共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
岩体型斜长岩是由90%或90%以上斜长石组成的岩浆岩,常赋存岩浆型Fe-Ti-P矿床,经常出现仅由铁钛氧化物和磷灰石组成的铁钛磷灰岩(Watson,1907).目前对于这种特殊矿石的成因,主要存在结晶分异(Mclelland等,1994)和不混溶作用(Philpotts,1967)两种不同看法.河北大庙斜长岩体为中国唯一的岩体型斜长岩,其所赋存Fe-Ti-P矿床中也出现有大量的铁钛磷灰岩,本文利用电子探针方法,系统分析了大庙Fe-Ti-P矿床中铁钛磷灰岩以及其它岩石和矿石的磁铁矿和钛铁矿成分,从矿物学角度分析铁钛磷灰岩的成因. 相似文献
3.
该文主要论述山东金伯利岩中镁钛铁矿特征和国内外含矿金伯利岩中钛铁矿特征基本一致。同时与非金伯利岩钛铁矿特征进行对比,可以看出山东金伯利岩中镁钛铁矿、特别是富铬高镁钛铁矿有明显标型特征,是寻找金刚石原生矿的标型矿物。 相似文献
4.
中国是世界钛资源大国, 2012年中国钛资源储量约占全球钛储量的31%（吴景荣等,2014）,位居世界前列,其主要分布在四川攀西、河北承德、云南、海南、广西和广东省（吴景荣等,2014;吴贤等,2006;胡克俊,2007）。国内钛矿资源主要有两种类型：钛铁矿（岩矿和砂矿）和金红石矿（胡克俊,2007）。 目前开发主要以钛铁砂矿和岩矿为主,可供利用或计划利用的钛铁砂矿主要集中在云南、广西、海南;原生钛铁岩矿主要为四川攀西和河北承德（吴贤等,2006;胡克俊,2007）。 相似文献
5.
美国科罗拉多州西南部Gunnison郡铁山Powderhorn寒武纪碱性杂岩体不仅以其成因独特。岩石矿物丰富多采闻名于世,而且也以其矿床规模宏伟,多种矿产资源能综合利用著称。此深源岩浆成因的超基性岩系列碳酸盐岩杂岩体展布面积超过五十平方公里,由辉岩、辉石黄长石岩、霓霞岩、霞石正长岩、辉石—正长岩、碳酸岩和磁铁矿-钛铁矿-钙钛矿分凝物等组成。这些岩石的生成年代顺序由老到新依次为辉岩。磁铁矿-钛铁 矿-钙钛 相似文献
6.
在对位于苏北榴辉岩分布区的中国大陆科学钻探工程（CCSD）5 158 m主孔岩心进行编录、岩矿鉴定及测试的过程可揭示主要有经济价值的含钛相是金红石，其次是钛磁铁矿。主要含矿岩石是：普遍金红石化榴辉岩、石英金红石榴辉岩、金红石含钒钛磁铁矿榴辉岩，其次有多硅白云母金红石榴辉岩、篮晶石金红石榴辉岩、金红石黑云绿帘纤闪石岩（退变榴辉岩）。根据不同的矿化程度和岩性组合，大致分为3大岩性段：（1）0~2 038 m为主孔各类榴辉岩主要产出深度，钛矿化最好、厚度也最大；（2）2 038~3 597 m为主孔弱钛矿化，分布零散，厚度较薄，含10层矿化（视厚度5~24 m不等）的退变-强退变的榴辉岩，主要围岩是榍石-钛铁矿-钛磁铁矿-黑云角闪长英质片麻岩，含白钛矿钛磁铁矿二长片麻岩，构造糜棱岩化或碎裂-角砾岩带发育，其中常见大小不等、晶簇状生长的石英方解石脉体和晶洞； （3）3 597 m~终孔主要为糜棱岩化强弱不同的含钛磁铁矿黑云角闪长英质片麻岩和糜棱岩化角闪黑云二长片麻岩夹角闪-黑云片岩，无榴辉岩，也无钛矿化。但在3 577~4 012 m发现了大量富含稀土矿物的脉体。主孔岩石类型主要有6种： 榴辉岩类，榴辉岩质片麻岩，石榴单辉橄榄岩，二长片麻岩和长英质片麻岩，纤闪石化辉石岩，碎裂岩和糜棱岩类。含钛相矿物有金红石，钛铁矿，榍石，钛斜硅镁石，白钛矿及少量锐钛矿，板钛矿。 相似文献
7.
在对位于苏北榴辉岩分布区的中国大陆科学钻探工程5158m主孔岩芯进行编录、岩矿鉴定及测试的过程中,对主孔岩芯的钛矿化进行了研究。主要有经济价值的含钛相是金红石,其次是钛磁铁矿。主要含矿岩石是普通金红石榴辉岩,石英金红石榴辉岩,金红石/钛铁矿石榴辉石岩,其次有多硅白云母金红石榴辉岩,蓝晶石金红石榴辉岩,金红石黑云绿帘纤闪石岩(退变石榴辉石岩)。根据不同的矿化程度和岩性组合,将整个主孔大致分为三大岩性段： ① 0～2038m：为主孔各类榴辉岩主要产出、钛矿化最好、厚度最大的地段; ② 2038～3597m：为主孔钛矿化贫化、分布零散、厚度较薄的岩性段,含13层矿化视厚度4～37m不等的退变～强退变的榴辉岩,主要围岩是榍石钛铁矿钛磁铁矿黑云角闪长英质片麻岩以及含白钛矿钛磁铁矿二长片麻岩,构造糜棱岩化或碎裂～角砾岩带发育,其中常见大小不等、晶簇状生长的石英方解石脉体和晶洞; ③ 3597m～终孔：主要为糜棱岩化强弱不同的含钛磁铁矿黑云角闪长英质片麻岩和糜棱岩化角闪黑云二长片麻岩夹角闪黑云片岩,无榴辉岩。但在3577～5150m发现了大量富含稀土矿物的脉体。主孔岩石类型主要有6种： 榴辉岩类,榴辉岩质片麻岩,石榴单辉橄榄岩,二长片麻岩和长英质片麻岩,纤闪石化辉石岩,碎裂岩和糜棱岩类。含钛矿物有金红石,钛铁矿,榍石,钛斜硅镁石,白钛矿及少量锐钛矿,板钛矿。矿石类型可分为13类。文章阐述了含钛相矿物学、金红石化学成分及微量元素特征以及金红石的成矿地球化学特征;讨论了超高压变质成矿及钛物质来源于罗迪尼亚超大陆形成后的新元古代裂解事件中的地幔柱的成矿模式。 相似文献
8.
本文研究了中国东部金伯利岩中富铬黑镁铁钛矿、沂蒙矿、钛铁矿、硅铁石及其富钛物相以及未定名的富钛矿物。富铬黑镁铁钛矿是首次报道的黑镁铁钛矿的新变种,产于山东金伯利岩岩管中。富铬黑镁铁钛矿和沂蒙矿都是上地幔交代产物。河南金伯利岩中的钛铁矿表明该区金伯利岩岩浆为未分异的硅酸盐和碳酸盐岩浆。 相似文献
9.
10.
新疆卡拉麦里蛇绿混杂岩带中广泛存在斜长花岗岩,对其形成时代及成因尚存较大争议。岩石地球化学显示该花岗岩具高硅、富铝和钠,低镁和钾特征;轻稀土富集,具Eu的负异常(δEu为0.55~0.78)。岩石富Ba,Th,亏损 Nb,Ti 等。对该苏吉泉东斜长花岗岩的成因研究进行探索,认为该斜长花岗岩是在低压低温条件下镁铁质洋壳发生部分熔融的产物,残留相为斜长石+角闪石±斜方辉石±钛铁矿(无石榴子石)。结合区域地质资料,苏吉泉东斜长花岗岩可能是处于早石炭世后碰撞背景下的一次构造-热事件产物,而非是蛇绿岩中的浅色岩。 相似文献
11.
S. Viswanathan K. Surya Prakash Rao B. Mahabaleswar 《Journal of the Geological Society of India》2013,82(6):621-627
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.
奥地利安东帕有限公司 《岩矿测试》2009,28(3):306-306
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
13.
E. M. Prasolov S. A. Sergeev B. V. Belyatsky E. S. Bogomolov K. A. Gruzdov I. N. Kapitonov R. Sh. Krymsky V. O. Khalenev 《Geochemistry International》2018,56(1):46-64
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
14.
15.
16.
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
17.
18.
Between 1985 and 1991, two new mountain protected areas (MTNPA) covering more than 35,000 km2 and based on participatory management models — the Makalu-Barun National Park and Conservation Area, Nepal, and Qomolangma Nature Preserve, Tibet Autonomous Region — were successfully established through the collaborative efforts of Woodlands Mountain Institute and conservationists in China and Nepal. Characteristics common to both projects include the importance of establishing (1) effective rationales, (2) local support constituencies, (3) a senior advisory group, (4) a task force, (5) linkages between conservation and development, and (6) fund raising mechanisms. The lessons derived from the experiences of Woodlands Mountain Institute are of significant value to others in preserving MTNPA. Increased collaboration and communication between all interested in conservation, however, will remain a critical component for expanding mountain protected area coverage to throughout the world. 相似文献
19.
岩石密度和超高压岩石折返速率 总被引：1，自引：3，他引：1
在常温常压条件下对中国大陆科学钻CCSD主孔100-3000米岩心样品进行了密度测量,建立了密度连续剖面,并界定了不同超高压岩石的密度值。通过对比高温高压物性实验资料,岩石密度随着退变程度增强而降低,榴辉岩密度变化序列为3.52g/cm3→3.49g/cm3→3.07g/cm3→2.93g/cm3。超高压长英质岩石密度变化序列为3.00g/cm→2.80g/cm3→2.65g/cm3。上述实验资料是讨论不同折返阶段岩石所受浮力的基础,为研究折返速率大小提供了基本参数。本文通过折返板块运动平衡时,上浮力与粘滞力平衡这一关系式,定量研究了大陆俯冲板块的折返速率,认为密度差产生上浮力从而引起折返,温度对板块折返速率的影响最为显著;密度差大小、折返角度、折返板块大小对折返速率也有直接的影响。定量模拟分析表明,在温度高于850℃时,板块的折返速率可以超过100mm/a;当温度降至700℃时,折返速率则低于1.5mm/a。作者认为在折返早期,温度较高,板块快速折返至60-70km榴辉岩相深度;随着传导散热,温度降低,板块以较慢的速率折返至中下地壳。折返速率的估算表明,浮力是板块折返第一阶段(从>100km深部折返至<40km的中下地壳)的主要驱动力。 相似文献
20.
《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