Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Duncan G. Murchison"'
Publikováno v:
Geological Journal. 8:83-94
Vitrinite from the Devonian Gramscatho Beds at Pendower in southwestern Cornwall displays optical properties which indicate an extremely high rank (meta-anthracite). Despite this high rank, wood structures are clearly evident in polished sections bet
Autor:
Duncan G. Murchison
Publikováno v:
International Journal of Coal Geology. 62:5-31
The paper describes the development of coal petrology, then organic petrology, over a period of approximately 175 years around and in Newcastle upon Tyne (England). From 1833 until 1950, the basis of study was essentially transmitted light microscopy
Autor:
Duncan G. Murchison
Publikováno v:
International Journal of Coal Geology. 58:133-146
The offshore extensions of the Northumberland and Durham Westphalian coalfields are formed of continuous and linked sequences of sediments which lie in contrasting structural regimes, respectively ‘Basin’ and ‘Block’. The coalfields have suff
Publikováno v:
Fuel. 79:865-871
The Plessey (M) coal in the Northumberland and Durham coalfields has never had the economic significance of many other coal seams in the region because of its variable thickness and its sporadic occurrence as several thin seams. Where mined, the seam
Publikováno v:
Fuel. 78:1417-1423
Seventy coal samples from the Maudlin (H) horizon (the main seam and two thin seams, one above and one below the main seam), from thirty boreholes on offshore easterly extensions to the contiguous Northumberland and Durham coalfields were analysed fo
Autor:
Anne C. Raymond, Duncan G. Murchison
Publikováno v:
Organic Geochemistry. 18:725-735
Although there are many data in the literature relating to changes of certain relatively simple chemical parameters of kerogens promoted by igneous activity, there have been few reports of how the distributions of polycyclic alkanes and aromatic hydr
Autor:
Duncan G. Murchison
Publikováno v:
Fuel. 70:296-315
Petrographic aspects of coal reactivity are most satisfactorily observed with the microscope, unless the alteration is severe and large scale, for example in some industrial and natural cokes. Although qualitative microscopical observations are the m
Autor:
Anne C. Raymond, Duncan G. Murchison
Publikováno v:
Fuel. 70:155-161
Vitrinite reflectances are reported for coals and argillaceous sediments from nine borehole successions in the eastern and central Midland Valley of Scotland. Suppression of reflectances of vitrinite clasts in argillaceous sediments is significant in
Autor:
Anne C. Raymond, Duncan G. Murchison
Publikováno v:
Fuel. 70:243-249
Reflectances have been measured on vitrinites in coals and argillite clasts contained in tuffs and agglomerates of Carboniferous and early Permian volcanic necks along a ca. 6.5 km shore section in East Fife (Midland Valley of Scotland). The vitrinit
Publikováno v:
Fuel. 69:1037-1046
Optical properties of vitrinites often display reversals in trend approaching contacts with igneous intrusions. Reflectance (maximum, average or random) is the most common property affected within thermal aureoles, but parameters of optical anisotrop