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冰川冻土 ›› 2016, Vol. 38 ›› Issue (6): 1544-1552.doi: 10.7522/j.issn.1000-0240.2016.0180

• 冰冻圈与全球变化 • 上一篇    下一篇

玉龙雪山冰川沉积序列OSL定年

何则1,2, 何元庆1,3,5, 张志刚3,1, 和丽华4, 齐翠姗5,1, 刘婧1,2   

  1. 1. 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049;
    3. 南京师范大学 地理科学学院, 江苏 南京 210023;
    4. 玉龙雪山省级旅游开发区管理委员会, 云南 丽江 674100;
    5. 兰州大学 资源环境学院, 甘肃 兰州 730000
  • 收稿日期:2016-07-16 修回日期:2016-11-10 出版日期:2016-12-25 发布日期:2017-04-06
  • 通讯作者: 何元庆,E-mail:yqhe@lzb.ac.cn;张志刚,E-mail:zhangzhigang840620@126.com E-mail:yqhe@lzb.ac.cn;zhangzhigang840620@126.com
  • 作者简介:何则(1992-),男,陕西宝鸡人,2014年在西北大学获学士学位,现为中国科学院西北生态环境资源研究院在读硕士研究生,主要从事冰川地貌与地质公园规划研究.E-mail:heze@lzb.ac.cn
  • 基金资助:

    国家重大科学计划研究项目(2013CBA01801);中科院重点部署项目(KJZD-EW-G03-04);国家自然科学基金项目(41503054;41273010);丽江玉龙雪山省级旅游开发区管理委员会委托项目;冰冻圈科学国家重点实验室自主课题(SKLCS-ZZ-2016);中国博士后科学基金面上项目(2015M582728)资助

OSL dating of the Quaternary glacial sedimentary sequences at Mt. Yulong, China

HE Ze1,2, HE Yuanqing1,3,5, ZHANG Zhigang3,1, HE Lihua4, QI Cuishan5,1, LIU Jing1,2   

  1. 1. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. School of Geographical Sciences, Nanjing Normal University, Nanjing 210023, China;
    4. Committee of Provincial Tourism Development and Management in Yulong Snow Mountain, Lijiang 674100, China;
    5. College of Earth Environmental Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2016-07-16 Revised:2016-11-10 Online:2016-12-25 Published:2017-04-06

摘要:

位于青藏高原东南缘的玉龙雪山分布有欧亚大陆纬度最低的海洋型冰川,其主峰及周边地区保存了大量清晰完整的第四纪冰川遗迹。研究该区第四纪冰川作用遗迹及其冰川作用史,具有重要的理论与实际价值。应用光释光(OSL)测年技术对玉龙雪山冰川沉积物进行了定年,结合前人研究资料,重建玉龙雪山冰川作用史。研究结果表明:玉龙雪山东麓的末次冰期冰碛物主要形成于晚更新世末次冰期最盛时期,其平均年代约在25ka,西麓末次冰期冰碛物形成年代约为50ka,对应于深海氧同位素3阶段中期(MIS3b)。而倒数第二次冰期的年代在240ka左右,处于中更新世晚期,对应于MIS8阶段,当时玉龙雪山存在多条复式山谷冰川。该研究可为玉龙雪山第四纪冰川作用历史的重新认识以及光释光测年技术在该区的应用提供基础资料。

关键词: 冰川地貌, OSL, 末次冰盛期, 倒数第二次冰期, 玉龙雪山

Abstract:

The Mt. Yulong is situated in the southeast of the Tibetan Plateau, where the well preserved glacial remnants (including the lowest latitude moraines in the northern hemisphere) provide a natural laboratory to study the Quaternary glacial and the past global climate evolution process. Getting more details about these glacial remnants is important for deeply understanding the regional change of paleo-climate and paleo-environment, as well as the development and utilization of the glacial tills. However, because of shortage of dating records and controversy of climate background, there are no consensus about how many times of glacier advance during the Quaternary. In this paper, OSL dating techniques was used on the glacial sediments at Mt. Yulong. OSL dating data and evidences from geomorphology and stratigraphy reveal that glaciers had advanced during local last glacial maximum (~25 ka) at east side and mid-MIS 3b (~50 ka) at west side of the Mt. Yulong. The Penultimate Glaciation had appeared at ~240 ka in late Middle Pleistocene, corresponding to MIS 8. At that time, there were multiple composite valley glaciers at Mt. Yulong.

Key words: glacial geomorphology, OSL, Last Glacial Maximum, Penultimate Glaciation, Mt. Yulong

中图分类号: 

  • P343.6