巫山黄土微生物四醚膜脂分布特征及其古气候意义

马舒慧; 彭红霞

doi:10.3799/dqkx.2017.610

巫山黄土微生物四醚膜脂分布特征及其古气候意义

doi: 10.3799/dqkx.2017.610

马舒慧^1,,
彭红霞^1,2, ,

1.
中国地质大学公共管理学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074

基金项目:

国家重点基础研究发展计划"973"项目 2011CB710601

国家自然科学基金项目 41877297

详细信息

作者简介:
马舒慧(1991-), 女, 硕士研究生, 自然地理学研究方向

通讯作者:
彭红霞

中图分类号: P66
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-19
- 刊出日期: 2018-11-15

Distribution and Paleoclimate Implication of Microbial Tetraether Lipids in Wushan Loess

Ma Shuhui^1
,,
Peng Hongxia^{1,2
, ,}

1.
School of Public Administration, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: "巫山黄土"是指分布于长江三峡地区的黄土状堆积物，是中国黄土的重要组成部分，具有重要的古气候环境意义.微生物四醚膜脂是反演古气候环境的灵敏指标，为了进一步理解巫山黄土中蕴含的古气候意义，通过测定巫山黄土中微生物醚类化合物（glycerol dialkyl glycerol tetraethers，GDGTs）并分析其分布特征，基于支链GDGTs（bGDGTs）的甲基化指数（methylation index of branched tetraethers，MBT）和环化指数（cyclization ration of branched tetraethers，CBT）重建该地44.4~22.8 ka.BP的古温度年平均气温（mean annual air temperature，MAAT），MAAT与频率磁化率曲线和北大西洋沉积物有孔虫曲线对比，其变化趋势具有一致性，反映了其指标的可靠性.巫山黄土的陆源输入指数（BIT值，bGDGTs vs.crenarchaeol）在0.5~1.0之间，大部分值接近于1.0，但有几个极低值，分析为干旱事件.根据MAAT和BIT指标，巫山地区在冰期气候有剧烈的波动，在36.2±3.6 ka.BP、26.0±2.7 ka.BP、23.7±2.3 ka.BP时相对比较干旱，推测可能分别对应着H4、H3和H2事件，表明该区气候变化响应全球气候变化.
- 黄土 /
- 古气候 /
- 微生物醚类化合物 /
- 年平均气温 /
- 气候变化
Abstract: "Wushan loess", regarded as the southern boundary of Chinese Loess, is distributed in the Three Gorges area in the Yangtze River, which contains rich paleoclimatic information attracting attentions of many scholars in paleoclimate. In order to further reveal its causes and better understand the paleoclimatic significance contained in Wushan loess, the glycerol dialkyl glycerol tetraethers (GDGTs) extracted from Wushan loess section were investigated. Comparing the mean annual air temperature (MAAT) reconstructed based on branched GDGTs (bGDGTs) with frequency-dependent magnetic susceptibility and North Atlantic sediments, it is found that the three curves are analogous in climate evolution patterns. These similarities show that climatic changes in Wushan region respond to global climatic changes. The BIT values range from 0.5-1.0 and most BIT (bGDGTs vs. crenarchaeol) values are close to 1. The low BIT values suggest that it was very dry at 36.2 ka.BP, 30.2 ka.BP and 23.5 ka.BP. Based on MAAT and BIT values, it is found that it was relatively cold when it was very dry. It is proposed that the three periods correspond to H4, H3, H2 climate events, respectively.
- loess /
- paleoclimate /
- glycerol dialkyl glycerol tetraether /
- mean annual air temperature /
- climate change

HTML全文

图 1 GDGTs分子结构图及其质子化后的质核比(m/z)

Fig. 1. The structures of GDGTs and their protonated mass to charge ratios (m/z)

下载: 全尺寸图片幻灯片

图 2 研究区地理位图

地理位置图据百度地图(map.baidu.com)改绘

Fig. 2. Location of research region

下载: 全尺寸图片幻灯片

图 3 样品的部分基峰色谱

Fig. 3. HPLC-APCI/MS base peak chromatograms of two samples in loess

下载: 全尺寸图片幻灯片

图 4 巫山黄土剖面GDGTs各参数的变化及bGDGTs重建的温度与频率磁化率、北大西洋V23-81钻孔沉积物有孔虫曲线对比

据Bond et al.(1992)

Fig. 4. Variations of GDGT proxies in Wushan loess section and comparison of bGDGT-derived MAAT with frequency-dependent magnetic susceptibility and North Atlantic Core V23-81 N. Pachyderma

下载: 全尺寸图片幻灯片

表 1 巫山黄土剖面OSL测年结果

Table 1. OSL dating results of the samples from Wushan loess section

采样深度(m)	估计光释光年龄(ka.BP)
2	26.4±2.3
4	28.2±2.5
6	31.9±2.9
10	44.4±4.2

下载: 导出CSV

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