Pollen records from the middle Okinawa Trough and the terrigenous pollen source analysis for 70 ka BP

YANG Shi-xiong; ZHENG Zhuo; WEI Jin-hui; DENG Yun; JEAN-PIERRE Suc; SERGE Berne; LI Jie

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Article Navigation > Haiyang Xuebao > 2011 > 33(3): 103-113

YANG Shi-xiong, ZHENG Zhuo, WEI Jin-hui, DENG Yun, JEAN-PIERRE Suc, SERGE Berne, LI Jie. Pollen records from the middle Okinawa Trough and the terrigenous pollen source analysis for 70 ka BP[J]. Haiyang Xuebao, 2011, 33(3): 103-113.

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Pollen records from the middle Okinawa Trough and the terrigenous pollen source analysis for 70 ka BP

1.
Department of Earth Sciences ,Sun Yat-Sen University, Guangzhou 510275,China
2.
Institut des Sciences de la Terre Paris,Université P. et M Curie-Paris 6, 75005 Paris,France
3.
Université de Perpignan Via Domitia,66860 Perpignan,France

Received Date: 2010-03-01

Abstract

Abstract

Core DGKS-9602 is located in the middle Okinawa Through.The total length of the core is 931 cm and 88 samples were collected from the core.the core age appears to cover marine isotope stages (MIS) 1~4, with the oldest age at upproximatedly 73 ka BP. A pollen analysis from the core indicates that there is a strong relationship between pollen zones and oxgyen isotope stages.The curve of ratio between Pinus and Artemisia (P/A) is concordance with sea-level change of the region. Fossil pollen and modern surface pollen were used to calculate the Euclidean distance by non-similarity analogy and to estimate the pollen source areas, which made it possible for further study on the changes of the terrigenous matter source regions under different sea-level conditions.The results show that during MIS 4 the main source of pollen is the north region of the Okinawa Through, which is dominated by coniferous forest. At the MIS 3 stage, the sea-level is relatively high, and the eastern China (the Middle and Lower Changjiang River) and Kyushu may be the main source areas during this period where the mountain conifers mix with some broad-leaved plants dominated the forests.During MIS 2, the sea level declined dramatically, that is 'coincided with P/A ratio by dropping sharply to <1.The pollen analogue study shows that the pollen grains at last glacial maximum (MIS 2) may be mostly derived from the vicinal continental shelf plains in a short transport distance where the vegetation is predominated by grassland and wetland.Regarding to the Holocene, the result indicates a wide and diverse source areas, including the Changjiang River and the Huanghe River in China, as well as the water current of Kuroshio flowing from tropical regions.
- Okinawa Trough,
- pollen analysis,
- palaeo-vegetation,
- sea-level change,
- pollen sources

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References(59)

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