54~46 ka川東北石筍的氧同位素記錄及其氣候環境意義探討. δ(18)O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution

迟宝泉 Chi, Bao-quan, 周厚云 Zhou, Hou-yun, 赵建新 Zhao, Jian-xin, 韦刚健 Wei, Gang-jian, 关华政 Guang, Hua-zheng, 俸月星 Feng, Yue-xing, 朱照宇 Zhu, Zhao-yu, 周国庆 Zhou, Guo-qing and 闫峻 Yan, Jun (2007) 54~46 ka川東北石筍的氧同位素記錄及其氣候環境意義探討. δ(18)O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution. Diqiu Huaxue, 36 4: 337-343.

Author 迟宝泉 Chi, Bao-quan
周厚云 Zhou, Hou-yun
赵建新 Zhao, Jian-xin
韦刚健 Wei, Gang-jian
关华政 Guang, Hua-zheng
俸月星 Feng, Yue-xing
朱照宇 Zhu, Zhao-yu
周国庆 Zhou, Guo-qing
闫峻 Yan, Jun
Title 54~46 ka川東北石筍的氧同位素記錄及其氣候環境意義探討. δ(18)O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution
Formatted title
54~46 ka川東北石筍的氧同位素記錄及其氣候環境意義探討. δ18O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution
Translated title δ(18)O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution
Language of Title chi
eng
Journal name Diqiu Huaxue
Translated journal name Geochimica
Language of Journal Name chi
eng
ISSN 0379-1726
1000-9426
Publication date 2007-07
Sub-type Article (original research)
Volume 36
Issue 4
Start page 337
End page 343
Total pages 7
Place of publication Beijing, China
Publisher Kexue Chubanshe
Language chi
eng
Subject 04 Earth Sciences
0403 Geology
Formatted abstract
对采集于川东北诺水河溶洞群狮子洞的石笋SI3进行了TIMS-U-Th定年和高精度氧稳定同位素δ18O分析,对其气候环境意义及与东亚夏季风演化之间的关系进行了研究。在54~46ka之间,SI3的δ18O记录相对变化趋势与同样位于东亚季风区的葫芦洞和董哥洞石笋δ18O记录、与极地冰芯GISP2和中东以色列Soreq洞次生碳酸盐沉积的δ18O记录具有很好的可比性,显示了其与东亚夏季风气候演化和全球气候变化的密切关系。但与其他石笋数据的对比显示SI3的δ18O记录明显偏重,可能与SI3生长地点接近洞口的环境有关,SI3发生了18O富集。对SI3的δ18O记录与气候环境密切相关的机制进行了探讨。

TIMS U-Th dating and high-resolution oxygen isotopic composition measurements were conducted on a stalagmite SI3 collected from Shizi cave, Nuoshuihe, northeastern Sichuan, Central China. The stalagmite SI3 was developed between 54-46 ka. Its δ18O record displays a high similarity with those of stalagmites MSL and MSD from Hulu cave, East China and D4 from Dongge cave, Southwest China, respectively. The trend of the δ18O record of SI3 also parallels with those of ice core GISP2 from polar area and of speleothem in Israel. These suggest that the δ18O record of SI3 is closely related with summer monsoon variation in East Asia. However, some evidences seem to suggest that carbonates in SI3 are more 18O enriched than those deposited under oxygen isotopic equilibrium condition. There was probably kinetic fractionation when SI3 was developed. This may be explained by the locus of SI3 that was collected near the entrance of Shizi cave. The possible mechanism between the δ18O record of SI3 and the variation in East Asian summer monsoon was speculated. It is suggested that in the East Asian summer monsoon domain, the δ18O record of some speleothem deposited even under nonequilibrium condition is still a potential proxy for summer monsoon variation.
Keyword Geophysical sciences
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
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Created: Wed, 06 Jan 2010, 14:03:37 EST by Therese Egan on behalf of Centre for Microscopy and Microanalysis