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

Volume 30 Issue 2

Mar. 2005

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Article Navigation > Earth Science > 2005 > 30(2): 129-132

LIANG Bin, XIE Shu-cheng, GU Yan-sheng, GUO Jian-qiu, RUAN Xiao-yan, YI Yi, HUANG Jun-hua, 2005. Distribution of n-Alkanes as Indicative of Paleovegetation Change in Pleistocene Red Earth in Xuancheng, Anhui. Earth Science, 30(2): 129-132.

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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

Received Date: 2004-07-15
Publish Date: 2005-03-25

Abstract

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

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

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