重庆秀山小茶园锰矿南华系大塘坡组古环境<sup>*</sup>

doi:10.7605/gdlxb.2016.03.033

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Abstract In order to provide a new understanding of sedimentary tectonic setting of the Nanhua system for manganese ore exploration in Chongqing-Hubei-Hunan area,we carried out sedimentological and geochemical analyses of the Qianzimen and Datangpo Formations of Nanhua System from Core ZK0606 at Xiaochayuan Manganese Deposit in Xiushan area of Chongqing. Based on the sedimentological analysis results,three kinds of sedimentary facies were distinguished,including shallow glacial marine,limited marginal basin and shallow shelf. The geochemical analysis data of higher total REE,LREE-rich,with a negative Eu anomaly,ratios of Al₂O₃/(Al₂O₃+Fe₂O₃)and Al/(Al+Fe+Mn)reflect that the Datangpo Formation deposited in a passive continental margin. The trace element content and ratios(U,V,Mo,V/Cr)show that the Member 1 of Datangpo Formation formed in the anoxic environment,with a gradual transition to oxic environments in the Member 2 of Datangpo Formation. The Al/Ca ratios and the chemical index of alteration(CIA)indicate that the chemical weathering and terrigenous supply were gradually increased from bottom to top, correspondind to the end of Sturtian glaciation,global warming and sea level rise. Based on the above analyses,it is indicated that the Manganese ore mainly formed in limited marginal basin with relatively deep water and anoxic conditions during the depositional period of lower section of the Member 1 of Datangpo Formation.

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	Ma Zhixin
	Luo Liang
	Liu Xiting
	Liu Wei
	Sun Zhiming

Key words： Nanhua System geochemistry sedimentary environment Chongqing

Received: 06 May 2015 Published: 01 June 2016

ZTFLH:

P534.41

Cite this article:

Ma Zhixin,Luo Liang,Liu Xiting et al. Palaeoenvironment of the Datangpo Formation of Nanhua System in Xiaochayuan Manganese Deposit in Xiushan area of Chongqing[J]. JOPC, 2016, 18(3): 473-486.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.03.033 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I3/473

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