冲绳海槽末次盛冰期孢粉组合的古环境指示意义

邓韫; 郑卓; SucJ.P.; BerneS.

冲绳海槽末次盛冰期孢粉组合的古环境指示意义

邓韫^{1, 2,},
郑卓¹,
SucJ.P.²,
BerneS.³

1.
中山大学地球科学系, 广东广州 510275
2.
法国里昂第一大学古生物圈与古环境实验室, 里昂 69622
3.
法国海洋开发研究所, 布卢赞 29280

基金项目:

国家自然科学基金重点项目 NSFC40331011

详细信息

作者简介:
邓韫(1979-), 女, 博士研究生, 主要从事海洋孢粉研究及气候定量研究. E-mail: pollen0883@hotmail.com

中图分类号: P53
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出版历程
- 收稿日期: 2005-06-30
- 刊出日期: 2005-09-25

Pollen Assemblages of the Last Glacial Maximum in Okinawa Trough and Their Implication on Paleoenvironment

DENG Yun^{1, 2
,},
ZHENG Zhuo¹,
Suc J.P.²,
Berne S.³

1.
Department of Earth Sciences, Sun Yat-Sen University, Guangzhou 510275, China
2.
Laboratoire Paléoenvironnements et Paléobiosphère, Universite Claude Bernard-Lyon, Villeurbanne 69622, France
3.
IFREMER, Plouzane 29280, France

摘要

摘要: 冲绳海槽西陆坡末次冰期的高沉积速率为高分辨率研究提供了良好的材料, DGKS-9602钻孔通过氧同位素年代对比, 总长931cm的岩心保存了相当于氧同位素阶段1³的沉积记录.孢粉分析的结果表明, OIS1和OIS三阶段松属花粉含量占优势, 平均含量达65%以上, 而OIS2阶段松属百分含量明显降低, 草本植物花粉含量增加, 超过50%.松属与蒿属等草本花粉间的相互消长指示了海平面的升降, 并与氧同位素曲线的变化趋势相似.末次盛冰期中国东部大陆架覆盖的植被以草地为主, 由于冲绳海槽在末次盛冰期时的绝大部分沉积物质与大陆架的剥蚀作用有关, 来自长江中上游山地较远距离带来的物质和山地花粉相对减少.与中国东部尘土花粉结果对比发现, 现代东海表层蒿属与禾本科比值(A/P) 所指示的纬度正好与长江中下游平均纬度相当, 而冲绳海槽末次盛冰期的A/P比值所指示的陆地环境比现代高7个纬度, 证明末次盛冰期植被带南移, 与前人陆地记录的结果相吻合.
- 冲绳海槽 /
- 孢粉分析 /
- 末次盛冰期 /
- 古环境
Abstract: The high rate sedimentation in the west Okinawa Trough provides good materials for high resolution study on palaeoenvironment evolution. In comparing with SPECMAP curve, the core DGKS-9602 was dated OIS 3 to OIS 1 for a total length of 931 cm. Pollen analysis shows that Pinus was predominated during the OIS 1 and OIS 3 with an average percentage 65%, but it decreased at OIS 2, giving place to the herbs which attained more than 50% in average. This result suggests that the alternation of Pinus/herbs indicates the sea level changes and its variation is comparable with oxygen isotopic curve. The vegetation covered on the continental shelf during the LGM was mainly grassland. Most of sediment origin of the study core might be resulted from the erosion of the continental shelf of the East China Sea, that was characterized by the decrease of components from upriver and mountains in the pollen assemblages. In the light of dust pollen distribution pattern in eastern China, the ratio of Artemisia/Poaceae from the surface samples of the East China Sea can be evaluated to the corresponding latitude in the continent that coincided with middle and lower reach of Changjiang River. Whereas, the ratio obtained from the LGM in the core 9602 has an estimative result of 7 latitudes higher than the surface data, which indicates that the vegetation zones shifted southwards with amplitude comparable with previous studies.
- Okinawa Trough /
- pollen analysis /
- last glacial maximum /
- paleoenvironment

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图 1 钻孔DGKS-9602的位置

箭头指示了东海的主要潮流(Milliman et al., 1989); 图中等值线的单位为m

Fig. 1. Location of the core DGKS-9602

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图 2 根据氧同位素曲线和孢粉百分比图式与SPECMAP氧同位素曲线对比确定的钻孔年代

Fig. 2. Chronology model for core DGKS-9602 based on δ¹⁸O analysis polen analysis the compare with the oxygen isotope curve of SPECMAP

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图 3 松属花粉和几种主要草本植物的花粉图式

Fig. 3. Pollen diagram of Pinus and several herbaceous taxa

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图 4 冲绳海槽DGKS-9602孔松属花粉含量与氧同位素曲线对比(灰色区域为松属花粉含量; 曲线为氧同位素值)

Fig. 4. Comparison between the percentage of Pinus and the oxygen isotopic curve of DGKS-9602

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图 5 现代东海表层沉积及冲绳海槽DGKS-9602孔末次盛冰期Artemisia/Poaceae (A/P) 比值的对比

Fig. 5. Comparison of the ratio value of Artemisia/Poaceae (A/P) in the modern surface sediments of the East China Sea and that in the core DGKS-9602 during the LGM

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