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豫西晚古生代热变煤的性质及结构研究 总被引：2，自引：0，他引：2
煤化作用历程是影响煤性质及结构的重要因素之一。苏联学者波格丹娃对典型热变煤（通古斯煤田煤）与深成变质煤（顿巴斯煤田煤）所作对比研究表明:热变煤具有H/C 低、碳含量低、发热量低、粘结性较差等特点。我国晚古生代煤田区域热变质作用广泛发育,豫西煤田可作为典型代表。 相似文献
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氮是煤中的常见元素之一,煤中氮的赋存形态多样且随煤阶发生变化。以邯郸-峰峰矿区为例,利用X射线光电子能谱（XPS）实验,研究不同变质程度煤（Rran=1.08%~3.67%）中有机氮的赋存形态,探讨煤中各形态有机氮相对含量随煤阶的变化规律。结果表明:按N 1s XPS谱图分峰峰值的结合能可将煤中氮的形态归为N-6、N-5、N-Q和N-X四种;研究区煤中N-5的相对含量最高,且随着煤阶的增高而降低;N-Q的相对含量随着煤阶的增高而增高;煤中N-6的相对含量随煤阶呈“增-减-稳”的变化规律;N-X的相对含量为9.1%~35.1%,其与煤阶关系不明显;在煤阶Rran=1.08%~1.47%的范围内,煤的N 1s XPS谱图中缺失N-Q分峰,表明褐煤中相对含量最高的质子化吡啶氮在此阶段已几乎全部去质子化而转化为吡啶氮。不同变质阶段氮的赋存形态变化特征对燃煤发电及煤化工领域煤化学参数选取提供参考。 相似文献
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腐泥煤的煤化作用研究 总被引：3，自引：1，他引：2
腐泥煤的煤化作用特征目前了解甚少.对我国产出的不同时代、不同煤化程度腐泥煤,结合热模拟试验,并通过与腐殖煤的对比,较系统地研究了在煤化作用过程中,腐泥煤的宏观和微观岩石学特征、元素组成和化学结构的演变规律。在此基础上,探讨了腐泥煤的煤化作用机理,研究了其煤化程度指标,提出了其煤级划分方案。 相似文献
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通过对西南地区古生代受海影响煤和陆相煤以及中生代陆相煤３个系列煤样的对比研究，探讨了西南地区煤岩及碳、氢、氧、氮等元素的含量特征；首次提出了只要煤化程度恰当，中生代煤的粘结性并不比古生代弱的观点 相似文献
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对不同变质程度的煤进行了手标本和显微镜下研究、物理性质测定、化学成分分析以及 X 射线、红外光谱和顺磁共振分析。阐明了煤化过程中不同变质程度煤所表现出的一系列特征;探讨了其中的变化规律,确定出煤化过程是不可逆的渐变过程,是非芳环结构不断破坏,芳环结构不断稠合的过程。内部结构的变化使煤的物理化学性质和岩石学特征发生相应的变化,并伴随围岩粘土矿物组合和含量的变化。 相似文献
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煤变质古地温恢复方法探讨 总被引：2，自引：1，他引：1
煤和其它有机质一样,其变质作用主要取决于所遭受的最高温度及其持续的时间,压力不是主导因素。在煤化作用过程中压力仅能使煤的物理结构、构造发生变化,对中变质阶段的煤化作用却起延滞作用,温度的升高能大大加速煤化作用进程,故煤的煤化作用可以说是一种热的演化过程。 相似文献
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综述了煤中氮的赋存状态与氮含量的分布特征方面的研究现状及存在问题。认为,煤中的氮几乎全部以有机物的形式存在,其赋存状态主要有4种类型:吡咯型氮（N-5）、吡啶型氮（N-6）、季氮（N-Q）和氮氧化物（N-X）,且这四种含氮官能团的分配比例受煤阶和煤热解程度的影响。煤中氮的质量分数一般在0.5%~2.5%,其变化与煤级、成煤期、沉积环境、原始成煤植物、煤岩组成及岩浆侵入等因素有关。目前有关影响氮含量变化因素的研究主要集中在探讨氮的含量与煤级的关系上,并认为氮的含量随煤级升高而增大,但在煤化作用后期迅速降低。有关氮的研究可丰富煤的元素地球化学研究,并为煤的环境污染治理提供更多的科学依据。 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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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
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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20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献