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

Wang, Shuai; Shao, Longyi; Yan, Zhiming; Shi, Ming-Jian; Zhang, Yunhe

doi:10.1186/s42501-019-0035-5

Cited by 16 publications

(16 citation statements)

References 40 publications

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“…Charcoal particles potentially indicative of wildfire activity have been reported from strata of Aptian age (Brown et al, 2012;Wang et al, 2019), although not from the Selli Level Equivalent specifically, or in any of the nine sites studied here and by . Thus, there is no positive evidence that the widespread Hg influxes were the result of wildfires, although such a source cannot be completely ruled out.…”

Section: Volcanic Vs Terrestrial Sources Of Hg To Marine Environments...mentioning

confidence: 63%

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Percival

Tedeschi

Creaser

et al. 2021

Global and Planetary Change

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Section: Volcanic Vs Terrestrial Sources Of Hg To Marine Environments...mentioning

confidence: 63%

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Percival

Tedeschi

Creaser

et al. 2021

Global and Planetary Change

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“…The distribution has several defining characteristics. First, dull coal is concentrated at the coal top and coal bottom, perhaps due to peat marsh exposure and increased amounts of pyrofusinite with enhanced fusainization . Second, we found a genetic relationship between each sublayer in the vertical direction.…”

Section: Resultsmentioning

confidence: 64%

“…First, dull coal is concentrated at the coal top and coal bottom, perhaps due to peat marsh exposure and increased amounts of pyrofusinite with enhanced fusainization. 34 Second, we found a genetic relationship between each sublayer in the vertical direction. The vertical distribution in the four wells including 0403, 0404, 1401, and 4002 shows that the proportion of one coal macrolithotype cross is approximately 30%.…”

Section: Resultsmentioning

confidence: 69%

Coal Macrolithotype Distribution and Its Genetic Analyses in the Deep Jiaozuo Coalfield Using Geophysical Logging Data

et al. 2021

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Coal macrolithotypes are closely correlated with coal macerals and pore–fracture structures, which greatly influence the changes in gas content and the coal structure. Traditional macrolithotype identification in coalbed methane (CBM) wells mostly depends on core drilling observation, which is expensive, time-consuming, and difficult for broken core extraction. Geophysical logging is a quick and effective method to address this issue. We obtained coal cores from 75 wells in the deep regions of the Jiaozuo Coalfield, northern China, quantitatively analyzed the logging cutoff number corresponding to various macrolithotypes, and established natural γ (GR), deep lateral resistivity (LLD), and γ–γ log (GGL) response rules for each coal macrolithotype. The formation mechanisms of different coal macrolithotypes are discussed from the perspective of coal facies and pore structures. The results show that GGL decreased but GR and LLD increased from bright coal to dull coal. Most coal macrolithotypes can be distinguished based on the established thresholds of various logging curves. However, excessively high or low ash yields significantly affect the validity of identification. The vertical coal macrolithotypes attributed to the peat marsh environment in Shanxi Formation mostly comprise three to six sublayers; dull or semi-dull coals are predominant close to the 2 1 coal seam, and the bright or semi-bright types usually appear in the middle part. The semi-bright and bright coals are usually vitrinite rich, whereas the semi-dull and dull coals are primarily inertinite rich. For pore structure arguments, the highest average specific surface area ( S BET ) and the total pore volume ( V BJH ) are found in bright coals, followed by dull and semi-bright coals; those of semi-dull coals are the lowest. However, S BET and V BJH change significantly for different samples, even though the coal macrolithotype is the same. Therefore, the macrolithotype is not the key factor determining the coal parameters of pore structures. Rapid and effective identification of coal macrolithotypes can help determine the CBM enrichment area, the CBM well location, and the exploration horizon.

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“…Fusinite orig i nates from ligno-cel lu losic cell walls. The bo tan i cal af fin ity of fusinite can be es tab lished when the cell struc ture is well-pre served ICCP, 2001a, b).It is sug gested that the lig nite seam ex am ined from the JóŸwin de posit was af fected by fire (Wang et al, 2019). A detritic lig nite sam ple was col lected from the JóŸwin de posit (1B).…”

Section: Resultsmentioning

confidence: 99%

CO2 sorption properties of selected lithotypes of lignite from Polish deposits

Bielowicz

Baran

2019

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P., 2019. CO 2 sorp tion prop er ties of se lected lithotypes of lig nite from Pol ish de pos its. Geo log i cal Quar terly, 63 (4): 786-800, doi: 10.7306/gq.1508 As so ci ate ed i tor: Wojciech Drzewicki Sorp tion stud ies, to de ter mine the CO 2 sorp tion ca pac ity of coal, were car ried out us ing eight ortho-lig nite sam ples of dif ferent lithotypes, to in ves ti gate the pos si bil ity of CO 2 stor age in lig nite de pos its. Equa tions de ter min ing a num ber of pa ram e ters and in di ca tors used to de lin eate the ex per i men tal data and to dif fer en ti ate the sam ples ex am ined in clude: Langmuir isotherms; the Dubinin-Radushkevich (DR) equa tion that de scribes the the ory of vol ume fill ing of micropores; and the Brunauer, Emmett and Teller (BET) equa tion used to cal cu late the vol ume and sur face area of a monolayer. The re sults ob tained were com pared with the petrographic com po si tion and ul ti mate and prox i mate anal y sis of lig nite. There is a large cor re la tion between sorp tion and petrographic com po si tion, a pos i tive im pact of the Gelification In dex on the sorp tion pro cess and a clear re la tion ship be tween the sorp tion (Langmuir and DR) and ash con tent. The best CO 2 sorp tion prop er ties were found for xylo-detritic and detro-xylitic lig nites. Based on the tests car ried out, a pre lim i nary as sess ment of the suit abil ity of lig nite for CO 2 stor age can be made. Na tions Frame work Clas si fi ca tion of Re sources (UNFC). As of De cem ber 31, 2016, 91 lig nite de pos its were ex plored in Poland, of which 74 were doc u mented and are still un de vel oped. Pol ish extractable lig nite re sources amount to 1,129.06 mil lion tons, which is ~0.8% of the global re serves of this type (PGI-NRI, 2017). Lig nite de pos its whose ex ploi ta tion is not econom i cally vi a ble can be used for CO 2 se ques tra tion. At ten tion is there fore fo cused on deep lig nite de pos its and seam thick ness, the ex ploi ta tion of which is not eco nom i cally fea si ble. At the same time, the de pos its dis cussed are in su lated de pos its; thus, the pre vail ing geo log i cal con di tions could en able car bon capture and stor age. The geo log i cal and depositional con di tions required for CO 2 stor age are gen er ally sim i lar to the re quire ments for UCG, e.g. the depth of the de posit, thick ness and na ture (low-per me abil ity, struc tur ally co her ent and lat er ally con tin uous) of in su lat ing lay ers, pres ence of ground wa ter res er voirs and the lack of tec tonic dis tur bances in the di rect ex ploi ta tion zone. Stud ies per formed on the pos si bil ity of un der ground gasifi ca tion in Po land have shown that the de pos its at OEcinawa-G³ogów, Gostyñ, Krzywiñ, Wêglewice and Kamieñsk can be po ten tially used for CO 2 stor age (Bielowicz and Kasiñski, 2014). Gen er ally, the lim ited ac cess to sam ples from these lig nite de pos its pre vents sorp tion stud ies. There fore, it is cru cial to de ter mine trends al low ing a pre lim i nary as ...

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

Cited by 16 publications

References 40 publications

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Coal Macrolithotype Distribution and Its Genetic Analyses in the Deep Jiaozuo Coalfield Using Geophysical Logging Data

CO2 sorption properties of selected lithotypes of lignite from Polish deposits

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