华南下扬子区下奥陶统仑山组:岩石学、地层学和古地理学<sup>*</sup>

doi:10.7605/gdlxb.2016.03.029

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Abstract The Lunshan Formation is one of the lowest stratigraphic units of the Lower Ordovician in the Lower Yangtze Region in South China. The formation is characterized by massive dolostone in comparison with other contemporaneous lithological units,and extends widely. A detailed analysis on the Lunshan Formation at Hongjia section of Chizhou County, Anhui Province, as well as a comprehensive review of the previous studies, indicates that the Lunshan Formation consists of dolostone,lime dolostone,dolomitic limestone,and minor,intercalated grainstone and packstone. The upper boundary of the formation is marked by the occurrence of medium- to thick-bedded bioclastic grainstone and packstone in the study area. The lower boundary of the formation is marked by occurrence of dolomitic limestone or lime dolostone in inner,northern and southeastern Lower Yangtze Region and occurrence of dolostone in most parts of southern Lower Yangtze Region. Although fossils are commonly rare in the Lunshan Formation,five conodont biozones are established in an ascending order:Monocostatus sevierensis biozone,Acanthodus lineatus-A. costatus biozone, Scolopodus? pseudoplanus biozone, Glyptoconus quadraplicatus biozone,and Paltodus deltifer-Tripodus proteus biozone, corresponding to the early Tremadocian of Early Ordovican. The Lunshan Formation was deposited in shallow subtidal to deep subtidal settings. The spatial changes in the thickness of the formation as well as those of dolostone were mainly controlled by palaeogeographic factors. The sedimentary properties of dolomite in the Lunshan Formation imply that these dolostones were mostly formed by penecontemporaneous dolomitization superimposed with moderate burial dolomitization.

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	Li Jiateng
	Liu Jianbo
	Sun Yongchao
	Yan Zhen
	Wu Rongchang
	Zhan Renbin

Key words： stratigraphy palaeogeography dolostone Lunshan Formation Lower Ordovician Lower Yangtze Region

Received: 20 July 2015 Published: 01 June 2016

ZTFLH:

P531

Fund:Co-funded by the National Natural Science Foundation of China(Grant No.41272035,41221001,41290260)and the foundation of the State Key Laboratory of Palaeobiology and Stratigraphy

Corresponding Authors: Liu Jianbo,born in 1966,is a professor in Peking University. He is mainly engaged in paleontology,sedimentology and geobiology. E-mail: jbliu@pku.edu.cn. E-mail: lijiateng@pku.edu.cn。

Cite this article:

Li Jiateng,Liu Jianbo,Sun Yongchao et al. On the Lower Ordovician Lunshan Formation in Lower Yangtze Region, South China:Its petrology, stratigraphy and palaeogeography[J]. JOPC, 2016, 18(3): 411-423.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.03.029 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I3/411

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