DOI: 10.1016/j.earscirev.2020.103474
论文题名: Synthesis of a chrono- and biostratigraphical framework for the Lower Cretaceous of Jiuquan, NW China: Implications for major evolutionary events
作者: Zheng D. ; Wang H. ; Li S. ; Wang B. ; Jarzembowski E.A. ; Dong C. ; Fang Y. ; Teng X. ; Yu T. ; Yang L. ; Li Y. ; Zhao X. ; Xue N. ; Chang S.-C. ; Zhang H.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 213 语种: 英语
中文关键词: Biostratigraphy
; Early Cretaceous
; Geochronology
; Jehol Biota
; Jiuquan
; OAEs
英文关键词: basalt
; biostratigraphy
; chronostratigraphy
; Cretaceous
; fossil
; geochronology
; inland sea
; marine environment
; China
; Gansu
; Jiuquan
; Ephemeropsis
; Magnoliophyta
英文摘要: With a depositional history spanning the early Aptian to early Albian (~19 mys), the Lower Cretaceous Xinminpu Group in Jiuquan, NW China provides detailed record of an inland ecosystem responding to global climatic and environmental changes. The Xinminpu Group exhibits the most typical elements of the Jehol Biota found outside NE China, a highly diverse avifauna and a mid-Cretaceous angiosperm flora. The absence of a comprehensive stratigraphical framework for this area however limits the degree to which the unit can be interpreted relative to coeval sections and the geological records in genera. Recent fossil discoveries and radio-isotopic age data can provide a more detailed biostratigraphical and chronostratigraphical framework for Lower Cretaceous units around Jiuquan. The data complied here indicate that the Chijinpu Formation correlates with the middle-upper Yixian and lower Jiufotang formations of NE China making it early Aptian in age, and the Xiagou Formation correlates with the upper Jiufotang and Shahai formations making it late early Aptian-early Albian in age. This research further reports a novel zircon U-Pb age constraint of 112.4 ± 0.3 Ma for a basalt sample from the lowermost Zhonggou Formation, which is supported to be correlated with the Fuxin Formation of early Albian age. The Chijinpu Formation contains typical elements of the Jehol Biota, i.e. the Eosestheria-Lycoptera-Ephemeropsis trisetalis assemblage, confirming the interpretation that the Jehol Biota had reached Jiuquan during its second evolutionary stage. The Xiagou Formation contains the amphibious avifauna appearing just above OAE1a, indicating a close link between the early Ornithuromorpha evolution and early Aptian global climate changes. The Zhonggou Formation in Jiuquan records the first appearance of an angiosperm flora above OAE1b. Depositional indicators suggest a humid climate with a gradual shift to arid conditions during this time. This review paper laid foundation for the systematic study of the well-preserved Early Cretaceous ecosystem in Jiuquan, allowing to understand correlations between inland and marine environments as recorded in sediments from this critical period. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166558
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, 210008, China; Department of Earth Sciences, The University of Hong Kong, Hong Kong; Department of Earth Sciences, The Natural History Museum, London, SW7 5BD, United Kingdom; School of the Earth Sciences and Resources, University of Geosciences, Beijing, 100083, China
Recommended Citation:
Zheng D.,Wang H.,Li S.,et al. Synthesis of a chrono- and biostratigraphical framework for the Lower Cretaceous of Jiuquan, NW China: Implications for major evolutionary events[J]. Earth Science Reviews,2021-01-01,213