生物多样性 ›› 2022, Vol. 30 ›› Issue (11): 21504.  DOI: 10.17520/biods.2021504

所属专题: 青藏高原生物多样性与生态安全

• 中国南方新生代植物多样性演化专题 •    下一篇

滇东南普阳盆地含煤地层孢粉组合特征及其年代

杨久成1,2, 刘佳2,3,*(), 李雨4, 苏涛2,5, 李树峰2, 贾林波6, 周浙昆2,6, 张世涛1,*()   

  1. 1.昆明理工大学国土资源工程学院, 昆明 650093
    2.中国科学院西双版纳热带植物园热带森林生态学重点实验室, 云南勐腊 666303
    3.现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所), 南京 210008
    4.玉溪师范学院古生物研究中心, 云南玉溪 653100
    5.中国科学院大学, 北京 100049
    6.中国科学院昆明植物研究所, 昆明 650201
  • 收稿日期:2021-12-08 接受日期:2022-03-12 出版日期:2022-11-20 发布日期:2022-08-04
  • 通讯作者: 刘佳,张世涛
  • 作者简介:liujia@xtbg.ac.cn
    E-mail: zhangshitao9918@sina.com;
  • 基金资助:
    国家自然科学基金(42002020);国家自然科学基金(41922010);中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室开放课题(193117);中国科学院西部之光青年学者项目(2020000023);云南省科技厅基础研究专项(202001AU070137)

Palynological assemblage and age of the Cenozoic coal-accumulation strata in the Puyang Basin, southeastern Yunnan Province

Jiucheng Yang1,2, Jia Liu2,3,*(), Yu Li4, Tao Su2,5, Shufeng Li2, Linbo Jia6, Zhekun Zhou2,6, Shitao Zhang1,*()   

  1. 1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093
    2. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303
    3. State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), Nanjing 210008
    4. Research Center of Paleobiology, Yuxi Normal University, Yuxi, Yunnan 653100
    5. University of Chinese Academy of Sciences, Beijing 100049
    6. CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201
  • Received:2021-12-08 Accepted:2022-03-12 Online:2022-11-20 Published:2022-08-04
  • Contact: Jia Liu,Shitao Zhang

摘要:

云南地处青藏高原东南缘, 生物多样性丰富, 季风气候特征明显。新生代剧烈的构造活动形成了众多山间盆地, 其间保存了大量精美的植物化石, 是探讨新生代以来植被、植物多样性和地球环境演变的理想地区。但是长期以来, 由于地层年代学证据的缺乏, 这些新生代沉积盆地的地质年代还存在很大争议。本研究通过对滇东南地区富宁县普阳盆地的含煤地层开展深入的孢粉学研究, 探讨盆地含煤地层年代及其古气候演化过程。剖面下部煤层孢粉组合以杉粉属(Taxodiaceaepollenites)为主, 指示以杉科为主的湿润沼泽森林, 冬春季相对湿润; 剖面上部孢粉组合指示以常绿栎类为主的亚热带常绿‒落叶阔叶混交林, 生长山核桃粉属(Caryapollenites)、冬青粉属(Ilexpollenites)、胡桃粉属(Juglanspollenites)、枫香粉属(Liquidambarpollenites)等亚热带常见树种, 气候温暖湿润, 季节分明。结合新发现的哺乳动物化石证据和周边地区不同地质时代的孢粉组合, 普阳盆地含煤地层的沉积时代应为晚始新世; 同时, 孢粉组合也表明滇东南地区植被现代化面貌至少在晚始新世就已经开始出现。

关键词: 孢粉, 普阳盆地, 云南, 晚始新世, 生物多样性

Abstract

Aims: Located in the southeastern margin of the Tibetan Plateau, Yunnan Province is mainly characterized by a typical tropical monsoon climate and hosts the richest biodiversity in China. Dramatic tectonic activities during the Cenozoic era created many intermountain basins. These sedimentary basins provide excellent opportunities for understanding Cenozoic vegetation evolution, biodiversity and paleoenvironmental change. However, the ages of the basins remain far from fully investigated. Here we use the Puyang Coal mine section, Puyang Basin, southeastern Yunnan, southwestern China, to investigate paleoclimate and the evolution of vegetation, as well as the age of the coal-accumulation strata.

Methods: In this study, 40 palynological samples were collected from different layers in the Puyang Coal mine section, and the pollen and spores were extracted using the conventional acid-base method. The samples were used to reconstruct palynological assemblages and vegetation features by identifying and counting the species, quantity and proportion of pollen in sedimentary strata.

Results:A total of 74 morphological genera of pollen were identified in this study, including 13 gymnosperms, 49 angiosperms, 10 ferns, and 2 algae.

Conclusion: The palynological assemblage of the lower part of the study section is dominated by Taxodiaceaepollenites, indicating a swamp forest with a relatively humid climate in the cold season. The palynological assemblage of the upper section indicates a mixed subtropical evergreen and deciduous broadleaved forest, dominated by evergreen oaks, along with other subtropical taxa, such as Caryapollenites, Ilexpollenites, Juglanspollenites, and Liquidambarpollenites.It represents a warm and humid climate with significant seasonality. By combining newly discovered mammal fossil and palynological evidence, we infer that the age of the coal-accumulation strata in the Puyang Basin is late Eocene. The palynological assemblage also indicates the modernization of the biota in Southeast Yunnan since the late Eocene.

Key words: palynology, Puyang Basin, Yunnan, Eocene, biodiversity