| 红原泥炭6000a以来元素异常及其可能反映甘青地区人类活动信息的初步研究 |
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| 引用本文： | 于学峰,周卫健.红原泥炭6000a以来元素异常及其可能反映甘青地区人类活动信息的初步研究[J].第四纪研究,2006,26(4):597-603. |
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| 作者姓名： | 于学峰 周卫健 |
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| 作者单位： | 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安,710075 |
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| 基金项目： | 国家自然科学基金;科技部科研项目;国家重点实验室基金 |
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| 摘 要： | 通过对红原泥炭沉积剖面Pb,Zn,Fe,Mn,Cu,Co,Ni,Ti,V,Al等10种元素和灰分的测试,发现多数元素在该剖面的变化与灰分变化较为一致,但Cu,Pb和Zn元素的变化在剖面300cm以上出现较大异常:这3种元素的变化与其他元素变化呈相反的规律,而且Pb和Zn两种元素的含量较之剖面下部出现数量级的增大。通过对比,发现元素含量的异常与位于剖面上风区的甘青地区新石器时代晚期-青铜时代文化在发生时间上较为吻合,认为这可能是人类活动环境效应的记录。用600~300cm段的元素变化作为背景值,用与Pb,Zn元素相关较好的4种元素分别计算出二者变化的自然背景值,从而分离出了人类活动强度信息与自然环境背景值,分离结果与著名的青海柳湾墓地出土人口规模对比较好。
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| 关 键 词： | 泥炭 元素异常 青铜时代文化 人地关系 |
| 文章编号： | 1001-7410（2006）04-597-07 |
| 收稿时间： | 2006-02-06 |
| 修稿时间： | 2006-04-17 |
PRELIMINARY STUDY OF ELEMENT ABNORMITY RECORDED IN HONGYUAN PEATLAND SINCE 6000aB. P. AND THE POSSIBLE INFORMATION OF ANCIENT HUMAN ACTIVITY |
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| Yu Xuefeng,Zhou Weijian.PRELIMINARY STUDY OF ELEMENT ABNORMITY RECORDED IN HONGYUAN PEATLAND SINCE 6000aB. P. AND THE POSSIBLE INFORMATION OF ANCIENT HUMAN ACTIVITY[J].Quaternary Sciences,2006,26(4):597-603. |
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| Authors: | Yu Xuefeng Zhou Weijian |
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| Institution: | State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy Sciences, Xi'an 710075 |
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| Abstract: | We report the preliminary comparison of the element abnormity (Cu, Pb, Zn) in the peat profile from Eastern Tibetan Plateau with the ancient culture sequence from Gansu-Qinghai in the upper drifting area of the sample site.Peat cores were drilled every 50cm by specific peat sampler from the Hongyuan peatland in Eastern Tibetan Plateau. The sample site is located in the high terrace of Baihe River, 2km southwest away from Hongyuan County(32°46'42″N, 102°31'0″E), where the sediments were rarely influenced by the fluvial sediments. The element concentration (Pb, Zn, Fe, Mn, Cu, Co, Ni, Ti, V, Al) and ash content proxy are measured at every 8cm and 1cm respectively in peat cores. Variations of all the ten elements are consistent well with each other from 600cm to 300cm; while from 300cm to 1cm variations of most elements are still consistent with that of the ash content, except Cu, Pb, and Zn which changed abnormally. Variations of these three elements are counter to those of the other elements from 300cm to 1cm; and the amplitudes of Pb and Zn concentration in this stage are much larger than those from 600cm to 300cm by about one order of magnitude. The age of the element abnormity started from about 5500aB.P. when the Neolithic and Bronze Age Cultures are well developed in Qinghai-Gansu area at where the upper drifting area of the sample site is located. To decipher the reason of the element abnormity we have compared the element abnormity with the sequence of ancient cultures from the late Neolithic to Bronze Age in the area of Qinghai Province and Gansu Province and found out that these two phenomena are closely correlated to each other, which may indicate that the peat sediment in Hongyuan preserved the information of ancient human activity. Since the variations of the ten elements are consistent well with each other from 600cm to 300cm, it is supposed that the elements of this stage are of the natural background value that is not influenced by human activity. Four elements (Ti, V, Co, Ni) correlated the best with the Pb and Zn are selected for reconstructing the average value of the natural variation of Pb and Zn from 300cm to 1cm, the Pb and Zn signals influenced by human activities are then calculated by subtracting the reconstructed value from the measured sequences. The peak value of the reconstructed human activity at about 5000aB.P. , 4500aB.P. , and 4000aB.P. can be well compared respectively with population excavated from the Banshan Type Culture, the Machang Type Culture, and the Qijia Culture in the famous Liuwan Tombs in Qinghai Province.If the element abnormity of the study site can be further proved to be correlated with ancient human activities, it can be applied to understand the human-nature relationship during the ancient time. Much work such as the geochemistry characters of the bedrock and higher resolution elemental analysis should be taken in the future. |
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| Keywords: | peat element abnormity cultural sequences of Neolithic-Bronze Age human-nature relationship |
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