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1.
驾鹿金矿钾长石的结构态与平衡温度及其成矿意义 总被引：2，自引：0，他引：2
笔者对小秦岭驾鹿构造蚀变岩型金矿的钾长石用红外光谱和X射线粉晶衍射法测定其结构态与平衡温度 ,结果如下 :钾长石为微斜长石 -最大微斜长石 ,Al的占位率t1(o) =0 .73～ 1.0 0 ,t1(m) =0 .2 6～ 0 ;t2 (o) =t2 (m) =0 .0 3～ 0 ;晶胞参数a0 =0 .8388～ 0 .86 11nm ,b0 =1.2 837～ 1.2 96 8nm ,c0 =0 .7156～ 0 .72 4 8nm ,α =89.90 6～ 91.0 93° ,β =115.6 50～ 116 .2 30° ,γ=87.50 0～ 89.994° ;三斜度Δ =0 .6 86～ 1.115;平衡温度t =50 3.51～ 578.35℃。因此 ,认为驾鹿钾长石是热液蚀变的产物 ,它调整结构所释放的热量对早期高温阶段的含金热液有影响 ,起着一种活化金络合物的作用 ,不利于金沉淀就位。随着钾长石平衡温度的降低和三斜度的升高 ,这种作用相对更加明显。 相似文献
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氟铁云母——“姑苏城外”发现的新矿物 总被引：2，自引：0，他引：2
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。新矿物产于“姑苏城外”近郊苏州A型花岗岩上部氟铁云母分异岩中。矿物呈自形 -半自形板片状 ;铁黑色 ,半透明。密度 3.18g/cm3(实测 )和 3.2 3g/cm3(计算 )。二轴负晶 ;钠光下测得折光率 :Ng =Nm =1.648,Np =1.596;2V(实测 )≈ 0° ,2V(计算 ) =0° ;Y =b =Nm。矿物多色性强 :Ng棕褐色 ,Nm暗绿色 ,Np浅棕色。由电子探针、湿法和原子吸收分析等手段提供的氟铁云母化学成分均值(wB% ) :SiO2 34 .12 ,Al2 O313.89,FeO 2 6.19,Fe2 O37.86,MgO 1.4 9,MnO 0 .68,Li2 O 0 .4 7,TiO21.2 9,ZnO 0 .2 7,NiO 0 .0 1,K2 O 8.73,Na2 O 0 .19,Rb2 O 0 .4 2 ,CaO 0 .0 2 ,BaO 0 .4 4 ,SrO 0 .0 1,H2 O 0 .91,F 3.91,Cl痕量 ,S 0 .0 0 ,O =F 1.65,总量 99.2 5。按O OH F Cl S =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 .92 Na0 .0 3 Rb0 .0 2 Ba0 .0 1) 0 .98(Fe2 1.82 Fe3 0 .4 9Al0 .19Mg0 .18Li0 .16Ti0 .0 8Mn0 .0 5Zn0 .0 2 ) 2 .99(Al1.17Si2 .83) 4 .0 0 O10 (F1.0 3OH0 .50 O0 .4 7) 2 .0 0 。其理想化学式为 :KFe2 3 AlSi3O10 F2 。氟铁云母属单斜晶系 1M型 ,空间群C2 /m。晶胞参数 :a =0 .5369( 8)nm、b =0 .92 89( 3)nm、 相似文献
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我国几个矿区叶蜡石X射线粉晶衍射研究 总被引：4，自引：0，他引：4
对我国几个主要类型叶蜡石矿的叶蜡石做了X射线粉晶衍射研究。从大量实验结果发现,所研究叶蜡石存在单斜晶系和三斜晶系两种多型。单斜晶系(2M);空间群G_(2h)~6-C2/c,a=5.175A,b=8.902A,c=18.673A,β=100.1°,Z=4;三斜晶系(1Tc):空间群P_c,a=5.162A,b=8.965A,c=9.346A,a=91.2°,β=99.96°,γ=89.91°,Z=2。 相似文献
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祁连山石—一种新的硼碳酸盐矿物 总被引：1，自引：0，他引：1
作者在鉴定青海省居红图硼矿床的矿物标本时发现了祁连山石,经系统测试确定为一种含硼的碳酸盐新矿物,并经国际新矿物及矿物命名委员会批准,现予以报道。祁连山石呈无色透明的板状或柱状晶体,多以集合体产出。矿物具玻璃光泽,硬度约等于2,D=1.706。{100}和{010}解理完全。矿物的化学分子式为NaHCO_3·H_3BO_3·2H_2O。该矿物属单斜晶系,空间群为C2。晶胞常数:a=1.6119 (8),b=0.6928 (4),c=0.6730 (3) nm;β=100.46(4)°,V=0.7390nm~3,Z=4。二轴晶(-),a=1.351(计算值),β=1.459,γ=1.486,2V=50°,光性方位x=b,y∧a=1°,z∧c=9°,中等色散r相似文献
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在西藏扎布耶盐湖中首次发现天然碳酸锂,呈细小棱柱状,单斜晶系,D=2.09±0.01(实测)。无色透明,β平行b轴,光轴面垂直(010),γ∧C=10°,沿(100)具双晶。γ=1.5743±0.001,β=1.5672±0.001,α=1.4285±0.001,2V(-)?25°。经化学全分析配算其化学式为Li_2CO_3。X射线特征线条:4.16(8)、2.92(8)、2.81(10)。α_0=0.835±0.0003nm,b_0=0.4964±0.001nm,c_0=0.6185±0.0009nm, 相似文献
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盈江铀矿的新资料 总被引：3，自引：0，他引：3
本文第一次提供了由单晶X射线衍射分析测定的盈江铀矿的空间群和晶胞参数。该矿物产于广东省下庄铀矿田。斜方晶系,空间群Bmmb(63),a=15.707(3),b=17·424(3),c=13.692(2)?,V=3747?~3,Z=4。Dc=4.60g/cm~3,Dm=4.54g/cm~3。化学式:(K_2,Ca)(UO_2)_7(PO_4)_4(OH)_6·6H_2O。二轴晶,负光性。2Vc=36°,2Vm=36—38°。Ng=1.707(2),Nm=1.703(2),Np=1.666(1)。光性方位:Ng//Y,Nm//X,Np//Z。 相似文献
8.
无色透明的人造 Zn(Zn_(0.1)Li_(0.6)Si_(0.3)SiO_4的室温形体(a)具有单斜对称,a=6.340(1),b=10.516(2)、C=5.011(1)A,β=90.50(2)°,空间群 P2./n,Z=4。大约在400℃,转变为斜方晶系的高温形体(β),a=6.406(3),b=10.520(8),C=5.043(2)(?),空间群 Pmnb,Z=4。根据室温和450℃的×—射线强度数据,用三维图象分析法,确定了两种形体的晶体结构。用最小二乘法分别按照最终加权 R=0.068(未加权的 R=0.068)和0.064(未加权的 R=0.070)精选了室温和高温结构。高温结构是一种具有共用系数为3的四面体架状结构。有两种不同的四面体位置:T_1,8次配位位置;T_2,4次配位位置。T_1位置包含了全部的 Zn 和 Li 以及某些 Si;T_2位置全部是 Si。T_1四面体构成平行于(010)的折曲层,这种层是由共顶角的四面体链组成,这些链是平行于[100]的。与辉石族矿物不同,所有四面体都位于链轴的同一侧。这些层按反向平行排列堆积,并由 T_2四面体将这些层交叉连接而组成架状结构。在低于转换温度条件下,8次配位的 T_1位置变为两种独立对称的4次配位位置 T_1(0)和 T_1(m),其对称从 Pmnb 变为 P_2_1/n。Zn 原子在 T_1(0)是完全有序的。转变时,Zn 原子可能集中在两种 T_1位置的某一位置。这种择位的结果就产生一种晶畴结构,其中具有两种通过交切(100)的反射而彼此联系的配位位置。有序——无序转变也产生双晶(a′)结构,这种结构具有单斜对称,空间群 B_2_,a=13.01,b=10.41,C=10.07(?),β≈90°。 相似文献
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草莓红“绿柱石”的晶体化学研究 总被引：5，自引：2，他引：3
利用扫描电镜 能谱仪(SEM EDS)、电子探针(EPMA)、高分辨等离子质谱仪(HR ICP MS)和X 射线单晶衍射仪等方法,对一种新的含高铯矿物进行了分析,发现其成分、结构和光学特征等均异于常见的含Cs绿柱石(Morganite)。它是一种含高铯属三方晶系的、新发现的宝石矿物,称此宝石矿物为草莓红"绿柱石"(Rasp berry"Beryl")。晶体化学式为:(Cs0 627Na0 095K0 041Rb0 031Ca0 028)0 822(Be2 099Li0 869)2 968(Al1 964Fe0 010)1 974Si6 040O18。晶胞参数a=1 59735nm,c=2 78444nm,α=β=90°,γ=120°,V=6 15274nm3。折射率No=1 615～1 616,Ne=1 607±,双折射率为0 008～0 009,S G 为3 00～3 10。 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
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
13.
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
14.
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