共查询到20条相似文献，搜索用时 109 毫秒
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辉锑锡铅矿是一种复杂的Pb-Sn-Sb硫盐矿物,化学组分变化大,结构复杂。前人对此做了不少工作,但仍未能查明该矿物的晶体结构和晶体化学性质。辉锑锡铅矿含有两种主要的穆斯堡尔元素Sn和Fe,穆谱研究可为该矿物提供重要信息。一些作者曾对产自玻利维亚和苏联的辉锑锡铅矿作过穆谱研究,但在Sn、Fe的价态和谱线等问题上 相似文献
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作者在辉锑锡铅矿-硫锑锡铁铅矿-potosiite以及圆柱锡矿两个固溶体系列的实验研究基础上,合成出铅全部被二价锡取代生成的无铅端员——无铅辉锑锡铅矿和无铅圆柱锡矿。并进一步在Fe-Sn-Sb-S体系内确定了第三个相——含铁、锑的斜方硫锡矿固溶体相的存在。无铅辉锑锡铅矿和无铅圆柱锡矿作为纯相只能在高温下被合成。铁锑斜方硫锡矿虽然也可以在600℃被合成,但在500℃以下,它在更广泛的范围内存在。文章也涉及到无铅的SnS-SnS_2-FeSb_2S_4假三元系内相的关系,即600℃时所观察到的随四价锡增加而依次出现的相及相的共生。 相似文献
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李九玲 《矿物岩石地球化学通报》1987,(3)
作者以硫化物合成实验手段为主,配合X射线粉晶衍射及反光显微镜鉴定、穆斯鲍尔谱价态分析、高温差热分析,并密切结合对天然矿物辉锑锡铅矿、圆柱锡矿的成分分析、矿物共生组合及天然矿物加热实验研究,成功地合成出辉锑锡铅矿和圓柱锡矿,研究了其中元素代换规律,解决了矿物学中这组复杂硫盐矿物长期以来悬而未决的一些问题,得到以下几点关键性突破。 (1)确定了辉锑锡铅矿和圆柱锡矿的化学组成,它们是由不同的硫锑酸根-硫锡酸根(Sn~(4+))以及二价铅、锡、铁组成的硫盐矿物。 相似文献
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龚国洪 《矿物岩石地球化学通报》1992,(4)
铅圆柱锡矿(potosiite)是1981年在玻利维亚的锡矿床中发现的,沃尔夫等人测定了它的化学成份和X射线粉晶衍射数据,作为新矿物列入JCPDS卡片。近年来作者在工作中发现,实际上该矿物旱在1972年就被我国地质工作者在广西大厂的锡石硫化物矿床中采集,由于该矿物的物理性质与辉锑锡铅矿的物理性质极为相似,以及限于当时的实验条件而误定名为辉锑锡铅矿。为便于今后的工作,作者认为育必要对铅圆柱锡矿和辉锑锡铅矿进行重新认识。 相似文献
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辉锑锡铅矿是结构复杂而尚未确定,以及晶体化学尚有争议的一种稀有矿物。X射线衍射结果表明其结构是由假四方亚层(称T层)和假六方亚层(称H层)穿插组成的层状结构。T层的化学成分具有MeS形式,H层则具有MeS_2形式。本文通过广西大厂的辉锑锡铅矿的穆斯堡尔谱研究,确定了矿物中Sn的大部分为Sn~(4+),而Sn~(2+)只占较少的部分;Fe中含有Fe~(3+)和Fe~(3+)。它们在T层和H层中的分布为Sn~(2+)(T)占5.6%,Sn~(4+)(T)占25.9%,Sn~(4+)(H)占68.5%,Fe~(2+)(T)占59.5%,Fe~(3+)(H)占40.5%。从Sn、Fe的穆斯堡尔谱参数还可看出H层的共价性比T层的强。 相似文献
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用抽空石英管法研究以Fe_(0·96) Sb_(2·04) S_(4·12)为投影顶点,8×(PbS-SnS-SnS_2)为投影平面的Pb-Sn-Fe-Sb-S体系的相图表明,由于Pb(?)Sn~(2+)之间互相取代,500℃时辉锑锡铅矿固溶体中Sn~(2+)变化范围(以单位分子式11个金属原子总数为计量)是0—4.8个原子,400℃时则为0—4.0个原子。同时,Sn~(4+)变化范围是1.3—2.3个原子和1.5—2.1个原子。圆柱锡矿固溶体变化范围较小。500℃时Sn~(2+)变化范围是0.4—1.8个原子,400℃时为0.5—1.7。Sn~(+4)变化范围则分别为3.2—4.2个原子和3.3—4.2个原子。变更Fe含量(0.81—1.09)及Sb含量(1.83—2.29)进行的几组合成实验表明,上述两个矿物中Fe、Sb含量变化范围很小,不超过±0.15个原子。辉锑锡铅矿固溶体可与方铅矿、块硫锑铅矿、针硫锑铅矿、硫锡铅矿、硫锡矿、圆柱锡矿等形成平衡结线。而圆柱锡矿不与方铅矿、硫锡矿、硫锡铅矿形成平衡结线,但可与辉锑矿、SnS_2及上述其他矿物形成平衡结线。结合锡的硫化物及氧化物(锡石)热力学稳定场计算表明,在本体系内辉锑锡铅矿在300℃时稳定区的硫活度在lga_(s2)=-20(atm)附近,氧活度小于lga_(o2)=-40(atm),而圆柱锡矿稳定区硫活度大于lga_(s2)=-10(atm)。 相似文献
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本文对我国一些地区的锡石、黄锡矿、辉锑锡铅矿等锡矿物样品进行了化学成分分析、穆斯堡尔谱测试,并利用穆斯堡尔谱方法区分了这些锡矿物中锡的价态。实测结果表明,锡石中的锡全是Sn~(4+)(六配位),黄锡矿中的锡是Sn~(4+)(四配位),辉锑锡铅矿中的锡有Sn~(4+)及少量 的Sn~(2+)。钙铁榴石中的锡是Sn~(4+),它是以类质同像替换方式进入[Y]位替换Fe~(3+)。同时,讨论了同质异能位移值与价态的关系,I.S值的增大顺序为:Sn~(4+)→Sn~0→Sn~(2+)。根据经验公式,估算了一些锡矿物中氧和硫配位基的电负性, 相似文献
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目前,我国金属矿床中见到铋硫盐矿物共４６种,其中有８种未定名矿物。在ＰｂＳ＿Ｂｉ２Ｓ３系列矿物中,实验矿物学（Ｌ．Ｌ．Ｙ．Ｃｈａｎｇ）上已有的１０种ＰｂＳ－Ｂｉ２Ｏ３系列矿物,即由富硫铋铅矿→硫铋铅矿→针辉铋铅矿→柱辉铋铅矿→斜方辉铋铅矿→卡辉铋铅矿→辉铋铅矿→杂硫铅铋矿→斜方硫铋铅矿→柱硫铋铅矿,我国应有尽有外,还发现有４种ＰｂＳ－Ｂｉ２Ｓ３的未定名的矿物。块辉铋铅银矿中暂定的３个亚各,我 辄全 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