基于磁组构特征的江汉平原全新世古洪水事件

张玉芬; 李长安; 陈亮; 王辉

基于磁组构特征的江汉平原全新世古洪水事件

张玉芬^1,,
李长安^{2, 3},
陈亮^{1, 4},
王辉¹

1.
中国地质大学地球物理与空间信息学院，湖北武汉 430074
2.
中国地质大学生物地质与环境地质教育部重点实验室，湖北武汉 430074
3.
中国地质大学地球科学学院，湖北武汉 430074
4.
国家海洋局南海工程勘察中心，广东广州 510300

基金项目:

国家自然科学基金项目 40472151

国家自然科学基金项目 40672206

国家自然科学基金项目 40771213

国家重点基础研究发展计划(“973”计划) 2004CB720204

详细信息

作者简介:
张玉芬(1957-), 女, 教授, 博士, 主要从事环境地球物理等方面的教学与研究.E-mail: zhyfcug@163.com

中图分类号: P584;X143
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- 被引次数: 0
出版历程
- 收稿日期: 2008-12-12
- 刊出日期: 2009-11-25

Magnetic Fabric of Holocene Palaeo-Floods Events in Jianghan Plain

ZHANG Yu-fen^1
,,
LI Zhang-an^{2, 3},
CHEN Liang^{1, 4},
WANG Hui¹

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, ChinaUniversity of Geosciences, Wuhan 430074, China
3.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
South China Sea Marine Engineering Surveying Center, State Oceanic A dministration, Guangzhou 510300, China

摘要

摘要: 在对江汉平原江陵剖面全新世沉积物的沉积环境和年代学分析的基础上, 利用由现代洪水沉积所建立的洪泛沉积物磁组构参数标志, 对江汉平原全新世以来的古洪水事件进行了初步研究.结果表明: (1) 江汉平原全新世以来(有史料记载前), 共有55个特大洪水沉积层(事件). (2) 全新世以来特大洪水(期) 演化可分为两个大的阶段: 第一阶段(9875~3000aBP) 低频期, 该阶段洪水发生频率不高, 且洪水周期比较稳定, 主要以近千年和500~625a周期为主; 第二阶段(3000aBP~现在) 为洪水频发期.洪水发生的周期以300~200a为主, 反映出洪水发生的频率具有加快的趋势.
- 江汉平原 /
- 全新世 /
- 洪水事件 /
- 磁组构参数 /
- 磁化率
Abstract: Based on the study of sedimentary environment and chronology for Holocene sediments from Jiangling profile, Jianghan plain, this paper studies these events on palaeo-flood which took place in Jianghan plain since Holocene, using some marks of magnetic fabric parameters of flood sediment. The main results are as follows: (1) There are 55 large events of flood sediment since Holocene in Jianghan plain (excluding record data in history). (2) According to evolution, these events are divided into the stage of low frequency (9875-3000a BP), which is more stable and has an approximate period of mainly one thousand year and 500-625a, and the stage of high frequency (3000aBP~now), which is more frequent than the former, showing an increasing tendency and has a period of frequent occurrence of mainly 300-200a.
- Jianghan plain /
- Holocene /
- palaeo-flood /
- magnetic fabric parameters /
- magnetic susceptibility

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图 1 研究区交通及剖面位置图

Fig. 1. The transportation and section position of the research area

下载: 全尺寸图片幻灯片

图 2 江陵剖面岩性柱及部分磁组构参数变化曲线

Fig. 2. Lithology column and variation curves of magnetic susceptibility parameters along with depth for Jiangling profile in Hubei Province

下载: 全尺寸图片幻灯片

图 3 江陵剖面古洪水事件(期) 的识别结果

图中以箭头方向代表长轴主方向倾向即长轴的偏角方向, 箭头长短代表长轴主方向倾角大小

Fig. 3. Palaeo-floods events (period) distinguished from sediment of Jiangling section

下载: 全尺寸图片幻灯片

图 4 江汉平原近1万年来洪水频率曲线图

a图为9 875~3 000 aBP时段; b图为3 000~639 aBP时段

Fig. 4. Late 10 000 a floodwater frequency curve map in Jianghan plain

下载: 全尺寸图片幻灯片

表 1 ¹⁴C测年数据

Table 1. Dating data of the radiocarbon age

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