文章摘要
颜永毫,周杰,何忠,周新郢,赵克良,杨林海,隆浩.三万年来卤阳湖湖泊沉积物地球化学元素变化特征及其环境意义[J].水土保持学报,2016,(3):
三万年来卤阳湖湖泊沉积物地球化学元素变化特征及其环境意义
The Characteristics of Geochemical Elements in Luyang Lake Sediments and its Paleoclimatic Environmental Implications for the Last 30,000 Years
投稿时间:2016-01-23  修订日期:2016-03-11
DOI:
中文关键词: 湖泊沉积物  气候变化  地球化学元素  卤阳湖
英文关键词: Lake sediments  Climate change  Geochemical elements  Luyang Lake
基金项目:中国科学院战略先导专项 (XDB03020300), 国家自然基金 (41472156),中国科学院西部之光 (Z111021308) ,西北农林科技大学基础科研项目基金(Z109021430、Z109021537),留学基金委访学学者项目(201504910452)
作者单位邮编
颜永毫 中国科学院水利部水土保持研究所/西北农林科技大学水土保持研究所 712100
周杰 中国科学院水利部水土保持研究所/西北农林科技大学水土保持研究所 712100
何忠 中国科学院水利部水土保持研究所/西北农林科技大学水土保持研究所 
周新郢 中国科学院古脊椎与古人类研究所 
赵克良 中国科学院古脊椎与古人类研究所 
杨林海 中国科学院寒区旱区环境与工程研究所 
隆浩 中国科学院南京地理与湖泊研究所 
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中文摘要:
      利用荧光光谱仪,等离子发射光谱测定了关中盆地卤阳湖区沉积物(0~280 cm)元素含量变化,在光释光定年与R型聚类分析基础上,探讨了三万年来该区26种元素的地球化学行为特征及环境意义。结果表明:卤阳湖沉积物元素大致可分四类:第一类Si、Zr、Hf、Na,指示4.6 ka B.P.后湖泊萎缩,外源沉积减少;第二类Ga、U、Sr指示4.6 ka B.P.和2.0 ka B.P.前后的湖区干旱气候;第三类Cu、Hg、Mn、Mg 指示4.6 ka B.P.后湖水咸度的增加;第四类 Ti 、Sb、Pb 、V、Th、Co、Fe、Bi、Cs、Zn、Ni、Rb、Ga、K、Al这15种元素指示湖水咸度与周边人为活动的增加。元素变化特征说明卤阳湖在33 ka B.P.至10.4 ka B.P.间,沉积环境稳定,全新世前期(10.4~4.6 ka B.P.) 湖水变淡,4.6 ka B.P.后,外源沉积减少,湖水咸度升高,2.0 ka B.P.前后,湖泊干旱造成大量盐分生成,之后,虽气候转湿,但人为活动增加使湖泊快速走向衰亡。
英文摘要:
      The characteristics of 26 geochemical elements and their environmental significance in Luyang Lake sediments (0—280 cm) for last 30,000 years in Guanzhong basin were discussed based on the element contents determinated by fluorescence spectrometer and plasma emission spectrometry, the OSL dating results and the R—type cluster analysis. Results show that: geochemical elements in Luyang Lake sediments can be divided into four categories: the first include Si, Zr, Hf, Na, indicating the decreased exogenetic clastics and the lake shrink after 4.6 ka B.P.; the second include Ga, U, Sr, indicating the arid climate at 4.6 ka B.P. and 2.0 ka B.P.; the third include Cu, Hg, Mn, Mg, indicating the increasing lake salty since 4.6 ka B.P.; the fourth contains 15 elements, including Ti, Sb, Pb, V, Th, Co, Fe, Bi, Cs, Zn, Ni, Rb, Ga, K, Al, indicating the increaseing lake salinity and the human activities around the lake. Different behaviors of geochemical elements in Luyang Lake show that: the sedimentary environment in Luyang Lake was stable between 33 ka B.P. and 10.4 ka B.P., then the lake salinity decreased in the early Holocene (10.4—4.6 ka B.P.) while increased after 4.6 ka B.P. accompaning with the reduced exogenetic clastics, the drying process at 2.0 ka B.P. caused a lot of salt formation, then the climate turned relatively wet, however, the increasing human activities accelerated the lake disappearance.
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