Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition

Li, Na; Li, Chao; Fan, Junxuan; Algeo, Thomas J.; Yan, Detian; Zhu, Guangyou; Wu, Shiyong; Tang, Shida; Jin, Chengsheng

doi:10.1016/j.palaeo.2019.109281

Cited by 50 publications

(24 citation statements)

References 112 publications

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“…As mentioned above, the redox conditions of the water column in the study area during the O-S period, especially the distribution of euxinia, showed obvious spatiotemporal heterogeneity. Liu et al (2016) and Li et al (2019), Li et al (2021) explained this phenomenon in terms of tectonic movement, CIA intensity, and sulfate availability. On this basis, our study further explored the control mechanism of euxinia development using detailed geochemical data.…”

Section: Controls On the Development Of Euxinia In Yangtze Basinmentioning

confidence: 94%

“…This dividing line has been used to determine the estimated duration of a single graptolite zone (Melchin, 2008;Cooper et al, 2012): D. complexus (0.6 Myr), P. pacificus (1.86 Myr), M. extraordinarius (0.73 Myr), M. persulptus (0.60 Myr), and A. ascensus (0.43 Myr). These data have been used to calculate the linear sedimentation rate (LSR) of each graptolite zone (Li et al, 2019).…”

Section: Biostratigraphic Frameworkmentioning

confidence: 99%

“…The paleo-ocean during the transition from the Late Ordovician to the Early Silurian (O-S) in the Upper Yangtze Basin, South China, has been widely studied with respect to the sedimentary environment (Wang et al, 2016;Li et al, 2017;Liang et al, 2017;Wu et al, 2019;Wang et al, 2021), redox conditions (Li et al, 2019;Liu et al, 2019;Wang et al, 2019), and sea level change (Wang et al, 2017;Jin et al, 2020). During this period, a set of organic-rich black shale was deposited, including the Wufeng Formation (WF, Katian-Hirnantian) and Longmaxi Formation (LMX, Hirnantian-Rhuddanian), which have become the main targets for shale gas exploration in China (Zou et al, 2016;Zou et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The latest research on marine redox conditions in this area indicates that the source weathering intensity and effectiveness of sulfate may be the main controlling factors for the development of anoxic water columns, especially euxinia (Zou et al, 2018;Li et al, 2019;Li et al, 2021). However, because of the lack of highresolution geochemical records, especially the lack of research evidence on paleo-ocean topography and external ocean current communication in the continental margin area, the controlling factors of redox conditions in the Upper Yangtze Basin water column need to be explored further.…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Evolution and Genesis of the Late Ordovician—Early Silurian Marine Euxinia in Northeastern Upper Yangtze Basin, South China

Wang

Dong

et al. 2021

Front. Earth Sci.

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Marine redox conditions and their dynamic changes were a major factor that controlled the formation of black shale and caused the late Ordovician marine extinction in the Upper Yangtze Basin (South China). However, the spatiotemporal variation and potential controlling factors of marine redox conditions in this area remain unclear. We analyzed whole-rock geochemistry and pyrite sulfur isotopes (δ34Spy) of 47 shale samples from the Late Katian to Rhuddanian in a shelf-to-slope (Qianjiang Shaba section and Wc-1 well) region of northeastern Upper Yangtze Basin, and reconstructed water column redox conditions during the Late Ordovician–Early Silurian Transition. The geochemical characteristics of shale, including the ratio of elements, discriminant function and ternary diagram location in the study area suggest a passive continental margin sedimentary environment, wherein the terrigenous detritus is mainly derived from felsic igneous rocks in the upper crust, showing characteristics of near-source deposition. The redox indices (Fe speciation, Corg/P, UEF, and MoEF) showed that the development of anoxic water, especially euxinia, has obvious spatiotemporal heterogeneity. Under conditions of high availability of active organic carbon and limited sulfate supply, high active Fe input and strong biological irrigation in the shallow water area may effectively remove H2S produced by microbial sulfate reduction, conducive to the prevalence of ferruginous water columns. However, for this deep water area, the rapid accumulation rate of organic matter, decrease in dissolved Fe (caused by upwelling in the open sea), and seawater stratification (caused by the rising of sea level) promoted the development of a euxinic water column. This inference is supported by the covariant relationship between organic carbon accumulation rate, chemical index of alteration, Co × Mn, and δ34Spy. Our study highlights the potential control effects of sea level change, continental weathering and upwelling on the development of euxinic water columns.

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Section: Controls On the Development Of Euxinia In Yangtze Basinmentioning

confidence: 94%

Section: Biostratigraphic Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Evolution and Genesis of the Late Ordovician—Early Silurian Marine Euxinia in Northeastern Upper Yangtze Basin, South China

Wang

Dong

et al. 2021

Front. Earth Sci.

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“…Deep shale often experiences more complex diagenetic and thermal evolution processes, increasing the heterogeneity of the shales , and making the factors affecting the development of the reservoir unclear (organic matter pores, mineral intercrystalline pores, and microcracks). −, , In addition, although some of the shale in the southern Sichuan Basin is rich in organic matter clumps, it has not yet developed abundant organic matter pores, ,− and research into the mechanism that closes and connects the micronanometer pores in deep shales needs to be expanded upon. Scholars have also reported that production is greatly reduced as the depth of the shale increases, , which also suggests the complexity and particularity of deep organic-rich shale. ,,, …”

Section: Introductionmentioning

confidence: 99%

Pore Systems of the Different Lithofacies of the Longmaxi Formation at Depths Exceeding 3500 m in the Zigong Area, Sichuan Basin

et al. 2020

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The deep Longmaxi Formation shale in the Zigong area is widely distributed and has a huge resource potential, which has enabled it to become one of the most important replacement areas for shale gas exploration in China. This article investigates the key shale gas evaluation well, Well Z1, in the Zigong area using field emission-scanning electron microscopy, mercury intrusion capillary pressure, low-pressure N2/CO2 adsorption, and fractal theory to determine the pore systems of the different lithofacies of the deep O3w–S1l shale. The mineral composition and total organic carbon (TOC) content (1.79%– 8.16%/3.48%) are highly heterogeneous, and five types of shale lithofacies including mixed shale, mixed siliceous, clay-rich siliceous, argillaceous/siliceous shale, and mixed carbonate shale were identified. The deep shale mainly develops interpores and microcracks associated with the organic matter (OM)–mineral (carbonate, pyrite, and clay minerals) aggregates and a small number of mud pores. The surface areas and total pore volume vary from 16.29 to 41.76 m2/g and from 1.19 to 3.49 cm3/100 g, with averages of 25.03 m2/g and 1.99 cm3/100 g, respectively. The pore distribution exhibits significant multimodal and fractal characteristics. The distribution morphology, peak values, and fractal dimensions vary with lithofacies. The mesopores provide the main pore volume (average of 53.99%), and the micropores provide the main surface area (average of 73.95%). The TOC content and biogenic quartz are beneficial to the development of micro- and mesopores. In the Zigong area, mineral aggregates composed of OM and brittle minerals (quartz, feldspar, and carbonate) are more favorable for pore development than the clay mineral–brittle mineral aggregates.

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Characteristics, origins, and significance of pyrites in deep-water shales

Liang,

Ji,

Cao

et al. 2024

Sci. China Earth Sci.

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Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition

Cited by 50 publications

References 112 publications

Spatiotemporal Evolution and Genesis of the Late Ordovician—Early Silurian Marine Euxinia in Northeastern Upper Yangtze Basin, South China

Spatiotemporal Evolution and Genesis of the Late Ordovician—Early Silurian Marine Euxinia in Northeastern Upper Yangtze Basin, South China

Pore Systems of the Different Lithofacies of the Longmaxi Formation at Depths Exceeding 3500 m in the Zigong Area, Sichuan Basin

Characteristics, origins, and significance of pyrites in deep-water shales

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