安徽宣城更新世红土正构烷烃分布特征及其古植被意义

梁斌; 谢树成; 顾延生; 郭建秋; 阮小燕; 易轶; 黄俊华

安徽宣城更新世红土正构烷烃分布特征及其古植被意义

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
西南科技大学城建学院, 四川绵阳 621000

基金项目:

中国地质调查局项目“中国南方红土型第四系的划分与对比” 200113900072

详细信息

作者简介:
梁斌(1967-), 男, 高级工程师, 现在中国地质大学攻读古生物学与地层学专业博士学位, 主要从事地球表层与环境研究

中图分类号: Q91
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出版历程
- 收稿日期: 2004-07-15
- 刊出日期: 2005-03-25

Distribution of n-Alkanes as Indicative of Paleovegetation Change in Pleistocene Red Earth in Xuancheng, Anhui

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
School of City Construction, Southwest University of Science and Technology, Mianyang 621000, China

摘要

摘要: 利用气相色谱-质谱联用仪(GC-MS) 在安徽宣城更新世红土中检测出了微量的分子化石,包括正构烷烃、一元正脂肪酸、一元正脂肪醇以及α-正构脂肪酮等.正构烷烃的分布型式表明其来源于低等菌藻类生物和陆生高等植物,其中高碳数正构烷烃主要以C29为主峰,显示流域中的植被类型以木本植物为主; (C₂₇+C₂₉)/(C₃₁+C₃₃) 比值的变化反映出,在以木本植物占优势的背景下,流域中草本植物的相对比例也发生了多次变化.这一比值在本剖面上表现出多阶段的变化,而且这种变化与岩性、粒度变化密切相关,反映出这些参数可能还蕴涵着古气候信息.
- 分子化石 /
- 红土 /
- 第四纪 /
- 古植被
Abstract: Using GC/MS analysis,a series of molecular fossils,including n-alkanes,n-alkanoic acids,n-alkanols,and n-alkan-2-ones,have been identified from the Pleistocene red earth in Xuancheng,Anhui Province. The n-alkanes are proposed to be of mixed origin,derived from microorganisms and higher plants. The dominance of C₂₉ homologue in the n-alkane distribution in most samples suggests the occurrence of trees in the region studied here. The parameter of (C₂₇+C₂₉)/(C₃₁+C₃₃) n-alkanes,representative of the abundance of grassy plants relative to woody plants,infers a varied grassy density spanning the last 1 Ma. Profiles of this ratio of n-alkanes display a varied trend comparable with the lithology,an indirect inference of paleoclimate which merits further investigation.
- molecular fossil /
- red earth /
- Quaternary /
- paleo-vegetation

HTML全文

图 1 安徽宣城红土剖面正构烷烃的质量色谱

a.4.8 m处的样品; b.7.8 m处的样品

Fig. 1. GC/MS mass chromatograms of n-alkanes in red earth

下载: 全尺寸图片幻灯片

图 2 红土正构烷烃(C₂₇+C₂₉)/(C₃₁+C₃₃) 比值的变化曲线(剖面4 m以上的分层及岩性据乔彦松等, 2003)

Fig. 2. (C₂₇+C₂₉)/(C₃₁+C₃₃) of n-alkanes in red earth

下载: 全尺寸图片幻灯片

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