DOI: 10.1016/j.palaeo.2015.07.039
论文题名: Meganodular limestone of the Pagoda Formation: A time-specific carbonate facies in the Upper Ordovician of South China
作者: Zhan R. ; Jin J. ; Liu J. ; Corcoran P. ; Luan X. ; Wei X.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 448 起始页码: 349
结束页码: 362
语种: 英语
英文关键词: Late Ordovician
; Network structure
; Pagoda Formation
; South China
; Time-specific carbonate facies
英文摘要: The decimeter-scale 3-D network structure of the Upper Ordovician Pagoda Formation in South China has been an enigmatic sedimentary feature and a case of non-uniformitarian carbonate depositional system, without modern analog. The network bands are developed pervasively throughout the entire Pagoda Formation, superficially resembling desiccation or syneresis cracks, especially in bedding-plane view, with decimeter-scale sub-polygonal to irregularly sinuous patterns. Detailed petrographic analysis, however, shows that the crack-like network bands have the same carbonate matrix, skeletal grains, and overall fabrics as the rock they surround. In this study, we demonstrate that the network structure is not generated by shrinkage cracks but is rather a time-specific lithofacies. It originated from prolonged growth of nodular carbonate, controlled by the convergence of several geological and paleoclimatic factors, including a) a protracted sea-level highstand lasting for about 5 Myr, b) an interval of tectonic quiescence favoring the dominance of carbonate production, with minimal siliciclastic input, and c) location of the South China paleoplate in the hurricane-free paleoequatorial zone devoid of severe storm disturbances between the fairweather and maximum storm wave bases (normally 15-120 m depths), favoring long-term, uninterrupted growth of CaCO3 meganodules on a mid-shelf substrate. This study corroborates recent paleogeographic reconstructions that position the South China paleoplate on the Equator during the Late Ordovician. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68504
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China; Department of Earth Sciences, Western University, London, ON, Canada; Institute of Paleontology and Paleoenvironment, School of Earth and Space Sciences, Peking University, China
Recommended Citation:
Zhan R.,Jin J.,Liu J.,et al. Meganodular limestone of the Pagoda Formation: A time-specific carbonate facies in the Upper Ordovician of South China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,448