May.     

Controlling mechanisms for the trace metals, (Cu,Zn, Cd,Fe, Co and Ni) in anoxic sea water in Saanich Inlet,British Columbia,Canada

A study was conducted on Cu, Zn, Cd, Fe, Co and Ni levels in Saanich Inlet anoxic seawater. Data on the concentration of these trace metals and H₂S, and other oceanographic parameters were obtained in four cruises. Equilibrium models are presented together with in situ data. The results strongly support the assumption that the solubilities of Cu, Zn, Cd, Fe, Co and Ni are controlled by bisulfide and/or polysulfide complexes. The species of Cu, Zn, Cd and Ni are shown to be Cu(S₄) ₂ ³⁻ and Cu(Sn₄S₅)³⁻, Zn(HS) ₂ ⁰ and ZnHS ₂ ⁻ , Cd(HS) ₂ ⁰ and Ni(HS) ₂ ⁰ , respectively. The solid species controlling Fe²⁺ and Co²⁺ are respectively the pyrohotites FeS and CoS. The data illustrates that thermodynamic equilibrium has been established in the H₂S-controlled seawater of Saanich Inlet, and that equilibrium has not been established in the H₂S−O₂-coexisted seawater of Saanich Inlet. The lack of equilibrium in the H₂S−O₂-coexisted seawater is a result of the flushing or mixing of oxygenated seawater with anoxic water. The new species of trace metals are still in the processes of reduction and precipitation. Contribution No. 1428 from Institute of Oceanology, Academia Sinica     

REQUIREMENTS OF SHRIMP, PENAEUS CHINENSIS O''''SBECK FOR POTASSIUM, SODIUM, MAGNESIUM AND IODINE

Potassium, sodium, magnesium and iodine requirements of shrimp, Penaeus chinensis were studied.Orthogonal design was employed in this experiment. The composition of the basal diet consisted of fishmeal, peanut cake, corn meal, soybean cake, wheat bran, vitamin mix and mineral mix, and supple-mentations of potassium, sodium, magnesium and iodine in the basal diet were made according to theL_9(3~4) orthogonal table. The results indicatal that iodine supplementation improved growth of the shrimpsignificantly and raised survival very significanly, iodine requirement of the shrimp was 0.003%, sodiumrequirement was 0.87% or less; and that 1.1-1.3% potassium and 0.18-0.38% magnesium in the dietwere proper nutrition supplements for the shrimp.     

RELATIONSHIPS BETWEEN FRACTIONATIONS OF Pb, Cd, Cu, Zn AND Ni AND SOIL PROPERTIES IN URBAN SOILS OF CHANGCHUN, CHINA

1IN T R O D U C T IO N With therapiddevelopment of urbanizatio,nurban land was exploitedand utilizetdoform differendtomains be- ing subjectto many potentialpollutionsourcessuch as vehicleemission, industrialactivitieasnd household garbage.Particularl, yur…     

气、水、岩、生、人相互作用及其环境效应

这里所指示的大气圈、水圈、岩石圈、生物圈以及人类的作用千变万化,从而对人类的生存造成巨大影响,构成了一个复杂的生态环境,讨论这些问题,对人类生存至关重要。     

IMPACT OF RIVER TRAINING WALLS ON ADJACENT BEACHES, BALLINA, NEW SOUTH WALES, AUSTRALIA

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｅｆｆｅｃｔｓｏｆｈｕｍａｎａｃｔｉｖｉｔｉｅｓｏｎｓｈｏｒｅｌｉｎｅｐｒｏｃｅｓｓｅｓｈａｖｅｂｅｅｎｃｏｎｓｉｄｅｒａｂｌｅ,ｐａｒｔｉｃｕｌａｒｌｙｏｖｅｒｔｈｅｌａｓｔｃｅｎｔｕｒｙ.Ｔｈｅｍｏｓｔｓｉｇｎｉｆｉｃａｎｔｅｆｆｅｃｔｓａｒｅｔｈｏｓｅｆｒｏｍｈａｒｂｏｕｒｃｏｎｓｔｒｕｃｔｉｏｎａｎｄｒｉｖｅｒｍｏｕｔｈｔｒａｉｎｉｎｇｗａｌｌ.Ｉｎｍａｎｙｉｎｓｔａｎｃｅｓ,ｍａｊｏｒｉｎｔｅｒｒｕｐｔｉｏｎｏｆｌｉｔｔｏｒａｌｄｒｉｆｔｒｅｓｕｌｔｅｄｆｒｏ…     

Requirements of shrimp,Penaeus chinensis O'sbeck for potassium,sodium, magnesium and iodine

Potassium, sodium, magnesium and iodine requirements of shrimp,Penaeus chinensis were studied. Orthogonal design was employed in this experiment. The composition of the basal diet consisted of fish meal, peanut cake, corn meal, soybean cake, wheat bran, vitamin mix and mineral mix, and supplementations of potassium, sodium, magnesium and iodine in the basal diet were made according to the L₉(3⁴) orthogonal table. The results indicated that iodine supplementation improved growth of the shrimp significantly and raised survival very significantly, iodine requirement of the shrimp was 0.003%; sodium requirement was 0.87% or less; and that 1.1–1.3% potassium and 0.18–0.38% magnesium in the diet were proper nutrition supplements for the shrimp. Contribution No. 2342 from the Institute of Oceanology, Chinese Academy of Sciences.     

Geological structure, composition of ores and age of the Bamsk gold deposit, Amur region, Russia

The Bamsk gold-ore deposit is located in the Amur region, the Far East of Russia. It is confined to the Early Cretaceous volcanic-plutonic uplift of central type, located in the Stanov folded-clumpy Pre-Cambrian system. The deposit is presented by a series of gold-bearing quartz and carbonate-quartz vein-stringer zones. They are confined to the super-intrusive zone of the Nevachansk subvolcanic intrusion of sienite-porphyric composition. The mineralization is being controlled by zone of fractures developed in the autochthone ofthe Bamsk fault. Quartz, carbonates and sericite prevail in the composition of ores. The quantity of ore minerals doesn't exceed 1%～5%. Pyrite, chalcopyrite, galena and native gold are widely spread. Sheelite, gold and silver tellurides, sulphobismuthites, acanthite, sphalerite and cinnabar are less developed. Four stages of mineralization have been distinguished. Gold-sulphide-sulphosalt ore with tellurides of gold and silver is productive for gold. The following set of elements is typomorphic for the ores of the deposit: Au, Ag, Cu, Bi,Mo, Pb and Sb (W1, Pb1, Mo) -Cu- (Ag, Bi, Sb, Mn, W1, Pb2) form the vertical series of zoning. Rocks, enclosing the mineralization are exposed to the processes of listvenitization-beresitization. The processes of gumbeization and argillization are less manifested. The age of the gold mineralization, determined by Rb-Sr method on ore-accompanying minerals, is 130.6 Ma.