地理学报 ›› 2004, Vol. 59 ›› Issue (4): 514-524.doi: 10.11821/xb200404004

• 环境变迁 • 上一篇    下一篇

藏南沉错湖泊沉积多指标揭示的2万年以来环境变化

朱立平1,2, 王君波1,3, 陈玲4, 杨京蓉, 李炳元1, 朱照宇1, HiroykiKitagawa5, G?ranPossnert6   

  1. 1. 中国科学院地理科学与资源研究所,北京 100101;
    2. 中国科学院青藏高原研究所,北京 100085;
    3. 中国科学院研究生院,北京 100039;
    4. 中国科普研究所,北京 100081;
    5. 中国科学院广州地球化学研究所,广州 510640;
    6. 日本名古屋大学年代综合研究实验室;
    7. 瑞典乌普萨拉大学材料科学系
  • 收稿日期:2003-11-19 修回日期:2004-03-15 出版日期:2004-07-25 发布日期:2004-07-25
  • 作者简介:朱立平 (1965-), 男, 研究员, 博士生导师, 主要从事环境变化与岩石风化研究。E-mail: zhulp@igsnrr.ac.cn
  • 基金资助:

    国家自然科学基金重点项目 (40331006);中科院知识创新工程项目 (KZCX3-SW-339) 资助

20,000-year Environmental Change Reflected by Multidisciplinary Lake Sediments in Chen Co, Southern Tibet

ZHU Liping1,2, WANG Junbo1,3, CHEN Ling4, YANG Jingrong, LI Bingyuan1, ZHU Zhaoyu1, HIROYKI Kitagawa5, G?RAN Possnert6   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Institute of Tibetan Plateau Research, CAS, Beijing 100085, China;
    3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;
    4. Chinese Research Institute of Science Popularization 100081, China;
    5. Guangzhou Institute of GeoChemistry, CAS, Guangzhou 510640, China;
    6. Integrated Laboratory of Chronology, Nagoya University, Japan;
    7. Department of Material Sciences, Uppsala University, Sweden
  • Received:2003-11-19 Revised:2004-03-15 Online:2004-07-25 Published:2004-07-25
  • Supported by:

    Key Project of National Natural Science Foundation of China, No.40331006; Knowledge Innovation Project of CAS, No.KZCX3-SW-339

摘要:

通过对藏南沉错湖芯TC1孔的研究,分析了TC1孔的粒度、ToC、TN、C/N、Fe/Mn、Sr/Ba以及环境磁学参数等环境代用指标,基本上获得了这一地区2万年以来的环境变化记录。结果显示约19 800~18 000 Cal aBP的温度下降在各指标中具有明显的反映;约16 000 Cal aBP左右,温度在一次跃动上升之后,随即出现急剧下降;约15 200~12 000 Cal aBP,是降温之后的缓慢回升过程;约12 000~9 500 Cal aBP,各种指标均显示湖区环境处于不适宜阶段,特别是11 600~10 400 Cal aBP,湖区环境显著恶化。进入全新世后,湖区环境经历了3次明显的暖期 (约9 500~7 600 Cal aBP、约6 800~5 800 Cal aBP、约4 800~3 800 Cal aBP) 和2次冷期 (约7 600~6 800 Cal aBP、约5 800~4 800 Cal aBP),呈现出暖干/冷湿的交替规律,具有南亚季风 (西南季风) 区气候变化的特征。沉错湖区2万年来的气候环境变化序列中的某些特征时段与格陵兰冰芯记录和青藏高原其他记录相比具有较好的一致性,反映了湖区及藏南地区的气候环境演变特征具有全球性特征。

关键词: 湖泊沉积, 环境演变, 2万年, 藏南湖泊, 青藏高原

Abstract:

A 20,000-years environmental record is elucidated by analyzing the environmental proxies such as grain size, ToC, TN, C/N, Fe/Mn, Sr/Ba and environmental magnetism parameters from a lake core (TC1) in Southern Tibet area. Results showed that during the period of ca. 19800-18000 Cal aBP, the decreasing temperature was reflected by all analyzed proxies. Temperature appeared a jump rise around ca. 16000 Cal aBP and then had an abrupt decrease. About 15200-12000 Cal aBP, temperature slowly re-rose. However, almost all the proxies indicated that the environment was unsuitable for lives existing during ca. 12000-9500 Cal aBP. Especially during ca. 11600-10400 Cal aBP, the environment became deteriorated. From the beginning of HoloCene, the environment experienced 3 obvious warm stages (ca. 9500-7600 Cal aBP, ca. 6800-5800 Cal aBP, ca. 4800-3800 Cal aBP) and 2 cold stages (ca.7600-6800 Cal aBP, ca. 5800-4800 Cal aBP), representing obvious alternation of warm-dry and cold-wet, having the climatic change characteristics of South Asian monsoon (southwest monsoon) zone. Some characters of the 20,000-year climatic and environmental change sequence in Chen Co area had rather good coherence with Greenland ice core records (GISP2) and other environmental records on the Tibetan Plateau, reflecting that the environmental changes in this area had certain global significance.

Key words: lake sediments, environmental changes, Chen Co, Southern Tibet, Tibetan Plateau