共查询到20条相似文献，搜索用时 93 毫秒
1.
区内二1煤层具有煤类多，分带明显的特点，煤变质和蔼具有南高北低的变化规律，燕山期区域岩浆热变质作用是煤变质质规律的主要控制因素，其中，汽水热液变质作用又处主导地位。 相似文献
2.
《中国煤炭地质》2021,(7)
为系统研究河南省石炭-二叠纪煤的变质作用类型及变质演化规律,采用野外钻探、测试分析、统计、计算机模拟等方法,对石炭-二叠纪煤类、煤的变质程度、变质作用类型等进行研究。结果表明,石炭-二叠纪煤变质程度总体较高,以焦煤-无烟煤为主,可采煤层的变质程度以及煤类在平面上近似呈环带状分布。煤的变质作用主要为深成变质作用、动力变质作用、接触变质作用和区域岩浆热变质作用。深成变质作用对石炭-二叠纪煤的变质具有普遍控制作用。煤的变质演化历程表明,经历了印支期三叠纪深成变质作用;燕山期侏罗纪,煤系处于高温低压带环境,岩浆活动强烈,区域岩浆变质作用使煤级剧增,叠加动力变质作用、接触变质作用后,局部煤级进一步增加,形成了现今石炭-二叠纪煤变质分带,其后不同时期各类变质作用对煤级的影响已经非常微弱。 相似文献
3.
4.
也论汝箕沟矿区煤的岩浆热变质成因 总被引：6，自引：0，他引：6
汝箕沟矿区发育侏罗纪无烟煤。前人引证航磁资料，认为是隐伏岩体热变质作用形成。作者通过对区内详细地煤岩学研究，发现煤中存在着热变质的成因“标记”：高的反射率，强的各向异性，新生的各向异性体及热液气孔，热液岩脉等。因此，岩浆热变质作用使区内达无烟煤级，岩体部位、导热方式、加热速率等诸因素综合作用导致了现今北东向展布的半环带状煤级分带。 相似文献
5.
6.
7.
华北地区南部晚古生代煤的变质成因——地下水热液对煤变质作用影响的进一步探讨 总被引：1，自引：0，他引：1
在分析造成华北地区南部晚古生代煤变质分带性的地质因素基础上,阐述了煤变质成因与区域构造格局演化的密切联系;从古地热异常形成机制出发,着重讨论了地下水热液对煤变质作用的影响,建立了煤的地下水效液变质作用地质模式;用古地热-煤变质系统的概念,根据热源、载热体和通道、聚热体3个要素的配置,分析了煤变质成因。 相似文献
8.
华北地区南部晚古生代煤的变质成因：地下水热液对煤变质作用影响的… 总被引：6，自引：0，他引：6
在分析造成华北地区南部晚古生代煤变质分带性的地质因素基础上，阐述了煤变质成因与区域构造格局演化的密切联系；从古地热异常形成机制出发，着重讨论了地下水热液对煤变质作用的影响，建立了煤的地下水热液变质作用地质模式；用古地热－煤变质系统的概念，根据热源、载热体和通道、聚热体３个要素的配置，分析了煤变质成因。 相似文献
9.
湘中南地区煤变质与地质构造关系的研究 总被引：2，自引：0，他引：2
对耒阳一临武径向构造带内的白沙含煤向斜用计算机计算镜质组反射率椭球确定了古构造应力场方向,发现其工变质分带没有联系。笔者还将研究区中的其他几个向斜工的变质程度与构造形迹,构造复杂程度、煤受构造破坏程度进行了对比研究。研究结果表明,煤变质指标等值线延展方向与向斜轴不平行而呈大角度相交;受抗日 强烈的向斜陡翼的煤变质程度并不高于受挤压相对弱的缓倾斜翼;祁阳山字型构造中煤变质指标等值线延展方向穿切前弧而 相似文献
10.
湘中涟源煤盆测水组煤动力变质作用的特征及其成因探讨 总被引：2，自引：0，他引：2
从煤变质程度、煤变质特征，煤变质带展布，煤的物理性质和结构构造，煤化学结构等方面，论述了湘中涟源煤盆早硬币炭世测水组煤动力变质作用的特征，并对其成因进行了探讨。 相似文献
11.
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.
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
13.
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
14.
Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
15.
正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
16.
正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
17.
正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
18.
正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
19.
正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
20.
正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献