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古地理学报 ›› 2012, Vol. 14 ›› Issue (5): 571-582. doi: 10.7605/gdlxb.2012.05.003

• 岩相古地理学及沉积学 • 上一篇    下一篇

青藏高原东缘盐源盆地古近纪风成沙丘及其古地理意义*

崔晓庄1 江新胜1 伍 皓1，2 熊国庆1 卓皆文1 陆俊泽1   

  1. 1 成都地质矿产研究所，四川成都 610081
    2 中国地质科学院，北京 100037
  • 收稿日期:2012-03-29 修回日期:2012-04-20 出版日期:2012-10-01 发布日期:2012-10-01
  • 作者简介:崔晓庄，男，1984年生，硕士，助理工程师，主要从事沉积学与岩石地球化学研究。E-mail: cdcxiaozhuang@hotmail.com。
    通讯作者简介 江新胜，男，1956年生，博士，研究员，主要研究方向为古地理、古沙漠与全球气候变化。通讯地址：四川省成都市一环路北三段2号成都地质矿产研究所沉积与能源地质研究室；邮编：610081。联系电话：028-83231155；E-mail: cdjxinsheng@126.com。
  • 基金资助:
    国家自然科学基金项目(批准号：40372064)和中国地质调查局青藏基础地质综合研究项目(编号：1212010610101)联合资助

The Paleogene aeolian dunes and their palaeogeographic significance in Yanyuan Basin，eastern margin of the Tibetan Plateau

Cui Xiaozhuang1 Jiang Xinsheng1 Wu Hao1，2 Xiong Guoqing1 Zhuo Jiewen1 Lu Junze1   

  1. 1 Chengdu Institute of Geology and Mineral Resources，Chengdu 610081，Sichuan
    2 Chinese Academy of Geological Sciences，Beijing 100037
  • Received:2012-03-29 Revised:2012-04-20 Online:2012-10-01 Published:2012-10-01
  • About author:Cui Xiaozhuang，born in 1984，is an assistant engineer at Chengdu Institute of Geology and Mineral Resources.He is engaged in sedimentology and petrogeochemistry.E-mail: cdcxiaozhuang@hotmail.com.
    About the corresponding author Jiang Xinsheng，born in 1956，is a research professor at Chengdu Institute of Geology and Mineral Resources.He is engaged in palaeogeography，palaeo-desert and global climate change.Tel：028-83231155；E-mail: cdjxinsheng@126.com.

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摘要： 盐源盆地始新世丽江组沉积时期发育了一套具大型高角度交错层理的红色砂岩，其确切成因对于厘定青藏高原东缘古近纪古地理格局、恢复东亚新生代干旱带与古气候演化过程具有重要意义。文中通过对盐源盆地始新统丽江组红色砂岩的沉积特征进行系统分析，证明该套砂岩的岩性、粒度分布、石英颗粒表面特征与沉积构造等明显不同于水成沉积，而与典型风成沙丘相应特征完全一致，表明其为风成沙丘沉积。结合古近纪研究区的古气候条件、大气环流样式与大地构造背景，笔者进一步推断盐源盆地始新世风成沙丘可能沉积于中国古近纪干旱带内的沙漠环境。根据目前相关研究资料，确认青藏高原东缘存在一个厚度稳定的古近纪风成沙丘富集带。

关键词: 风成沙丘, 沉积特征, 古近纪, 始新世, 古地理, 盐源盆地, 青藏高原东缘

Abstract: Red sandstones with large-scale cross-beddings in high dip angles were developed in Yanyuan Basin during the sedimentary period of Eocene Lijiang Formation.Its exact origin is significant for revising the Paleogene palaeogeographic pattern in the eastern margin of the Tibetan Plateau and reconstructing the evolutionary process of the Cenozoic arid belt and palaeoclimate in East Asia.Sedimentary characteristics of these red sandstones from the Eocene Lijiang Formation in　Yanyuan Basin were systematically analyzed in this paper.The results show that their lithology，grain size distribution，surface features of quartz grains and sedimentary structures are clearly different from aqueous deposits，but perfectly consistent with the corresponding sedimentary characteristics of typical aeolian dunes，indicating that these red sandstones should be attributed to aeolian dunes.Combined with the Paleogene palaeoclimate state，atmospheric circulation pattern and geotectonic setting of the study area，it is further inferred that the Eocene aeolian dunes in Yanyuan Basin could be deposited in the desert environment，which was located in the Chinese Paleogene arid belt.Furthermore，on the basis of existing relevant research data，it is also confirmed that there was an aeolian dune enrichment zone in eastern margin of the Tibetan Plateau during the Early-Mid Paleogene epoch.

Key words: aeolian dunes, sedimentary characteristics, Paleogene, Eocene, palaeogeography, Yanyuan Basin, eastern margin of the Tibetan Plateau

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