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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第34卷

期数:

2012年第03期

页码:

62-69

栏目:

水资源与环境

出版日期:

2012-09-20

文章信息/Info

Title:

Sedimentary Record of Environmental Evolution Since Late Stage of Late Pleistocene in Bilutu of Central Inner Mongolia

作者:

王永¹; 周赤华²; 姚培毅¹; 迟振卿¹

1.中国地质科学院 地质研究所,北京 100037; 2.内蒙古赤峰地质矿产勘查开发院,内蒙古 赤峰 024005

Author(s):

WANG Yong¹;  ZHOU Chi-hua²;  YAO Pei-yi¹;  CHI Zhen-qing¹

1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. Inner Mongolia Chifeng Institute of Geology and Mineral Exploration and Development, Chifeng 024005, Inner Mongolia, China

关键词:

古气候;  环境变迁;  晚更新世;  地球化学;  末次冰期;  湖泊;  必鲁图;  内蒙古

Keywords:

paleoclimate;  environmental change;  Late Pleistocene;  geochemistry;  last glaciation;  lake;  Bilutu;  Inner Mongolia

分类号:

P532; P534.63

DOI:

-

文献标志码:

-

摘要:

以内蒙古中部必鲁图厚度250 cm的浅井湖泊剖面为研究对象,根据取得的6个光释光法测年数据,建立晚更新世晚期56.8 ka以来的年代序列,对湖泊沉积特征、粒度组成、Rb与Sr含量(质量分数)之比、氧化物含量及其比值等地球化学特征进行分析,并通过综合研究各指标的气候环境指示意义,重建该地区晚更新世晚期以来的气候环境演变过程。结果表明:该地区晚更新世晚期以来气候环境变化可以分为5个阶段。第1阶段,56.8～49.5 ka,沉积物有机质较丰富,化学风化作用较强,以温干偏湿气候为主; 第2阶段,49.5～41.3 ka,化学风化较弱,水热条件较差,气候冷干偏湿; 第3阶段,41.3～20.8 ka,气候转为暖湿,化学风化作用最强,为升温高降水期,末次冰期间冰段,间有小的冷湿、温干波动; 第4阶段,20.8～8.2 ka,各项地球化学指标均发生突变,砂楔发育,气候恶化,持续干冷,期间存在末次冰期最盛期; 第5阶段,8.2～0 ka,气候以温干为主,晚期气候向凉干转变趋势明显。

Abstract:

A lake shallow well section with the depth of 250 cm in Bilutu of central Inner Mongolia was studied. According to the six dating data of optically stimulated luminescence, the chronology for the lake sediment since the late stage of Late Pleistocene(56.8 ka)was established, and geochemical features including sedimentary characteristic, ratio of the contents(mass fractions)of Rb and Sr, content of oxide and the ratio of them were used to reconstruct the paleoenvironmental and climatic changes since the late stage of Late Pleistocene in Bilutu. The results showed that the climatic and environmental changes since the late stage of Late Pleistocene in Bilutu were divided into five stages. The first stage was from 56.8 ka to 49.5 ka, the organic matter in sedimentary deposit was rich, the chemical weathering was strong, the climate was mainly warm-dry-slightly damp; the second stage was from 49.5 ka to 41.3 ka, chemical weathering was weak, hydrothermal condition was poor, the climate was cold-dry-slightly damp; the third stage was from 41.3 ka to 20.8 ka, the climate became warm, the chemical weathering was strongest, the temperature raise and precipitation was high, the stage was interstade of last glaciation with little fluctuation of cold-wet and warm-dry; the fourth stage was from 20.8 ka to 8.2 ka, all the geochemical indicators changed significantly, sand wedge developed, climate deteriorated, the stage was continually dry-cold, and there was Last Glacial Maximum(LGM); the fifth stage was from 8.2 ka to now, the climate was mainly warm-dry, the climate became to cold-dry in the late of the stage significantly.

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备注/Memo

备注/Memo:

收稿日期:2012-03-15
基金项目:中国地质调查局地质大调查项目(1212010611703,1212011087116)
作者简介:王 永(1968-),男,内蒙古四子王人,研究员,理学博士,E-mail:wangyong@cags.ac.cn。

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更新日期/Last Update: 2012-09-20