Meganodular limestone of the Pagoda Formation: A time-specific carbonate   facies in the Upper Ordovician of South China

doi:10.1016/j.palaeo.2015.07.039

CORC > 北京大学 > 地球与空间科学学院

	Meganodular limestone of the Pagoda Formation: A time-specific carbonate facies in the Upper Ordovician of South China
	Zhan, Renbin ; Jin, Jisuo ; Liu, Jianbo ; Corcoran, Patricia ; Luan, Xiaocong ; Wei, Xin
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2016
关键词	Late Ordovician Pagoda Formation Network structure Time-specific carbonate facies South China DIAGENESIS SHALES
DOI	10.1016/j.palaeo.2015.07.039
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 modem 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. (C) 2015 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China (NSFC) [41221001, 41290260]; Natural Sciences and Engineering Research Council of Canada (NSERC); State Key Laboratory of Palaeobiology and Stratigraphy; IGCP Project: The Early to Middle Paleozoic Revolution [591]; SCI(E); ARTICLE; rbzhan@nigpas.ac.cn; ,SI; 349-362; 448
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438296]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhan, Renbin,Jin, Jisuo,Liu, Jianbo,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.
APA	Zhan, Renbin,Jin, Jisuo,Liu, Jianbo,Corcoran, Patricia,Luan, Xiaocong,&Wei, Xin.(2016).Meganodular limestone of the Pagoda Formation: A time-specific carbonate facies in the Upper Ordovician of South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY.
MLA	Zhan, Renbin,et al."Meganodular limestone of the Pagoda Formation: A time-specific carbonate facies in the Upper Ordovician of South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY (2016).