Abstract title of IPC/IOPC 2012, Tokyo, Japan
First author's full name1, Second author's full name2, Third author's full name3, ...
1
First author's affiliation, country, email address
Second author's affiliation, country
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Third author's affiliation, country
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These directions are written in the format required for the abstract for IPC XIII / IOPC IX 2012,
the joint meeting of the 13th International Palynological Congress and 9th International
Organization of Palaeobotany Conference to be held on August 23-30 2012 at Chuo University
in Tokyo, Japan. We advise you to use this file as the template for your abstract. Also please
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Keywords: palynology, palaeobotany, Chuo University, template, symposium.
(example)
Neogene pollen floras in Japan and palaeoclimatic implication
Takeshi Saito1, Tohru Yamanoi2, Wei-Ming Wang3
1
Meijo University, Japan, tsaito@meijo-u.ac.jp
Yamagata University, Japan
3
Nanjing Institute of Geology and Palaeontology, China
2
The Neogene of Japan is well-dated on the basis of many tephras and marine planktonic
microfossils such as diatom and foraminifer, making it possible to establish detailed Neogene
pollen zones. We here present a revised Neogene pollen zones from Yamanoi (1992). Zone NP-1
(23-18.5 Ma) is characterized by Juglandaceae, Fagus, Quercus (deciduous type),
Ulmus-Zelkova, and Betulaceae, with few broad-leaved evergreen trees. The assemblage
indicates a cool-temperate palaeoclimate. In zone NP-2 (18.5- 13 Ma), Quercus (evergreen type),
Liquidambar and Carya are major components, indicating a warm-temperate palaeoclimate.
Mangrove pollen occurs from sediments around 16 Ma, suggesting a (sub-) tropical
environment. This warm period corresponds to the Mid-Miocene climatic optimum. Zone NP-2
could be subdivided into NP-2a and NP-2b. Zone NP-2b on the upper contains Dacrydium
pollen. The assemblage of zone NP-3 (13 – 6.5 Ma) is similar to zone NP-2 but Fagus and
Taxodiaceae are fairly abundant, indicating a cooler palaeoclimate condition than zone NP-2.
The climatic shift from zones NP-2 to NP-3 seems to represent the Middle Miocene cooling.
Zone NP-4 (6.5 – 5.5 Ma) is characterized by the dominance of Fagus and Taxodiaceae,
whereas Quercus (evergreen type), Carya and Liquidambar decline. This also indicates a
cooling trend and would correspond to the global cooling in the Messinian. The transition from
zones NP-3 to NP-4 might relate to the intensification of the Asian Monsoon from ca. 8 Ma. In
zone NP-5 (5.5 -3 Ma), Cathaya pollen characteristically occurs, and Quercus (evergreen type)
and Liquidambar reflourished, indicating a climatic amelioration in the Early-Middle Pliocene.
The pollen flora of zone NP-6 (3-1.8 Ma) is similar to zone NP-5, but the assemblage exhibits
fluctuations in pollen percentage, suggesting the onset of glacial-interglacial cycles. This might
also relate to the intensifying Asian Monsoon from ca. 3.5 Ma.
Keywords: Mid-Miocene climatic optimum, Middle Miocene cooling, cooling in the Messinian,
climatic amelioration in the Pliocene, Asian Monsoon.