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地理学,阿勒泰泥炭重金属元素异常记录的人类活动信息

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摘要: 本文选择了众彩彩票真的假的北疆铁尔沙汗湿地雨养泥炭作为研究对象,采用AMS 14C测年并建立了泥炭岩芯的年代序列。测试了泥炭沉积的粒度组成、灰分沉积通量以及重金属元素含量。利用与人类采矿和冶金密切相关的元素Cu、Pb、Cd的变化,初步认识了阿勒泰地区的人类活动对泥炭沉积中元素含量的影响。结果表明,5500 cal a BP以来,泥炭沉积中元素Cu、Pb、Cd的变化叠加了人类活动的影响;5500-2000 cal a BP期间,元素Cu、Pb、Cd富集可能表明了在青铜-铁器文化繁盛的阶段,人们的采矿冶金活动使得周围大气介质中的重金属元素含量升高,从而通过大气沉降进入泥炭沉积中的重金属元素含量亦有所增大;1500 cal a BP以来,两次元素Cu、Pb、Cd极度富集可能分别与唐王朝对西域大规模的开发以及喀喇汗王国采矿冶金活动有关。泥炭沉积表层元素Cu、Pb、Cd含量开始快速上升可能与新疆地区近现代以来大规模的经济开发有关。
关键词: 北疆地区;泥炭沉积;重金属;采矿冶金;?????
WANG Ganggang, QIANG Mingrui*
(? MOE Key Laboratory of Western China’s Environmental Systems, Lanzhou University,Lanzhou 730000; ?)
Abstract: We selected the ombrotrophic peat deposition in the Tieershahan wetland and used the AMS 14C dating to establish the chronology of the peat deposition. Heavy metal elements, ash flux and grian size were measured. Cu, Pb and Cd which are closely related to the mining and metallurgy were employed to reflect the human activity in the Altay Prefecture, Minusinskaya Kotlovina, Tuva. The results show that the significant enrichment of Cu, Pb and Cd during 5500-2000 cal a BP would be associated with a number of prosperous Brozne-Iron civilization around the Altay Prefecture, Minusinskaya Kotlovina and Tuva. The mining and metallurgical activities during this period could enhance the release of the mineral dust, leading to more heavy metal elements transported into the peat deposit. The abrupt enrichment of Cu, Pb and Cd during 1600-1200 and 1100-700 cal a BP probably related to the large-scale development of the Western Regions in Tang dynasty and mining and metallurgical activities of Karahan Kingdom, respectively. The rapid increase of Cu、Pb、Cd contents in the surface of peat deposition were resulted to the modern large-scale economic development in North of Xinjiang area. Keyword: Northern Xinjiang, Peat deposition, Heavy metal, Mining and metallurgy?????
Keywords: Northern Xinjiang, Peat deposition, Heavy metal, Mining and metallurgy?????

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