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华北石炭二叠纪煤层含铵云母粘土岩夹矸研究 总被引：5，自引：3，他引：5
含铵云母粘土岩夹矸被广泛分布于华北石炭二叠纪聚煤区太原组及山西组煤层中，其可划分为６种类型。文章详细描述了岩石的特片和铵云母在粘土岩夹矸中的赋存特点，测试结果表明铵云母均为１Ｍ型铵云母，它们是由成煤植物和有机质降解形成的ＮＨ＾＋４离子，促使煤层粘土岩夹矸中的高岭石，伊利石在约１２０℃的酸性条件下转化成的。这种铵云母可以作为煤成气生成和储集的指示矿物。 相似文献
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华北聚煤区火山灰蚀变粘土岩夹矸的研究 总被引：8，自引：0，他引：8
本文论述了火山灰蚀为粘土岩夹矸的层位和分布，对结构构造作了系统分类及命名，首次在我国粘土岩夹矸中发现了较广泛分布的铵云母，还有伊利石和纳云母。成因矿物标型特征的研究为探索原始物质提供了可信的证据。 相似文献
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本文简要叙述了１１号层粘土岩夹矸的层位、分布及岩矿特征。粘土岩夹矸中的一水硬铝石晶粒常呈平行于层一是面的细纹、似薄层状聚集于富含碳质及有机质的粘土岩条带中。 相似文献
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本文简要叙述了11号煤层粘土岩夹矸的层位、分布及岩矿特征。粘土岩夹矸中的一水硬铝石晶粒常呈平行于层理面的细纹、似薄层状聚集于富含碳质及有机质的粘土岩条带中。晶体呈板状，晶粒粗大，晶形完好，连生晶发育，结晶程度高。淡褐色，透明─半透明，镜下无色透明，正高突起，最高干涉色二级蓝绿。晶胞参数为：a0=0．4406nm，b0＝0．9435nm，c0=0．2847nm，α=β=γ=90°。 相似文献
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小峪煤矿2号、3号煤层位于太原组顶部，含高岭石粘土岩夹歼10余层，可划分为隐晶高岭石、椭球颗粒高岭石、塑变颗粒高岭石、晶粒高岭石、晶斑及似斑状高岭石和一水软铝石高岭石粘土岩等6种岩石类型。主要由高岭石组成，含不等量的一水软铝石、石英晶屑及少量的金红石、锆石等矿物。测试分析结果表明，俗称“大同砂石”的第19层高岭石粘土岩夹矸，是质纯、高铝、低硅、低铁、低钛的优质高岭石粘土矿层，可作为精铸莫来石砂粉和合成莫来石的原料，其超细煅烧高岭土广泛用作塑料、橡胶、造纸工业的优质填料和涂料。关键词##4煤层;;粘土岩夹矸;;矿物岩石学特征 相似文献
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滇东黔西晚二叠世含煤沉积中火山灰蚀变形成的伊利石粘土岩夹矸 总被引：6，自引：0，他引：6
本文对广泛分布于滇东-黔西晚二叠世含煤沉积中粘土岩夹矸的岩石学、矿物学、化学组成和微量元素进行了研究。发现粘土岩夹矸的变种伊利石粘土岩夹矸(Illite-tonstein)在沉积盆地空间上成片分布,且与晚期成岩作用有明显的成因联系。粘土岩夹矸中粘土矿物构成与煤阶大体对应的关系,揭示了同沉积火山凝灰蚀变产物的后期变化趋势和规律。 相似文献
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通过研究无烟煤层中泥岩夹矸的岩石矿物学特征，探讨其主要成分高岭石发生转化的主要方向及影响因素。对晋城矿区实地观测，并采集一定量的标本，通过显微镜下鉴定、差热分析、X射线粉晶衍射分析、红外吸收光谱分析等研究，发现无烟煤层泥岩夹矸中高岭石主要向伊利石转化，并有伊利石-蒙脱石(I／M)混层矿物及蒙脱石出现。煤的变质程度升高、夹矸矿物转化的主要原因是区域变质作用及周围介质条件的影响。 相似文献
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F. C. Loughnan 《Australian Journal of Earth Sciences》2013,60(3):293-302
Kaolinite claystones that are similar in structure, texture and composition to the kaolin tonsteins of Western Europe, and to some of the flint clays of North America, are associated with the Wongawilli Seam in the southern part of the Sydney Basin, where they form thin persistent bands within the coal and somewhat thicker deposits immediately overlying the seam. The thin bands within the coal are fine grained and consist of brecciated to pelletal clasts composed of well‐ordered kaolinite set in a matrix of similar composition. The thicker deposits overlying the seam are much coarser grained and appear restricted in occurrence to the basin margins. They contain a predominance of oolites with kaolinite clasts bonded by a relatively sparse matrix and in places, remarkable ‘outgrowths’ of vermicular kaolinite. The origin of the deposits is discussed, and it is concluded that most of the unusual features of these claystones can be ascribed to a fluvial environment. 相似文献
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R. Addison R.K. Harrison D.H. Land B.R. Young A.E. Davis T.K. Smith 《International Journal of Coal Geology》1983,3(1):1-30
Laterally persistent tonsteins, up to 30 cm thick, occur in coal seams and associated sediments in the Tertiary Kutei Basin of East Kalimantan, Indonesia, where Neogene strata which form a generally eastward-prograding, marginal-marine to fluvio-deltaic sequence, are disposed in a north-northeast to south-southwest striking fold belt, centred on Samarinda. Eight tonsteins have so far been recorded in the middle to upper Miocene of the Badak syncline, some 40 km south-southwest of Samarinda, and range from tonsteins in the strict sense (kaolinite-mudstones of wide stratigraphical extent) including graupen and kristall varieties, to smectite-mudstones. They may pass laterally into each other. Most contain pyroclasts in varying stages of alteration and are regarded as volcanogenic. Primary textures include microscopic vitroclastic aggregates completely argillised to smectite, graded crystal-tuffs with abundant sanidine, glass shards and secondary vermiform kaolinite crystals, and argillised lithic tuffs. Texturally and compositionally these Tertiary tonsteins are closely similar to European Carboniferous tonsteins and this strengthens the conclusion of a volcanogenic origin even where pyroclastic textures have been removed through alteration. The East Kalimantan tonsteins are of economic and stratigraphic significance in providing distinctive horizons which have proved useful in aiding correlation of boreholes drilled in a coal-resource project in this area. 相似文献
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为了探讨伊利石对煤化作用和沉积环境的指示作用，以华北地区京西煤田侏罗纪煤层夹矸为研究对象，采用X射线衍射方法（XRD）和X射线荧光方法（XRF）分别测定煤层夹矸的矿物组成和化学组成，研究夹矸中伊利石矿物学特征及成因。结果表明，京西煤田侏罗纪煤层夹矸主要由伊利石、绿泥石和石英组成，其中，伊利石质量分数平均为62.92%。将XRD数据和XRF数据进行对比分析，计算得到伊利石平均化学式为（K0.37（NH4）0.03）Al2（Si3.60Al0.40O10）（OH）2。京西煤田煤层夹矸中伊利石主要由高岭石转化而来，伊利石的NH4+占层间阳离子的比例具有随沉积古盐度升高而逐渐升高的趋势，n（Si）/n（Al）Ⅳ具有随煤化程度升高而逐渐降低的趋势，这表明京西煤田侏罗纪煤层夹矸中的伊利石矿物学特征对沉积环境和煤化作用具有一定的指示作用。 相似文献
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Metamorphism of mineral matter in coal from the Bukit Asam deposit, south Sumatra, Indonesia 总被引：1，自引：3，他引：1
The coal of the Miocene Bukit Asam deposit in south Sumatra is mostly sub-bituminous in rank, consistent with regional trends due to burial processes. However, effects associated with Plio–Pleistocene igneous intrusions have produced coal with vitrinite reflectance up to at least 4.17% (anthracite) in different parts of the deposit. The un-metamorphosed to slightly metamorphosed coals, with Rvmax values of 0.45–0.65%, contain a mineral assemblage made up almost entirely of well-ordered kaolinite and quartz. The more strongly heat-affected coals, with Rvmax values of more than 1.0%, are dominated by irregularly and regularly interstratified illite/smectite, poorly crystallized kaolinite and paragonite (Na mica), with chlorite in some of the anthracite materials. Kaolinite is abundant in the partings of the lower-rank coals, but is absent from the partings in the higher-rank areas, even at similar horizons in the same coal seam. Regularly interstratified illite/smectite, which is totally absent from the partings in the lower-rank coals, dominates the mineralogy in the partings associated with the higher-rank coal beds. A number of reactions involving the alteration of silicate minerals appear to have occurred in both the coal and the associated non-coal lithologies during the thermal metamorphism generated by the intrusions. The most prominent involve the disappearance of kaolinite, the appearance of irregularly interstratified illite/smectite, and the formation of regular I/S, paragonite and chlorite. Although regular I/S is identified in all of the non-coal partings associated with the higher-rank coals, illite/smectite with an ordered structure is only recognised in the coal samples collected from near the bases of the seams. The I/S in the coal samples adjacent to the floor of the highest rank seam also appears to have a greater proportion of illitic components. The availability of sodium and other non-mineral inorganic elements in the original coal to interact with the kaolinite, under different thermal and geochemical conditions, appears to be the significant factor in the formation of these new minerals, and distinguishes the mineralogical changes at Bukit Asam from those developed more generally with rank increases due to burial, and from the effects of intrusions into coals that were already at higher rank levels. 相似文献
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运用偏光显微镜、低温灰化+X射线衍射仪、带能谱的扫描电镜对内蒙古大青山煤田阿刀亥矿晚古生代CP2煤层中矿物的赋存状态及其成因进行了研究.研究表明阿刀亥矿CP2煤层中矿物包括硬水铝石、勃姆石、磷钡铝石、高岭石、铵伊利石、方解石、白云石、菱铁矿、锐钛矿、氟磷灰石、石英和黄铁矿.硬水铝石、勃姆石、磷钡铝石、高岭石和铵伊利石一般充填在丝质体、半丝质体、结构镜质体胞腔中或者分布在基质镜质体中.方解石和白云石主要充填在裂隙中.硬水铝石、勃姆石和磷钡铝石是由来源于本溪组铝土矿风化壳的物质在泥炭聚集时沉积形成的.铵伊利石是由于花岗岩侵入体的影响形成的.方解石和白云石可能来源于岩浆热液. 相似文献
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鄂尔多斯盆地东部太原组碎屑岩中自生伊利石形成机制及其对储层形成的影响 总被引：2，自引：0，他引：2
鄂尔多斯盆地东部太原组砂岩骨架颗粒中几乎没有碎屑长石,残余的微量长石(在岩石中的平均含量为0.4%.低于X射线衍射检测限)主要为钾长石,同时具有较低的自生高岭石含量(1.02%)、很低的自生石英含量和同期火山物质含量,以及较高的自生伊利石含量(1.22%),这表明太原组的自生伊利石主要是在相对高温的深埋藏封闭条件下,通过钾长石溶解反应:钾长石+H~++H_2O→高岭石+硅质+K~+和高岭石伊利石化反应:高岭石+K~+→伊利石+H~++H_2O或其加和反应:钾长石+高岭石→硅质+伊利石+H_2O形成,后者通过消耗钾离子而克服钾长石溶解的动力学屏障,是前者的重要驱动反应,并向流体输出氢离子,因此对次生孔隙的形成、尤其是在相对深埋藏的成岩过程中与钾长石溶解有关的次生孔隙的形成具有显著的积极作用. 相似文献