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Coal metamorphism

Huang, Y. (1993). A possible relation between the disseminated gold mineralization and the Late Permian zonation of coal metamorphism in Western Guizhou. Geol. Guizhou (Quarterly) 10(4), 300—307 (in Chinese with English abstract). [Pg.418]

The investigation also shows that most SCs are located in high coal metamorphic regions. Nonof them is located in low metamorphic regions unless the regions are geothermal abnormal, as shown in Table 1. [Pg.1122]

Schopf JM, I-ong WE (1966) Coal metamorphism and igneous associations in Antarctica. In Gould RF (ed) Coal science, Adv. in Chemistry Sen, No. 55 156-195. Amen Chem. Soc. Seward AC (1914) Antarctic fossil plants. British Antarctic (Terra Nova) Expedition, 1910. Natural History Report, Geology 1(1) 1-149. British Museum of Natural History, London, England... [Pg.369]

Coal metamorphism is the consequence of burial, particularly in the dewatering from peat to lignite to subbituminous coal, and enhanced temperatures. Temperature ino-ease can be the result of burial at varying geothermal gradients, influx of thermal waters or brines through the coal, or, in rare cases, contact metamorphism in the vicinity of igneous intrusions. [Pg.121]

The relevance of the remarks on sulfur content is that, for reasons explained above, it is usually a valid index of the salinity of the environments of deposition. It was remarked earlier that the Eastern and Interior provinces have experienced different temperature/pressure/time histories. It should be added that coals of the Rocky Mountain, Pacific and Alaskan provinces most probably experienced yet further sets of conditions of metamorphism a locally increased geothermal gradient that produced relatively high temperatures at relatively low depths of burial and hence at relatively low pressures of overburden. [Pg.18]

I, 4 in hydrocarbons to 2 in pyridine (3 - 11,0) and again decreases to 1,5 in alcohols. Calculated on this basis value 3 of coal increases droningly with increasing the content of carbon from 70 % till 87 % and in a case of more metamorphized coal is sharply decreased again. Data concerning to the extraction of Greta coal are evidence of maximal yield of extract (more than 20 %) under it treatment with ethylendiamine and dimethylformamide (3 -... [Pg.53]

It is necessary to notify, that the critical analysis of the Flory theory application for the determination of molecular mass and the crossing density of the coal structure has been done in the Painter s works [16], Authors assert, that the possible formation of hydrogen bonds between the hydroxy groups of low-metamorphized coal has an important role here that is why, even a lot of empirical amendments introduction into calculations leads to obtaining the understated values of molecular masses of clusters. [Pg.54]

Response of Natural Coals to Metamorphism. The Martinsburg slate and its anthraxolite have clearly been subjected to low grade metamorphism. Presuming a low temperature origin such as suggested in the preceding section, at least part of the anthraxolite rank increase must be caused by this metamorphism. In order to evaluate this contribution to rank increase, it is useful to examine known cases of metamorphism of natural coals. MacFarlane (25) studied the thermal effects of intruded olivine basalt sills on Yampa coals (Colorado). He carried out parallel laboratory studies in which unaltered... [Pg.114]

Another proof of the importance of temperature is the fact that there is often a strict relationship between the run of isovols and the run of isotherms in deep profiles, both being influenced no doubt by the varying thermal conductivity of the different rocks. The strong influence of temperature on the rank of coal is obvious in the case of contact-metamorphic coals, whose rank increases distinctly when approaching the intrusive body. Apart from these geological observations, all experiments on artificial coalification have shown that temperature is the decisive factor in the coalification process. Thermodynamic and reaction kinetic considerations (9) also support this opinion. [Pg.143]

Some earlier authors maintain that folding pressure markedly accelerated metamorphism of the coals. White (33) and Stadnichenko (23) explain the... [Pg.143]

Geological investigations have shown that undoubtedly temperature has most influence on geochemical coalification. This is proved by such evidence as contact metamorphism of coals, increase of rank with increasing temperature of the earth s crust with depth, increase of rank of the same seam as magma chambers (batholiths) are approached, and relations between the thermal... [Pg.155]


See other pages where Coal metamorphism is mentioned: [Pg.145]    [Pg.160]    [Pg.173]    [Pg.473]    [Pg.704]    [Pg.708]    [Pg.712]    [Pg.716]    [Pg.46]    [Pg.1051]    [Pg.1121]    [Pg.1121]    [Pg.1121]    [Pg.1123]    [Pg.238]    [Pg.145]    [Pg.160]    [Pg.173]    [Pg.473]    [Pg.704]    [Pg.708]    [Pg.712]    [Pg.716]    [Pg.46]    [Pg.1051]    [Pg.1121]    [Pg.1121]    [Pg.1121]    [Pg.1123]    [Pg.238]    [Pg.201]    [Pg.2358]    [Pg.2358]    [Pg.29]    [Pg.297]    [Pg.13]    [Pg.13]    [Pg.41]    [Pg.126]    [Pg.57]    [Pg.63]    [Pg.4]    [Pg.4]    [Pg.247]    [Pg.100]    [Pg.115]    [Pg.117]    [Pg.120]    [Pg.137]    [Pg.156]   
See also in sourсe #XX -- [ Pg.708 ]

See also in sourсe #XX -- [ Pg.46 ]




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