Geochemical characteristics and paleoclimate implication of Middle Jurassic coal in the Ordos Basin, China

Wang, Luojing; Lv, Dawei; Hower, James C.; Zhang, Zhihui; Raji, Munira; Tang, Jian; Liu, Yamin; Gao, Jian

doi:10.1016/j.oregeorev.2022.104848

Cited by 23 publications

(13 citation statements)

References 42 publications

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“…This analysis revealed differences in type and concentrations of the various REE specimens. We also found that the REE contents in our coal samples differ from those in the coals from the northern margin of the Ordos Basin that were investigated by Wang et al (2022).…”

Section: Influence Of Provenance and Tectonic Setting On Coal Formationmentioning

confidence: 48%

Reconstruction of provenance and tectonic setting of the Middle Jurrasic Yan'an Formation (Ordos Basin, North China) by analysis of major, trace and rare earth elements in the coals

Gao

Loon

et al. 2022

Ore Geology Reviews

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Section: Influence Of Provenance and Tectonic Setting On Coal Formationmentioning

confidence: 48%

Reconstruction of provenance and tectonic setting of the Middle Jurrasic Yan'an Formation (Ordos Basin, North China) by analysis of major, trace and rare earth elements in the coals

Gao

Loon

et al. 2022

Ore Geology Reviews

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“…The coal-bearing cycles in the Yan'an Formation show similar sedimentary characteristics (vertical changes in, depositional conditions, coal distribution, etc.) (Wang et al, 2011;Ielpi, 2012;Lv et al, 2019;Zhang et al, 2021b;Wang et al, 2022), but these characteristics were not yet well explained. The coal-forming model presented here, with the interaction between basin subsidence and climate changes (Zainal Abidin et al, 2022), which sometimes strengthened each other but sometimes reduced the joint effect, explains the lateral distribution and the vertical occurrences of the coal seams in a context of sequence stratigraphy that is at least partly determined by astronomical factors, in particularly the fluctuations in eccentricity of the Earth's orbit.…”

Section: Coal-forming Modelmentioning

confidence: 99%

“…The surroundings of the basin have been tectonically strongly active, and Mesozoic and Cenozoic activity resulted in a complex orogenic zone around the basin (Liu et al, 2021). In contrast, the interior remained relatively stable, although uplift, subsidence, and some folding have taken place (Johnson et al, 1989;Liu et al, 2021;Wang et al, 2022;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Sequence stratigraphy of the Middle Jurassic Yan’an Formation (NE Ordos Basin, China), relationship with climate conditions and basin evolution, and coal maceral’s characteristics

Shen

Loon

et al. 2023

Front. Earth Sci.

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The Yan’an Formation of the Ordos Basin in North China is among the largest and most extensively studied Jurassic coal reservoirs in the world. The lacustrine Yan’an Formation was investigated near Dongsheng (Ordos Basin, China) in its sequence-stratigraphic context, to understand the factors that controlled the peat accumulation and the cyclicity in the coal-bearing strata. Nine facies, grouped into two facies associations, jointly composed two third-order sequences. These represent lowstand system tracts, extended (lacustrine) system tracts and highstand system tracts. The sequence stratigraphic framework could be established on the basis of correlations of cores and logging from several wells. It appears that the coal development was controlled partly by fluctuations of the lake level. The sequence development controlled the vertical distribution of the coal seams, which mainly developed during extended lacustrine system tracts (= during transgressive stages of the lake) and the early stage of highstand system tracts. Sequence stratigraphy and maceral analysis indicate that basin subsidence and climate were the main controlling factors for the development of the coal seams and the coal-bearing succession. A generic model was established to show the lateral and vertical distribution of coal seams in the large, subsiding lacustrine coal basin with no significant folding or faulting. Special attention is paid to the changing climate conditions. The findings are considered to help deepen the theory of coal formation; they will also help increase the efficacy of coal exploitation in basins such as the Ordos Basin.

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“…The mechanical transport of minerals will be caused by the input of continental clasts in coal seams, which will lead to the migration and enrichment of trace elements in coal carried by a large number of mineral clasts (Wang et al, 2022a;Wang et al, 2022b). The upper coal seam of Xinjier Mine is affected by redox, paleosalinity and paleoclimate in the depositional environment, and the lower coal seam is affected by various geological activities.…”

Section: Influence Of Terrigenous Inputsmentioning

confidence: 99%

Content and distribution of mercury in coal and its relation to depositional environment—A case study on coals from the Shanxi Formation in Huainan Coalfield

et al. 2023

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Mercury in coals might emit into the environment from coal combination, and finally cause environmental pollution. In this paper, 26 coal samples were selected from No. 1 which is coal in the Shanxi Formation of Zhangji and Xinjier mines in the Huainan coalfield. The mineralogical and geochemical components of coal samples were determined by DMA-80 mercury-measuring instrument, XRF, XRD, ICP-MS, and the relationship between the depositional environment of the coal seam and mercury enrichment was analyzed. The results show that the mercury content of coal in the study area ranged from 0.03 to 0.93 μg/g, with an arithmetic means of 0.21 μg/g, higher than the background values of coal in China and the world. The mercury content of Shanxi Formation coal varied among different mines, the arithmetic mean value of mercury in Zhangji coal mine and Xinjier mine coal is 0.35 μg/g and 0.12 μg/g respectively. Due to the complex depositional environment and depositional facies, the distribution of mercury content in the coal seam is quite different. XRD, Microscopic observation and the ratio of (CaO + MgO + Fe2O3)/(SiO2+ Al2O3) and Al2O3/TiO2 show that the main mineral in the depositional environment of this study area is kaolinite, quartz and pyrite, and the depositional facies are intercontinental and sea-land, so the parent rock type belongs to acid bedrock. The Ni/Co, Sr/Ba, and Sr/Cu ratios were used to indicate a weak oxidation-reduction, Marine salt water, and an arid and hot environment. The vertical distribution of mercury in coal and the characteristics of the depositional environment are combined to show that mercury in coal is easily affected by redox conditions, paleosalinity and paleoclimate in the depositional environment. At the same time, mercury accumulation is more easily in the depositional environment dominated by seawater intrusion than in the terrigenous input.

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Geochemical characteristics and paleoclimate implication of Middle Jurassic coal in the Ordos Basin, China

Cited by 23 publications

References 42 publications

Reconstruction of provenance and tectonic setting of the Middle Jurrasic Yan'an Formation (Ordos Basin, North China) by analysis of major, trace and rare earth elements in the coals

Reconstruction of provenance and tectonic setting of the Middle Jurrasic Yan'an Formation (Ordos Basin, North China) by analysis of major, trace and rare earth elements in the coals

Sequence stratigraphy of the Middle Jurassic Yan’an Formation (NE Ordos Basin, China), relationship with climate conditions and basin evolution, and coal maceral’s characteristics

Content and distribution of mercury in coal and its relation to depositional environment—A case study on coals from the Shanxi Formation in Huainan Coalfield

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