摘要
This paper presents the pollen record from the lower section of ODP1144 (depth 501.3-225.7 m, ca. 1.05-0.36 Ma). Two pollen zones (PA and PB) and eleven pollen subzones are recognized. Within zone PB, the 11 pollen subzones (PB21-11) are defined according to the pine, fern and herb variations, and are equivalent to the marine isotope stages 21-11 (MISs 21-11). The interglacial periods are typified by an increase in pine pollen and fern spores, and a decrease in herbaceous pollen, while the patterning during the glacial periods is just the opposite. During the interglacial periods, pollen assemblages were dominated by pine similar to those of the present day, suggesting that the paleoenvironment of the interglacial periods was similar to that of the present day, whereas the glacial periods are marked by an increase in herbaceous pollen, mainly Gramineae and Cyperaceae, indicating that grassland covered the exposed continental shelf when sea level declined. Increased Artemisia percentages and the highest pine influx during MIS12 may result from a stronger winter monsoon.
This paper presents the pollen record from the lower section of ODP1144 (depth 501.3–225.7 m, ca. 1.05–0.36 Ma). Two pollen zones (PA and PB) and eleven pollen subzones are recognized. Within zone PB, the 11 pollen subzones (PB21-11) are defined according to the pine, fern and herb variations, and are equivalent to the marine isotope stages 21–11 (MISs 21–11). The interglacial periods are typified by an increase in pine pollen and fern spores, and a decrease in herbaceous pollen, while the patterning during the glacial periods is just the opposite. During the interglacial periods, pollen assemblages were dominated by pine similar to those of the present day, suggesting that the paleoenvironment of the interglacial periods was similar to that of the present day, whereas the glacial periods are marked by an increase in herbaceous pollen, mainly Gramineae and Cyperaceae, indicating that grassland covered the exposed continental shelf when sea level declined. IncreasedArtemisia percentages and the highest pine influx during MIS12 may result from a stronger winter monsoon.
作者
HUANG Fei & SUN XiangjunInstitute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China Correspondence should be addressed to Huang Fei
基金
the National Natural Science Foundation of China (Grant No. 49999560)
the State Key Basic Research and Development Plan of China (Grant No. 2000078503).
