地理学报 ›› 2013, Vol. 68 ›› Issue (3): 343-356.doi: 10.11821/xb201303005

• 地貌 • 上一篇    下一篇

基于释光测年的福建晋江海岸沙丘粒度记录的风沙活动

胡凡根1,3,4, 李志忠1,2,3,4, 靳建辉1,2,3, 赵倩1,3, 张辉1,3, 王贤立1,3, 夏菁1,3, 陈秀玲1,2,3   

  1. 1. 福建师范大学地理科学学院, 福州 350007;
    2. 福建师范大学地理研究所, 福州 350007;
    3. 湿润亚热带生态地理过程省部共建教育部重点实验室, 福州 350007;
    4. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室, 西安 710075
  • 收稿日期:2012-12-15 修回日期:2013-01-12 出版日期:2013-03-20 发布日期:2013-05-10
  • 通讯作者: 李志忠(1962-), 男, 四川绵阳人, 教授, 博士生导师, 主要从事风沙地貌与环境演变研究.E-mail: lizzfz@163.com E-mail:lizzfz@163.com
  • 作者简介:胡凡根(1987-), 男, 江西吉安人,硕士研究生, 主要从事地貌与第四纪环境演变研究.E-mail: hfg1112@163.com
  • 基金资助:

    国家自然科学基金项目(41271031); 中国科学院黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG1113);福建省教育厅科技项目(JA11061)

Coastal environment evolution record from Anshan coastal aeolian sand of Jinjiang, Fujian Province, based on the OSL dating

HU Fangen1,3,4, LI Zhizhong1,2,3,4, JIN Jianhui1,2,3, ZHAO Qian1,3, ZHANG Hui1,3, WANG Xianli1,3, XIA Jing1,3, CHEN Xiuling1,2,3   

  1. 1. College of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
    2. Institute of Geography, Fujian Normal University, Fuzhou 350007, China;
    3. Key Laboratory of Humid Sub-tropical Eco-geographical Process, the Ministry of Education, Fuzhou 350007, China;
    4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an 710075, China
  • Received:2012-12-15 Revised:2013-01-12 Online:2013-03-20 Published:2013-05-10
  • Supported by:

    National Natural Science Foundation of China, No.41271031; The Open Foundation of State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, No.SKLLQG1113;Science and Technology Foundation of Fujian Education Department, No.JA11061

摘要: 采用OSL测年技术对福建晋江海岸沙丘剖面(SHA) 进行加密采样测年和粒度分析,初步确定了研究区近1000a 以来海岸沙丘发育的主要时段,以OSL测年值为基础,在统一时间标尺上综合对比东亚季风变化序列和福建沿海地区台风登陆记录,探讨了控制研究区海岸沙丘发育的主要因素.研究表明:(1) SHA沙丘表现为典型的海岸风成砂特征,海岸沙丘沉积后受风力侵蚀和后期化学风化作用的影响,粒径变粗,分选性变差,各粒级组分和粒度参数特征发生较大变化;(2) 近1000a 以来晋江海岸带海岸沙丘发育可划分为3 个时期,分别为AD1050~1300、AD1470~1600、AD1720~1950,尤其是小冰期(LIA),海岸风沙活动强烈,海岸沙丘发育盛行;(3) 近千年来区域降水量、海平面和台风强度变化与研究区海岸沙丘发育之间的关系尚不明确,而冬季风强度对海岸沙丘发育的影响明显,即海岸风沙活动期主要对应冬季风较强时期,但近50 年来海岸风沙活动较弱除了主要受冬季风减弱影响外,主要与人类经济活动所造成的地表覆被条件发生变化有关.

关键词: 海岸沙丘, 光释光测年, 粒度特征, 风沙活动, 福建晋江

Abstract: Grain size characteristics of the coastal aeolian sand and their chronology potential could greatly improve the interpretation of past environmental changes and provide valuable information on the past aeolian activities. However, lacking of direct dating methods, domestic scholars mainly focus on the distribution, grain size characteristics and geomophogensis to the coastal aeolian sand research. In this paper, quartz single aliquot regenerative optically-stimulated luminescence (OSL) dating with high resolution sampling was firstly applied to coastal aeolian sand in China for the Anshan (SHA) section (24°36′32.7″ N, 118° 39′ 20.3″ E) near the Anshan archaeological site along the Jinjiang coast, southeast Fujian. Through grain-size analysis, we assume that the SHA section demonstrates typical coastal aeolian sand characteristics, and affected by the blowout and chemical weathering after coastal sand deposited, the grain size parameter and content of different sizes of fraction have a large change, the grain size become coarser, the sorting for worse. The OSL ages of the 11 samples range from 839±132a to 108±21a show that SHA section formed in nearly 1000 years, and three periods of coastal aeolian sand activity can be divided, AD1050-1300, AD1470-1600 and AD1720-1950 respectively. Especially during the little ice age (LIA), coastal aeolian sand activity is strong, the development of coastal dunes sand is prevailing, and the OSL age shows that the coastal aeolian sand deposition represents a multiphase and episodic feature. We discuss the main controls of coastal aeolian sand development in the research area based on the OSL chronology. Compared with East Asian monsoon change sequence and the history of typhoon landfalls in Fujian, the result shows that the main control is the intensity of East Asian winter monsoon, but not the precipitation, typhoon landfalls and sea level change. The phase of aeolian activity mainly corresponds to the stronger East Asian winter monsoon period, but over the last half-century, the weakened aeolian activity may be due to human activities on a large amount of mining sand beside a weakened winter monsoon.

Key words: OSL dating, coastal aeolian sand, aeolian activity, Jinjiang of Fujian Province