globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.07.011
论文题名:
Cool tropics in the Middle Eocene: Evidence from the Changchang Flora, Hainan Island, China
作者: Spicer R.A.; Herman A.B.; Liao W.; Spicer T.E.V.; Kodrul T.M.; Yang J.; Jin J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 412
起始页码: 1
结束页码: 16
语种: 英语
英文关键词: Climate Leaf Analysis Multivariate Program ; Cool tropics ; Eocene ; Hainan Island ; Plant fossils
英文摘要: The middle Eocene (Lutetian-Bartonian, 48.6-37.2Ma) near-equatorial megafossil flora from swamp and lacustrine facies of the lower Changchang Formation, Hainan Island, South China (19.631463°N, 110.445049°E) is highly diverse (>200 taxa) dominated by an unusual mixture of angiosperms typical of modern temperate, subtropical and tropical evergreen and deciduous forms. It is also rich in palms. Multivariate analysis of the architecture of minimally transported woody dicot leaves reveals a mean annual air temperature (MAT) of ~22±4.7°C with a marked thermal seasonality range of ~21°C. The year-round humid climate lacked any monsoonal signature. The overall climate signal is compatible with the growth characteristics exhibited by fossil wood, but is warmer than the climate signal derived from pollen and spores using Co-existence Analysis. Corrections for possible palaeoelevation of the basin bring the megafossil-derived MAT estimate in line with 54-52Ma sea surface and soil temperatures obtained from the Gulf Coast, USA, (palaeolatitude ~30°N) using multiple geochemical proxies and supports the claim that the low latitude Eocene climate was not uniformly warm. This challenges previous conclusions based on ∂18O analysis of unaltered calcareous microfossils. Our air temperature data also adds to the challenge of understanding heat transport away from the equator to higher latitudes during 'hothouse' climate regimes. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69231
Appears in Collections:过去全球变化的重建

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作者单位: Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Milton Keynes, United Kingdom; Laboratory of Paleofloristics, Geological Institute, RUSn Academy of Sciences, Moscow, Russian Federation; State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China; Key State Laboratory for Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Spicer R.A.,Herman A.B.,Liao W.,et al. Cool tropics in the Middle Eocene: Evidence from the Changchang Flora, Hainan Island, China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,412
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