On the optically biaxial character and heterogeneity of anthracites

Düber, S.; Pusz, S.; Kwiecińska, Barbara; Rouzaud, Jean-Noël

doi:10.1016/s0166-5162(00)00012-4

Cited by 66 publications

(46 citation statements)

References 20 publications

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“…In all samples the RIS parameters can be reconstructed by assuming one single textural class. Thus, the heterogeneity of the RIS shapes which was observed by Duber et al (2000) in anthracites of several coal basins is not encountered in this study.…”

Section: Vitrinite Reflectancementioning

confidence: 72%

“…The reflectance of the samples is described by a reflectance indicating surface (RIS) which was reconstructed using the method of Kilby (1988Kilby ( , 1991. The RIS represents a three-dimensional ellipsoid with the orthogonal optical axes R max , R int and R min (see also Duber et al 2000). Due to compaction, vitrinite exhibits typically an uniaxial negative (R max =R int >R min ) RIS.…”

Section: Samples and Methodsmentioning

confidence: 99%

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Conversion of carbonaceous material to graphite within the Greywacke Zone of the Eastern Alps

Rantitsch

Grogger

Teichert

et al. 2004

Int J Earth Sci (Geol Rundsch)

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Morphology and reflectance of carbonaceous material (CM) in Late Carboniferous metasediments of the eastern Greywacke Zone (Eastern Alps) indicate a mixture of vitrinite, grainy textured and lamellar shaped particles. As imaged by high-resolution atomic-force microscopy, vitrinite and the grainy textured particles show mesophase structures which can be described as facetted nanocrystals within the carbon matrix. Highresolution transmission electron microscopy has revealed two types of microtextures representing different degrees of graphitization. The first type is characterized by elongated ring-shaped microtextures, whereas the second type is characterized by graphite lamellae and polygonal flakes with long-range ordered aromatic layers. In spite of the heterogeneity of the CMs, the geographical distribution of quantitative metamorphic parameter (Raman spectra parameter, X-ray diffraction pattern, microscopic reflectance) suggests a graphitization process which is promoted by advective heat transport during post-collisional processes. In a tentative pressure-time path, Late Cretaceous thrusting results in a turbostratic ordering of the aromatic layer. Ordering to long-range ordered aromatic layers was achieved during the Late Cretaceous-Paleogene exhumation of mid-crustal rocks beneath the eastern Greywacke Zone.

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Section: Vitrinite Reflectancementioning

confidence: 72%

Section: Samples and Methodsmentioning

confidence: 99%

Conversion of carbonaceous material to graphite within the Greywacke Zone of the Eastern Alps

Rantitsch

Grogger

Teichert

et al. 2004

Int J Earth Sci (Geol Rundsch)

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“…For ac cu rate de termi na tion of the reflectance in di cat ing sur face (RIS), the mod ified Killby's method was used. Val ues of ap par ent max i mum and min i mum reflectances were mea sured and pro cessed accord ing to the Kilby's method (Kilby, 1988) and its mod i fi ca tions (Duber et al, 2000).…”

Section: Methods Optical Microscopymentioning

confidence: 99%

An effect of igneous intrusion on the structure, texture and microtexture of coal from the Sośnica coal mine, Upper Silesian Coal Basin, Poland

Smędowski

Düber

Matuszewska

2015

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Smêdowski, £., Duber, S., Matuszewska, A., 2015. An ef fect of ig ne ous in tru sion on the struc ture, tex ture and microtexture of coal from the Sooenica coal mine, Up per Silesian Coal Ba sin, Po land. Geo log i cal Quar terly, 59 (3): 507-516, doi: 10.7306/gq.1226Two coal sam ples from the Sooenica coal mine, Po land, were ana lysed in this study. One sam ple was the nat u ral char collected at the con tact of mag matic in tru sion, and an other sam ple was the raw coal that was pyrolised in a lab o ra tory fur nace. Tem per a ture of py rol y sis was sim i lar to that cal cu lated for the in tru sion. The ob tained char was ana lysed to com pare its features with those char ac ter iz ing a nat u ral char sam ple. Op ti cal mi cros copy, trans mis sion elec tron mi cros copy and Raman spec tros copy stud ies show that the char from un al tered coal is char ac ter ized by the least de vel oped struc ture, tex ture and microtexture com pared to the nat u ral char. Hence, it can be con cluded that geo log i cal pres sure gen er ated by both the in trusion and the over bur den, strongly af fects the pro cess of mo lec u lar or der ing that took place dur ing the heat ing of coal. The tex tural, struc tural or microtextural pa ram e ters of coal can not be used as a geo-ther mom e ter, be cause they are strongly depend ent not only on the tem per a ture but also on other fac tors.

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“…Kilby (1988Kilby ( , 1991 proposed a method for determining the optical character of coal on the basis of measurements of apparent maximum (R' max ) and apparent minimum (R' min ) reflectance values of non-oriented coal grains. This method made possible the reconstruction of the RIS of powdered samples (Duber et al, 2000;Grieve, 1991). The three principal axes of a RIS are then determined by means of a graphical method which involves plotting measured R' max and R' min values versus bireflectance (R' bi ),…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…A measurement of the precision of R' max and R' min measurements by various analysts in different laboratories is required to confirm the applicability of these parameters. The approach used was based on the work by Duber et al (2000) and Pusz et al (2002Pusz et al ( , 2003. The round-robin exercise involved 18 participants from 6 countries, thirteen of whom measured reflectance values -seven participants for each stage of the exercise, except for experiments at the temperature 450ºC and 700ºC, where five analysts participated (Table 1).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Application of reflectance parameters in the estimation of the structural order of coals and carbonaceous materials. Precision and bias of measurements derived from the ICCP structural working group

Pusz

Borrego

Alvarez

et al. 2014

International Journal of Coal Geology

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Optical reflectance of vitrinite is one of the fundamental physical properties that have been used for the study of coal and carbonaceous materials. Organic matter in coals and carbonaceous matter consists mainly of aromatic lamellae, whose dimensions and spatial orientation define its internal structure. Various reflectance parameters describe well the average degree of order of the molecular structure of organic matter. Moreover, reflectance A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTGood correlations were found between the reflectance parameters studied and structural factors obtained by comparative methods. The reflectance parameters examined proved to be very sensitive to any changes of the structural order of coals and carbonaceous materials and seem to be a perfect complement to structural studies made by X-ray diffraction or Raman spectroscopy.

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On the optically biaxial character and heterogeneity of anthracites

Cited by 66 publications

References 20 publications

Conversion of carbonaceous material to graphite within the Greywacke Zone of the Eastern Alps

Conversion of carbonaceous material to graphite within the Greywacke Zone of the Eastern Alps

An effect of igneous intrusion on the structure, texture and microtexture of coal from the Sośnica coal mine, Upper Silesian Coal Basin, Poland

Application of reflectance parameters in the estimation of the structural order of coals and carbonaceous materials. Precision and bias of measurements derived from the ICCP structural working group

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