Microfossil Assemblages and Indication of the Source and Preservation Pattern of Organic Matter from the Early Cambrian in South China

Zheng, Shucan; Feng, Qinglai; Velde, Sebastiaan van de; Chang, Shan Chwen; Zhang, Lei; Gao, Bo

doi:10.1007/s12583-020-1117-0

Cited by 7 publications

(3 citation statements)

References 106 publications

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“…These fossils unexpectedly occurred immediately after the end‐Permian extinction with a mode of preservation that agrees well with Lagerstätte forms. Moreover, the taphonomic window of the Kejiao section links low oxygen conditions with exceptional preservation similar to that of many Cambrian Lagerstätten (Harper et al., 2019; Zheng et al., 2022) and is compatible with the hypoxia tolerance of sponges.…”

Section: Introductionmentioning

confidence: 84%

“…The phylogenomic dataset available supports sponges at the base of the metazoan tree of life (Simion et al., 2017). The Ediacaran‐Cambrian rise of sponges is believed to have played a role in the initiation of seawater oxygenation by redistributing organic carbon while oxygenating ambient environments through their ability to filter suspended organic matter from seawater, aiding the diversification of modern‐type ecosystems (Chang et al., 2019; Zheng et al., 2022). Modern experiments show that sponges have the potential to support the whole ecosystem by transforming dissolved organic matter into particulate detritus that are beneficial for higher trophic levels (de Goeij et al., 2013), and this ecological role extends even to deep‐sea environments (Bart et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

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New keratose sponges after the end‐Permian extinction provide insights into biotic recoveries

Wu,

Reitner,

Harper

et al. 2023

Geobiology

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We challenge the prevailing view that the end‐Permian extinction impeded the Triassic evolution of sponges. Here, we report a deep‐water community dominated by abundant keratose sponges in the lowest Triassic strata from Southwest China. The sponge fossils occur as dark elliptical imprints in mudstone with distinct oscula on their tops. The structure of preserved fibers suggests closest affinity with the extant Dictyoceratida, an aspiculate demosponge. The exceptional preservation plays a crucial role in retaining their exquisite structures. Sedimentary, taphonomic, pyrite framboid, and trace elemental analyses indicate that the sponges proliferated in an oxygen‐poor habitat, demonstrating the high tolerance of sponges to severe conditions. Sponge proliferation is a signal of environmental upheaval but they also stabilized the ecosystem, driving the first phase of biotic recovery after the end‐Permian extinction.

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Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

New keratose sponges after the end‐Permian extinction provide insights into biotic recoveries

Wu,

Reitner,

Harper

et al. 2023

Geobiology

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“…Moisture has been widely noted to have a significant negative effect on methane adsorption capacity. ,− Methane adsorption experiments have illustrated that n 0 values under moisture-equilibrated conditions mainly account for 30–90% of those under dry conditions for shale samples worldwide (Figure ), with an average proportion of 64.5%. ,− This proportion factor was thus utilized to regulate methane adsorption capacity for actual water-bearing shale reservoirs. D was assigned as fixed value of 1.09 × 10 –2 mol 2 kJ –2 , which is the mean D value of whole shale samples with TOC content > 2.0 wt.% (Table ), since D is primarily correlated to the intrinsic properties of the shale samples.…”

Section: Discussionmentioning

confidence: 99%

Investigations on Supercritical Methane Adsorption and Storage in the Lower Longmaxi Shale of Nanchuan Area, Southeast Sichuan Basin

Zhang

Xiao

et al. 2023

Energy Fuels

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A series of high-pressure methane adsorption measurements were performed at various temperatures on whole shale and kerogen samples collected from the Lower Longmaxi shale in the Nanchuan area, southeast Sichuan Basin, to investigate supercritical methane adsorption properties and evaluate in-place methane storage capacity as a function of burial depth. The results show that the supercritical Dubinin−Radushkevich (SDR) model fits the excess adsorption isotherms marginally better than the supercritical Langmuir model. However, the fitted adsorbed methane density of kerogens obtained from the SDR model may be greater than the liquid methane density at the atmospheric boiling point (0.423 g/cm 3 ). The proposed multiple regression fitting carried out in this work illustrates that approximately 57.59% (34.51−85.45%) and 37.60% (10.74−59.52%) of the methane adsorption capacity at 333.15 K can be attributed to organic matter (OM) and clay minerals (CMs), respectively, for whole shales investigated. According to thermodynamic analyses, the significant contribution of OM to the methane adsorption capacity can be attributed to the stronger affinity between kerogens and methane molecules in contrast to that between CMs and whole shales. The methane storage capacity estimated as a function of burial depth showed that the adsorbed gas storage capacity declines with increasing burial depth between 2000 and 5000 m, while the free gas storage capacity shows the opposite trends. Gas accumulation pressure primarily exerts a significant effect on the free gas storage capacity rather than adsorbed gas storage capacity, and adsorbed gas storage capacity begins to exceed free gas storage capacity at shallow burial depths for normally pressured gas accumulations. Normally pressured shale gas accumulations at shallow burial depths, which are widely distributed in the residual syncline of the study area, should be given more attention due to their relatively low development costs and relatively high storage capacity for adsorbed gas.

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Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China

Qiao,

Cui,

Xing

et al. 2024

J. Earth Sci.

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Microfossil Assemblages and Indication of the Source and Preservation Pattern of Organic Matter from the Early Cambrian in South China

Cited by 7 publications

References 106 publications

New keratose sponges after the end‐Permian extinction provide insights into biotic recoveries

New keratose sponges after the end‐Permian extinction provide insights into biotic recoveries

Investigations on Supercritical Methane Adsorption and Storage in the Lower Longmaxi Shale of Nanchuan Area, Southeast Sichuan Basin

Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China

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