中南地区碎裂蚀变花岗岩型铀矿溶浸试验     

周青生  李建红  罗毅  王明太  孙志富  林利 《国外铀金地质》2010,(1):47-54

简要叙述了溶浸采矿的重要意义,并主要以GX铀矿样为例进行碎裂蚀变花岗岩型铀矿溶浸试验。介绍了中南地区碎裂蚀变花岗岩型铀矿样的矿物组成及性质、铀含量、化学组分、原矿筛析、柱浸和富集过程,以及溶浸采矿的直接成本核算方法与核算结果。该试验结果为本区溶浸采矿的半工业试验提供了基础数据。  相似文献   

西秦岭凤太矿集区丝毛岭金矿床地质地球化学特征   总被引：1，自引：0，他引：1  

李霞  王义天  王瑞廷  李建华  王长安  汶博  王胜利 《岩石学报》2010,26(3):717-728

西秦岭凤太矿集区丝毛岭金矿床位于八卦庙造山型金矿床西侧5km左右,是一个新探明的剪切带型金矿。其成矿作用过程可分为早期石英-绢云母-硫化物阶段、中期多金属-硫化物阶段和晚期碳酸盐阶段。对早、中期的石英流体包裹体测试结果表明,丝毛岭金矿床成矿流体以富CO2、中温、低盐度为特征,总体上属于中温低盐度CO2-H2O体系,流体包裹体类型的多样性是流体不混溶性的产物。从早阶段到主成矿阶段成矿流体的温度、压力和盐度均有降低,硫逸度增高,有利于金的沉淀富集。H、O、S、C同位素研究结果,以及与八卦庙金矿床的对比分析表明,二者的成矿流体具有相似性和同源性,都是以深部来源为主的多源流体。由于丝毛岭金矿床产出的层位高于八卦庙金矿床,其成矿环境相对开放。  相似文献   

兰坪盆地白秧坪银铜多金属矿集区中银、钴、铋、镍的赋存状态与成因意义   总被引：7，自引：1，他引：6  

刘家军  翟德高  李志明  何明勤  刘玉平  李朝阳 《岩石学报》2010,26(6):1646-1660

白秧坪银铜多金属矿集区位于兰坪盆地北部。矿集区可分为东、西两个成矿带。赋矿地层主要为上三叠统三合洞组碳酸盐岩、第三系始新统保相寺组碎屑岩和下白垩统景星组碎屑岩。矿体主要以脉状、网脉状及透镜状形式产出。作者通过显微镜观察、电子探针和扫描分析等综合分析技术,确认白秧坪银铜多金属矿集区中矿物组成相当丰富,已鉴定出的矿物超过50种,既有大量硫化物、硫盐、氧化物、硫酸盐、碳酸盐,又有自然金属及金属互化物、卤化物等。除常见矿物为黄铁矿、毒砂、白铁矿、黄铜矿、方铅矿、闪锌矿、黝铜矿、砷黝铜矿、铜蓝、斑铜矿、辉铜矿、雌黄、菱铁矿、方解石、铁白云石、重晶石、天青石和石英外,作者还鉴定出一些银、钴、铋、镍、砷、锑的矿物,如自然铋、辉铋矿、辉银矿、辉砷钴矿、硫钴镍矿、硫铜铋矿、硫铋铜矿、辉砷镍矿、车轮矿、硫砷铜矿、单斜硫砷铅矿、灰硫砷铅矿等。矿石中矿物种类较多,组成较复杂,存在Co,Bi,Ni等元素的矿物,构成白秧坪银铜多金属矿集区的一大特色。在兰坪盆地白秧坪银铜多金属矿集区各矿段内,除了Cu、Pb、Zn构成工业矿体外,矿石中Ag、Co、Ni、Bi及As、Sb、Ba等元素的含量也相当高,可作为Cu-Pb-Zn-Ag-Co-Ni-Bi矿石来综合开发利用。白秧坪银铜多金属矿集区中Ag、Co、Ni、Bi等元素富集条件为低温、中低盐度,形成压力较小的浅成环境;成矿流体是一种富含CO2的Ca2+-Na+-SO24-Cl-类型、由大气降水演化而成的盆地热卤水。成矿物质主要来源于含有基性火山岩的兰坪盆地基底变质岩系。  相似文献   

斑岩型钼矿床研究进展   总被引：18，自引：5，他引：13  

简伟  柳维  石黎红 《矿床地质》2010,29(2):308-316

文章总结了北美西部及中国斑岩型钼矿床的研究成果,介绍了斑岩型钼矿床的分类、共生岩浆岩、矿化方式及蚀变特点,重点探讨了斑岩型钼矿床的成矿流体特点,钼在岩浆-热液系统中的富集沉淀机制以及斑岩型钼矿床的成矿物质来源。  相似文献   

Changes of chromium concentration in alluvial sediments of the Obra river valley     

Z. Młynarczyk  T. Sobczyński  M. Słowik 《Environmental Geology》2006,50(3):423-429

In this research work, changes in concentration of the chosen chemical element in alluvial sediments have been used to estimate the relative age of floodplain deposits. The research concerning changes of chromium concentration in alluvial deposits was done in the Obra river valley near Międzyrzecz (Western Poland). Chromium was chosen because of its low ability to migrate in groundwater environment. Moreover, this chemical element was used in the process of dyeing textures in Międzyrzecz between the sixteenth and the nineteenth century. Confrontation of changes in chromium concentration and age of alluvial sediments (age estimated in years BP using radiocarbon method) have shown that the sediments with higher chromium contents are much older than the period of development of the weaving industry in Międzyrzecz. Therefore, it is not possible to use changes in chromium concentration to estimate relative age of floodplain sediments. Despite information in the literature about low migration ability of this chemical component (Macioszczyk and Dobrzyński in Hydrogeochemia: strefy aktywnej wymiany wód podziemnych. PWN, Warszawa, 2002; Ball and Izbicki in Appl Geochem 19:1123–1135, 2004) migration of chromium is so intensive that distinct changes in its concentration are observed even before the period of increased human activity.

M. SłowikEmail:

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Source and dispersal of suspended sediment in the macro-tidal Gulf of Kachchh     

Ramaswamy V  Nath BN  Vethamony P  Illangovan D 《Marine pollution bulletin》2007,54(6):708-719

The macro-tidal Gulf of Kachchh, covering nearly 7000 km(2), is located about 150 km south of the Indus River mouth. In spite of semi-arid climate and lack of major rivers flowing into it, the Gulf is highly turbid with suspended sediment concentrations (SSC) during October-November 2002 ranging between 0.5 and 674 mgl(-1). Highly turbid waters are observed towards the northern portion of the mouth of the Gulf, at the head of the Gulf and adjacent to the numerous shoals present within the Gulf. Perennial high SSC in the Gulf is due to resuspension of sediments by strong tidal currents, shallow bathymetry and presence of fine-grained sediments on the sea floor. Numerical model studies show that there is a dynamic barrier in the central Gulf, which prevents the exchange of water and suspended sediments between the outer and inner Gulf. This dynamic barrier associated with strong east-west tidal currents restricts the turbid waters mainly to the northern Gulf, resulting in relatively clear waters (SSC<10 mgl(-1)) in the southern and central portions of the Gulf. Laser particle size distribution, clay mineralogy and geochemistry of the suspended matter show that the main source of sediments to the Gulf of Kachchh is the Indus River. Although the Indus discharge has been severely curtailed in the recent decades due to construction of numerous dams and barrages, the Gulf of Kachchh continues to receive resuspended sediments from the numerous meso and macro-tidal creeks of the Indus delta. The sediments at the head of the Gulf appear to be a mixture of sediments derived from the Indus as well as the numerous seasonal rivers draining the Rann of Kachchh.  相似文献   

枯季长江口南槽悬沙输运过程和机制研究     

施韩臻  李占海  汪亚平  贾建军  常洋  陈雅望 《海洋通报》2021,40(6):664-674

开展枯季河口悬沙输运机理研究对于揭示弱径流条件下的陆海相互作用、河口季节性冲淤和水沙关系等具有重要的科学意义.本文根据2018年12月18-25日长江口南槽3个站位连续13个潮周期的同步流速、流向和悬沙浓度等观测资料,运用通量机制分解法研究了各输沙项的特征、贡献和输运机理.结果 表明,从小潮至大潮流速和悬沙浓度不断增加,由南槽上部至下部流速和悬沙浓度逐渐降低.观测期间平均流速与平均悬沙浓度存在明显的正线性关系,但受底质空间差异影响,悬沙浓度对流速的响应强度存在显著的空间变化.枯季期间南槽存在着中上部向陆净输沙、下部向海净输沙的空间输运格局.平流输沙和潮泵输沙是影响和控制净输沙的关键因素,二者的强度和贡献存在明显的潮周期变化和空间变化,垂向环流输沙的强度很弱,对净输沙贡献很小.南槽涨落潮输沙不对称现象明显,流速、悬沙浓度和历时都具有一定的涨落潮不对称性,这些不对称现象共同调节和控制着潮周期净输沙强度和方向的时空变化.  相似文献   

台风对海洋叶绿素a浓度影响的延迟效应   总被引：2，自引：1，他引：1  

付东洋  丁又专  刘大召  潘德炉 《热带海洋学报》2009,28(2)

利用MODIS、SeaWiFS 3A资料详细分析了2000-2006年间西北太平洋海域主要台风对叶绿素a浓度的影响.结果发现,台风可导致叶绿素a浓度最大增长平均值为2.385倍,个别最高达10倍以上,且增长到最大值平均延迟5.94d;同时叶绿素a浓度最大值与无台风时叶绿素a浓度具有线性相关性,相关系数达0.889;叶绿素a浓度与相应的海域平均海水深度具有负的乘幂关系,其相关系数是0.87;台风后叶绿素a浓度的最大增长量与相应海域海水平均深度也呈负乘幂关系,其相关性略低于前者,相关系数为0.75.  相似文献   

一种新型水溶性聚氨酯表面活性剂的研制   总被引：1，自引：0，他引：1  

张燕  范玉华  赵宇  胡应模 《中国海洋大学学报(自然科学版)》2008,38(6)

以甲苯2,4-二异氰酸酯(TDI)、聚乙二醇(PEG800和PE G1000)、马来酸酐(MA)和三羟甲基丙烷(TMP)为主要原料,合成了2种水溶性聚氨酯表面活性剂(B1PEG800)和(B2PEG1000),用 FT-IR以及1HNMR对产物的分子结构进行了表征,并探讨了其最佳合成条件,同时对其CMC(临界胶束浓度)值、浊点和表面张力等性能进行了测定.结果表明,反应物在65 ℃反应4 h,并且在反应过程中添加35 mL丙酮/TDI/mol作为溶剂时产物的状态最好.用最大气泡压力法测得25 ℃B1 PEG800的临界胶束浓度为0.05 mol/L,此时的表面张力为33 mN/m;B2PEG1000的临界胶束浓度为0.037 5 mol/L,此时的表面张力为38.85 mN/m;溶液表现为牛顿型流体.  相似文献   

Sea ice thickness and concentration in Arctic obtaining from remote sensing images   总被引：7，自引：0，他引：7  

卢鹏  李志军  董西路  张占海  陈陟 《极地研究(英文版)》2004,15(2)

1　Introduction TheArcticOceanisoneoftheimportantcoldregionsontheearth,whichcanaffect globalclimateandoceancirculationseriously.Itsinteractionwiththeglobalclimatesystem isrepresentedbyseaice,whichisthemainfeatureonthesurfaceoftheArcticOcean(Aa gaardandCarmack1989).First,seaiceplaysapivotalroleintheheatandmassbalance onthesurfaceoftheArcticOcean.Seaicenotonlyobstructstheheatexchangebetweenat mosphereandocean,butalsoreflectsmostsolarradiationbacktotheatmospherebecause ofitshighalbedo(Gre…  相似文献