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

Shen, Jian; Qin, Yong; Wang, Jinyue; Shen, Yue; Wang, Geoff

doi:10.3390/min8030082

Cited by 17 publications

(2 citation statements)

References 92 publications

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“…If precipitation outpaces evaporation, an ombrotrophic mire would be developed (Jerrett et al ., 2011c). The subtropical warm and humid climate in the Early Cretaceous of the Erlian Basin (Zhu et al ., ; Shen et al ., ) may have helped to maintain water‐saturated conditions, providing enough rain for peat formation.…”

Section: Discussionmentioning

confidence: 99%

Controls on accumulation of anomalously thick coals: Implications for sequence stratigraphic analysis

et al. 2019

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Coal seams preserve high-resolution records of ancient terrestrial water table (base level) fluctuations in ancient peat accumulations, but little is known about base level change in anomalously thick coal seams. Using the Early Cretaceous 91 m anomalously thick No. 6 coal (lignite) seam in the Erlian Basin (north-east China) as a case study, the origin and evolution of peat accumulation in a continental faulted basin is revealed by sedimentological, sequence stratigraphic and coal petrological analyses. The lignite is dominated by huminite, indicating oxygen-deficient and waterlogged conditions in the precursor mire. Four types of key sequence stratigraphic surfaces are recognized, including paludification, terrestrialization, accommodation-reversal and give-up transgressive surfaces. Vertically, the No. 6 coal seam consists of fourteen superimposed wetting-up and dryingup cycles separated by key sequence stratigraphic surfaces, with each of these cycles having a mean duration of about 156 to 173 kyr. In a high accommodation peat swamp system, the wetting-up cycles are generally characterized by an upward increase in mineral matter and inertodetrinite and an upward decrease in huminite with the paludification surface as their base and the give-up transgressive surface or accommodation-reversal surface as their top, representing a trend of upward-increasing accommodation. In contrast, the drying-up cycles are generally characterized by an upward decrease in mineral matter and inertodetrinite and an upward increase in huminite, with the terrestrialization surface as their base and the accommodation-reversal surface as their top, representing a trend of upward-decreasing accommodation. A multi-phase mire stacking model for accumulation of the coal seam is proposed based on high-frequency accommodation cycles and the stratigraphic relationships between coal and clastic sediments. High-frequency accommodation cycles in the coal are closely related to water table fluctuations in the precursor mires and are driven by high-frequency climate via changes in the intensity and seasonality of precipitation in a relatively stable subsidence regime. Recognition that the No. 6 coal seam is composed of multiple stacked mires has implications for 991

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Section: Discussionmentioning

confidence: 99%

Controls on accumulation of anomalously thick coals: Implications for sequence stratigraphic analysis

et al. 2019

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“…5a). Sporo-pollen assemblages in the coals indicate that the vegetation was dominated by conifers and ferns (pteridophytes) (Shen et al 2018), which might feed the ground fire.…”

Section: Fire Typesmentioning

confidence: 99%

Characteristics of Early Cretaceous wildfires in peat-forming environment, NE China

et al. 2019

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Inertinite maceral compositions in coals from the Early Cretaceous Erlian, Hailar, and Sanjiang Basins in NE China are analyzed in order to reveal palaeowildfire events and palaeoclimate variations. Although huminite is the dominant maceral group in the studied basins, the inertinite group, as a byproduct of palaeowildfires, makes up a considerable proportion. Occurrence of inertinite macerals indicates that wildfires were widespread and frequent, and supports the opinion that the Early Cretaceous was a "high-fire" interval. Inertinite contents vary from 0.2% to 85.0%, mostly within the range of 10%-45%, and a model-based calculation suggests that the atmospheric oxygen levels during the Aptian and Albian (Early Cretaceous) were around 24.7% and 25.3% respectively. Frequent fire activity during Early Cretaceous has been previously related to higher atmospheric oxygen concentrations. The inertinite reflectance, ranging from 0.58%Ro to 2.00%Ro, indicates that the palaeowildfire in the Early Cretaceous was dominated by ground fires, partially reaching-surface fires. These results further support that the Cretaceous earliest angiosperms from NE China were growing in elevated O 2 conditions compared to the present day.

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Coal Petrology Effect on Nanopore Structure of Lignite: Case Study of No. 5 Coal Seam, Shengli Coalfield, Erlian Basin, China

et al. 2020

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

Cited by 17 publications

References 92 publications

Controls on accumulation of anomalously thick coals: Implications for sequence stratigraphic analysis

Controls on accumulation of anomalously thick coals: Implications for sequence stratigraphic analysis

Characteristics of Early Cretaceous wildfires in peat-forming environment, NE China

Coal Petrology Effect on Nanopore Structure of Lignite: Case Study of No. 5 Coal Seam, Shengli Coalfield, Erlian Basin, China

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