A late Paleoproterozoic microfossil community from siliceous granules, Dahongyu Formation, North China

Jing, Yinghao; Chen, Zhong‐Qiang; Tu, Chenyi

doi:10.1016/j.precamres.2022.106723

Cited by 5 publications

(8 citation statements)

References 107 publications

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“…It is therefore plausible that shrinkage could explain the occurrence of clear outer rinds described in microfossils from of the rind (see figs. 10 and 11 of Jing et al, 2022). The variability in size and shape of these spheroidal bodies is fully consistent with shrinkage during decomposition (Golubic & Hofmann, 1976;Knoll & Barghoorn, 1975).…”

Section: Timing Of Silicificationsupporting

confidence: 53%

“…Clear outer rinds are unusual but are not unknown from the fossil record. They have been documented in fossilised micro‐organisms from younger deposits and have been variously interpreted as being of diagenetic origin (Anderson et al, 2019; Xiao et al, 2000), taphonomic origin (Jing et al, 2022), or the remains of something inherent to the original micro‐organism (Kazmierczak & Kremer, 2009; Sergeev, 1994).…”

Section: Discussionmentioning

confidence: 99%

“…Figure S8 and Figure 10). Where the shape of the SAs and their surrounding rinds is ellipsoidal, the long axis is either parallel to (Figure 2b) or, more commonly, perpendicular to (Figure 1a; taphonomic origin (Jing et al, 2022), or the remains of something inherent to the original micro-organism (Kazmierczak & Kremer, 2009;Sergeev, 1994).…”

Section: Timing Of Silicificationmentioning

confidence: 99%

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Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

Barlow,

House,

Liu

et al. 2023

Geobiology

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The great oxidation event (GOE), ~2.4 billion years ago, caused fundamental changes to the chemistry of Earth's surface environments. However, the effect of these changes on the biosphere is unknown, due to a worldwide lack of well‐preserved fossils from this time. Here, we investigate exceptionally preserved, large spherical aggregate (SA) microfossils permineralised in chert from the c. 2.4 Ga Turee Creek Group in Western Australia. Field and petrographic observations, Raman spectroscopic mapping, and in situ carbon isotopic analyses uncover insights into the morphology, habitat, reproduction and metabolism of this unusual form, whose distinctive, SA morphology has no known counterpart in the fossil record. Comparative analysis with microfossils from before the GOE reveals the large SA microfossils represent a step‐up in cellular organisation. Morphological comparison to extant micro‐organisms indicates the SAs have more in common with coenobial algae than coccoidal bacteria, emphasising the complexity of this microfossil form. The remarkable preservation here provides a unique window into the biosphere, revealing an increase in the complexity of life coinciding with the GOE.

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Section: Timing Of Silicificationsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Timing Of Silicificationmentioning

confidence: 99%

See 1 more Smart Citation

Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

Barlow,

House,

Liu

et al. 2023

Geobiology

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“…Raman spectroscopy is employed to understand the taphonomic pathway of the sponge material. The Raman spectra of the dark fossil remains possess two distinct bands at wave‐length numbers 1350 and 1580 cm −1 (Figure 5c–f), typical of organic carbon (Ferrari & Robertson, 2000; Jing et al., 2022). D (disordered carbon) and G (graphite) bands are very sharp and indicate strong maturation of the organic carbon, while the Raman spectra of the surrounding mudstone lack such bands.…”

Section: Resultsmentioning

confidence: 99%

“…Well‐preserved sponge samples were selected for Raman analysis using the WiTec alpha300 R confocal Raman spectrometer at the University of Göttingen in Germany. The Raman spectra were obtained under a 532 nm wavelength laser at a power of 4.974 mW in a range of 75–4000 cm −1 at a 1 cm −1 resolution (Jing et al., 2022).…”

Section: Methodsmentioning

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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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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Genesis and reservoir preservation mechanism of 10 000‐m ultradeep dolomite in Chinese craton basin

Zhu,

Li,

Zhao

et al. 2024

Deep Underground Science and Engineering

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The 10 000‐m ultradeep dolomite reservoir holds significant potential as a successor field for future oil and gas exploration in China's marine craton basin. However, major challenges such as the genesis of dolomite, the formation time of high‐quality reservoirs, and the preservation mechanism of reservoirs have always limited exploration decision‐making. This research systematically elaborates on the genesis and reservoir‐forming mechanisms of Sinian–Cambrian dolomite, discussing the ancient marine environment where microorganisms and dolomite develop, which controls the formation of large‐scale Precambrian–Cambrian dolomite. The periodic changes in Mg isotopes and sedimentary cycles show that the thick‐layered dolomite is the result of different dolomitization processes superimposed on a spatiotemporal scale. Lattice defects and dolomite embryos can promote dolomitization. By simulating the dissolution of typical calcite and dolomite crystal faces in different solution systems and calculating their molecular weights, the essence of heterogeneous dissolution and pore formation on typical calcite and dolomite crystal faces was revealed, and the mechanism of dolomitization was also demonstrated. The properties of calcite and dolomite (104)/(110) grain boundaries and their dissolution mechanism in carbonate solution were revealed, showing the limiting factors of the dolomitization process and the preservation mechanism of deep buried dolomite reservoirs. The in situ laser U‐Pb isotope dating technique has demonstrated the timing of dolomitization and pore formation in ancient carbonate rocks. This research also proposed that dolomitization occurred during the quasi‐contemporaneous or shallow‐burial periods within 50 Ma after deposition and pores formed during the quasi‐contemporaneous to the early diagenetic periods. And it was clear that the quasi‐contemporaneous dolomitization was the key period for reservoir formation. The systematic characterization of the spatial distribution of the deepest dolomite reservoirs in multiple sets of the Sinian and the Cambrian in the Chinese craton basins provides an important basis for the distribution prediction of large‐scale dolomite reservoirs. It clarifies the targets for oil and gas exploration at depths over 10 000 m. The research on dolomite in this study will greatly promote China's ultradeep oil and gas exploration and lead the Chinese petroleum industry into a new era of 10 000‐m deep oil exploration.

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A late Paleoproterozoic microfossil community from siliceous granules, Dahongyu Formation, North China

Cited by 5 publications

References 107 publications

Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

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

Genesis and reservoir preservation mechanism of 10 000‐m ultradeep dolomite in Chinese craton basin

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