| Abstract Detail
Paleobotany wang, jian [1], xiao, liang [1], Li, Xiangchuan [2], wang, Xing [3]. Quantitative reconstruction of Late Miocene paleoclimate changes in Zhejiang based on plant fossils. Zhejiang lying on the southeast of China, is characterized by a humid central subtropical climate with varying seasonality today.The Late Miocene Shengxian Formation of Zhejiang is a set of continental strata with polycyclic eruption of the basalts embedded with the lacustrine sedimentary rocks, which are widely distributed and exposed in the area from Tiantai to Ninghai. A crucial sedimentary horizon comprising mainly fine-grained diatomite mudstones and yielding brown coal and abundant fossil plants can be regionally found at many stratigraphic profiles. The type of fossil preservation is dominated by leaves, with a large proportion of dicotyledons, providing conditions for quantitative reconstruction of paleoclimate.The sedimentary strata of the Shengxian Formation in the area from Tiantai to Ninghai, Zhejiang, can be divided into five layers, JHU0, DLX, JHU1, JHUW, and JHU3 from old to new, respectively. Leaf Margin Analysis method and Climate-Leaf Analysis Multivariate Program were carried out on these leaf fossils to obtain the climatic parameter values of each layer, in order to reconstruct the Late Miocene climatic trends in Zhejiang.The results of the paleoclimate recovery of the five layers show that the Miocene climate of Zhejiang is very similar to the modern climate, with a warm and humid climate. The Mean annual temperature of the five layers is 18.05℃, 16.03℃, 17.96℃, 16.57℃, 15.52℃ from old to new (CLAMP, PhysaAsia 2), which only shows an insignificant downward trend over time. The difference in temperature between the coldest and warmest month (DT) and mean annual precipitation (MAP) in late Miocene is higher than today. This indicates that the monsoon system in the Late Miocene was largely formed, and the monsoon effect gradually increased with time.
1 - School of Earth Sciences and Resources, Chang'an University, Xi'an, 710054, China
2 - Chang'an University, School Of Earth Sciences And Resources, 126 Yanta Road, Xi'an, 61, 710054, China
3 - cehui Road, Beilin District, Xi'an City, Shaanxi Province
Keywords:
The late Miocene
The Shengxian Formation
Plant fossil
Paleoclimate.
Presentation Type: Oral Paper
Number: PB3003
Abstract ID:976
Candidate for Awards:Maynard F. Moseley Award |
