Characteristics and origin of the earth from artificial mound of prehistoric Daxie salt-making site, Zhejiang Province
Li Wen-Jing1, 2, Lei Shao3, Wang Zhang-Hua1, 2, Li Yue1, Yue Wei4, Zheng Tong-Tong1
1 State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062; 2 Institute of Urban Development, East China Normal University,Shanghai 200062; 3 The Institute of Archaeology,Ningbo 315012,Zhejiang; 4 State Key Laboratory for Marine Geology,Tongji University,Shanghai 200092
Abstract：Daxie site is the earliest prehistoric sea salt-making site discovered in China to date,and is located on the Daxie Island,Ningbo,Zhejiang Province. Artificial mounds constitute the major site. In this study,samples of muddy and sandy artificial earth from the Neolithic mound and samples of hard white material from the garbage and surface of salt-making stove during the archaeological excavation were collected. Samples representing the natural deposits on the island were also collected. Analysis including grain size,inorganic geochemistry and heavy mineral on these samples to explore the origin of the artificial earth and the influence of the salt-making activities were conducted. Results demonstrate that among the seven muddy earth samples collected from excavation units close to the salt-making stoves,five were of terrestrial origin,but also influenced by seawater. Origin of the other two samples were inferred to be the salty mud collected from tidal flat. The sample of white hard material from the garbage has similar elemental chemistry to the salty mud. The sample from the surface of salt-making stove is characterized by high content of Ca,Sr and Ba which is inferred to be the precipitation during boiling. Grain size and heavy mineral analyses of the sandy earth showed an alluvial origin with characteristics of strong chemical weathering,which imply that the original strata were beyond the Holocene. We imply that above results reflected prehistoric people's adaption and utilization of an island and its mud flat,which was using the supratidal, foothill deposits and alluvial sediments for constructing the artificial mound on the tidal flat , and making salt using the technique including leaching the salty mud and boiling the salt-enriched liquid.
Li Wen-Jing,Lei Shao,Wang Zhang-Hua et al. Characteristics and origin of the earth from artificial mound of prehistoric Daxie salt-making site, Zhejiang Province[J]. JOPC, 2018, 20(6): 1102-1112.
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