共查询到20条相似文献，搜索用时 46 毫秒
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运用透射电镜技术，发现了三方晶系直氟碳钙铈矿（Synchysite）多型和微孪晶的存在，确定其中的多型有两种，即6R和3R多型，在3R多型中发现有微孪晶存在，这种微孪晶属（0001）孪晶面的面律（旋转）孪晶。由于直氟碳钙铈矿是钙铈氟碳酸盐系列矿物的一个端员组分，因此，对其多型和微孪晶的研究，有助于揭示该系列中间组分矿物多型和微孪晶的形成机理。 相似文献
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四川昌北稀土矿床中的硅钛铈矿 总被引：4，自引：2，他引：4
1986年笔者在四川昌北稀土矿床中发现一种结晶完好的硅钛铈矿。矿物物理性质与我国白云鄂博产出者相似。矿物组分中富铌。晶体化学式为(Ce,La,Nd…Ca)_4Fe~(2+)(FeTiNb)_2Ti_2O_8[Si_2O_7]_2。经四圆单晶衍射和电子衍射测得晶胞参数相同,α=13.385(2),b=5.742(1),c=10.059(2),β=100.60(0.01)°,空间群C 2/m。对矿物晶体定向带轴进行了高分辨晶格象观测。 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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《吉林大学学报(地球科学版)》2015,(Z1)
<正>橄榄石是上地幔最重要组成矿物之一,其在高压下电学性质得到了广泛的关注[1-3]。本次工作,在4.0 GPa和573~1373 K条件下,采用多面顶高压设备和Solartron-1260阻抗/增益-相位分析仪,原位测量了沿[100]、[010]和[001]三个不同晶向的含水的San Carlos单晶橄榄石电导率[4]。实验结果表明:(1)在高温高压下原位测量了沿[100]、[010]和[001]三个晶向上含水的橄榄石电导率,发现低温段 相似文献
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陨铬辉石是一种硬玉旅的钠铬辉石。已经在四种亮绿色不透明的缅甸玉的样品中测试出来了。它是一种细纤维状集合体,与闪石、铬铁矿和其它矿物共生;其比重是3.51—3.52和密度为3.55g/Cm~3;它有很强的多色性(黄-绿)和二轴晶正光性( ),2V=70°,α=1.722,β=1.734,γ=1.745,穆斯堡尔谱表明铁仅为三价的。由X—射线粉晶衍射计算出的晶胞参数为a=9.533,b=8.678,C=5.265A,β=107.49经电子探针分析,它的化学成分是复杂的,且含铝和铁,陨铬辉石的分子式可写为:(Na0.93Ca0.02)0.95(Cr0.69Al0.17Fe0.10Mg0.03)0.69[S12.02O6] 相似文献
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新疆罗布泊地区水硝碱镁矾和钠硝矾的矿物学研究 总被引：3，自引：0，他引：3
本文报道了我国新发现的两个硝酸盐-硫酸盐复盐矿物——水硝碱镁矾和钠硝矾。水硝碱镁矾呈假四方双锥状,属三方晶系,解理{0001}完全,一轴负晶,折光率为ω=1.474,ε=1.436:晶胞参数α=1.0894nm,c=2.4396nm,粉晶图的强衍射线为:2.813(100),8.096(19)1.991(18),3.391(10),2.199(8),8.751(8)。钠硝矾为板状,板柱状,解理{010}完全,{100}不完全。聚片双晶平行(100),二轴负晶,折光率为:α=1.487,β=1.481,γ=1.391;-2V=28°。矿物属单斜晶系,晶胞参数为:α=1.0565nm,b=0.6922nm,c=0.5194nm。粉晶图的强衍射线为:10.3(100),3.46(35),2.594(30),2.871(30),2.856(30),4.13(20)。文中还列出了两矿物的差热和红外吸收光谱等资料。 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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叶腊石微结构及其晶体结构缺陷的高分辨透射电镜分析 总被引：2，自引：0，他引：2
采用场发射扫描电镜（FE-SEM）、高分辨透射电镜（HRTEM）结合选区电子衍射（SAED）、X射线粉晶衍射（XRD）及X射线荧光光谱（XRF）等对浙江青田叶腊石的微结构特征进行较系统的研究。结果表明：①粉晶X射线衍射证实青田叶腊石具有典型的单斜晶系特征,该结论与叶腊石粉体选区电子衍射结果吻合,且其伴生矿为石英。②叶腊石微晶体呈＂复式板片＂构型,且＂复式＂板片中薄片厚度约为8±2 nm。③在高能电子束辐照下,叶腊石矿物颗粒形貌及晶格结构发生明显的改变,且由此产生晶格膨胀,并最终形成非晶态。 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