| 内蒙古查干淖尔湖2000a以来气候环境演变的沉积记录 |
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| 引用本文： | 江南,王永,董进,杨劲松,田飞,刘瑾,汤文坤.内蒙古查干淖尔湖2000a以来气候环境演变的沉积记录[J].地质通报,2016,35(6):953-962. |
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| 作者姓名： | 江南 王永 董进 杨劲松 田飞 刘瑾 汤文坤 |
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| 作者单位： | 1. 中国地质科学院地质研究所, 北京 100037;2. 中国地质科学院水文地质环境地质研究所, 河北 石家庄 050061 |
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| 基金项目： | 中国地质调查局项目(编号:12120113005600、1212011120142) |
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| 摘 要： | 以内蒙古东部查干淖尔湖西湖深97cm的浅井剖面为对象,根据取得的7个AMS14C测年数据建立其2070cal a BP以来的年代序列,结合孢粉组合特征与粒度组成的综合分析,重建该地区2070cal a BP以来气候环境变化过程。研究结果表明,查干淖尔湖2070cal a BP以来气候环境变化具体可以分为3个阶段:2070~1150cal a BP,孢粉总浓度较高,以蒿属、藜科为主,沉积物各粒级组分变幅较小且以粉砂为主,水动力条件较弱,湖水位较高,气候温凉偏湿;1150~825cal a BP,孢粉总浓度显著降低,耐旱的麻黄属达到最高值,沉积物粗颗粒含量显著增加,水动力条件增强,湖水位降低,气候冷干,其中940~870cal a BP期间气候极端干旱;825cal a BP以来,总体温暖偏湿,有冷干事件发生。太阳活动可能是导致查干淖尔湖过去2000a气候变化的主要驱动力。
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Sedimentary record of environmental evolution since ca 2000 cal yr B P ago in Qehan Lake, Inner Mongolia |
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| JIANG Nan,WANG Yong,DONG Jin,YANG Jinsong,TIAN Fei,LIU Jin and TANG Wenkun.Sedimentary record of environmental evolution since ca 2000 cal yr B P ago in Qehan Lake, Inner Mongolia[J].Geologcal Bulletin OF China,2016,35(6):953-962. |
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| Authors: | JIANG Nan WANG Yong DONG Jin YANG Jinsong TIAN Fei LIU Jin and TANG Wenkun |
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| Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, Hebei, China |
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| Abstract: | A 97cm long lacustrine section from Qehan Lake, situated in eastern Inner Mongolia, was used to reestablish the environ-ment and climate changes since the last 2070cal a BP. The chronological framework was built on seven AMS14C ages. On the basis of pollen-spore characteristics and grain size distribution, three environmental stages can be recognized. From 2070~1150cal a BP, this interval was featured by high total pollen concentration, with the dominance of Artemisia and Chenopodiaceae; lacustrine sediments were mainly composed of silt and each fraction presented quite low amplitudes of increases, indicating the weak hydrological condi-tions and high lake level; this period was characterized by a warm, cool and slightly humid climate. During the period of 1150~825cal a BP, the total pollen concentration significantly decreased and the pollen percentages of xerophyte, especially Ephedra, reached the maximum; the coarse particle content showed obviously increase, sugge sting strong hydrodynamic conditions and low lake level; so in this period, the climate was cold and dry,especially from 940cal a BP to 870cal a BP. Since 825cal a BP, the climate mainly tend-ed to become warm and slightly humid with the occurrence of cold and dry oscillations. Solar activities might have been the domi-nant force that drove the climate changes in Qehan Lake area since 2000 years ago. |
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| Keywords: | 2000a pollen grain size climate change Qehan Lake Inner Mongolia |
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