古地理学报 ›› 2022, Vol. 24 ›› Issue (2): 375-388. doi: 10.7605/gdlxb.2022.02.026

• 古地理学及矿产资源 • 上一篇    下一篇

甘肃张掖白垩纪早Aptian期黑色页岩揭示的气候岁差驱动及其意义*

谢琴1,2, 陈家胜1,2, 刘晓静1,2, 刘秀铭1,2,3   

  1. 1 福建师范大学地理研究所,福建福州 350007;
    2 福建师范大学湿润亚热带生态—地理过程教育部重点实验室,福建福州 350007;
    3 麦考瑞大学环境与地理系,澳大利亚悉尼 NSW2109
  • 收稿日期:2021-06-12 修回日期:2021-11-16 出版日期:2022-04-01 发布日期:2022-04-02
  • 通讯作者: 陈家胜,男,1985年生,福建师范大学地理科学学院助理研究员,硕士生导师,主要从事环境磁学、土壤与环境等研究。E-mail: chenjsh04@fjnu.edu.cn。
  • 作者简介:谢琴,女,1996年生,福建师范大学硕士研究生,主要从事白垩纪古气候研究。E-mail: xieqincwnu@163.com。
  • 基金资助:
    *福建省公益类科研院所专项项目(编号: 2019R1002-5)、国家自然科学基金项目(编号: 41602190)、福建师范大学创新团队项目(编号: IRTL1705)联合资助

Detection of climatic precession variability of black shale in the early Aptian of Cretaceous in Zhangye of Gansu Province and its significance

Xie Qin1,2, Chen Jia-Sheng1,2, Liu Xiao-Jing1,2, Liu Xiu-Ming1,2,3   

  1. 1 Institute of Geography,Fujian Normal University,Fuzhou 350007,China;
    2 Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University,Fuzhou 350007,China;
    3 Department of Environment and Geography,Macquarie University,Sydney NSW2109,Australia
  • Received:2021-06-12 Revised:2021-11-16 Online:2022-04-01 Published:2022-04-02
  • Contact: Chen Jia-Sheng,born in 1985,is an assistant researcher and master tutor of College of Geography Science,Fujian Normal University. He is currently engaged in environmental magnetism,soil and environment research and so on. E-mail: chenjsh04@fjnu.edu.cn.
  • About author:Xie Qin,born in 1996,is a master degree candidate of the Fujian Normal University. She is currently engaged in Cretaceous paleoclimate research. E-mail: xieqincwnu@163.com.
  • Supported by:
    Special Project of Fujian Public Welfare Research Institute(No.2019R1002-5),the National Natural Science Foundation of China(No.41602190),and the Innovation Research Team Fund of Fujian Normal University(No. IRTL1705)

摘要: 白垩纪中期是温室气候的典型代表,在该时期地球经历了深刻的环境变化。有研究表明白垩纪中期欧洲低纬(约20°~30°N)地区海相地层的黑色页岩呈现斜率信号,同一时期同样纬度的中国地区以陆相沉积为主,但陆相低纬黑色页岩的轨道尺度周期研究较少。因此本研究选择甘肃张掖南台子白垩纪早Aptian期下沟组黑色页岩(古纬度约23°N)作为研究对象,以CaCO3含量作为高分辨率古气候替代性指标,利用平均频谱拟合差和年代标尺优化法分析了南台子早Aptian期下沟组黑色页岩段的轨道周期变化,并利用频谱分析方法对调谐后的时间域序列进行分析。结果显示南台子下沟组黑色页岩段以岁差周期为主导,与欧洲低纬地区相关研究显著不同。这一气候变化的探索不仅提供了中国西北地区白垩纪轨道尺度气候变化的新证据,而且也有助于更全面认识白垩纪中期低纬地区气候变化的驱动机制。

关键词: 岁差, 碳酸钙, 黑色页岩, TimeOpt, ASM

Abstract: The earth experienced profound environmental changes at the mid-Cretaceous when a typical representative of the greenhouse climate occurred. In the mid-Cretaceous,studies have shown that black shale in low-latitude(ca.20°~30°N)marine strata in Europe records presents obliquity signals,continental deposits are prevalent in inland China at the same latitude and during the same period,but there are few studies on the orbital-scale periodicity of continental low-latitude black shales. In this study,CaCO3 content is used as an alternative high-resolution indicator of paleoclimate,and average spectral misfit(ASM)and time scale optimization(TimeOpt)analyses are used to explore the orbital periodicity of the black shale in the Xiagou Formation of the early Aptian of Cretaceous in Nantaizi (palaeoatitude of ca 23°N),Zhangye of Gansu Province, China. The result shows that the climate is dominated by precession and eccentricity cycles,which is significantly different from the result in Europe. The exploration of this climate change not only provides new evidence for the cretaceous orbital-scale climate change in the Northwest China,but also contributes to a more comprehensive understanding of the driving mechanism of climate change in the mid-Cretaceous.

Key words: precession, CaCO3, black shale, TimeOpt, ASM

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