共查询到20条相似文献，搜索用时 62 毫秒
1.
在西藏罗布莎蛇绿岩块的铬铁矿中，存在一种Fe—Cr—Ni合金，电子探针分析确定其化学分子式为Ni0.45 Cr0．29 Fe0．26。其x射线粉晶衍射数据(括号内为I／Io，hkl)为：2．060(100，111)、1．775(70，200)、1．261(60，220)、1．076(50，311)、1．027(50，222)，晶体结构应属于金属元素的γ—Fe物相。按其所属空间群金属元素的排列方式，确定其原子坐标并计算了理论粉晶衍射图，结果表明，理论粉晶图谱与实测粉晶衍射数据基本一致。该Fe—Cr—Ni合金晶体学参数可归纳为：a＝3．5622A，空间群Fm3m，单位晶胞中的分子数Z＝4，Dc＝8．212g/cm^3。 相似文献
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氟铁云母是三八面体云母类矿物新种,属铁云母的富氟类似物.利用电子探针、湿法和原子吸收分析等手段并结合穆斯堡尔谱分析的结果,按O+OH+F+Cl=12及四面体阳离子数之和为4计算的氟铁云母经验化学式为:(K0.92Na0.03Rb0.02Ba0.01)0.98(Fe1.822++Fe0.493++Al0.19Mg0.18Li0.18Ti0.08Mn0.05Zn0.02)2.99(Al1.17Si2.83)4.00O10(F1.03OH0.50O0.47)2.00.其理想化学式为:KFe32+AlSi3O10F2.使用粉晶XRD衍射仪,采用毛细管装样和超能探测器相结合收集衍射数据/图谱的微区衍射新方法收集氟铁云母的粉末衍射数据,通过构建晶体结构模型和Rietveld法晶体结构精修并收敛到Rp=2.51%,Rwp=3.19%,Rexp=2.85,X2=1.253完成晶体结构解析.矿物属于单斜晶系1M型,空间群C2/m;晶胞参数:a=0.537 05(4)nm,b=0.929 95(6)nm,c=1.017 35(6)nm;β=100.465(5)°,V=0.499 64(5)nm3;Z=2. 相似文献
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钴硅锌矿是一种具有特征深蓝紫色、油脂光泽和玻璃光泽的钴锌硅酸盐矿物,属三方晶系。空间群:C_(3j)~2—R3、a=13.9559A,c=9.3364A,c/a=0.6690,V=1574.8104A~3,Z=18。该矿物理论式为(Zn,Co)_2SiO_4,实验式为:(Zn_(1.26),Co_(O.74))SiO_4。据红外光谱以及X射线粉晶分析,其结构与硅锌矿(Zn_2SiO_4)类似。 相似文献
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4—（2—羟基—4—硝基苯偶氮）—1—苯基—3—甲基吡唑啉酮与钍的显色反应 总被引：4，自引：0，他引：4
在pH为 2～ 3的HAc介质中 ,4 - ( 2 -羟基 - 4 -硝基苯偶氮 ) - 1 -苯基 - 3-甲基吡唑啉酮 (HNAPMP)与钍反应生成 2∶1的稳定络合物 ,λmax=540nm ,ε=4 .96× 1 0 4L·moL- 1·cm- 1,Th质量浓度在 0～ 2 .8mg/L内符合比尔定律。方法用于钍钨合金中钍的测定 ,相对标准偏差 (n =5)小于 1 % ,加标回收率为 97%～ 1 0 2 %。 相似文献
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具一维无公度调制的安康矿的晶体结构测定 总被引：1，自引：0，他引：1
安康矿是在陕西省安康石梯重晶石矿床中发现的一种新矿物。分子式近于Ba_(1·2)(Ti_(5·3)V_(2.8))_(8.1)O_(16),沿C轴具一维无公度调制结构,调制波向量为q=1/2.30C。安康矿的平均结构与锰钡矿是等结构。空间群为14/m,a=10.139(4);b=2.961(2),Z=1。平均结构的强度数据收集是在cAD-4衍射仪上进行的。R=0.039(535个独立的衍射点)。安康矿的超晶胞是将其亚晶胞加大14倍而获得的,空间群P4/m,a=10.126(4),c=41.41(2),Z=14。用RIGAKU的RASA-ⅡS型衍射仪收集了8696个独立的衍射点,其中包括主衍射点及卫星衍射点。对于2353个可观察点经结构修正后R因子为0.2157。在四方柱孔道中测得了Ba原子的占位及位移。测定表明安康矿属占位调制及位移调制的复合型无公度调制,而且沿c轴方向为方波调制。 相似文献
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新矿物——铊明矾 总被引：9，自引：1，他引：9
铊明矾 (lanmuchangite ,TlAl[SO4]2 ·12H2 O)是在贵州滥木厂铊 (汞 )矿床富铊矿体氧化带中发现的一种铊的硫酸盐新矿物。该矿物为产于氧化带的次生矿物 ,其共生矿物为水绿矾、镁铝矾、钾明矾、黄钾铁矾、石膏、自然硫、砷华及某些未知矿物。其矿物集合体大小一般为 2～ 10mm ,集合体多为致密块状 ,单晶呈他形粒状 ,4 0～ 90 μm ,偶见平行柱状集合体 ,半自形至自形柱状晶体 ,直径 15～ 65 μm。白色至淡黄色 ,玻璃光泽 ,透明 ,易溶于水。偏光显微镜下无色 ,均质体 ,实测折光率为 1.4 95。维氏硬度为 94～ 12 4kg/mm2 ,摩氏硬度为 3 .1～ 3 .4 ,实测密度 2 .2 2 g/cm3。平均化学成分 :Tl2 O =3 3 .2 5 % ,Al2 O3=8.0 7% ,SO3=2 5 .19% ,SiO2=0 .10 % ,K2 O =0 .3 5 % ,CaO =0 .0 8% ,MgO =0 .0 6% ,FeO =0 .0 4 % ,H2 O =3 3 .4 6% ,总和 10 0 .60 % ,除结晶水由热重分析 (TG)求得 ( 3件样品平均 )外 ,其余成分均由电子探针分析 ( 6点平均 )求得。化学式为(Tl1.0 0 K0 .0 5) 1.0 5(Al1.0 1Si0 .0 2 Ca0 .0 1Mg0 .0 1Fe0 .0 1) 1.0 6 [SO4]2 .0 2 ·11.86H2 O ,理论式为TlAl[SO4]2 ·12H2 O。X射线粉末衍射主要强线 [d(I,hkl) ]为 :0 .4 3 14 ( 10 0 ,2 2 0 ) ,0 .2 80 1( 70 ,3 3 1) ,0 .70 3 ( 5 4 ,1 相似文献
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新矿物丁道衡矿的晶体结构 总被引：3，自引：1，他引：2
对产于内蒙白云鄂博晶态富Ti和Fe2+的硅钛铈矿族新矿物丁道衡矿Ce4Fe2+(Ti,Fe2+)2Ti2Si4O22进行了晶体结构的精测,求得晶胞参数:a=1.34656(15)nm,b=0.57356(6)nm,c=1.10977(12)nm,β=100.636(2)°,晶胞体积V=0.84239(16)nm3。单位晶胞中的分子数Z=2。晶体结构测定中分别用P21/a和C2/m空间群来进行晶体结构解析,解析表明,两种结构模型最终得到的R因子分别为0.026和0.021。两种结构精修后的原子坐标、键长键角都完全合理。根据结构分析及衍射数据消光规律统计认为,丁道衡矿的空间群应该为P21/a,而C2/m为赝对称空间群,结构属于具有C2/m赝对称的P21/a超结构,是一种超结构的新类型。 相似文献
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多钙钾石膏产于四川省渠县农乐地区中-下三叠统的杂卤石矿层里,与硬石膏一起交。代杂卤石。矿物呈板状,{110}解理中等。比重2.91。折光率:Ng=1.585,Nm=1.5θ8,NP=1.560。二轴晶正,2V=79°。该矿物属单斜晶系。空间群C2/c。晶胞参数:a_0=17.479A,b_0=6.821A,C_0=18.218A,β=113.39°。粉末图的五条强衍射线为:3.01(10)、3.16(8)、3.38(6)、2.83(4)、2.74(3)。根据化学分析计算,其化学式为:K_2SO_4·5CaSO_4·H_2O。结晶水含量2.O4%。文内列出了该矿物的差热(DTA)和热失重(TGA)、红外吸收光谱等新资料。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献