Peat/coal type and depositional environment—are they related?

Moore, Tim A.; Shearer, J.C.

doi:10.1016/s0166-5162(03)00114-9

Cited by 160 publications

(69 citation statements)

References 47 publications

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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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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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“…The contents of pyrite, sulfate, and organic sulfur ranged from 0 wt % to 1.12 wt % (average = 0.29 wt %), 0 wt % to 0.15 wt % (average = 0.057 wt %), and 0.47 wt % to 1.05 wt % (average = 0.77 wt %), respectively. The δ 13 The Cl, Ti, V, Cr, Co, Ni, Cu, Ga, As, Br, Rb, Y, Nb, Mo, Ru, Pd, Ce, and Gd elements were rare and occurred in several coal samples ranging from 3.7-730 ppm ( Table 2). In contrast, the other elements, including P, S, Mn, Zn, Sr, Ba, and oxides including Na 2 …”

Section: Proximate Analyses and Coal Geochemistrymentioning

confidence: 99%

Peat-Forming Environments and Evolution of Thick Coal Seam in Shengli Coalfield, China: Evidence from Geochemistry, Coal Petrology, and Palynology

et al. 2018

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Due to the importance of the wide occurrence of thick coal seams for Chinese coal resources, the origins of these seams have received considerable attention. Using the Early Cretaceous No. 5 coal seam with a thickness of 16.8 m in Inner Mongolia as a case study, this paper presents a systematic investigation of the coal petrology, geochemistry, and palynology of 19 coal samples to explain the origin and evolution of peat accumulation. The results indicate that the No. 5 coal seam is generally characterized by low rank (lignite), dominant huminite (average = 82.3%), intermediate ash yield (average = 16.03%), and sulfur content (average = 1.12%). The proportion of spores generally increases from the bottom to the top of the coal seam, whereas the proportion of pollen decreases. The vegetation in the coal seam is dominated by gymnosperms at the bottom and by ferns at the top. The paleographic precursor peat was most likely accumulated in the lakeshore where herbaceous and bushy helophytes were dominant. The total sulfur content was positively related to the huminite content. The sulfur content was possibly derived from bacterial action with sulfur brought in via marine incursions. Three overall declining-increasing values of carbon isotopes within the No. 5 coal seam possibly indicated three general cooling trends during peat accumulation. The environment of peat accumulation included three cycles, including one drying-wetting-drying in the bottom part and two drying-upwards cycles in the upper part. These cycles of the peat-accumulation environment could likely be ascribed to climate change because of their good agreement with humidity signals from plant types at that stage.

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“…Vertical variation of these indices along the lignite seams profiles is Calder (1993) and Collinson and Scott (1987) believe that palynological and paleobotanical data would provide high precision for paleoenvironment. Several researchers have raised serious remarks for using these indices for low-rank coals (Lambersen et al 1991;Crosdale 1993;Dehmer 1995;Wust et al 2001;Scott 2002;Moore and Shearer 2003;Amijaya and Littke 2005). Several scientists have used a combined petrographic, organicgeochemical, and/or isotope data for understanding and reconstructing the environment of paleomire (Bechtel et al 2002(Bechtel et al , 2003Singh et al 2013).…”

Section: Depositional Environmentmentioning

confidence: 99%

Understanding the paleomires of Eocene lignites of Kachchh Basin, Gujarat (Western India): petrological implications

Singh

et al. 2017

Int J Coal Sci Technol

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The present paper entails the results of the investigations carried out on the lignite deposits of Kachchh Basin. The lignite samples were drawn from five lignite seams from Panandhro lignite field (Seam-I to -V) and eight lignite seams (Seam-I to -VIII) from the Matanomadh lignite field which are currently operational. The petrographic analysis of the lignites indicates a dominance of huminite group of macerals which is mainly contributed by ulminite-A, ulminite-B, attrinite, densinite, and phlobaphinite. Liptinite (chiefly sporinite, cutinite, resinite, and liptodetrinite) and inertinite (chiefly fusinite, funginite, and inertodetrinite) groups occur in subordinated amount. The mineral matter occurs in moderate concentration. Though sulfur content is high in these lignites, there is no fixed trend of variation of sulfur from bottom seam to top seam. The investigation reveals a flooded forest swamp having high rate of degradation. However, there were a few drier periods indicated by relatively more inertinite macerals. The petrography-based models indicate that the Kachchh lignites of Gujarat evolved in coastal marshy setting under transgressive phase. However, there were few intermittent fluvial activities giving rise to supratidal flood plain. This led to the formation of the associated carbonaceous shales in the basin.

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Peat/coal type and depositional environment—are they related?

Cited by 160 publications

References 47 publications

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

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

Peat-Forming Environments and Evolution of Thick Coal Seam in Shengli Coalfield, China: Evidence from Geochemistry, Coal Petrology, and Palynology

Understanding the paleomires of Eocene lignites of Kachchh Basin, Gujarat (Western India): petrological implications

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