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西藏札达盆地上新世—早更新世气候变迁与湖泊演化

韩建恩 余佳 朱大岗 孟宪刚 邵兆刚 杨朝斌

韩建恩, 余佳, 朱大岗, 等, 2011. 西藏札达盆地上新世—早更新世气候变迁与湖泊演化. 地质力学学报, 17 (4): 361-372.
引用本文: 韩建恩, 余佳, 朱大岗, 等, 2011. 西藏札达盆地上新世—早更新世气候变迁与湖泊演化. 地质力学学报, 17 (4): 361-372.
HAN Jian-en, YU Jia, ZHU Da-gang, et al., 2011. CHANGE OF THE PALEOCLIMATE AND EVOLUTION OF THE LAKE DURING PLIOCENE-EARLY PLEISTOCENE IN ZANDA BASIN, TIBET. Journal of Geomechanics, 17 (4): 361-372.
Citation: HAN Jian-en, YU Jia, ZHU Da-gang, et al., 2011. CHANGE OF THE PALEOCLIMATE AND EVOLUTION OF THE LAKE DURING PLIOCENE-EARLY PLEISTOCENE IN ZANDA BASIN, TIBET. Journal of Geomechanics, 17 (4): 361-372.

西藏札达盆地上新世—早更新世气候变迁与湖泊演化

基金项目: 

中国地质调查局项目“青藏高原第三纪重点古湖泊环境演变序列” 任务书编号:科[2005]005—02

中国地质调查局项目“青藏高原第三纪重点古湖泊环境演变序列” 工作项目编码:1212010511902

国家自然科学基金项目 40572134

详细信息
    作者简介:

    韩建恩(1980-),男,陕西宝鸡人,助研,博士,从事构造地质学、沉积相与古环境研究。E-mail:hanjianen@163.com

  • 中图分类号: P534.63

CHANGE OF THE PALEOCLIMATE AND EVOLUTION OF THE LAKE DURING PLIOCENE-EARLY PLEISTOCENE IN ZANDA BASIN, TIBET

  • 摘要: 通过孢粉组合分析, 结合河湖相地层岩性特征和古地磁及电子自旋共振(ESR)法年龄测定结果, 探讨了西藏札达盆地上新世—早更新世的古气候变迁与札达古湖泊演化的关系.研究表明, 札达盆地古湖泊演化可划分为早(湖泊形成期)、中(稳定发展期)、晚(湖泊消亡期)三期.早期(距今5.41~4.40 Ma), 札达盆地为温凉而干旱的疏林草原植被气候, 随后转变为温暖稍湿的森林草原植被气候, 最后转变为温暖潮湿的亚热带针阔叶混交林气候, 这一时期古湖开始形成; 中期(距今4.40~2.57 Ma), 古气候进入寒温期, 古植被表现为先由暖温带针阔叶混交林带向山地寒温带暗针叶林带过渡, 再由山地暖温带针阔叶混交林→山地寒温带暗针叶林交替出现的过程, 古湖泊进入发育期; 晚期(距今2.57~1.36 Ma), 湖区古气候环境进入寒冷期, 古植被为山地寒温带暗针叶林→山地暗针叶林向低矮灌木→干冷草原的变化, 古湖泊进入消亡阶段.古湖泊演化与古植被、古气候演变有很好的相关性, 高原隆升控制了古气候环境的变化, 进而影响湖泊水量的变化.

     

  • 图  1  札达盆地区域地质构造简图[24]

    1—全新统; 2—下更新统香孜组; 3—更新统冰水冰碛堆积; 4—上新统; 5—中生界; 6—古生界; 7—构造混杂岩类; 8—断层; 9—正断层; 10—逆断层; 11—不整合界线; 12—剖面位置

    Figure  1.  A map showing the regional tectonics of the Zanda Basin

    图  2  札达盆地上新世—早更新常见孢粉类型的百分含量变化图式

    (据文献[30]数据修改,采样位置见图 1)

    Figure  2.  A map showing percentage changes of the common sporopollen types in Zhanda Basin form Pliocene to Eopleistocene

    图  3  札达古湖泊各期分布图

    1—古格湖期; 2—香孜冰湖期; 3—湖中岛屿

    Figure  3.  Distribution map of Zanda paleo-lake during different period

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    SHAO Zhao-gang, MENG Xian-gang, ZHU Da-gang, et al.Formation mechanism of seesaw type in Zanda Basin, Ngari, Xizang (Tibet) [J].Geological Review, 2006, 52 (2): 215~218. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dzlp200602010&dbname=CJFD&dbcode=CJFQ
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  • 收稿日期:  2011-06-19
  • 刊出日期:  2011-12-01

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