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Special Session 2: Changing ocean environment: from the sedimentary perspective -- processes and records |
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Modern pollen study in northern Kalimantan Island and its application in paleoclimate reconstruction in the southern South China Sea since 40 ka BP
Wednesday 11th @ 1535-1550
Room 4
Chuanxiu Luo* , South China Sea Institute of Oceanology, Chinese Academy of Sciences
Chixin Chen, Guangzhou Marine Geological Survey
Gang Lin, Shanghai Ocean University
Muhong Chen, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Rong Xiang, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Lanlan Zhang, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Jianguo Liu, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Presenter Email: luocx30@126.com
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| Based on pollen analysis of Gravity piston cores NS07-25 in the northwest slope of Nansha Trough and 92 surface soil pollen samples of northern Kalimantan Island, it is concluded that:
(1) The domain pollen and spore component of the northern Kalimantan is ferns, the secondary component is trees and the last one is herbs. The pollen in the northern of Kalimantan Island from low to high elevation is mangrove, tropical lowland rain forest, tropical low mountain forest, tropical sub-alpine rain forest, alpine rain forest.
(2) In AB transect of northern Kalimantan, from Northeast to Southwest, fern spore occupied 94.47%£¬tree pollen occupied 4.41%. In the highest site of CD transect, from Northwest to Southeast, tree pollen and Polypodiaceae spore have the highest percentage. Tree pollen is low and Microlepia spore is high in the low altitude.
(3) Based on assemblage of pollen and spore of NS07-25 and compared with characteristics of modern pollen in the north of Kalimantan Island, there are:
A zone £¬37.520 ~ 34.371ka BP£ºfern (91.89%). tree pollen (7.74%), herb (only 0.37%), the ratio of number of spores and pollen was 3.75-16.75, so summer monsoon was strong and the climate was warm.
B zone £¬34.371 ~ 32.747ka BP£ºfern (80.92£©£¬tree pollen (17.54%), and the lowest one was still herb (only 1.21%), the ratio of number of spores and pollen was 2.18-9.8.
C zone £¬32.747 ~ 25.537ka BP£ºfern (82.04%)£¬ tree pollen (16.57%), herb (only 1.04%), the ratio of number of spores and pollen was 1.86-41, so summer monsoon was very strong and the climate was warm. It can be deduced that the pollen of NS07-25 core in A, B, C zones mainly came from the major paleo-rivers on the (emerged) glacial Sunda Shelf.
D zone £¬25.537 ~ 13.026ka BP: fern (61.74%), tree pollen (34.47%), herb (only 3.56%), with the lowest pollen concentration. The ratio of number of spores and pollen was 1.05-3.62£¬so summer monsoon was very weak and the climate was cold. It can be deduced that the pollen of NS07-25 core between these periods probably relate to strengthened impact of deep water current.
E zone £¬13.026 ~ 2.62ka BP : fern (83.23%), tree pollen (16.77%), the ratio of number of spores and pollen was 1.8-27, so summer monsoon was strong again and the climate was warm.
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