Mid-late Pleistocene palaeovegetation and palaeoclimate changes: Evidence from phytolith and molecular fossil records in vermicular red paleosols in Changxing, Zhejiang
On the basis of field survey, phytolith and molecular fossil analysis of Quaternary red paleosols,red paleosols contain abundant phytolith morphotypes, mostly originating from grasses, and from broad-leaved and gymnosperm trees. Distribution patterns ofphytolith percentage, warmth index (Iw), and ratio of grasses and trees demonstrate that three assemblage zones are sensitive to palaeoclimate changes in response to the Second Last Interglaciation, Second Last Glaciation and Last Interglaciation, respectively. Correlation of phytolith assemblages and three molecular ratios-C15-21/C22e-33 n-alkanes, pristane to phytane (Pr/Ph), and tricyclic terpanes to triterpanes compounds (C23/C30) indicates that palaeovegetation and palaeoclimate are characterized by alternation of glaciation (arid-cool; weak weathering) and interglaciation (warm-humid; intense weathering)whereas red paleosols developed on an alluvial fan. Due to abundant rainfall and high ground water levels,grasses were common on the surface of the alluvial fan during interglaciation. Our study has provided insight into understanding how red paleosols respond to East Asian summer monsoon evolution in southern China.
Y.S.Gu Y.Qiu Z.Y.Wang
Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences,Ministry of State Key Laboratory of Organic Geochemistry, Institute of Geochemistry, CAS, Guangzhou, China
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1485-1489
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）