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Influence of Clay Minerals on Some Soil Fertility Attributes: A Review 预览
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作者 Georges Kogge Kome Roger Kogge Enang +1 位作者 Fritz Oben Tabi Bernard Palmer Kfuban Yerima 《土壤科学期刊(英文)》 2019年第9期155-188,共34页
Clay minerals constitute an important component of the soil system and knowledge of their role in soil fertility is imperative for sustainable soil management and productivity. The aim of this work is to overview the ... Clay minerals constitute an important component of the soil system and knowledge of their role in soil fertility is imperative for sustainable soil management and productivity. The aim of this work is to overview the influence of clay minerals on some major soil fertility attributes. The rationale for carrying out this work is that most soil fertility studies rarely incorporate soil mineralogy. Clay minerals, through their physical and chemical properties, affect soil fertility by controlling nutrient supplies and availability, through the sequestration and stabilization of soil organic matter, by controlling soil physical properties through microaggregate formation, by influencing soil acidity and controlling soil microbial population and activity. The main processes involved in these relationships are dissolution-precipitation and adsorption-desorption processes, alongside mechanisms involving the formation of short-range-ordered phases. Although the determination of soil mineralogical properties is very costly and time-consuming, information about a soil’s mineralogy is imperative for a holistic understanding and proper management of soil fertility. Therefore, the development of rapid, low-cost, reliable and efficient techniques of soil mineralogical analysis, directly applicable to soil fertility investigations, constitutes a major challenge. Also, future research should investigate the relationships between clay minerals and soil nitrogen vis-à-vis sequestration and stabilization. Lastly, clay minerals should be considered in studies dealing with soil quality assessment, especially in the choice of soil quality indicators. 展开更多
关键词 Clay MINERALOGY NUTRIENT Supply Ion ADSORPTION-DESORPTION Mineral Dissolution-Precipitation NUTRIENT AVAILABILITY
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Clay minerals in the late Quaternary sediment of Tulare Lake, California: Implications for climate change, weathering, and erosion processes 预览
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作者 Junhua Guo Christine Pyles +1 位作者 William Krugh Rob Negrini 《国际泥沙研究:英文版》 SCIE 2019年第5期432-443,共12页
The clay mineralogy of Tulare Lake sediment was examined to investigate hydroclimatic and environmental changes in the southern Sierra Nevada Mountains (SNM) since the most recent glacial maximum. Evolution of clay mi... The clay mineralogy of Tulare Lake sediment was examined to investigate hydroclimatic and environmental changes in the southern Sierra Nevada Mountains (SNM) since the most recent glacial maximum. Evolution of clay mineral assemblages elucidates significant changes in weathering, erosion, and hydroclimatic condition in the catchment. During the last glacial period (24.4–15.1 cal ka BP), low illite content implies less physical erosion of the granitic batholith rocks and a cold and arid environment in the southern SNM. Abrupt increases of illite content at 21.8–20.8 and 17.6 cal ka BP resulted from the glacier advances to the ablation zone and illite-rich glacier flour was transported down to the lake. The gradual increase of smectite induced by progressive depletion of illite-rich glacier flour from 17.6 cal ka BP toward the end of this period indicates climate was beginning to get warm and wet. From 11.9 to 5.3 cal ka BP, two warm and wet periods (10.7–9.4 and 8.2–5.2 cal ka BP) were characterized by high smectite/illite content ratios and low illite crystallinity values, suggesting intensive rainfall precipitation and more physical erosion in the highland and lowland catchment as well as more smectite formation in the terrace soils. Since the last glacial period, physical erosion, in comparison to the chemical weathering, was the dominant process responding to the hydroclimatic change in the Tulare Lake catchment. Moderate to weak chemical weathering was signified by the mostly low illite chemical weathering index of the core sediments. Such results suggest that vegetation cover in the southern SNM was low and limited. 展开更多
关键词 CLAY MINERALOGY Sierra NEVADA MOUNTAINS Glaciers WEATHERING Tulare LAKE
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Characterization and Evaluation of the Potential Uses of Mouyondzi Clay 预览
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作者 Joseph Marie Moutou Paul Mozalin Foutou +3 位作者 Laurent Matini Vivien Banzouzi Samba Zita Flora Diamouangana Mpissi Raunel Loubaki 《矿物质和材料特性和工程(英文)》 2018年第1期119-138,共20页
The overall goal of this study is to characterize and to evaluate the potential uses of clay mined in the Nzaou locality. The Mou sample is argillaceous texture and medium plasticity (Ip = 28.9). Kaolinite is dominant... The overall goal of this study is to characterize and to evaluate the potential uses of clay mined in the Nzaou locality. The Mou sample is argillaceous texture and medium plasticity (Ip = 28.9). Kaolinite is dominant clay species (44.41%). It is associated with illite (9%). Quartz and rutile are the main non clay minerals. The CEC is 8.66 cmol+/kg. Organic matter is low (0.839%). Total shrinkage obtained by dilatometry at 1200&degC is 9.26%. The chemical and mineralogical compositions have allowed using the ternary diagrams of Fabbri and Fiori that the MOU clay is favorable for glazed white stoneware (GWS) and for the production of clinker (KLK). Dondi typologies of ceramic tiles according to body color (mostly depending on the iron oxide content) and compactness (expressed by water absorption) have confirmed the use for the manufacture of the GWS and clinker. Classification always according to Dondi taking into account the rate of kaolinite, the fine fraction (&degC will be vitrified. Flexural strength at 1200&degC (16 MPa) does not correspond to the requirements of GWS or a clinker. 展开更多
关键词 Mouyondzi CLAY MINERALOGY TECHNOLOGICAL PROPERTIES POTENTIALITY CERAMIC Tiles
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Mineralogical and Physicochemical Characterization of Clay in the Sangaré-Paul Locality (North Cameroon), in Order to Assess the Potential Use in the Field of Ceramics 预览
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作者 Mominou Nchare Essimi Onana Bonaventure Desire +1 位作者 Wang Lei Badohok Sarki 《无机化学期刊(英文)》 2018年第3期71-80,共10页
The clay in the locality of Sangaré-Paul referred to as SP, has been the subject of a mineralogical and physical characterization in order to assess the potential use in the field of ceramics. Firing experiments ... The clay in the locality of Sangaré-Paul referred to as SP, has been the subject of a mineralogical and physical characterization in order to assess the potential use in the field of ceramics. Firing experiments were carried out on experimental briquettes at temperatures of 900°C, 1000°C and 1100°C after which physical tests and mineralogical analyzes were made on the cooked products. The results obtained from the mineralogical analyses show that the clay in the locality of Sangaré-Paul contains kaolinite, illite, quartz and feldspar, and when cooked, the presence of a new crystal phase is detected. From the granulometrical and physical tests, the material has a particle size spread with a plasticity index greater than 20%. Its activity is less than 0.75. It is kaolinite sandy clay with a low plasticity. The hydrogen potential (pH) measurement shows the weakly basic character of this clay. The technological parameters of experimental briquettes show that the percentage of water absorbed is less than 15%. The linear withdrawal of all experimental briquettes presents values less than or equal to 10%. The values of the mechanicals resistances of the briquettes increase globally with the temperature not exceeding 10 MPa for the bending, but reaching 38 MPa for the compression. All these parameters, except the linear withdrawal, present optima temperature at 1100°C. The clay material of Sangaré-Paul is suitable for the manufacture of bricks and tiles at 1100°C. 展开更多
关键词 Sangaré-Paul CLAY MINERALOGY Ceramic
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Effects of environmental factors on classification of loess-derived soils and clay minerals variations, northern Iran
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作者 Mohammad AJAMI Ahmad HEIDARI +2 位作者 Farhad KHORMALI Manouchehr GORJI Shamsollah AYOUBI 《山地科学学报:英文版》 SCIE CSCD 2018年第5期976-991,共16页
Land-use type under different topographic conditions and human activities affects soil development. We investigated the effects of land-use, topography and human activity on soil classification changes in the Toshan w... Land-use type under different topographic conditions and human activities affects soil development. We investigated the effects of land-use, topography and human activity on soil classification changes in the Toshan watershed in northern Iran. Seven representative pedons derived from loess parent materials were studied on different land-uses and topographic positions. The studied pedons in forest (FO) on backslopes and footslope were classified as Calcic Haploxeralfs and Typic Haploxeralfs, respectively. The soils in abandoned lands (AB) and orchards (OR), where formerly under natural forests, located on the shoulder and baekslopes positions were classified as Calcic Haploxeralfs and Vertic Haploxeralfs, respectively. Well-developed argillie horizons as indicators for higher degrees of soil evolution were observed in more-stable areas under the natural forest or less disturbed areas. Clay lessivage through these soil profiles have led to formation of Typic or Calcie Haploxeralfs, while under croplands (CP) were classified as Typic Calcixerepts. Conversion of sloping deforested areas to CP along with inappropriate management have accelerated soil erosion, resulting in unstable conditions in which decalcification and formation of developed soils cannot occur. Paddy cultivation in flat areas has caused to reduced conditions and formation of Typic Haplaquepts. Because of unfavorable conditions for chemical weathering (e.g. lower water retention compared to more-stable areas) no vermiculite was detected in the CP. The results showed that evolution and classification of the studied soils were strongly affected by land-use type, topography and management. 展开更多
关键词 Soil CLASSIFICATION CLAY MINERALOGY Land-use change TOPOGRAPHY LOESS
风化成土过程中自生矿物的气候指示意义 被引量:5
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作者 方谦 洪汉烈 +3 位作者 赵璐璐 程峰 殷科 王朝文 《地球科学》 CSCD 北大核心 2018年第3期753-769,共17页
地球表层的土壤沉积物记录了第四纪以来与气候、环境、人类等有关的地球演化信息,是重要的研究过去历史的载体.成土体系中土壤的诸多特性都与成土期的气候环境信息息息相关,通过地质学研究方法可以提取某些特性并作为反演风化强度以及... 地球表层的土壤沉积物记录了第四纪以来与气候、环境、人类等有关的地球演化信息,是重要的研究过去历史的载体.成土体系中土壤的诸多特性都与成土期的气候环境信息息息相关,通过地质学研究方法可以提取某些特性并作为反演风化强度以及古气候的风化指标,即古气候替代指标.重点讨论了成土体系中新生的矿物学风化指标——粘土矿物与铁矿物的表征意义、研究方法与实例分析,并评述了其在反演气候方面的优势与局限性.成土作用中新生的粘土矿物直接受成土期盛行的环境与气候条件的影响,所以其组成、粒度、含量、结晶度等矿物学特征充分记录了成土期的气候与环境信息.另外,成土体系中也会新生成部分铁矿物.自生的铁矿物是反映成土期的湿度条件、温度范围的有效指标,因此对当时的气候演化历史也有很好的指示意义.粘土矿物与铁矿物在一定的条件下都可以作为独立的重建古气候的替代指标,但是在使用时要充分考虑研究区域的地质背景、物源供给、气候类型、风化条件等客观局限对这些风化指标的制约.另外,对于区域内风化程度及古气候的重建,通常多指标结合对比的方法更为可靠. 展开更多
关键词 成土作用 化学风化 粘土矿物 铁矿物 第四纪气候 矿物学
新疆北部地区与其他地区变性土壤线性膨胀系数的差异及矿物学机制 预览 被引量:1
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作者 张佩佩 张文太 +3 位作者 贾宏涛 姜小三 武红旗 朱磊 《南京农业大学学报》 CSCD 北大核心 2017年第6期1074-1080,共7页
[目的]比较不同亚纲变性土之间线性膨胀系数的差异,并通过对比不同亚纲土壤物理属性,解释产生差异的内在机制。[方法]新疆北部地区(简称北疆地区)是夏旱变性土(含变性土壤)主要分布区,本研究调查了具有变性特征的14个土壤剖面,... [目的]比较不同亚纲变性土之间线性膨胀系数的差异,并通过对比不同亚纲土壤物理属性,解释产生差异的内在机制。[方法]新疆北部地区(简称北疆地区)是夏旱变性土(含变性土壤)主要分布区,本研究调查了具有变性特征的14个土壤剖面,并搜集了我国其他12个省市140个变性土剖面相关数据,分析了不同亚纲变性土的线性膨胀系数(coefficient of linear extensibility,COLE)、黏粒和蒙皂石含量及其相关关系。[结果]北疆地区夏旱变性土(含变性土壤)的COLE、黏粒和蒙皂石含量在5个亚纲中最低,其土壤膨胀收缩特性主要受伊利石一蒙皂石混合型矿物组成和混层比的影响,而其他4个亚纲较夏旱变性土(含变性土壤)具有更明显的变性特征。潮湿变性土、湿润变性土和夏旱变性土(含变性土壤)0-100cm土层的黏粒和蒙皂石含量大于0-30cm土层,而干润变性土0~30cm土层含量高于0~100cm土层。寒变性土随着剖面深度的增加,黏粒和蒙皂石含量无明显变化。潮湿变性土0~100cm土层蒙皂石含量显著高于干润变性土和夏旱变性土(含变性土壤),且0~100cm土层的COLE值也显著高于夏旱变性土(含变性土壤),5个亚纲表层土壤的COLE差异不显著。随着黏粒含量的增加,干润变性土蒙皂石含量和潮湿变性土COLE随之增大,表层蒙皂石含量对COLE影响更大。[结论]北疆地区蒙皂石和伊利石一蒙皂石混合型矿物组成是土壤变性的内在影响因素,变性土中蒙皂石与黏粒呈线性相关,黏土矿物组成对表层土壤膨胀收缩有决定性作用。 展开更多
关键词 混层比 黏土矿物组成 伊利石-蒙皂石混层 黏粒 线性膨胀系数 新疆北部地区
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河南某含锂粘土矿工艺矿物学研究 预览
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作者 李荣改 宋翔宇 +2 位作者 徐靖 王守敬 李彦令 《矿产保护与利用》 2014年第6期38-41,共4页
为了查明河南某地含锂粘土矿的工艺矿物学性质,通过X射线衍射、红外光谱分析和电子探针等手段,对该含锂粘土矿进行了详细的工艺矿物学研究,结果表明,矿石中的锂主要为锂绿泥石,其粒度微细,且多与粘土矿物等成分混杂,局部可见锂... 为了查明河南某地含锂粘土矿的工艺矿物学性质,通过X射线衍射、红外光谱分析和电子探针等手段,对该含锂粘土矿进行了详细的工艺矿物学研究,结果表明,矿石中的锂主要为锂绿泥石,其粒度微细,且多与粘土矿物等成分混杂,局部可见锂绿泥石聚集呈团状,扫描电镜分析结果显示锂绿泥石集合体中包裹有大量的一水硬铝石等杂质矿物,以上原因造成矿石中锂绿泥石很难通过选矿方法富集。根据矿石的结构构造特征建议对矿石采用全岩浸出的方案提取矿石中的锂元素。 展开更多
关键词 含锂粘土矿物 工艺矿物学 锂绿泥石 矿物嵌布特征
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Pretreatment of Soil Samples Rich in Short-Range-Order Minerals Before Particle-Size Analysis by the Pipette Method
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作者 K. ALARY D. BABRE +4 位作者 L. CANER F. FEDER M. SZWARC M. NAUDAN G. BOURGEON 《土壤圈:英文版》 SCIE CAS CSCD 2013年第1期20-28,共9页
The possibilities of combining the dissolution of short-range-order minerals (SROMs) like allophane and imogolite, by ammonium oxalate and a particle size distribution analysis performed by the pipette method were inv... The possibilities of combining the dissolution of short-range-order minerals (SROMs) like allophane and imogolite, by ammonium oxalate and a particle size distribution analysis performed by the pipette method were investigated by tests on a soil sample from Reunion, a volcanic island located in the Indian Ocean, having a large SROMs content. The need to work with moist soil samples was again emphasized because the microaggregates formed during air-drying are resistant to the reagent. The SROM content increased, but irregularly, with the number of dissolutions by ammonium oxalate: 334 and 470 mg g-1 of SROMs were dissolved after one and three dissolutions respectively. Six successive dissolutions with ammonium oxalate on the same soil sample showed that 89% of the sum of oxides extracted by the 6 dissolutions were extracted by the first dissolution (mean 304 mg g-1 ). A compromise needs to be found between the total removal of SROMs by large quantities of ammonium oxalate and the preservation of clay minerals, which were unexpectedly dissolved by this reagent. These tests enabled a description of the clay assemblage of the soil (gibbsite, smectite, and traces of kaolinite) in an area where such information was lacking due to the difficulties encountered in recuperation of the clay fraction. 展开更多
关键词 土壤样品 粒径分析 短程 预处理 吸管法 矿产 订购 粘土矿物
新型固化剂加固成都粘土的矿物学研究 被引量:1
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作者 徐冠立 孙传敏 孙遥 《矿物岩石》 CAS CSCD 北大核心 2013年第4期1-6,共6页
以一种实验室合成的新型固化材料为固化剂,加固成都粘土。用无侧限抗压强度测试、XRF、xRD、SEM等方法研究了成都粘土加固前后力学性质、矿物组成、土壤组构的变化。成都粘土中的主要粘土矿物为蒙脱石、伊利石和高岭石,非粘土矿物为... 以一种实验室合成的新型固化材料为固化剂,加固成都粘土。用无侧限抗压强度测试、XRF、xRD、SEM等方法研究了成都粘土加固前后力学性质、矿物组成、土壤组构的变化。成都粘土中的主要粘土矿物为蒙脱石、伊利石和高岭石,非粘土矿物为石英和长石。加固后土壤中的自由水转化为结晶水,并生成了棒状钙矾石和蜂窝状、绒球状氢氧化铝凝胶,形成新的钙矾石一粘土矿物骨架结构。固化土无侧限抗压强度最高可达2.28MPa,实验证实新型固化材料对成都粘土有明显加固作用。 展开更多
关键词 成都粘土 土壤固化材料 矿物学
Characteristics of termite mounds and associated Acrisols in the coastal savanna zone of Ghana and impact on hydraulic conductivity 预览
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作者 Gabriel N. N. Dowuona Pearl Atwere +4 位作者 W. Dubbin Prosper M. Nude Baba E. Mutala Eric K. Nartey Richard J. Heck 《自然科学期刊(英文)》 2012年第7期423-437,共15页
Characteristics of termite mounds and associated Rhodic Acrisol and Haplic Acrisol in the coastal savanna zone of Ghana and their impact on hydraulic conductivity were assessed. The texture of the mounds was sandy cla... Characteristics of termite mounds and associated Rhodic Acrisol and Haplic Acrisol in the coastal savanna zone of Ghana and their impact on hydraulic conductivity were assessed. The texture of the mounds was sandy clay in contrast to the sandy clay loam of the surface soils. Translocation of fine to medium sized soil materials influenced the relatively higher bulk density (>1.60 Mg/m3) and contents of organic carbon, nitrogen and exchangeable bases in the mounds. Kaolinite was the dominant clay mineral with pH values generally below 5.3 in all the soils reflecting the weathered tropical soil environment. Dispersion ratio values, which were 0.5 for the surface soils, indicated greater stability of the mound due to aggregate cementing action by the termites. Estimated mound density was about 120 mounds per ha, which tied in with known groundwater reserves at the study sites. Majority of the mounds exhibited a cone-shaped morphology with heights varying between 3.05-4.00 m in the Rhodic Acrisol and 2.05-4.20 m in the Haplic Acrisol with corresponding estimated total mass of 96,361 kg and 54,910 kg per 1000 m2 land area. These estimates represented a large amount of material relative to the 25,000-26,000 kg of surface soil material within the same unit area. The K in the surface soils ranged from 3.3 x 10-5 to 5.0 x 10-5 m/s while the value for the mound was ≤0.5 x 10-5 m/s. Lower porosity, θ;the effect was more pronounced when the mound was applied on the soil surface. Improvement in water retention and nutrient availability to plants and prevention of leaching to avoid groundwater contamination are some of the positive attributes of this study. 展开更多
关键词 AGGREGATE Stability Clay MINERALOGY Dispersion Ratio Hydraulic Conductivity Mound Morphology TERMITE MOUNDS
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末次间冰期以来临夏地区气候变化的黏土矿物学及地球化学记录 预览 被引量:7
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作者 殷科 洪汉烈 +4 位作者 高文鹏 梁国军 王朝文 张克信 宋鄂平 《土壤学报》 CAS CSCD 北大核心 2012年第2期 246-259,共14页
临夏盆地塔湾剖面黄土-古土壤沉积物的黏土矿物学及常量元素特征分析表明,末次间冰期以来临夏地区气候变化经历了从相对温暖湿润(I阶段:92.4—78.8ka)-寒冷干燥(Ⅱ阶段:78.8~59.8ka)-相对温暖湿润(Ⅲ阶段:59.8—47.7ka... 临夏盆地塔湾剖面黄土-古土壤沉积物的黏土矿物学及常量元素特征分析表明,末次间冰期以来临夏地区气候变化经历了从相对温暖湿润(I阶段:92.4—78.8ka)-寒冷干燥(Ⅱ阶段:78.8~59.8ka)-相对温暖湿润(Ⅲ阶段:59.8—47.7ka)-寒冷干燥(Ⅳ阶段:47.7ka以来)等4个阶段的演化。黄土.古土壤中黏土矿物以伊利石、绿泥石、伊/蒙混层及坡缕石等为主,并且坡缕石在沉积物中广泛发育,表明末次间冰期以来临夏地区总体上以相对干燥为主。W(TiO2)/w(AlO3)比值表明沉积物剖面中黄土.古土壤层可能具有相同的物源,黄土一古土壤交替的发育特征应该为不同时期风化程度差别所致,与当时的大气降水量及温度密切相关。在相对温暖湿润的时期,黏土矿物相对含量、化学蚀变指数CIA值及W(Al2O3)/W(Fe2O3)、W(SiO2)/w(AlO3)、W(SiO2)/w(Fe2I3)和W(MgO)/w(Al2O3)等氧化物比率变化波动较大;在寒冷干燥的时期,黏土矿物相对含量、CIA值及各氧化物比率较为稳定。黏土矿物学及常量元素变化特征共同揭示92.4~78.8ka期间和47.7ka以来出现明显的降温事件,说明临夏地区末次间冰期以来气候环境的不稳定性,可能与高原冬、夏季风的此消彼长密切相关。 展开更多
关键词 临夏盆地 末次间冰期 黄土-古土壤 黏土矿物学 常量元素 气候环境
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四川沐川黄丹石英砂岩铁质赋存状态研究 被引量:5
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作者 汪灵 张科 +3 位作者 李萍 殷德强 范博文 唐小刚 《矿物学报》 CAS CSCD 北大核心 2012年第2期 183-192,共10页
为了给四川沐川黄丹石英砂岩矿的深入评价和低铁石英等高端应用提供科学依据,在前期研究基础上,采用X射线荧光光谱分析(XRF)、X射线粉晶衍射分析(XRD)和扫描电镜-能谱仪(SEM-EDS)等现代岩矿测试分析技术,并采用动态和综合分析以... 为了给四川沐川黄丹石英砂岩矿的深入评价和低铁石英等高端应用提供科学依据,在前期研究基础上,采用X射线荧光光谱分析(XRF)、X射线粉晶衍射分析(XRD)和扫描电镜-能谱仪(SEM-EDS)等现代岩矿测试分析技术,并采用动态和综合分析以及微区原位分析等方法,对矿石铁质赋存状态进行了深入研究,结果表明:原矿w(Fe2O3)为0.161%左右,变化范围是0.086%~0.272%;矿石的Fe2O3含量与SiO2和粒度大小呈负相关,而与SO3、Al2O3和K2O呈正相关;原矿石英含量〉90%,粒径范围0.2~0.5 mm,其晶体结构中不含类质同象杂质,但其表面存在大小为1~100μm的溶蚀坑,较大者被伊利石粘土所充填;粘土矿物和以黄铁矿为主要含铁矿物的黑色杂质的含量分别约为8%和1%,二者是Fe2O3的主要载体,所贡献的Fe2O3占原矿质量分数分别约为0.076%和0.085%(其中黄铁矿的贡献值为0.050%)。 展开更多
关键词 石英 石英砂岩 粘土矿物 黄铁矿 工艺矿物学
四川沐川黄丹石英砂岩工艺矿物学研究 预览 被引量:15
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作者 殷德强 汪灵 +3 位作者 孔芹 邓苗 李萍 范博文 《矿物岩石》 CAS CSCD 北大核心 2010年第1期 1-5,共5页
针对沐川黄丹石英砂岩选矿提纯工艺,采用多种岩矿现代测试分析方法,对该矿工艺矿物学进行研究,结果表明:该矿为一种硅泥质中粒含长石石英砂岩,石英碎屑粒径范围0.2mm~0.5mm;原矿以石英为主,结晶度高,含量90%左右,同时含少... 针对沐川黄丹石英砂岩选矿提纯工艺,采用多种岩矿现代测试分析方法,对该矿工艺矿物学进行研究,结果表明:该矿为一种硅泥质中粒含长石石英砂岩,石英碎屑粒径范围0.2mm~0.5mm;原矿以石英为主,结晶度高,含量90%左右,同时含少量或微量其它杂质矿物,它们是蒙脱石、伊利石、高岭石、微斜长石和方解石,以及黄铁矿、水铁矾、金红石、板钛矿等;对矿石质量影响较大是粘土矿物和黄铁矿,它们以粒间填隙物无序散布于石英颗粒之间;原矿w(SiO2)/%为94.02,W(Al2O3)3.88%,w(K2O)1.28%,W(CaO)0.18%等有害成分赋存于蒙脱石、伊利石、高岭石、微斜长石和方解石等矿物中;w(Fe2O3)0.09%主要赋存于黄铁矿中,也有部分来源于水铁矾和粘土矿物。 展开更多
关键词 石英砂岩 石英 黄铁矿 粘土矿物 工艺矿物学
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黏土矿物在古环境重建中的应用 预览 被引量:13
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作者 董红梅 宋友桂 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2009年第6期共12页
黏土矿物组成、含量以及结晶参数的变化与古环境(气候与沉积环境)变化密切相关,可以反映气候冷、暖周期性变化和沉积环境特征。近些年来,黏土矿物分析成为重建古环境的有效手段之一。在阐述黏土矿物的研究方法和古环境意义的基础上,对... 黏土矿物组成、含量以及结晶参数的变化与古环境(气候与沉积环境)变化密切相关,可以反映气候冷、暖周期性变化和沉积环境特征。近些年来,黏土矿物分析成为重建古环境的有效手段之一。在阐述黏土矿物的研究方法和古环境意义的基础上,对近20年来黏土矿物在海洋、黄土、湖泊古环境恢复当中的应用进行了回顾和评述。指出随着新的研究方法的不断引入与创新,黏土矿物分析已从定性研究转向半定量、定量研究;黏土矿物记录与孢粉、硅藻、粒度和氧同位素反映的古气候基本吻合,说明黏土矿物是古气候研究的有效方法。但气候以外的其他因素也能引起黏土矿物含量和组合的变化,因此,在进行古气候重建时必须考虑物质来源、水动力条件、地质地貌特征和地球化学环境以及构造运动等因素的可能影响。结合其他多种古环境代用指标的联合运用,黏土矿物研究将在古环境重建中发挥越来越重要的作用,具有广阔的应用前景。 展开更多
关键词 黏土矿物 古气候 古环境重建 源区示踪
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粘土矿物在环境矿物学中的应用研究 预览 被引量:1
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作者 曹蕾 《安庆师范学院学报:自然科学版》 2005年第4期 38-41,共4页
粘土矿物具有良好的过滤、吸附、离子交换等物理化学性能,在环境矿物学应用广泛.本文针对粘土矿物在污染治理、无机抗菌剂制备、环保建材及其他方面的应用研究进展作了综述,并分析了研究开发中的主要问题和发展趋势.
关键词 粘土矿物 环境矿物学 环境保护 研究进展
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石英岩的矿物学研究及包体激光拉曼检测 预览 被引量:2
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作者 雷绍民 龚文琪 张高科 《矿产保护与利用》 2002年第4期 20-24,共5页
对四川某地石英岩采用光学显微镜、电子探针和化学分析进行了矿物学研究.发现石英岩中除沿裂隙充填少量粘土矿物外,还伴有微量重金属矿物.石英薄片经激光拉曼检测表明,在石英成矿时因热液交代作用残留气-液两相包裹体和液体包体,该资源... 对四川某地石英岩采用光学显微镜、电子探针和化学分析进行了矿物学研究.发现石英岩中除沿裂隙充填少量粘土矿物外,还伴有微量重金属矿物.石英薄片经激光拉曼检测表明,在石英成矿时因热液交代作用残留气-液两相包裹体和液体包体,该资源可用于合成光学材料、玻璃、陶瓷原料并易于加工成高纯石英砂. 展开更多
关键词 激光拉曼 石英岩 粘土矿 矿物学 气-液包裹体 选矿工艺
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Distribution and Influence of Iron Phases on the Physico—Chemical Properties of Phyllosilicates 预览
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作者 MERVATSAIDHASSAN SAYEDMAHMOUDSALEM 《中国地球化学学报:英文版》 EI CAS 2002年第1期 29-39,共11页
Clay minerals from different Cretaceous stratigraphic successions of Egypt were investigated using XRD, DTA, dissolution analysis (DCB), IR, Mossbauer and X-band Electron Spin Resonance (ESR) spectroscopies. The purit... Clay minerals from different Cretaceous stratigraphic successions of Egypt were investigated using XRD, DTA, dissolution analysis (DCB), IR, Mossbauer and X-band Electron Spin Resonance (ESR) spectroscopies. The purity of the samples and the degree of structural order were determined by XRD. The location of Fe in the octahedral sheet is characterized by absorption bands at ~875 cm-1 assigned as Al-OH-Fe which is present after chemical dissolution of free iron. The Mossbauer spectra of these clays show two doublets with isomer shift and quadrupole splitting typical of octahedral coordinated Fe3+, in addition to third doubler with hyperfine parameter typical of Fe2+ in the spectra of Abu-Had kaolinite (H) sample. 6-lines magnetic hyperfine components which are consistent with those of hematite are confirmed in the spectra of both Isel and Rish kaolinite samples. Goethite was confirmed by both IR and DTA. Multiple nature of ESR of these clays suggested structural Fe in distorted octahedral symmetry and as non-structural Fe.Little dispersion and low swelling indices as well as incomplete activation of investigated montmorillonite samples by NaCO3 appear to be due to incomplete disaggregation of montmorillonite particles. This can be explained by the ability of Fe-gel to aggregate the montmorillonite into pseudo-particles and retard the rigid-gel structure. However, extraction of this ferric amorphous compound by dithonite treatment recovers the surface properties of the montmorillonite samples.On the other hand, amounts and site occupation of Fe associated with kaolinite samples show a negative correlation with the parameters used to describe the degree of crystalline perfection, color, brightness and vitrification range of these kaolinite samples. 展开更多
关键词 白垩纪 铁相 矿物学 物理化学性质 光谱学 结晶度 页硅酸盐矿物
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Distribution and Influence of Iron Phases the Physico—Chemical Properties of Phyllosilicates 预览
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作者 MERVATSAIDHASSAN SAYEDMAHMOUDSALEM 《中国地球化学学报:英文版》 EI CAS 2001年第2期 120-129,共10页
Clay minerals from different Cretaceous stratigraphic successions of Egypt were investigated using XRD,DTA,dissolution analysis(DCB),IR,Moessbauer and X-ray Electron Spin Resonance(ESR) spectroscopes.The purity of the... Clay minerals from different Cretaceous stratigraphic successions of Egypt were investigated using XRD,DTA,dissolution analysis(DCB),IR,Moessbauer and X-ray Electron Spin Resonance(ESR) spectroscopes.The purity of the samples and the degree of their structural order were determined by XRD.The location of Fe in the octahedral sheet is characterized by absorption bands at-875cm^-1 assigned as Al-OH-Fe which persist after chemical dissolution of free iron.The Moessbauer spectra of these clays show two doublets with isomer shift and quadrupole splitting typical of octahedrally coordinated Fe^3+,in addition to third doublet with hyperfine parameter typical of Fe^2+ in the spectra of Abu-Had kaolinite (H) sample.Six-lines magnetic hyperfine components which are consistent with those of hematite are confirmed in the spectra of both Isel and Rish kaolinite samples.Goethite was confirmed by both IR and DTA.Multiple nature of ESR of these clays suggested structural Fe in distorted octahedral symmetry as well as non-structural Fe.Little dispersion and low swelling indices as well as incomplete activation of the investigated montmorillonite samplas by NaCO3 appear to be due to incomplete disaggregation of montmorillonite particles.This can be explained by the ability of Fe-gel to aggregate the montmorillonite into pseudo-particles and retard the rigid-gel structure.However,extraction of this ferric amorphous compound by dithonite treatment recovers the surface properties of the montmorillonite samples.On the other hand,the amount and site occupation of Fe associated with kaolinite samples show an inverse correlation with the parameters used to describe the degree of crystallinity perfection,color,brightness and vitrification range of these kaolinite samples. 展开更多
关键词 白垩纪 粘土 铁相 矿物学 物理化学特征 光谱学
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Loess buried paleosols geosols welded paleosols pedocomplexes towards a global quaternary pedostratigraphy and paleoclimatic history 被引量:1
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作者 Arnt BRONGER 《中国科学通报:英文版》 SCIE CAS 1999年第S1期1-7,共7页
Micromorphological studies show that a comparision of the loess-paleosol sequence ofthe Karamaydan section, Central Asia, with the upper part of the Luochuan section, China, clearlyindicates that for the Brunhes chr... Micromorphological studies show that a comparision of the loess-paleosol sequence ofthe Karamaydan section, Central Asia, with the upper part of the Luochuan section, China, clearlyindicates that for the Brunhes chron the sequence at Karamaydan is even more detailed than thecorresponding section at Luochuan. Single paleosols at Luochuan correspond to pedocomplexes atKaramaydan; some pedocomplexes at Luochuan are represented by more detailed successions atKaramaydan (fig. 1). The loess-paleosol sequence at Karamaydan should therefore be regarded asa key sequence for reconstructing the climatic history of the Brunhes epoch. Correlation with thedeep-sea oxygen isotope record of Bassinot et al. (1994), which includes an accurate astronomicaltime scale, allows a detailed chronostratigraphical subdivision of the loess-paleosol sequence inKaramaydan for the Brunhes chron. Mineralogical and clay mineralogical investigations show thatthere is little difference in the type and amount of pedogenic clay mineral formation between twoHolocene soils and the paleosols in the Brunhes chron at Karamaydan. These results indicate thatthe climates of the interglacials represented by the B or Bt horizons of the buried paleosols weresimilar to that of the Holocene. In view of these results the Paleopedology Commission shoulddevelop a uniform terminology of mono- and polygenetic paleosols and pedostratigraphic unitswhich can be used globally. 展开更多
关键词 Paleopedology MICROMORPHOLOGY clay MINERALOGY pedostratigraphy QUATERNARY climatic HISTORY
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