地学前缘 ›› 2009, Vol. 16 ›› Issue (5): 91-98.

• 论文 • 上一篇    下一篇

青藏高原东缘叠溪海盆地40~30 ka BP高分辨率
快速气候变化记录

张岩 朱利东 杨文光 罗虹 姜琳 何大芳 刘娟   

  1. 成都理工大学 沉积地质研究院
  • 出版日期:2009-09-10 发布日期:2009-09-10
  • 作者简介:朱利东(1965—),男,教授,从事沉积学、第四纪地质学研究与教学工作。Email: zhuld33@163.net
  • 基金资助:

    国家重点基础研究发展计划“973”项目(2006CB701406);同济大学海洋地质国家重点实验室基金项目

High resolution rapid climate change records of lacustrine deposits of Diexi Basin in the eastern margin of QinghaiTibet Plateau, 4030 ka BP.

ZHANG Yan SHU Li-Dong YANG Wen-Guang LUO Gong JIANG Lin HE Da-Fang LIU Juan   

  1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Online:2009-09-10 Published:2009-09-10

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摘要：

对岷江上游地区叠溪古堰塞湖底部沉积物进行AMS14C定年,得到其沉积时间起始时间约为405 ka BP。通过沉积物粒度特征的研究得知,粒度指标可以反映降水量变化进而反映气候干湿变化,此外,粒度均值曲线与格陵兰冰心(GISP2)及南京葫芦洞石笋氧同位素曲线的显著相似性说明,粒度特征对全球性气候变化有响应,可以反映气候的冷暖变化。由此,研究区古气候演变可以划分为3个阶段:阶段Ⅰ(405~334 ka BP)气候冷干,阶段Ⅱ(334~317 ka BP)气候暖湿,阶段Ⅲ(317~311 ka BP)气候较暖湿。而粒度均值曲线与冰心及石笋氧同位素曲线的差异,一方面可能是由于地理位置的差异,另一方面可能与当时太阳辐射变化情况以及季风作用有关。

关键词: 关键词：岷江;叠溪海盆地;堰塞湖;粒度;快速气候变化

Abstract:

The deposition of Diexi ancient barrier lake in the upper reaches of Minjiang River was redated by AMS14C dating, and the result shows it started at 405 ka BP. The grainsize proxy index can reflect the precipitation and thus the climate drywet change. In addition, the obvious comparability between the mean grainsize curve of Diexi Section lacustrine deposits and the δ18O of Greenland ice core and Nanjing Hulu Cave stalagmites shows that the grainsize proxy index could respond to the global climate change, and reflect the chilling and warming. Thus the paleoclimate evolution in the studied area could be divided into three stages: 405334 ka BP, cold and dry; 334317 ka BP, warm and humid; 317311 ka BP, warm and humid, but not as much as the previous stage. The differences between these curves could be interpreted by the variation in location, insolation and monsoon.

Key words: Minjiang River; Diexihai Basin; barrier lake; grainsize; rapid climate change

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