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A Diverse Microfossil Assemblage from the Ediacaran–Cambrian Deep-Water Chert of the Liuchapo Formation in Guizhou Province,South China

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Journal of Earth Science 2023年第2期34卷 398-408页

作者： Yan Zhang Shan Chang Qinglai Feng Shucan Zheng State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430078China School of Earth Sciences China University of GeosciencesWuhan 430074China College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China School of Architectural Engineering Huanggang Normal UniversityHuanggang 438000China

The Ediacaran to Cambrian transition witnessed great biological and environmental turnovers from the Precambrian to *** changes are also reflected by the fossil records during that ***,the fossil distribution was highly *** diverse fossils were constantly found from the shallow shelf including restricted basins,reports from deep-water areas,which are characterized by chert-dominated formations straddling the Ediacaran-Cambrian boundary,were *** them was the Liuchapo Formation that has been considered *** this study,a fossiliferous assemblage was found from the Liuchapo Formation in east Guizhou Province,South *** assemblage comprises Palaeopascichnus jiumenensis,Horodyskia minor,multicellular algae that possibly related with red algae,cyanobacteria,sponge spicules,small shelly fossils,membrane structures of uncertain affinity,and fossils with structures resemble the Ediacaran *** and Horodyskia have been widely reported and abundant in the Liuchapo Formation and equivalents,while the others have seldomly,or never,been found from this formation or,more widely,the deep-water chert of transitional *** discovery not only contributes to the rare paleontological records preserved in deep-water sediments,but also expanded the geographic distribution of the fossils,providing new materials of biological diversity during this critical interval.

关键词： Liuchapo Formation Early Cambrian latest Ediacaran deep-water chert fossils paleobiology

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A New Species of Amsassia from the Ordovician of Korea and South China:Paleobiological and Paleogeographical Significance

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 796-806页

作者： Mirinae LEE Heeju PARK Nguyen Viet TIEN Suk-Joo CHOH Robert J.ELIAS Dong-Jin LEE Department of Earth and Environmental Sciences Andong National UniversityAndong36729Republic of Korea Institute of Geological Sciences-Vietnam Academy of Science and Technology(IGS-VAST) Hanoi100000Socialist Republic of Vietnam Department of Earth and Environmental Sciences Korea UniversitySeoul02841Republic of Korea Department of Geological Sciences The University of ManitobaWinnipegR3T 2N2Canada

A new species of the probable calcareous alga Amsassia, A. koreanensis, is recognized from the Duwibong Formation （Middle Ordovician, Darriwilian） of the Taebaeksan Basin in mid-eastern Korea. This is the first report of the genus from the Korean Peninsula, expanding its geographical range to the eastern Sino-Korean Block. The new species also occurs in the Xiazhen Formation （Upper Ordovician, Katian） at Zhuzhai in the South China Block. Amsassia koreanensis is the smallest species of this modular genus, having a maximum module diameter of 0.28 ram. Module increase is by bipartite, tripartite and quadripartite types of longitudinal axial fission, but unlike other species of the genus, quadripartite fission is common. The types of fission are comparable to those in some Tetradiida （now Prismostylales, florideophycean rhodophyte algae）, although the processes of fission are different. The distribution of A. koreanensis further strengthens the biogeographical connection between the Sino-Korean and South China blocks, suggesting that these two paleocontinents were located closer together during the Middle to Late Ordovician than previously speculated.

关键词： Amsassia koreanensis sp. nov. Ordovician Sino-Korean Block South China Block paleobiology paleogeography.

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Precipitation of High Mg-Calcite and Protodolomite Using Dead Biomass of Aerobic Halophilic Bacteria

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Journal of Earth Science 2023年第2期34卷 456-466页

作者： Qigao Fan Deng Liu Dominic Papineau Xuan Qiu Hongmei Wang Zhenbing She Linduo Zhao State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430078China School of Environmental Studies China University of GeosciencesWuhan 430078China London Centre for Nanotechnology University College London and Birkbeck College LondonLondon 17-19UK Department of Earth Sciences University College LondonLondon WC1E 6BTUK Center for Planetary Sciences University College LondonLondon WC1E 6BTUK Illinois Sustainable Technology Center Prairie Research InstituteUniversity of Illinois at Urbana-ChampaignChampaign 61820USA

The microbial dolomite model has been used to interpret the origin of sedimentary *** this model,the formation of low-temperature protodolomite,an important precursor to sedimentary dolomite,can be facilitated either by actively metabolizing cells of anaerobic microbes and aerobic halophilic archaea or by their inactive *** halophilic bacteria are widely distributed in(proto-)dolomite-depositing evaporitic environments and their biomass might serve as a template for the crystallization of *** test this hypothesis,carbonation experiments were conducted using dead biomass of an aerobic halophilic bacterium(Exiguobacterium *** JBHLT-3).Our results show that dead biomass of JBHLT-3 can accelerate Mg2+uptake in carbonate mineral *** addition,the amount of Mg incorporated into Ca-Mg carbonates is proportional to the concentration of *** Mg-calcite is produced with 0.25 or 0.5 g/L biomass,whereas protodolomite forms with 1 g/L *** is confirmed by the main Raman peak of Ca-Mg carbonates,which shifts towards higher wavenumbers with increased Mg *** cells and their imprints are preserved on the surface of high Mg-calcite and ***,this study furthers our understanding of the dolomitization within buried and dead microbial mats,which provides useful insights into the origin of ancient dolomite.

关键词： protodolomite high Mg-calcite Mg-hydration effect microbial dead biomass biosignature paleobiology

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