鹤庆盆地湖相岩心磁化率记录及其古环境意义

徐新文; 强小科; 安芷生; 李续斌; 李鹏; 孙玉芳

鹤庆盆地湖相岩心磁化率记录及其古环境意义

徐新文^{1, 2,},
强小科¹,
安芷生¹,
李续斌^{1, 2},
李鹏^{1, 2},
孙玉芳^{1, 2}

1.
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, 陕西西安 710075
2.
中国科学院研究生院, 北京 100049

基金项目:

国家自然科学基金项目 40572109

国家重点基础研究发展规划项目 2004CB720205

黄土与第四纪地质国家重点实验室自主部署项目 LQ0701

国家自然科学基金创新研究群体科学基金 40121303

详细信息

作者简介:
徐新文(1981-), 男, 硕士研究生, 第四纪地质学与全球环境变化专业, E-mail:xuxinwen@ieecas.cn

中图分类号: P66
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- 被引次数: 0
出版历程
- 收稿日期: 2009-01-04
- 刊出日期: 2010-12-01

MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

XU Xinwen^{1, 2
,},
QIANG Xiaoke¹,
AN Zhisheng¹,
LI Xubin^{1, 2},
LI Peng^{1, 2},
SUN Yufang^{1, 2}

1.
State Key Laboratory and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Science, Xi'an 710075, China
2.
Graduated University of Chinese Academy of Sciense, Beijing 100049, China

摘要

摘要: 鹤庆盆地位于受印度季风影响的中国西南地区, 沉积连续, 厚度大, 是古环境研究的理想场所。本文主要通过对鹤庆湖相岩心磁化率记录的分析研究, 并结合碳酸盐、烧失量和粒度特征对古环境变化的响应机理, 探讨了沉积物中磁化率的古环境指示意义。本研究发现, 磁化率与碳酸盐和烧失量具有显著的相反变化; 而与粒度的关系较为复杂。磁化率与指示粗颗粒变化的中值粒径在含砂(砾)层具有较好的正相关关系; 与指示细颗粒变化的 < 4μm颗粒的相对含量, 在湖相粘土沉积中具有较为明显的正相关关系, 表明湖相沉积物中的亚铁磁性矿物主要来自于外源带入的粘土粒级碎屑物中。通过分析磁化率对古环境变化的响应机制, 并结合碳酸盐含量、烧失量和粒度变化特征, 本研究认为鹤庆盆地湖相岩心的磁化率记录可以用来反映水动力对物源区地表的侵蚀强度和搬运状况, 与流域内植被覆盖和降雨量密切相关。在干旱的冰期, 植被覆盖度较低, 地表侵蚀加剧, 带入湖泊的粘土粒级碎屑含量增加, 磁化率增高; 在湿润的间冰期, 植被覆盖度较高, 地表侵蚀减弱, 粘土粒级碎屑物的带入量减少, 磁化率降低。
- 鹤庆盆地 /
- 磁化率 /
- 古环境意义
Abstract: Located in southwestern China, the Heqing Basin received continuous lacustrine sediments of great thickness, which could be an excellent continental record for Indian monsoon. In this study, we choose the lake sediments from Heqing drill core to analyze the paleoenvironmental significance of magnetic susceptibility. By analyzing the magnetic susceptibility in combination with the response of carbonate content, Loss on Ignition (LOI), and grain size to paleoenvironmental changes, we get some useful information:1) magnetic susceptibility increase when carbonate and LOI decrease; 2) magnetic susceptibility increase with increase of < 4μm grains in lacustrine clayey sediments, and with increase of middle grain size in sections containing sands and pebbles. Based on comparison between these proxies, we conclude that magnetic minerals got into the lake mainly together with clay-sized terrestrial detritus, and magnetic susceptibility is related to the vegetation cover and rainfall in the watershed and therefore could be considered to be a good indicator for monsoon-induced erosion around lake catchments. In the warm-humid interglacial periods, due to well-developed vegetation cover in the catchment area, erosion is relatively weak and clay-sized terrestrial detritus transported into the lake are reduced, so sediments have low concentration of magnetic minerals and low magnetic susceptibility. In the cold-arid glacial periods, however, because of the vegetation development is restricted, erosion is relatively strong and more clay-sized sediments are transported into the lake, the sediments have high concentration of magnetic minerals and high magnetic susceptibility.
- Heqing basin /
- magnetic susceptibility /
- paleoenvironmental implications

HTML全文

图 1 鹤庆盆地地理位置和构造简图

Figure 1. Sketch map of tectonic setting of Heqing Basin

下载: 全尺寸图片幻灯片

图 2 鹤庆盆地湖相岩心磁化率(MS), 碳酸盐, 烧失量(LOI), 中值粒径, < 4μm和> 32μm颗粒的相对含量随深度的变化情况。出于作图的匀称, 其中磁化率采用对数坐标

Figure 2. Changes with depth of Magnetic Susceptibility, Carbonate Content, LOI, Middle Grain, Contents of < 4μm and > 32μm in Heqing Core lacustrine sediments

下载: 全尺寸图片幻灯片

表 1 鹤庆盆地湖相岩心中砾石段的碳酸盐含量

Table 1. Carbonate Content of the Gravels layer in Heqing Core lacustrine

表 2 鹤庆湖相岩心中磁化率(MS)与碳酸盐, 中值粒径, < 4μm和> 32μm颗粒的相对含量之间相关系数随深度的变化情况

Table 2. The correlation between Magnetic Susceptibility (MS) and Carbonate Content, LOI, Middle Grain, Contents of < 4μm m and > 32μm Grains in Heqing Core lacustrine sediments

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