Coal maceral ratios as indicators of environment of deposition: do they work for ombrogenous mires? An example from the Miocene of New Zealand

Crosdale, Peter J.

doi:10.1016/0146-6380(93)90064-i

Cited by 89 publications

(30 citation statements)

References 17 publications

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“…This is in contrast to the model proposed by Crosdale (1993) and Edbrooke et al (1994) for Tertiary New Zealand coals, which suggests that the highest abundance of wood (i.e. vitrain banding) should occur at the margin of the deposit.…”

Section: Implications For Controls On Vitrain Bandingcontrasting

confidence: 54%

Floral assemblage of the “D” coal seam (Cretaceous): Implications for banding characteristics in New Zealand coal seams

Ward

Moore²,

Newman

1995

New Zealand Journal of Geology and Geophysics

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Two complete vertical sections were studied from the uppermost Cretaceous "D" coal seam near Greymouth, New Zealand. The thickest and most concentrated vitrain bands occur in the paleomire centre and bands are thinner and less abundant at the paleomire margin. Botanical analysis of the vitrain bands indicates they formed entirely from the secondary xylem (wood) of gymnosperms. Palynomorphs indicate that there is no consistent correlation between conifer pollen abundance and the degree of vitrain banding. However, maximum preservation of vitrain bands coincides with an inferred transition from a rheotrophic mire (as indicated by Phyllocladidites mawsonii pollen) to an acidic and possibly ombrotrophic system (as indicated by the abundance of Gleicheniaceae spores). This suggests that the presence/absence of gymnosperm secondary xylem as vitrain bands is controlled at least in part by mire chemistry.

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Section: Implications For Controls On Vitrain Bandingcontrasting

confidence: 54%

Floral assemblage of the “D” coal seam (Cretaceous): Implications for banding characteristics in New Zealand coal seams

Ward

Moore²,

Newman

1995

New Zealand Journal of Geology and Geophysics

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“…Gelification Index (GI) and Tissue Preservation Index (TPI) were introduced by Diessel (1986) to characterize the depositional environments of Australian coals. Subsequently, some scientists made critical comments against the usage of these indices especially for Tertiary coals and lignites (Lamberson et al, 1991;Crosdale, 1993;Dehmer, 1995;Scott, 2002;Moore and Shearer, 2003;Amijaya and Littke, 2005). However, modifications were made in the indices by some researchers to make it applicable for other coals (Calder et al, 1991).…”

Section: Depositional Environmentmentioning

confidence: 99%

Petrographic and Geochemical Characterization of Coals from Tiru Valley, Nagaland, NE India

Singh

et al. 2012

Energy Exploration & Exploitation

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In Tiru valley region of Mon district coals occur in Barail Formation and are of Oligocene age. This study is the first investigation on the petrographic and geochemical characterization of these coals. These thinly bedded seams (<2 m) need systematic exploration for proper evaluation of the resource.The coals are bright to moderately bright in appearance and at places look moderately dull. The study reveals that Tiru valley coals are sub-bituminous to bituminous-D in rank. The chemical study reveals that these coals are perhydrous in nature with moderately high volatile matter content. The sulphur content was probably increased with pyrite inclusion as the most abundant mineral. Vitrinite is the most dominant maceral group constituting nearly 98% of all the macerals while liptinite and inertinite occur in very low concentration. Facies-critical models used to decipher the paleodepositional environment suggest that these coals evolved under wet moor with moderately high flooding in the paleomire which allowed the sulphate reducing bacteria to thrive.

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“…Even though the applicability of maceral ratios and coal-facies diagrams as palaeoenvironmental indicators is debatable (Crosdale 1993;Dehmer 1995;Wüst et al 2001;Scott 2002;Moore and Shearer 2003), they can provide a tool to interpret coal formation when combined with lithostratigraphic, mineralogical, and geochemical data (Kalaitzidis et al 2004(Kalaitzidis et al , 2010Siavalas et al 2009;Jasper et al 2010;Zdravkov 2011;Karayiǧit et al 2015). The maceral ratios are only indicative and complementary to the sedimentological features for describing and reconstructing the palaeoenvironmental conditions.…”

Section: Coal-facies Diagramsmentioning

confidence: 96%

Palaeoenvironmental reconstruction of Hüsamlar coal seam, SW Turkey

et al. 2015

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TheÖren and Yatagan Basins in SW Turkey host several Miocene coal deposits currently under exploitation for power generation. The present study aims to provide insight into the palaeoenvironmental conditions, which controlled the formation of the Hüsamlar coal seam located inÖren Basin. The coal seam displays many sharp alternations of matrix lignite beds and inorganic, lacustrine sediment layers. The coal is a medium-to-high ash lignite (10.47-31.16 wt%, on dry basis) with high total sulphur content (up to 10 wt%, on dry, ash-free basis), which makes it prone to self-combustion. The maceral composition indicates that the peat-forming vegetation consisted of both arboreal and herbaceous plants, with the latter being predominant in the upper part of the seam. Mica and feldspars contribute to the low part of the seam; carbonates are dominant in the upper part, whereas quartz and pyrite are present along the entire coal profile. The sudden transitions of the telmatic to the lacustrine regime and reverse is attributed to tectonic movements that controlled water table levels in the palaeomire, which affected surface runoff and hence, clastic deposition.

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Coal maceral ratios as indicators of environment of deposition: do they work for ombrogenous mires? An example from the Miocene of New Zealand

Cited by 89 publications

References 17 publications

Floral assemblage of the “D” coal seam (Cretaceous): Implications for banding characteristics in New Zealand coal seams

Floral assemblage of the “D” coal seam (Cretaceous): Implications for banding characteristics in New Zealand coal seams

Petrographic and Geochemical Characterization of Coals from Tiru Valley, Nagaland, NE India

Palaeoenvironmental reconstruction of Hüsamlar coal seam, SW Turkey

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