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Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform, South China
Sun, Xiaojuan (孙晓娟)1,2; Heubeck, Christoph1,3; Steiner, Michael1; Yang, Ben4
2020-01-15
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号538页码:17
摘要

Terreneuvian strata from the western Yangtze Platform host diverse assemblages of small shelly fossils (SSFs), which are key for understanding the Cambrian Bioradiation Event and have been the objects of numerous geochemical studies to understand environmental factors during Fortunian and Cambrian Age 2. The region has been proposed to host the vacant stratotype of Cambrian Stage 2. However, a comprehensive study of paleogeography and evolution of sedimentary facies for the Terreneuvian is still lacking. Here we present a detailed sedimentological and petrographic study of six stratigraphic sections from the western Yangtze Platform. Eleven depositional environments (fades associations) are proposed based on the characterization of twenty-five facies. We further reconstruct palaeogeographic model based on the evolution of depositional environments and discuss the formation of phosphorites. The Zhujiaqing Formation deposited diachronously on the Ediacaran strata, and facies associations range from tidal flats, shoal, back-shoal to semi-restricted and energetic subtidal. As sedimentation continued, protected shallow subtidal became widespread. Evidence presented from the Zhujiaqing Formation indicates that strata in the laolin section are more continuous than those on other parts of the Yangtze Platform. However, stratigraphic condensation and the protected and partly restricted environment should be taken into consideration when discussing a proposed global GSSP "Laolinian Stage" (Cambrian Stage 2). In-situ phosphates formed in various environments, which argues against the previous assumption that primary phosphate formed only in isolated embayments. Concentration of granular phosphorites occurred in shoal areas by winnowing and reworking of in-situ phosphate and phosphatized skeletons, while in the infra-platform basin, repeated alternations of syndepositional phosphogenesis, current reworking, and amalgamation of storm-generated phosphatic event beds contributed to the concentration of granular phosphorites.

关键词Stratigraphic condensation Carbonate platform Phosphogenesis Zhujiaqing formation Cambrian stage 2 Cambrian biomineralization
DOI10.1016/j.palaeo.2019.109424
收录类别SCI
语种英语
关键词[WOS]CARBON-ISOTOPE ; FOSSIL ASSEMBLAGES ; BOUNDARY INTERVAL ; XIAOTAN SECTION ; EDIACARAN ; EVOLUTION ; YUNNAN ; CHRONOSTRATIGRAPHY ; HISTORY ; RECORD
资助项目German Research Foundation (DFG)[He2418/4-2] ; German Research Foundation (DFG)[FOR 736] ; National Natural Science Foundation of China[41672029]
WOS研究方向Physical Geography ; Geology ; Paleontology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号WOS:000508751800042
项目资助者German Research Foundation (DFG) ; National Natural Science Foundation of China
出版者ELSEVIER
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/31392
专题中国科学院南京地质古生物研究所
通讯作者Sun, Xiaojuan (孙晓娟)
作者单位1.Free Univ Berlin, Inst Geol Sci, Malteserstr 74-100, D-12249 Berlin, Germany
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Univ Jena, Dept Geosci, Burgweg 11, D-07749 Jena, Germany
4.Chinese Acad Geol Sci, Inst Geol, Baiwanzhuang St 26, Beijing 100037, Peoples R China
第一作者单位中国科学院南京地质古生物研究所
通讯作者单位中国科学院南京地质古生物研究所
推荐引用方式
GB/T 7714
Sun, Xiaojuan ,Heubeck, Christoph,Steiner, Michael,et al. Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,538:17.
APA Sun, Xiaojuan ,Heubeck, Christoph,Steiner, Michael,&Yang, Ben.(2020).Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,538,17.
MLA Sun, Xiaojuan ,et al."Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform, South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 538(2020):17.
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