共查询到20条相似文献，搜索用时 62 毫秒
1.
运用X射线衍射、红外光谱及固体高分辨核磁共振等手段,研究了苏州高岭石560～1600 ℃热变产物,结果显示:①高岭石-偏高岭石-莫来石的转变系列存在结构上的连续性,其转变经历了脱羟阶段(约400～600 ℃),偏高岭石阶段(600～800 ℃),相分离阶段(800～1100 ℃),莫来石阶段(1100～1600 ℃);②莫来石形成过程没有出现Al2O3的大量分凝,但存在SiO2的分凝;③偏高岭石-莫来石转变过程的中间相为Al-Si尖晶石和准莫来石;④引起1000 ℃放热反应的主要因素是SiO2的大量分凝,其次是准莫来石等过渡相的形成. 相似文献
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高岭石热转变产物^29Si、^27Al魔角旋转核磁共振研究 总被引：19，自引：2，他引：19
运用魔角旋转核磁共振结合红外光谱及X射线衍射等手段，研究了苏州高岭石的560－1600℃热转变产物，主要获得以下结论：（1）高岭石－偏高岭石－莫来石的转变系列的确存在结构上的连续性。其转变经历了几个阶段；脱羟阶段（400－600℃），偏高岭石阶段（600－800℃），相分离阶段（800－1100℃），莫来石阶段（1100－1600℃）。（2）莫来石形成过程没有出现Al2O3的大量分凝，但存在SiO2的分凝。（3）偏高岭石－莫来石转变过程的中间相为Al-Si尖晶石和准莫来石。（4）引起1000℃放热反应的主要因素是准莫来石的形成。 相似文献
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高岭石热转变产物~(29)Si、~(27)Al魔角旋转核磁共振研究 总被引：1，自引：0，他引：1
运用魔角旋转核磁共振结合红外光谱及X射线衍射等手段 ,研究了苏州高岭石 5 60～ 160 0℃热转变产物 ,主要获得以下结论 :①高岭石 偏高岭石 莫来石的转变系列的确存在结构上的连续性。其转变经历了几个阶段 :脱羟阶段 ( 4 0 0～ 60 0℃ ) ,偏高岭石阶段 ( 60 0～ 80 0℃ ) ,相分离阶段 ( 80 0～ 110 0℃ ) ,莫来石阶段( 110 0～ 160 0℃ )。②莫来石形成过程没有出现Al2 O3的大量分凝 ,但存在SiO2 的分凝。③偏高岭石 莫来石转变过程的中间相为Al Si尖晶石和准莫来石。④引起 10 0 0℃放热反应的主要因素是准莫来石的形成。 相似文献
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煅烧温度对高岭石相转变过程及Si、Al活性的影响 总被引：9，自引：0，他引：9
通过对吉林通化煤系高岭石和美国Georgia高岭石在200～1300℃热处理产物的MASNMR谱和XRD,IR,DTA等的研究,主要获得如下结论：①煅烧高岭石的相转变经历了四个阶段——脱羟阶段（约550℃）,偏高岭石阶段（550～850℃）,SiO2分凝（850～1100℃）及Al2O3分凝阶段（950～1100℃）,莫来石、方英石形成阶段（1100℃以上）;②偏高岭石-莫来石的相转变过程中存在SiO2和Al2O3的分凝,其中SiO2的分凝温度是850℃,而Al2O3的分凝温度是950℃;③1100℃开始,由偏高岭石分凝形成的非晶质SiO2一部分和Al2O3-γ发生反应生成了莫来石,一部分结晶为方英石;④煅烧高岭石Si、Al活性总体上随着煅烧温度的增高逐渐增强,其中Al的活性在900℃时达到最高,Si在1100℃时达到最高,当温度超过这两个临界点时,Si、Al活性将迅速下降。 相似文献
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高岭石—莫来石反应系列：^27Al和^29SiMAS NMR研究 总被引：21，自引：2，他引：21
根据艰我国八个不同成因和特征的高岭土样品在４５０－１４５０℃热处理产物的ＭＡＳ ＮＭＲ谱和ＸＲＤ，ＩＲ，ＤＴＡ等研究结果，结合有关资料讨论了高岭石－莫来石反应序列的几个重要问题：１．高岭石的结构，尤其是五配位铝；２．９８０℃放热峰后的高温相是γ－Ａｌ２Ｏ３而不是Ａｌ－Ｓｉ尖晶石；３．对于莫来石化过程，认为初始莫来石８５０－９５０℃变高岭石形成，二次莫来石由分凝的ＳｉＯ２和γ－Ａｌ２Ｏ３在１２００－ 相似文献
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高岭石插层复合物作为新型矿物材料现已被广泛应用。然而,插层复合物热稳定性较难控制使其在聚合物中的应用一直受到限制。本文应用热分析、X射线衍射、质谱及发射红外光谱等表征技术对煤系高岭石/醋酸钾插层复合物受热分解产物及微结构变化进行了研究。结果表明,煤系高岭石/醋酸钾插层复合物热相变主要经历以下几个阶段:插层水脱嵌(约350℃),插层剂醋酸钾脱嵌(约400℃),脱羟基(约450℃),偏高岭石形成(450~550℃),KHCO3出现(约600℃),KHCO3热分解形成K2CO3和KAl Si O4出现(约700℃),热解产品K2Al2Si O4出现(约800℃),K4Al2Si2O3出现(900~1000℃),大量K3Al O3形成阶段(1100℃及以上)。此外,还发现通过控制插层率和加热温度,可实现高岭石插层复合物的可控分解、新物相合成与转变,从而有利于新材料的合成。 相似文献
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偏岭石及煅烧高岭石的红外光谱研究 总被引：3，自引：0，他引：3
通过对偏岭石和相应煅烧高岭石的红外光谱测定,发现偏岭石同煅烧高岭石在结构上有很大的差异。在偏岭石中不存在非晶态SiO_2相,其中Si—O_4四面体同Al—O_6八面体是相互聚合的:煅烧高岭石(600～995℃)中则不同,其中Si大部分是以独立的非晶态SiO_2相存在,而同其中的Al_2O_3相分离。偏岭石同煅烧高岭石的关系是:对偏岭石进行一定温度的煅烧,它可以转变成像煅烧高岭石一样的结构状态。 相似文献
8.
叶蜡石高温相转变的实验研究 总被引：1，自引：0，他引：1
通过差热分析、X射线衍射分析、红外光谱分析和魔角旋转核磁共振等测试手段,研究了日本广岛胜光山叶蜡石在20~1 300 ℃下煅烧的相转变过程。结果表明,叶蜡石的高温相转变经历了4 个阶段:叶蜡石阶段(室温~662 ℃),偏叶蜡石阶段(662~1 100 ℃),不定形SiO2 与莫来石形成阶段(1 100~1 200 ℃)和莫来石与方石英共存阶段(1 300 ℃~)。叶蜡石在662 ℃时失去结构水转变为偏叶蜡石。偏叶蜡石从1 100 ℃开始转变为莫来石,同时伴随有不定形SiO2 生成。1 300 ℃时,不定形SiO2 进一步结晶形成方石英。 相似文献
9.
偏岭石及其有关的变高岭石过去用一般鉴定结晶矿物的ｘ射线衍射分析定为“非晶质”矿物；后来刘长龄用ｘ射线衍射分析粉末照相高功率长时间拍照，见到有中、低强度的衍射线条（背景发暗）．４～４．１（弥散）等多条（偏岭石）；４．４及２．２等（变高岭石），二者有区别（灵敏度高的ｘ射线衍射仪强度曲线分析也有不同（图１），而均属于准晶质或半晶质。今后再鉴定为“非晶质”矿物，不符合事实，显然是错误的。又偏岭石及变高岭石的光学性质等也不是“非晶质”，而具有强非均质性及２Ｖ［１］［２］． 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.
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
13.
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