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1.
认为牛井山蛇绿构造混杂岩与铜厂街蛇绿岩相当;新建石鼓蛇绿构造混杂岩;沿怒江断裂带多处发现硅质岩、浅变质玄武岩及砂板岩复理石建造;澜沧江构造带东侧发现大量火山岩;结晶基底中有大量变形变质古老花岗岩类。  相似文献   

2.
认为牛井山蛇绿构造混杂岩与铜厂街蛇绿岩相当;新建石鼓蛇绿构造混杂岩;沿怒江断裂带多处发现硅质岩、浅变质玄武岩及砂板岩复理石建造;澜沧江构造带东侧发现大量火山岩;结晶基底中有大量变形变质古老花岗岩类.  相似文献   

3.
《沉积与特提斯地质》2005,25(1):145-147
认为牛井山蛇绿构造混杂岩与铜厂街蛇绿岩相当；新建石鼓蛇绿构造混杂岩，沿怒江断裂带多处发现硅质岩，浅变质玄武岩及砂板岩复理石建造；澜沧江构造带东侧发现大量火山岩；结晶基底中有大量变形变质古老花岗岩类。  相似文献   

4.
地层方面,重新厘定了地层区划界线并建立接奴群多仁组、日松组,发现了中晚志留世地层;厘定与划分了日干配错群,修订了欧利组并确定其时代,建立五峰尖组。岩石方面,建立侵入岩岩石谱系单位并划分构造 岩浆组合带;在南羌塘地区发现了海西期石英闪长岩石炭—侏罗纪地层中发现火山岩夹层及透镜体。构造方面,首次在班公湖怒江带北侧划分出五峰尖 拉热拉新晚侏罗世—早白垩世陆缘火山岩浆弧带Ⅲ级构造单元,将班公湖蛇绿混杂岩带划分为北亚带和南亚带两个构造单元,基本查明了班公湖蛇绿混杂岩带的内部结构、物质组成及其边界断裂特征,探讨了班公湖 怒江结合带西段的弧盆系时空结构,对班公湖地区中生代特提斯洋的演化规律作了系统总结。新发现一些矿产资源。  相似文献   

5.
地层方面,重新厘定了地层区划界线并建立接奴群多仁组、日松组,发现了中晚志留世地层;厘定与划分了日干配错群,修订了欧利组并确定其时代,建立五峰尖组.岩石方面,建立侵入岩岩石谱系单位并划分构造-岩浆组合带;在南羌塘地区发现了海西期石英闪长岩石炭-侏罗纪地层中发现火山岩夹层及透镜体.构造方面,首次在班公湖-怒江带北侧划分出五峰尖-拉热拉新晚侏罗世-早白垩世陆缘火山岩浆弧带Ⅲ级构造单元,将班公湖蛇绿混杂岩带划分为北亚带和南亚带两个构造单元,基本查明了班公湖蛇绿混杂岩带的内部结构、物质组成及其边界断裂特征,探讨了班公湖-怒江结合带西段的弧-盆系时空结构,对班公湖地区中生代特提斯洋的演化规律作了系统总结.新发现一些矿产资源.  相似文献   

6.
地层方面,重新厘定了地层区划界线并建立接奴群多仁组、日松组,发现了中晚志留世地层;厘定与划分了日干配错群,修订了欧利组并确定其时代,建立五峰尖组.岩石方面,建立侵入岩岩石谱系单位并划分构造-岩浆组合带;在南羌塘地区发现了海西期石英闪长岩石炭-侏罗纪地层中发现火山岩夹层及透镜体.构造方面,首次在班公湖-怒江带北侧划分出五峰尖-拉热拉新晚侏罗世-早白垩世陆缘火山岩浆弧带Ⅲ级构造单元,将班公湖蛇绿混杂岩带划分为北亚带和南亚带两个构造单元,基本查明了班公湖蛇绿混杂岩带的内部结构、物质组成及其边界断裂特征,探讨了班公湖-怒江结合带西段的弧-盆系时空结构,对班公湖地区中生代特提斯洋的演化规律作了系统总结.新发现一些矿产资源.  相似文献   

7.
地层方面，重新厘定了地层区划界线并建立接奴群多仁组、日松组，发现了中晚志留世地层；厘定与划分了日干配错群，修订了欧利组并确定其时代，建立五峰尖组。岩石方面，建立侵入岩岩石谱系单位并划分构造-岩浆组合带；在南羌塘地区发现了海西期石英闪长岩石炭-侏罗纪地层中发现火山岩夹层及透镜体。构造方面，首次在班公湖-怒江带北侧划分出五峰尖-拉热拉新晚侏罗世-早白垩世陆缘火山岩浆弧带Ⅲ级构造单元，将班公湖蛇绿混杂岩带划分为北亚带和南亚带两个构造单元，基本查明了班公湖蛇绿混杂岩带的内部结构、物质组成及其边界断裂特征，探讨了班公湖-怒江结合带西段的弧-盆系时空结构，对班公湖地区中生代特提斯洋的演化规律作了系统总结。新发现一些矿产资源。  相似文献   

8.
1∶25万查多岗日幅、布若错幅地质调查成果与进展   总被引：1，自引：0，他引：1  
侏罗系和上三叠统肖茶卡组中采获较丰富的双壳类、腕足类、珊瑚、菊石、海绵等化石;首次在展金组、曲地组中发现瓣鳃、腕足类、介形虫、放射虫等古生物化石;首次在新近系唢呐湖组中发现瓣鳃类和植物化石;首次在图北湖一带曲地组中发现(竹蜓)科化石,初步鉴定为Misellina等,属于典型的暖水相动物,常见于华南地区,说明早二叠世测区已进入古特提斯构造发展阶段;首次在原划若拉岗日岩群中发现放射虫化石.首次在一级河流阶地分别获取14C年龄值15600±540a和13390±670a,暗示了羌塘高原在更新世以来发生了一次明显隆升过程.新发现多处侏罗系小型生物礁(点礁).查明若拉岗日岩群的物质组成及变形变质特征,建立了弯岛弧湖蛇绿构造混杂岩带.查明测区中部一带出露新生代花岗斑岩,岩石化学特征反映为橄榄粗玄岩序列,属于同碰撞花岗岩,代表燕山晚期造山作用的产物.对大横山构造带内出露岩浆岩调查取得新的认识,蛇绿岩残片的存在,对认识大横山构造带的构造属性起到重要的作用,肯定了金沙江结合带西延至测区.基本查明测区变质岩的岩石类型其分布特征,查明蓝闪片岩带岩石类型、变形变质特征、空间分布,硬柱石与蓝闪石共生说明了红脊山蓝闪片岩可能属于碰撞造成的产物.查明戈木日岩组(?)中级变质岩系的分布及岩石类型、变形变质特征.查明红脊山构造带的空间分布的变形、变质特征.基本查明了测区内断裂构造形迹的基本特征,甜水河-弯岛湖北西断裂带的是一条控相的左行走滑断层.  相似文献   

9.
侏罗系和上三叠统肖茶卡组中采获较丰富的双壳类、腕足类、珊瑚、菊石、海绵等化石;首次在展金组、曲地组中发现瓣鳃、腕足类、介形虫、放射虫等古生物化石;首次在新近系唢呐湖组中发现瓣鳃类和植物化石;首次在图北湖一带曲地组中发现科化石,初步鉴定为Misellina等,属于典型的暖水相动物,常见于华南地区,说明早二叠世测区已进入古特提斯构造发展阶段;首次在原划若拉岗日岩群中发现放射虫化石。首次在一级河流阶地分别获取1 4 C年龄值1 5 6 0 0±5 4 0a和1 3390±6 70a ,暗示了羌塘高原在更新世以来发生了一次明显隆升过程。新发现多处侏罗系小型生物礁(点礁)。查明若拉岗日岩群的物质组成及变形变质特征,建立了弯岛弧湖蛇绿构造混杂岩带。查明测区中部一带出露新生代花岗斑岩,岩石化学特征反映为橄榄粗玄岩序列,属于同碰撞花岗岩,代表燕山晚期造山作用的产物。对大横山构造带内出露岩浆岩调查取得新的认识,蛇绿岩残片的存在,对认识大横山构造带的构造属性起到重要的作用,肯定了金沙江结合带西延至测区。基本查明测区变质岩的岩石类型其分布特征,查明蓝闪片岩带岩石类型、变形变质特征、空间分布,硬柱石与蓝闪石共生说明了红脊山蓝闪片岩可能属于碰撞造成的产物。查明戈木日岩组(?)中级变质岩系的分布  相似文献   

10.
建立和完善了测区地层系统,将地层划为5个地层分区,并划分出35个正式、非正式地层单位;将洞嘎曲一带原划的嘎波组划分为曲龙共巴组及拉康组一、二段3个填图单元;确认宗卓组与下伏地层为角度不整合,甲不拉组与桑秀组、桑秀组与维美组、维美组与遮拉组之间均为平行不整合接触;确立了2个SB1界面和2个SB2界面;首次发现涅如组上部发育一套含砾中粗粒岩屑砂岩及灰绿色粉砂质板岩,并广泛发育冲刷面,并在该组中新采获四川方锥石和马鞍塘方锥石化石;朗杰学群中含大量基性火山岩,总体上为斜坡-盆地相,产大量薄壳型双壳,各岩组、岩性段间多呈断层接触;在章村岩组中新采获植物化石.在邛多江-卡拉-玉门复合断裂北侧的玉门一带朗杰学岩群与涅如组间新发现蛇绿混杂岩,基质中采获化石;发现拉多-白露一带朗县混杂岩由众多的构造岩片组成.在扎日区的夏格勒桥附近的南迦巴瓦岩群片麻岩和绕让肉切村岩群片岩中新的同位素年龄.查明区内含火山岩的地层有7个层位;查明了火山岩的形成的构造环境.在马扎拉一带发现了锑金矿.  相似文献   

11.
Komatiites are mantle-derived ultramafic volcanic rocks. Komatiites have been discovered in several States of India, notably in Karnataka. Studies on the distribution of trace-elements in the komatiites of India are very few. This paper proposes a simple, accurate, precise, rapid, and non-destructive wavelength-dispersive x-ray fluorescence (WDXRF) spectrometric technique for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites, and discusses the accuracy, precision, limits of detection, x-ray spectral-line interferences, inter-element effects, speed, advantages, and limitations of the technique. The accuracy of the technique is excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Zr, Nb, Ba, Pb, and Th and very good (within 4%) for Y. The precision is also excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th. The limits of detection are: 1 ppm for Sc and V; 2 ppm for Cr, Co, and Ni; 3 ppm for Cu, Zn, Rb, and Sr; 4 ppm for Y and Zr; 6 ppm for Nb; 10 ppm for Ba; 13 ppm for Pb; and 14 ppm for Th. The time taken for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in a batch of 24 samples of komatiites, for a replication of four analyses per sample, by one operator, using a manual WDXRF spectrometer, is only 60 hours.  相似文献   

12.
This paper reports the first results of a study of 11 isotope systems (3He/4He, 40Ar/36Ar, 34S/32S, 65Cu/63Cu, 62Ni/60Ni, 87Sr/86Sr, 143Nd/144Nd, 206–208Pb/204Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others.  相似文献   

13.
最新的流行病学研究表明,空气中较高浓度的悬浮细颗粒可能对人类的健康有不利的影响。根据该项研究显示,由于心脏病、慢性呼吸问题和肺功能指标恶化而导致死亡率的升高与细尘粒子有关。这些研究结果已经促使欧盟于1999年4月出台了限制空气中二氧化硫、二氧化氮、氧化氮、铅和颗粒物含量的法案(1999/30/EC),对各项指标包括对可吸入PM10颗粒的浓度提出了新的限制性指标。PM10颗粒是指可以通过预分级器分离采集的气体动力学直径小于10μm的细颗粒。目前研究的兴趣重点逐步偏向PM2.5这些更细微颗粒物,PM2.5这种颗粒物对健康有明显的不利影响。在欧盟指令2008/50/EC中,对PM10和PM2.5都提  相似文献   

14.
本文介绍样品经四硼酸锂熔融制成玻璃小饼。采用Lachance模式和理论a系数来校正元素间的效应,由3080E型X-射线荧光谱仪和DF-350B数据处理系统完成硅酸盐中十三个项目的测定。  相似文献   

15.
本文拟定了一种以熔融法制备样片,用X射线荧光光谱测定硅酸盐类样品中Si、Fe、Al、Tj、Mn、Ca、Mg、K、Na、P等元素的分析方法。在对不同靶材X光管和分光晶体实验对比的基础上,选择了最佳的测量条件。该法具有快速、准确,测量范围广,检测限低,价格便宜等优点。经过近百个各种类型标样或管理样品的分析对比表明,本法不仅适用于硅酸盐类岩石样品的分析,还适用于铁矿、铝土矿、碳酸盐类岩矿样品以及水泥、耐火材料等样品的分析。  相似文献   

16.
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17.
Mining induced subsidence can significantly affect mining costs where major surface facilities and natural environment need to be protected. Overburden grout injection is a technology used to control coal mine subsidence by injecting the mine waste material extracted from the coal back into the inter-burden rock during longwall mining. The flowing slurry is here categorised as a nonlinear viscous cohesive (Bingham plastic) fluid. During longwall mining the grout slurry is pumped into the separated beds of the rock mass through a central vertical borehole, which is drilled deep into the inter-burden rock strata above the coal seam. However, a blockage can occur in the injection system when the slurry velocity falls below a certain critical threshold velocity, indicating a material phase change from cohesive-viscous to cohesive-frictional. In situ field injection tests through boreholes have been simulated at a smaller scale at the CSIRO laboratory in Brisbane by pumping the slurry through a radial disk (gap = 4 mm) from its centre. Laboratory experiments indicate a general, nonlinear, cohesive, viscous, frictional model for shear behaviour of the slurry, in which the material shear parameters are functions of the disk radial distance. Complete dimensional and dimensionless analytical solutions have been developed based on an approach related to Bingham–Herschel–Bulkley fluid mechanics. The derived formulae include relations for minimum pump pressure, local pressure and pressure gradient, wall shear stress, volume rate, velocity and velocity gradient. The theoretical results match the experimental measurements. The experiments covered slurries with maximum particle sizes of 0.5 to 2 mm with about 50% being larger than 100 µm. The viscosities at the various solids concentrations were measured with a standard torsion viscometer. This study differs from the previous research in several distinct aspects, namely, consideration of the variable shear parameters rather than fixed values, inclusion of total nonlinear behaviour, and implementation of a friction function to mimic behaviour of the deposited and consolidating stiff slurry, which can cause a significant pressure rise as a result of the increased shear resistance.  相似文献   

18.
《Applied Geochemistry》2001,16(2):137-159
Five hundred and ninety-eight samples of terrestrial moss (Hylocomium splendens and Pleurozium schreberi) collected from a 188,000 km2 area of the central Barents region (NE Norway, N Finland, NW Russia) were analysed by ICP-AES and ICP-MS. Analytical results for Al, B, Ba, Ca, K, La, Mg, Mn, Na, P, Rb, Si, Sr, Th, U and Y concentrations are reported here. Graphical methods of data analysis, such as geochemical maps, cumulative frequency diagrams, boxplots and scatterplots, are used to interpret the origin of the patterns for these elements. None of the elements reported here are emitted in significant amounts from the smelting industry on the Kola Peninsula. Despite the conventional view that moss chemistry reflects atmospheric element input, the nature of the underlying mineral substrate (regolith or bedrock) is found to have a considerable influence on moss composition for several elements. This influence of the chemistry of the mineral substrate can take place in a variety of ways. (1) It can be completely natural, reflecting the ability of higher plants to take up elements from deep soil horizons and shed them with litterfall onto the surface. (2) It can result from naturally increased soil dust input where vegetation is scarce due to harsh climatic conditions for instance. Alternatively, substrate influence can be enhanced by human activity, such as open-cast mining, creation of ‘technogenic deserts’, or handling, transport and storage of ore and ore products, all of which magnify the natural elemental flux from bedrock to ground vegetation. Seaspray is another natural process affecting moss composition in the area (Mg, Na), and this is most visible in the Norwegian part of the study area. Presence or absence of some plant species, e.g., lichens, seems to influence moss chemistry. This is shown by the low concentrations of B or K in moss on the Finnish and Norwegian side of the (fenced) border with Russia, contrasting with high concentrations on the other side (intensive reindeer husbandry west of the border has selectively depleted the lichen population).  相似文献   

19.
We have developed a set of four synthetic standards for the rare earth and high field strength elements designed for use in the determination of those elements in silicates. The base material is a glass nominally at the eutectic of the MgO-Al2O3-SiO2 ternary system. The nominal doping level was 2 wt% of the elements as oxides. To avoid problems associated with peak interference, the elements were doped in four separate glasses.  相似文献   

20.
Bellechester, Minnesota, is a small community of approximately 155 residents located on the county line between Goodhue and Wabasha counties in southeast Minnesota's karst region. Bellechester is served by a 21-year-old wastewater treatment facility (WWTF) consisting of three waste-stabilization ponds. On 28 April 1992 six sinkholes were discovered to have drained cell 2 of the WWTF resulting in the loss of approximately 8.7×106 1 of partially treated effluent and about 600 m3 of soil into previously undetected subsurface voids of unknown dimensions. In the week following the collapse, approximately 200 water wells located within a 5-km radius of the WWTF were sampled in an after-the-fact, emergency sampling program. Twelve samples with elevated fecal coliform levels, 18 samples with nitrate-nitrogen greater than the 10 mg/1 standard, and no samples with elevated chlorides were found. However, the elevated levels could not be unambiguously attributed to the WWTF collapse. This is the third WWTF to fail by sinkhole collapse in southeast Minnesota since 1974. All three collapsed lagoons have been located in similar geomorphic and stratigraphic settings. However, at least two lagoons have collapsed in the adjacent area in northeast Iowa, and these lagoons are located at different stratigraphic positions. Twenty-two WWTFs constructed in southeast Minnesota's karst region in the last 25 years have been identified as subject to potential sinkhole collapse. An unknown but significant number of manure storage lagoons, flood control structures, etc., have also been constructed in the karst region and are at risk. Public agencies are beginning to develop plans to deal with the risk associated with existing and future waste lagoons in this environment. The critical hydrogeologic parameters that can be used to prioritize the risk of collapse at existing facilities include: (1) the lithology of the first bedrock beneath each lagoon, (2) the thickness of surficial materials between the lagoon and the bedrock surface, (3) the presence and construction of liners (seepage rate), and (4) the proximity to existing sinkholes.  相似文献   

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