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《Journal of Stratigraphy》 2017-03
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THE AGE AND NATURE OF THE STRATA HOSTING THE DONGPING MANGANESE ORE DEPOSIT IN GUANGXI

HUANG Xiang-lin;LU Gang;GAO Yang;LING Shao-nian;WU Li-he;ZHOU Juan-juan;ZHONG Feng-yun;Guangxi Institute of Regional Geological Survey;310 Guangxi Geological Party,China National Nuclear Corporation;  
The Dongping manganese ore deposit in Guangxi is a large-scale lateritic type Mn ore deposit.The ore deposit consist consists of primary and secondary manganese ore-bearing layers.However,the nature and age of the strata hosting the primary manganese ore-bearing layer are uncertain.Traditionally,the hosting strata were regarded as part of the Beisi Formation deposited in shallow-water platform facies.Based on field survey,sedimentary facies analysis,and biostratigraphic data,we redefine the ore-bearing strata as the Dongping unit(Td1)which belongs to the Shipao Formation.Early Triassic bivalves(e.g Claraiasp.)and ammonoids were obtained from mudstone layers in the lower part of the ore-bearing strata.A LA-ICP-MS zircon U-Pb age of 251.5±2.5Ma was obtained from pyroclastic rocks in the upper part of the ore-bearing strata.Together with Middle Triassic bivalves and ammonoids from the pyroclastic rocks,the new data suggest that the manganese ore-bearing strata are middle-late Early Triassic in age.
【Key Words】: stratigraphy ore-bearing strata LA-ICP-MS Beisi Formation Shipao Formation Triassic Dongping Manganese Ore Guangxi
【Fund】: 中国地质调查局“扬子陆块及周缘地质矿产调查工程”公益性基础地质调查项目(12120113063500)资助
【CateGory Index】: P536;P618.32
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